Blob Blame History Raw
From 1d7f9d53c5be6588a7a6c34e4c623b2a8f6fff19 Mon Sep 17 00:00:00 2001
From: Rich Megginson <rmeggins@redhat.com>
Date: Wed, 3 Mar 2021 07:55:20 -0700
Subject: [PATCH] resolve ansible-test issues

This fixes many formatting issues as well to make black, flake8,
pylint, yamllint, and ansible-lint happier.

(cherry picked from commit bb2a1af5f63d00c3ff178f3b44696189d9adf542)
---
 .github/workflows/tox.yml                     |   4 +-
 .sanity-ansible-ignore-2.9.txt                |  13 +
 library/blivet.py                             | 968 +++++++++++-------
 library/blockdev_info.py                      |  45 +-
 library/bsize.py                              |  56 +-
 library/find_unused_disk.py                   | 101 +-
 library/lvm_gensym.py                         | 119 ++-
 library/resolve_blockdev.py                   |  71 +-
 module_utils/storage_lsr/size.py              |  86 +-
 tests/setup_module_utils.sh                   |  41 -
 tests/test-verify-volume-device.yml           |   4 +-
 tests/test-verify-volume-md.yml               |   2 +-
 tests/test.yml                                |   2 +-
 tests/tests_create_lv_size_equal_to_vg.yml    |  28 +-
 ...ts_create_partition_volume_then_remove.yml |   4 +-
 tests/tests_existing_lvm_pool.yml             |  12 +-
 tests/tests_lvm_auto_size_cap.yml             |  42 +-
 tests/tests_lvm_one_disk_one_volume.yml       |  46 +-
 tests/tests_misc.yml                          |   2 +-
 tests/tests_null_raid_pool.yml                |  14 +-
 tests/tests_resize.yml                        |  86 +-
 tests/unit/bsize_test.py                      |   5 +
 tests/unit/gensym_test.py                     | 103 +-
 tests/unit/resolve_blockdev_test.py           |  74 +-
 tests/unit/test_unused_disk.py                |  73 +-
 tox.ini                                       |   6 -
 26 files changed, 1177 insertions(+), 830 deletions(-)
 create mode 100644 .sanity-ansible-ignore-2.9.txt
 delete mode 100755 tests/setup_module_utils.sh

diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index eceb71f..ec3ec9f 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -3,7 +3,7 @@ name: tox
 on:  # yamllint disable-line rule:truthy
   - pull_request
 env:
-  TOX_LSR: "git+https://github.com/linux-system-roles/tox-lsr@2.2.0"
+  TOX_LSR: "git+https://github.com/linux-system-roles/tox-lsr@2.3.0"
   LSR_ANSIBLES: 'ansible==2.8.* ansible==2.9.*'
   LSR_MSCENARIOS: default
   # LSR_EXTRA_PACKAGES: libdbus-1-dev
@@ -36,7 +36,7 @@ jobs:
           toxenvs="py${toxpyver}"
           case "$toxpyver" in
           27) toxenvs="${toxenvs},coveralls,flake8,pylint,custom" ;;
-          36) toxenvs="${toxenvs},coveralls,black,yamllint,ansible-lint,shellcheck,custom,collection" ;;
+          36) toxenvs="${toxenvs},coveralls,black,yamllint,ansible-lint,shellcheck,custom,collection,ansible-test" ;;
           37) toxenvs="${toxenvs},coveralls,custom" ;;
           38) toxenvs="${toxenvs},coveralls,custom" ;;
           esac
diff --git a/.sanity-ansible-ignore-2.9.txt b/.sanity-ansible-ignore-2.9.txt
new file mode 100644
index 0000000..bf700c6
--- /dev/null
+++ b/.sanity-ansible-ignore-2.9.txt
@@ -0,0 +1,13 @@
+plugins/modules/blivet.py import-2.7!skip
+plugins/modules/blivet.py import-3.5!skip
+plugins/modules/blivet.py import-3.6!skip
+plugins/modules/blivet.py import-3.7!skip
+plugins/modules/blivet.py import-3.8!skip
+tests/storage/unit/gensym_test.py shebang!skip
+plugins/modules/blivet.py validate-modules:import-error
+plugins/modules/blivet.py validate-modules:missing-gplv3-license
+plugins/modules/blockdev_info.py validate-modules:missing-gplv3-license
+plugins/modules/bsize.py validate-modules:missing-gplv3-license
+plugins/modules/find_unused_disk.py validate-modules:missing-gplv3-license
+plugins/modules/lvm_gensym.py validate-modules:missing-gplv3-license
+plugins/modules/resolve_blockdev.py validate-modules:missing-gplv3-license
diff --git a/library/blivet.py b/library/blivet.py
index 946b640..0e0b30c 100644
--- a/library/blivet.py
+++ b/library/blivet.py
@@ -1,12 +1,16 @@
 #!/usr/bin/python
 
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 ANSIBLE_METADATA = {
-    'metadata_version': '1.1',
-    'status': ['preview'],
-    'supported_by': 'community'
+    "metadata_version": "1.1",
+    "status": ["preview"],
+    "supported_by": "community",
 }
 
-DOCUMENTATION = '''
+DOCUMENTATION = """
 ---
 module: blivet
 
@@ -15,6 +19,7 @@ short_description: Module for management of linux block device stacks
 version_added: "2.5"
 
 description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
     - "Module configures storage pools and volumes to match the state specified
        in input parameters. It does not do any management of /etc/fstab entries."
 
@@ -30,7 +35,8 @@ options:
             - boolean indicating whether to create partitions on disks for pool backing devices
     disklabel_type:
         description:
-            - disklabel type string (eg: 'gpt') to use, overriding the built-in logic in blivet
+            - |
+              disklabel type string (eg: 'gpt') to use, overriding the built-in logic in blivet
     safe_mode:
         description:
             - boolean indicating that we should fail rather than implicitly/automatically
@@ -41,10 +47,10 @@ options:
               when creating a disk volume (that is, a whole disk filesystem)
 
 author:
-    - David Lehman (dlehman@redhat.com)
-'''
+    - David Lehman (@dwlehman)
+"""
 
-EXAMPLES = '''
+EXAMPLES = """
 
 - name: Manage devices
   blivet:
@@ -64,28 +70,40 @@ EXAMPLES = '''
           mount_point: /whole_disk1
           fs_type: ext4
           mount_options: journal_checksum,async,noexec
-'''
+"""
 
-RETURN = '''
+RETURN = """
 actions:
     description: list of dicts describing actions taken
-    type: list of dict
+    returned: success
+    type: list
+    elements: dict
 leaves:
     description: list of paths to leaf devices
-    type: list of str
+    returned: success
+    type: list
+    elements: dict
 mounts:
     description: list of dicts describing mounts to set up
-    type: list of dict
+    returned: success
+    type: list
+    elements: dict
 crypts:
     description: list of dicts describing crypttab entries to set up
-    type: list of dict
+    returned: success
+    type: list
+    elements: dict
 pools:
     description: list of dicts describing the pools w/ device path for each volume
-    type: list of dict
+    returned: success
+    type: list
+    elements: dict
 volumes:
     description: list of dicts describing the volumes w/ device path for each
-    type: list of dict
-'''
+    returned: success
+    type: list
+    elements: dict
+"""
 
 import logging
 import os
@@ -106,7 +124,8 @@ try:
     from blivet3.size import Size
     from blivet3.udev import trigger
     from blivet3.util import set_up_logging
-    BLIVET_PACKAGE = 'blivet3'
+
+    BLIVET_PACKAGE = "blivet3"
 except ImportError:
     LIB_IMP_ERR3 = traceback.format_exc()
     try:
@@ -119,7 +138,8 @@ except ImportError:
         from blivet.size import Size
         from blivet.udev import trigger
         from blivet.util import set_up_logging
-        BLIVET_PACKAGE = 'blivet'
+
+        BLIVET_PACKAGE = "blivet"
     except ImportError:
         LIB_IMP_ERR = traceback.format_exc()
 
@@ -135,23 +155,23 @@ MAX_TRIM_PERCENT = 2
 
 use_partitions = None  # create partitions on pool backing device disks?
 disklabel_type = None  # user-specified disklabel type
-safe_mode = None       # do not remove any existing devices or formatting
+safe_mode = None  # do not remove any existing devices or formatting
 pool_defaults = dict()
 volume_defaults = dict()
 
 
 def find_duplicate_names(dicts):
-    """ Return a list of names that appear more than once in a list of dicts.
+    """Return a list of names that appear more than once in a list of dicts.
 
-        Items can be a list of any dicts with a 'name' key; that's all we're
-        looking at. """
+    Items can be a list of any dicts with a 'name' key; that's all we're
+    looking at."""
     names = list()
     duplicates = list()
     for item in dicts:
-        if item['name'] in names and item['name'] not in duplicates:
-            duplicates.append(item['name'])
+        if item["name"] in names and item["name"] not in duplicates:
+            duplicates.append(item["name"])
         else:
-            names.append(item['name'])
+            names.append(item["name"])
 
     return duplicates
 
@@ -177,41 +197,54 @@ class BlivetBase(object):
         global safe_mode
         ret = device
         # Make sure to handle adjusting both existing stacks and future stacks.
-        if device == device.raw_device and self._spec_dict['encryption']:
+        if device == device.raw_device and self._spec_dict["encryption"]:
             # add luks
             luks_name = "luks-%s" % device._name
-            if safe_mode and (device.original_format.type is not None or
-                              device.original_format.name != get_format(None).name):
-                raise BlivetAnsibleError("cannot remove existing formatting on device '%s' in safe mode due to adding encryption" %
-                                         device._name)
+            if safe_mode and (
+                device.original_format.type is not None
+                or device.original_format.name != get_format(None).name
+            ):
+                raise BlivetAnsibleError(
+                    "cannot remove existing formatting on device '%s' in safe mode due to adding encryption"
+                    % device._name
+                )
             if not device.format.exists:
                 fmt = device.format
             else:
                 fmt = get_format(None)
 
-            self._blivet.format_device(device,
-                                       get_format("luks",
-                                                  name=luks_name,
-                                                  cipher=self._spec_dict.get('encryption_cipher'),
-                                                  key_size=self._spec_dict.get('encryption_key_size'),
-                                                  luks_version=self._spec_dict.get('encryption_luks_version'),
-                                                  passphrase=self._spec_dict.get('encryption_password') or None,
-                                                  key_file=self._spec_dict.get('encryption_key') or None))
+            self._blivet.format_device(
+                device,
+                get_format(
+                    "luks",
+                    name=luks_name,
+                    cipher=self._spec_dict.get("encryption_cipher"),
+                    key_size=self._spec_dict.get("encryption_key_size"),
+                    luks_version=self._spec_dict.get("encryption_luks_version"),
+                    passphrase=self._spec_dict.get("encryption_password") or None,
+                    key_file=self._spec_dict.get("encryption_key") or None,
+                ),
+            )
 
             if not device.format.has_key:
-                raise BlivetAnsibleError("encrypted %s '%s' missing key/password" % (self._type, self._spec_dict['name']))
+                raise BlivetAnsibleError(
+                    "encrypted %s '%s' missing key/password"
+                    % (self._type, self._spec_dict["name"])
+                )
 
-            luks_device = devices.LUKSDevice(luks_name,
-                                             fmt=fmt,
-                                             parents=[device])
+            luks_device = devices.LUKSDevice(luks_name, fmt=fmt, parents=[device])
             self._blivet.create_device(luks_device)
             ret = luks_device
-        elif device != device.raw_device and not self._spec_dict['encryption']:
+        elif device != device.raw_device and not self._spec_dict["encryption"]:
             # remove luks
-            if safe_mode and (device.original_format.type is not None or
-                              device.original_format.name != get_format(None).name):
-                raise BlivetAnsibleError("cannot remove existing formatting on device '%s' in safe mode due to encryption removal" %
-                                         device._name)
+            if safe_mode and (
+                device.original_format.type is not None
+                or device.original_format.name != get_format(None).name
+            ):
+                raise BlivetAnsibleError(
+                    "cannot remove existing formatting on device '%s' in safe mode due to encryption removal"
+                    % device._name
+                )
             if not device.format.exists:
                 fmt = device.format
             else:
@@ -240,12 +273,21 @@ class BlivetBase(object):
         requested_spares = self._spec_dict.get("raid_spare_count")
 
         if requested_actives is not None and requested_spares is not None:
-            if (requested_actives + requested_spares != len(members) or
-                    requested_actives < 0 or requested_spares < 0):
-                raise BlivetAnsibleError("failed to set up '%s': cannot create RAID "
-                                        "with %s members (%s active and %s spare)"
-                                        % (self._spec_dict["name"], len(members),
-                                            requested_actives, requested_spares))
+            if (
+                requested_actives + requested_spares != len(members)
+                or requested_actives < 0
+                or requested_spares < 0
+            ):
+                raise BlivetAnsibleError(
+                    "failed to set up '%s': cannot create RAID "
+                    "with %s members (%s active and %s spare)"
+                    % (
+                        self._spec_dict["name"],
+                        len(members),
+                        requested_actives,
+                        requested_spares,
+                    )
+                )
 
         if requested_actives is not None:
             active_count = requested_actives
@@ -264,16 +306,20 @@ class BlivetBase(object):
             raise BlivetAnsibleError("chunk size must be multiple of 4 KiB")
 
         try:
-            raid_array = self._blivet.new_mdarray(name=raid_name,
-                                                  level=self._spec_dict["raid_level"],
-                                                  member_devices=active_count,
-                                                  total_devices=len(members),
-                                                  parents=members,
-                                                  chunk_size=chunk_size,
-                                                  metadata_version=self._spec_dict.get("raid_metadata_version"),
-                                                  fmt=self._get_format())
+            raid_array = self._blivet.new_mdarray(
+                name=raid_name,
+                level=self._spec_dict["raid_level"],
+                member_devices=active_count,
+                total_devices=len(members),
+                parents=members,
+                chunk_size=chunk_size,
+                metadata_version=self._spec_dict.get("raid_metadata_version"),
+                fmt=self._get_format(),
+            )
         except ValueError as e:
-            raise BlivetAnsibleError("cannot create RAID '%s': %s" % (raid_name, str(e)))
+            raise BlivetAnsibleError(
+                "cannot create RAID '%s': %s" % (raid_name, str(e))
+            )
 
         return raid_array
 
@@ -298,17 +344,18 @@ class BlivetVolume(BlivetBase):
         if self.__class__.blivet_device_class is not None:
             packages.extend(self.__class__.blivet_device_class._packages)
 
-        fmt = get_format(self._volume.get('fs_type'))
+        fmt = get_format(self._volume.get("fs_type"))
         packages.extend(fmt.packages)
-        if self._volume.get('encryption'):
-            packages.extend(get_format('luks').packages)
+        if self._volume.get("encryption"):
+            packages.extend(get_format("luks").packages)
         return packages
 
     @property
     def ultimately_present(self):
         """ Should this volume be present when we are finished? """
-        return (self._volume.get('state', 'present') == 'present' and
-                (self._blivet_pool is None or self._blivet_pool.ultimately_present))
+        return self._volume.get("state", "present") == "present" and (
+            self._blivet_pool is None or self._blivet_pool.ultimately_present
+        )
 
     def _type_check(self):  # pylint: disable=no-self-use
         """ Is self._device of the correct type? """
@@ -316,7 +363,7 @@ class BlivetVolume(BlivetBase):
 
     def _get_device_id(self):
         """ Return an identifier by which to try looking the volume up. """
-        return self._volume['name']
+        return self._volume["name"]
 
     def _look_up_device(self):
         """ Try to look up this volume in blivet's device tree. """
@@ -331,14 +378,14 @@ class BlivetVolume(BlivetBase):
         if device is None:
             return
 
-        if device.format.type == 'luks':
+        if device.format.type == "luks":
             # XXX If we have no key we will always re-encrypt.
-            device.format._key_file = self._volume.get('encryption_key')
-            device.format.passphrase = self._volume.get('encryption_password')
+            device.format._key_file = self._volume.get("encryption_key")
+            device.format.passphrase = self._volume.get("encryption_password")
 
             # set up the original format as well since it'll get used for processing
-            device.original_format._key_file = self._volume.get('encryption_key')
-            device.original_format.passphrase = self._volume.get('encryption_password')
+            device.original_format._key_file = self._volume.get("encryption_key")
+            device.original_format.passphrase = self._volume.get("encryption_password")
             if device.isleaf:
                 self._blivet.populate()
 
@@ -361,26 +408,31 @@ class BlivetVolume(BlivetBase):
         elif encrypted:
             luks_fmt = self._device.format
 
-        if param_name == 'size':
-            self._volume['size'] = int(self._device.size.convert_to())
-        elif param_name == 'fs_type' and (self._device.format.type or self._device.format.name != get_format(None).name):
-            self._volume['fs_type'] = self._device.format.type
-        elif param_name == 'fs_label':
-            self._volume['fs_label'] = getattr(self._device.format, 'label', "") or ""
-        elif param_name == 'mount_point':
-            self._volume['mount_point'] = getattr(self._device.format, 'mountpoint', None)
-        elif param_name == 'disks':
-            self._volume['disks'] = [d.name for d in self._device.disks]
-        elif param_name == 'encryption':
-            self._volume['encryption'] = encrypted
-        elif param_name == 'encryption_key_size' and encrypted:
-            self._volume['encryption_key_size'] = luks_fmt.key_size
-        elif param_name == 'encryption_key_file' and encrypted:
-            self._volume['encryption_key_file'] = luks_fmt.key_file
-        elif param_name == 'encryption_cipher' and encrypted:
-            self._volume['encryption_cipher'] = luks_fmt.cipher
-        elif param_name == 'encryption_luks_version' and encrypted:
-            self._volume['encryption_luks_version'] = luks_fmt.luks_version
+        if param_name == "size":
+            self._volume["size"] = int(self._device.size.convert_to())
+        elif param_name == "fs_type" and (
+            self._device.format.type
+            or self._device.format.name != get_format(None).name
+        ):
+            self._volume["fs_type"] = self._device.format.type
+        elif param_name == "fs_label":
+            self._volume["fs_label"] = getattr(self._device.format, "label", "") or ""
+        elif param_name == "mount_point":
+            self._volume["mount_point"] = getattr(
+                self._device.format, "mountpoint", None
+            )
+        elif param_name == "disks":
+            self._volume["disks"] = [d.name for d in self._device.disks]
+        elif param_name == "encryption":
+            self._volume["encryption"] = encrypted
+        elif param_name == "encryption_key_size" and encrypted:
+            self._volume["encryption_key_size"] = luks_fmt.key_size
+        elif param_name == "encryption_key_file" and encrypted:
+            self._volume["encryption_key_file"] = luks_fmt.key_file
+        elif param_name == "encryption_cipher" and encrypted:
+            self._volume["encryption_cipher"] = luks_fmt.cipher
+        elif param_name == "encryption_luks_version" and encrypted:
+            self._volume["encryption_luks_version"] = luks_fmt.luks_version
         else:
             return False
 
@@ -392,7 +444,7 @@ class BlivetVolume(BlivetBase):
             if name in self._volume:
                 continue
 
-            default = None if default in ('none', 'None', 'null') else default
+            default = None if default in ("none", "None", "null") else default
 
             if self._device:
                 # Apply values from the device if it already exists.
@@ -403,12 +455,17 @@ class BlivetVolume(BlivetBase):
 
     def _get_format(self):
         """ Return a blivet.formats.DeviceFormat instance for this volume. """
-        fmt = get_format(self._volume['fs_type'],
-                         mountpoint=self._volume.get('mount_point'),
-                         label=self._volume['fs_label'],
-                         create_options=self._volume['fs_create_options'])
+        fmt = get_format(
+            self._volume["fs_type"],
+            mountpoint=self._volume.get("mount_point"),
+            label=self._volume["fs_label"],
+            create_options=self._volume["fs_create_options"],
+        )
         if not fmt.supported or not fmt.formattable:
-            raise BlivetAnsibleError("required tools for file system '%s' are missing" % self._volume['fs_type'])
+            raise BlivetAnsibleError(
+                "required tools for file system '%s' are missing"
+                % self._volume["fs_type"]
+            )
 
         return fmt
 
@@ -422,9 +479,9 @@ class BlivetVolume(BlivetBase):
             return
 
         # save device identifiers for use by the role
-        self._volume['_device'] = self._device.path
-        self._volume['_raw_device'] = self._device.raw_device.path
-        self._volume['_mount_id'] = self._device.fstab_spec
+        self._volume["_device"] = self._device.path
+        self._volume["_raw_device"] = self._device.raw_device.path
+        self._volume["_mount_id"] = self._device.fstab_spec
 
         # schedule removal of this device and any descendant devices
         self._blivet.devicetree.recursive_remove(self._device.raw_device)
@@ -435,9 +492,12 @@ class BlivetVolume(BlivetBase):
     def _resize(self):
         """ Schedule actions as needed to ensure the device has the desired size. """
         try:
-            size = Size(self._volume['size'])
+            size = Size(self._volume["size"])
         except Exception:
-            raise BlivetAnsibleError("invalid size specification for volume '%s': '%s'" % (self._volume['name'], self._volume['size']))
+            raise BlivetAnsibleError(
+                "invalid size specification for volume '%s': '%s'"
+                % (self._volume["name"], self._volume["size"])
+            )
 
         if size and self._device.size != size:
             try:
@@ -448,28 +508,44 @@ class BlivetVolume(BlivetBase):
             if not self._device.resizable:
                 return
 
-            trim_percent = (1.0 - float(self._device.max_size / size))*100
-            log.debug("resize: size=%s->%s ; trim=%s", self._device.size, size, trim_percent)
+            trim_percent = (1.0 - float(self._device.max_size / size)) * 100
+            log.debug(
+                "resize: size=%s->%s ; trim=%s", self._device.size, size, trim_percent
+            )
             if size > self._device.max_size and trim_percent <= MAX_TRIM_PERCENT:
-                log.info("adjusting %s resize target from %s to %s to fit in free space",
-                         self._volume['name'],
-                         size,
-                         self._device.max_size)
+                log.info(
+                    "adjusting %s resize target from %s to %s to fit in free space",
+                    self._volume["name"],
+                    size,
+                    self._device.max_size,
+                )
                 size = self._device.max_size
                 if size == self._device.size:
                     return
 
             if not self._device.min_size <= size <= self._device.max_size:
-                raise BlivetAnsibleError("volume '%s' cannot be resized to '%s'" % (self._volume['name'], size))
+                raise BlivetAnsibleError(
+                    "volume '%s' cannot be resized to '%s'"
+                    % (self._volume["name"], size)
+                )
 
             try:
                 self._blivet.resize_device(self._device, size)
             except ValueError as e:
-                raise BlivetAnsibleError("volume '%s' cannot be resized from %s to %s: %s" % (self._device.name,
-                                                                                              self._device.size,
-                                                                                              size, str(e)))
-        elif size and self._device.exists and self._device.size != size and not self._device.resizable:
-            raise BlivetAnsibleError("volume '%s' cannot be resized from %s to %s" % (self._device.name, self._device.size, size))
+                raise BlivetAnsibleError(
+                    "volume '%s' cannot be resized from %s to %s: %s"
+                    % (self._device.name, self._device.size, size, str(e))
+                )
+        elif (
+            size
+            and self._device.exists
+            and self._device.size != size
+            and not self._device.resizable
+        ):
+            raise BlivetAnsibleError(
+                "volume '%s' cannot be resized from %s to %s"
+                % (self._device.name, self._device.size, size)
+            )
 
     def _reformat(self):
         """ Schedule actions as needed to ensure the volume is formatted as specified. """
@@ -477,10 +553,18 @@ class BlivetVolume(BlivetBase):
         if self._device.format.type == fmt.type:
             return
 
-        if safe_mode and (self._device.format.type is not None or self._device.format.name != get_format(None).name):
-            raise BlivetAnsibleError("cannot remove existing formatting on volume '%s' in safe mode" % self._volume['name'])
-
-        if self._device.format.status and (self._device.format.mountable or self._device.format.type == "swap"):
+        if safe_mode and (
+            self._device.format.type is not None
+            or self._device.format.name != get_format(None).name
+        ):
+            raise BlivetAnsibleError(
+                "cannot remove existing formatting on volume '%s' in safe mode"
+                % self._volume["name"]
+            )
+
+        if self._device.format.status and (
+            self._device.format.mountable or self._device.format.type == "swap"
+        ):
             self._device.format.teardown()
         if not self._device.isleaf:
             self._blivet.devicetree.recursive_remove(self._device, remove_device=False)
@@ -503,7 +587,9 @@ class BlivetVolume(BlivetBase):
 
         # at this point we should have a blivet.devices.StorageDevice instance
         if self._device is None:
-            raise BlivetAnsibleError("failed to look up or create device '%s'" % self._volume['name'])
+            raise BlivetAnsibleError(
+                "failed to look up or create device '%s'" % self._volume["name"]
+            )
 
         self._manage_encryption()
 
@@ -511,24 +597,31 @@ class BlivetVolume(BlivetBase):
         if self._device.raw_device.exists:
             self._reformat()
 
-        if self.ultimately_present and self._volume['mount_point'] and not self._device.format.mountable:
-            raise BlivetAnsibleError("volume '%s' has a mount point but no mountable file system" % self._volume['name'])
+        if (
+            self.ultimately_present
+            and self._volume["mount_point"]
+            and not self._device.format.mountable
+        ):
+            raise BlivetAnsibleError(
+                "volume '%s' has a mount point but no mountable file system"
+                % self._volume["name"]
+            )
 
         # schedule resize if appropriate
-        if self._device.raw_device.exists and self._volume['size']:
+        if self._device.raw_device.exists and self._volume["size"]:
             self._resize()
 
         # save device identifiers for use by the role
-        self._volume['_device'] = self._device.path
-        self._volume['_raw_device'] = self._device.raw_device.path
-        self._volume['_mount_id'] = self._device.fstab_spec
+        self._volume["_device"] = self._device.path
+        self._volume["_raw_device"] = self._device.raw_device.path
+        self._volume["_mount_id"] = self._device.fstab_spec
 
 
 class BlivetDiskVolume(BlivetVolume):
     blivet_device_class = devices.DiskDevice
 
     def _get_device_id(self):
-        return self._volume['disks'][0]
+        return self._volume["disks"][0]
 
     def _type_check(self):
         return self._device.raw_device.is_disk
@@ -536,7 +629,7 @@ class BlivetDiskVolume(BlivetVolume):
     def _get_format(self):
         fmt = super(BlivetDiskVolume, self)._get_format()
         # pass -F to mke2fs on whole disks in RHEL7
-        mkfs_options = diskvolume_mkfs_option_map.get(self._volume['fs_type'])
+        mkfs_options = diskvolume_mkfs_option_map.get(self._volume["fs_type"])
         if mkfs_options:
             if fmt.create_options:
                 fmt.create_options += " "
@@ -552,23 +645,31 @@ class BlivetDiskVolume(BlivetVolume):
     def _look_up_device(self):
         super(BlivetDiskVolume, self)._look_up_device()
         if not self._get_device_id():
-            raise BlivetAnsibleError("no disks specified for volume '%s'" % self._volume['name'])
-        elif not isinstance(self._volume['disks'], list):
+            raise BlivetAnsibleError(
+                "no disks specified for volume '%s'" % self._volume["name"]
+            )
+        elif not isinstance(self._volume["disks"], list):
             raise BlivetAnsibleError("volume disks must be specified as a list")
 
         if self._device is None:
-            raise BlivetAnsibleError("unable to resolve disk specified for volume '%s' (%s)" % (self._volume['name'], self._volume['disks']))
+            raise BlivetAnsibleError(
+                "unable to resolve disk specified for volume '%s' (%s)"
+                % (self._volume["name"], self._volume["disks"])
+            )
 
 
 class BlivetPartitionVolume(BlivetVolume):
     blivet_device_class = devices.PartitionDevice
 
     def _type_check(self):
-        return self._device.raw_device.type == 'partition'
+        return self._device.raw_device.type == "partition"
 
     def _get_device_id(self):
         device_id = None
-        if self._blivet_pool._disks[0].partitioned and len(self._blivet_pool._disks[0].children) == 1:
+        if (
+            self._blivet_pool._disks[0].partitioned
+            and len(self._blivet_pool._disks[0].children) == 1
+        ):
             device_id = self._blivet_pool._disks[0].children[0].name
 
         return device_id
@@ -583,22 +684,29 @@ class BlivetPartitionVolume(BlivetVolume):
         if self._blivet_pool:
             parent = self._blivet_pool._device
         else:
-            parent = self._blivet.devicetree.resolve_device(self._volume['pool'])
+            parent = self._blivet.devicetree.resolve_device(self._volume["pool"])
 
         if parent is None:
-            raise BlivetAnsibleError("failed to find pool '%s' for volume '%s'" % (self._blivet_pool['name'], self._volume['name']))
+            raise BlivetAnsibleError(
+                "failed to find pool '%s' for volume '%s'"
+                % (self._blivet_pool["name"], self._volume["name"])
+            )
 
         size = Size("256 MiB")
         try:
-            device = self._blivet.new_partition(parents=[parent], size=size, grow=True, fmt=self._get_format())
+            device = self._blivet.new_partition(
+                parents=[parent], size=size, grow=True, fmt=self._get_format()
+            )
         except Exception:
-            raise BlivetAnsibleError("failed set up volume '%s'" % self._volume['name'])
+            raise BlivetAnsibleError("failed set up volume '%s'" % self._volume["name"])
 
         self._blivet.create_device(device)
         try:
             do_partitioning(self._blivet)
         except Exception:
-            raise BlivetAnsibleError("partition allocation failed for volume '%s'" % self._volume['name'])
+            raise BlivetAnsibleError(
+                "partition allocation failed for volume '%s'" % self._volume["name"]
+            )
 
         self._device = device
 
@@ -609,7 +717,7 @@ class BlivetLVMVolume(BlivetVolume):
     def _get_device_id(self):
         if not self._blivet_pool._device:
             return None
-        return "%s-%s" % (self._blivet_pool._device.name, self._volume['name'])
+        return "%s-%s" % (self._blivet_pool._device.name, self._volume["name"])
 
     def _create(self):
         if self._device:
@@ -617,51 +725,75 @@ class BlivetLVMVolume(BlivetVolume):
 
         parent = self._blivet_pool._device
         if parent is None:
-            raise BlivetAnsibleError("failed to find pool '%s' for volume '%s'" % (self._blivet_pool['name'], self._volume['name']))
+            raise BlivetAnsibleError(
+                "failed to find pool '%s' for volume '%s'"
+                % (self._blivet_pool["name"], self._volume["name"])
+            )
 
         try:
-            size = Size(self._volume['size'])
+            size = Size(self._volume["size"])
         except Exception:
-            raise BlivetAnsibleError("invalid size '%s' specified for volume '%s'" % (self._volume['size'], self._volume['name']))
+            raise BlivetAnsibleError(
+                "invalid size '%s' specified for volume '%s'"
+                % (self._volume["size"], self._volume["name"])
+            )
 
         fmt = self._get_format()
-        trim_percent = (1.0 - float(parent.free_space / size))*100
+        trim_percent = (1.0 - float(parent.free_space / size)) * 100
         log.debug("size: %s ; %s", size, trim_percent)
         if size > parent.free_space:
             if trim_percent > MAX_TRIM_PERCENT:
-                raise BlivetAnsibleError("specified size for volume '%s' exceeds available space in pool '%s' (%s)"
-                                         % (size, parent.name, parent.free_space))
+                raise BlivetAnsibleError(
+                    "specified size for volume '%s' exceeds available space in pool '%s' (%s)"
+                    % (size, parent.name, parent.free_space)
+                )
             else:
-                log.info("adjusting %s size from %s to %s to fit in %s free space", self._volume['name'],
-                                                                                    size,
-                                                                                    parent.free_space,
-                                                                                    parent.name)
+                log.info(
+                    "adjusting %s size from %s to %s to fit in %s free space",
+                    self._volume["name"],
+                    size,
+                    parent.free_space,
+                    parent.name,
+                )
                 size = parent.free_space
 
         try:
-            device = self._blivet.new_lv(name=self._volume['name'],
-                                         parents=[parent], size=size, fmt=fmt)
+            device = self._blivet.new_lv(
+                name=self._volume["name"], parents=[parent], size=size, fmt=fmt
+            )
         except Exception as e:
-            raise BlivetAnsibleError("failed to set up volume '%s': %s" % (self._volume['name'], str(e)))
+            raise BlivetAnsibleError(
+                "failed to set up volume '%s': %s" % (self._volume["name"], str(e))
+            )
 
         self._blivet.create_device(device)
         self._device = device
 
 
 class BlivetMDRaidVolume(BlivetVolume):
-
-    def _process_device_numbers(self, members_count, requested_actives, requested_spares):
+    def _process_device_numbers(
+        self, members_count, requested_actives, requested_spares
+    ):
 
         active_count = members_count
         spare_count = 0
 
         if requested_actives is not None and requested_spares is not None:
-            if (requested_actives + requested_spares != members_count or
-                    requested_actives < 0 or requested_spares < 0):
-                raise BlivetAnsibleError("failed to set up volume '%s': cannot create RAID "
-                                         "with %s members (%s active and %s spare)"
-                                         % (self._volume['name'], members_count,
-                                            requested_actives, requested_spares))
+            if (
+                requested_actives + requested_spares != members_count
+                or requested_actives < 0
+                or requested_spares < 0
+            ):
+                raise BlivetAnsibleError(
+                    "failed to set up volume '%s': cannot create RAID "
+                    "with %s members (%s active and %s spare)"
+                    % (
+                        self._volume["name"],
+                        members_count,
+                        requested_actives,
+                        requested_spares,
+                    )
+                )
 
         if requested_actives is not None:
             active_count = requested_actives
@@ -685,7 +817,9 @@ class BlivetMDRaidVolume(BlivetVolume):
                     self._blivet.format_device(member_disk, label)
 
                     # create new partition
-                    member = self._blivet.new_partition(parents=[member_disk], grow=True)
+                    member = self._blivet.new_partition(
+                        parents=[member_disk], grow=True
+                    )
                     self._blivet.create_device(member)
                     self._blivet.format_device(member, fmt=get_format("mdmember"))
                     members.append(member)
@@ -697,16 +831,16 @@ class BlivetMDRaidVolume(BlivetVolume):
 
     def _update_from_device(self, param_name):
         """ Return True if param_name's value was retrieved from a looked-up device. """
-        if param_name == 'raid_level':
-            self._volume['raid_level'] = self._device.level.name
-        elif param_name == 'raid_chunk_size':
-            self._volume['raid_chunk_size'] = str(self._device.chunk_size)
-        elif param_name == 'raid_device_count':
-            self._volume['raid_device_count'] = self._device.member_devices
-        elif param_name == 'raid_spare_count':
-            self._volume['raid_spare_count'] = self._device.spares
-        elif param_name == 'raid_metadata_version':
-            self._volume['raid_metadata_version'] = self._device.metadata_version
+        if param_name == "raid_level":
+            self._volume["raid_level"] = self._device.level.name
+        elif param_name == "raid_chunk_size":
+            self._volume["raid_chunk_size"] = str(self._device.chunk_size)
+        elif param_name == "raid_device_count":
+            self._volume["raid_device_count"] = self._device.member_devices
+        elif param_name == "raid_spare_count":
+            self._volume["raid_spare_count"] = self._device.spares
+        elif param_name == "raid_metadata_version":
+            self._volume["raid_metadata_version"] = self._device.metadata_version
         else:
             return super(BlivetMDRaidVolume, self)._update_from_device(param_name)
 
@@ -728,7 +862,10 @@ class BlivetMDRaidVolume(BlivetVolume):
             try:
                 do_partitioning(self._blivet)
             except Exception as e:
-                raise BlivetAnsibleError("failed to allocate partitions for mdraid '%s': %s" % (self._volume['name'], str(e)))
+                raise BlivetAnsibleError(
+                    "failed to allocate partitions for mdraid '%s': %s"
+                    % (self._volume["name"], str(e))
+                )
 
         raid_array = self._new_mdarray(members)
 
@@ -764,16 +901,20 @@ _BLIVET_VOLUME_TYPES = {
     "disk": BlivetDiskVolume,
     "lvm": BlivetLVMVolume,
     "partition": BlivetPartitionVolume,
-    "raid": BlivetMDRaidVolume
+    "raid": BlivetMDRaidVolume,
 }
 
 
 def _get_blivet_volume(blivet_obj, volume, bpool=None):
     """ Return a BlivetVolume instance appropriate for the volume dict. """
     global volume_defaults
-    volume_type = volume.get('type', bpool._pool['type'] if bpool else volume_defaults['type'])
+    volume_type = volume.get(
+        "type", bpool._pool["type"] if bpool else volume_defaults["type"]
+    )
     if volume_type not in _BLIVET_VOLUME_TYPES:
-        raise BlivetAnsibleError("Volume '%s' has unknown type '%s'" % (volume['name'], volume_type))
+        raise BlivetAnsibleError(
+            "Volume '%s' has unknown type '%s'" % (volume["name"], volume_type)
+        )
 
     return _BLIVET_VOLUME_TYPES[volume_type](blivet_obj, volume, bpool=bpool)
 
@@ -796,19 +937,19 @@ class BlivetPool(BlivetBase):
         if self.ultimately_present and self.__class__.blivet_device_class is not None:
             packages.extend(self.__class__.blivet_device_class._packages)
 
-        if self._pool.get('encryption'):
-            packages.extend(get_format('luks').packages)
+        if self._pool.get("encryption"):
+            packages.extend(get_format("luks").packages)
 
         return packages
 
     @property
     def ultimately_present(self):
         """ Should this pool be present when we are finished? """
-        return self._pool.get('state', 'present') == 'present'
+        return self._pool.get("state", "present") == "present"
 
     @property
     def _is_raid(self):
-        return self._pool.get('raid_level') not in [None, "null", ""]
+        return self._pool.get("raid_level") not in [None, "null", ""]
 
     def _member_management_is_destructive(self):
         return False
@@ -849,25 +990,30 @@ class BlivetPool(BlivetBase):
         if self._disks:
             return
 
-        if not self._device and not self._pool['disks']:
-            raise BlivetAnsibleError("no disks specified for pool '%s'" % self._pool['name'])
-        elif not isinstance(self._pool['disks'], list):
+        if not self._device and not self._pool["disks"]:
+            raise BlivetAnsibleError(
+                "no disks specified for pool '%s'" % self._pool["name"]
+            )
+        elif not isinstance(self._pool["disks"], list):
             raise BlivetAnsibleError("pool disks must be specified as a list")
 
         disks = list()
-        for spec in self._pool['disks']:
+        for spec in self._pool["disks"]:
             device = self._blivet.devicetree.resolve_device(spec)
             if device is not None:  # XXX fail if any disk isn't resolved?
                 disks.append(device)
 
-        if self._pool['disks'] and not self._device and not disks:
-            raise BlivetAnsibleError("unable to resolve any disks specified for pool '%s' (%s)" % (self._pool['name'], self._pool['disks']))
+        if self._pool["disks"] and not self._device and not disks:
+            raise BlivetAnsibleError(
+                "unable to resolve any disks specified for pool '%s' (%s)"
+                % (self._pool["name"], self._pool["disks"])
+            )
 
         self._disks = disks
 
     def _look_up_device(self):
         """ Look up the pool in blivet's device tree. """
-        device = self._blivet.devicetree.resolve_device(self._pool['name'])
+        device = self._blivet.devicetree.resolve_device(self._pool["name"])
         if device is None:
             return
 
@@ -895,45 +1041,62 @@ class BlivetPool(BlivetBase):
         """ Return True if param_name's value was retrieved from a looked-up device. """
         # We wouldn't have the pool device if the member devices weren't unlocked, so we do not
         # have to consider the case where the devices are unlocked like we do for volumes.
-        encrypted = bool(self._device.parents) and all("luks" in d.type for d in self._device.parents)
-        raid = len(self._device.parents) == 1 and hasattr(self._device.parents[0].raw_device, 'level')
+        encrypted = bool(self._device.parents) and all(
+            "luks" in d.type for d in self._device.parents
+        )
+        raid = len(self._device.parents) == 1 and hasattr(
+            self._device.parents[0].raw_device, "level"
+        )
         log.debug("BlivetPool._update_from_device: %s", self._device)
 
-        if param_name == 'disks':
-            self._pool['disks'] = [d.name for d in self._device.disks]
-        elif param_name == 'encryption':
-            self._pool['encryption'] = encrypted
-        elif param_name == 'encryption_key_size' and encrypted:
-            self._pool['encryption_key_size'] = self._device.parents[0].parents[0].format.key_size
-        elif param_name == 'encryption_key_file' and encrypted:
-            self._pool['encryption_key_file'] = self._device.parents[0].parents[0].format.key_file
-        elif param_name == 'encryption_cipher' and encrypted:
-            self._pool['encryption_cipher'] = self._device.parents[0].parents[0].format.cipher
-        elif param_name == 'encryption_luks_version' and encrypted:
-            self._pool['encryption_luks_version'] = self._device.parents[0].parents[0].format.luks_version
-        elif param_name == 'raid_level' and raid:
-            self._pool['raid_level'] = self._device.parents[0].raw_device.level.name
-        elif param_name == 'raid_chunk_size' and raid:
-            self._pool['raid_chunk_size'] = str(self._device.parents[0].raw_device.chunk_size)
-        elif param_name == 'raid_device_count' and raid:
-            self._pool['raid_device_count'] = self._device.parents[0].raw_device.member_devices
-        elif param_name == 'raid_spare_count' and raid:
-            self._pool['raid_spare_count'] = self._device.parents[0].raw_device.spares
-        elif param_name == 'raid_metadata_version' and raid:
-            self._pool['raid_metadata_version'] = self._device.parents[0].raw_device.metadata_version
+        if param_name == "disks":
+            self._pool["disks"] = [d.name for d in self._device.disks]
+        elif param_name == "encryption":
+            self._pool["encryption"] = encrypted
+        elif param_name == "encryption_key_size" and encrypted:
+            self._pool["encryption_key_size"] = (
+                self._device.parents[0].parents[0].format.key_size
+            )
+        elif param_name == "encryption_key_file" and encrypted:
+            self._pool["encryption_key_file"] = (
+                self._device.parents[0].parents[0].format.key_file
+            )
+        elif param_name == "encryption_cipher" and encrypted:
+            self._pool["encryption_cipher"] = (
+                self._device.parents[0].parents[0].format.cipher
+            )
+        elif param_name == "encryption_luks_version" and encrypted:
+            self._pool["encryption_luks_version"] = (
+                self._device.parents[0].parents[0].format.luks_version
+            )
+        elif param_name == "raid_level" and raid:
+            self._pool["raid_level"] = self._device.parents[0].raw_device.level.name
+        elif param_name == "raid_chunk_size" and raid:
+            self._pool["raid_chunk_size"] = str(
+                self._device.parents[0].raw_device.chunk_size
+            )
+        elif param_name == "raid_device_count" and raid:
+            self._pool["raid_device_count"] = self._device.parents[
+                0
+            ].raw_device.member_devices
+        elif param_name == "raid_spare_count" and raid:
+            self._pool["raid_spare_count"] = self._device.parents[0].raw_device.spares
+        elif param_name == "raid_metadata_version" and raid:
+            self._pool["raid_metadata_version"] = self._device.parents[
+                0
+            ].raw_device.metadata_version
         else:
             return False
 
         return True
 
-
     def _apply_defaults(self):
         global pool_defaults
         for name, default in pool_defaults.items():
             if name in self._pool:
                 continue
 
-            default = None if default in ('none', 'None', 'null') else default
+            default = None if default in ("none", "None", "null") else default
 
             if self._device:
                 if not self._update_from_device(name):
@@ -948,14 +1111,19 @@ class BlivetPool(BlivetBase):
         for disk in self._disks:
             if not disk.isleaf or disk.format.type is not None:
                 if safe_mode:
-                    raise BlivetAnsibleError("cannot remove existing formatting and/or devices on disk '%s' (pool '%s') in safe mode" % (disk.name, self._pool['name']))
+                    raise BlivetAnsibleError(
+                        "cannot remove existing formatting and/or devices on disk '%s' (pool '%s') in safe mode"
+                        % (disk.name, self._pool["name"])
+                    )
                 else:
                     self._blivet.devicetree.recursive_remove(disk)
 
             if use_partitions:
                 label = get_format("disklabel", device=disk.path)
                 self._blivet.format_device(disk, label)
-                member = self._blivet.new_partition(parents=[disk], size=Size("256MiB"), grow=True)
+                member = self._blivet.new_partition(
+                    parents=[disk], size=Size("256MiB"), grow=True
+                )
                 self._blivet.create_device(member)
             else:
                 member = disk
@@ -966,9 +1134,8 @@ class BlivetPool(BlivetBase):
                 self._blivet.format_device(member, self._get_format())
             members.append(member)
 
-
         if self._is_raid:
-            raid_name = "%s-1" % self._pool['name']
+            raid_name = "%s-1" % self._pool["name"]
 
             raid_array = self._new_mdarray(members, raid_name=raid_name)
 
@@ -981,14 +1148,15 @@ class BlivetPool(BlivetBase):
             try:
                 do_partitioning(self._blivet)
             except Exception:
-                raise BlivetAnsibleError("failed to allocate partitions for pool '%s'" % self._pool['name'])
+                raise BlivetAnsibleError(
+                    "failed to allocate partitions for pool '%s'" % self._pool["name"]
+                )
 
         return result
 
-
     def _get_volumes(self):
         """ Set up BlivetVolume instances for this pool's volumes. """
-        for volume in self._pool.get('volumes', []):
+        for volume in self._pool.get("volumes", []):
             bvolume = _get_blivet_volume(self._blivet, volume, self)
             self._blivet_volumes.append(bvolume)
 
@@ -1013,7 +1181,10 @@ class BlivetPool(BlivetBase):
             return
         elif self._member_management_is_destructive():
             if safe_mode:
-                raise BlivetAnsibleError("cannot remove and recreate existing pool '%s' in safe mode" % self._pool['name'])
+                raise BlivetAnsibleError(
+                    "cannot remove and recreate existing pool '%s' in safe mode"
+                    % self._pool["name"]
+                )
             else:
                 self._destroy()
 
@@ -1031,15 +1202,22 @@ class BlivetPartitionPool(BlivetPool):
         self._device = self._disks[0]
 
     def _create(self):
-        if self._device.format.type != "disklabel" or \
-           (disklabel_type and self._device.format.label_type != disklabel_type):
+        if self._device.format.type != "disklabel" or (
+            disklabel_type and self._device.format.label_type != disklabel_type
+        ):
             if safe_mode:
-                raise BlivetAnsibleError("cannot remove existing formatting and/or devices on disk '%s' "
-                                         "(pool '%s') in safe mode" % (self._device.name, self._pool['name']))
+                raise BlivetAnsibleError(
+                    "cannot remove existing formatting and/or devices on disk '%s' "
+                    "(pool '%s') in safe mode" % (self._device.name, self._pool["name"])
+                )
             else:
-                self._blivet.devicetree.recursive_remove(self._device, remove_device=False)
+                self._blivet.devicetree.recursive_remove(
+                    self._device, remove_device=False
+                )
 
-            label = get_format("disklabel", device=self._device.path, label_type=disklabel_type)
+            label = get_format(
+                "disklabel", device=self._device.path, label_type=disklabel_type
+            )
             self._blivet.format_device(self._device, label)
 
 
@@ -1053,9 +1231,13 @@ class BlivetLVMPool(BlivetPool):
         if self._device is None:
             return False
 
-        if self._pool['encryption'] and not all(m.encrypted for m in self._device.parents):
+        if self._pool["encryption"] and not all(
+            m.encrypted for m in self._device.parents
+        ):
             return True
-        elif not self._pool['encryption'] and any(m.encrypted for m in self._device.parents):
+        elif not self._pool["encryption"] and any(
+            m.encrypted for m in self._device.parents
+        ):
             return True
 
         return False
@@ -1080,49 +1262,50 @@ class BlivetLVMPool(BlivetPool):
 
         members = self._manage_encryption(self._create_members())
         try:
-            pool_device = self._blivet.new_vg(name=self._pool['name'], parents=members)
+            pool_device = self._blivet.new_vg(name=self._pool["name"], parents=members)
         except Exception as e:
-            raise BlivetAnsibleError("failed to set up pool '%s': %s" % (self._pool['name'], str(e)))
+            raise BlivetAnsibleError(
+                "failed to set up pool '%s': %s" % (self._pool["name"], str(e))
+            )
 
         self._blivet.create_device(pool_device)
         self._device = pool_device
 
 
-_BLIVET_POOL_TYPES = {
-    "partition": BlivetPartitionPool,
-    "lvm": BlivetLVMPool
-}
+_BLIVET_POOL_TYPES = {"partition": BlivetPartitionPool, "lvm": BlivetLVMPool}
 
 
 def _get_blivet_pool(blivet_obj, pool):
     """ Return an appropriate BlivetPool instance for the pool dict. """
-    if 'type' not in pool:
+    if "type" not in pool:
         global pool_defaults
-        pool['type'] = pool_defaults['type']
+        pool["type"] = pool_defaults["type"]
 
-    if pool['type'] not in _BLIVET_POOL_TYPES:
-        raise BlivetAnsibleError("Pool '%s' has unknown type '%s'" % (pool['name'], pool['type']))
+    if pool["type"] not in _BLIVET_POOL_TYPES:
+        raise BlivetAnsibleError(
+            "Pool '%s' has unknown type '%s'" % (pool["name"], pool["type"])
+        )
 
-    return _BLIVET_POOL_TYPES[pool['type']](blivet_obj, pool)
+    return _BLIVET_POOL_TYPES[pool["type"]](blivet_obj, pool)
 
 
 def manage_volume(b, volume):
     """ Schedule actions as needed to manage a single standalone volume. """
     bvolume = _get_blivet_volume(b, volume)
     bvolume.manage()
-    volume['_device'] = bvolume._volume.get('_device', '')
-    volume['_raw_device'] = bvolume._volume.get('_raw_device', '')
-    volume['_mount_id'] = bvolume._volume.get('_mount_id', '')
+    volume["_device"] = bvolume._volume.get("_device", "")
+    volume["_raw_device"] = bvolume._volume.get("_raw_device", "")
+    volume["_mount_id"] = bvolume._volume.get("_mount_id", "")
 
 
 def manage_pool(b, pool):
     """ Schedule actions as needed to manage a single pool and its volumes. """
     bpool = _get_blivet_pool(b, pool)
     bpool.manage()
-    for (volume, bvolume) in zip(pool['volumes'], bpool._blivet_volumes):
-        volume['_device'] = bvolume._volume.get('_device', '')
-        volume['_raw_device'] = bvolume._volume.get('_raw_device', '')
-        volume['_mount_id'] = bvolume._volume.get('_mount_id', '')
+    for (volume, bvolume) in zip(pool["volumes"], bpool._blivet_volumes):
+        volume["_device"] = bvolume._volume.get("_device", "")
+        volume["_raw_device"] = bvolume._volume.get("_raw_device", "")
+        volume["_mount_id"] = bvolume._volume.get("_mount_id", "")
 
 
 class FSTab(object):
@@ -1141,7 +1324,7 @@ class FSTab(object):
         if self._entries:
             self.reset()
 
-        for line in open('/etc/fstab').readlines():
+        for line in open("/etc/fstab").readlines():
             if line.lstrip().startswith("#"):
                 continue
 
@@ -1150,23 +1333,27 @@ class FSTab(object):
                 continue
 
             device = self._blivet.devicetree.resolve_device(fields[0])
-            self._entries.append(dict(device_id=fields[0],
-                                      device_path=getattr(device, 'path', None),
-                                      fs_type=fields[2],
-                                      mount_point=fields[1],
-                                      mount_options=fields[3]))
+            self._entries.append(
+                dict(
+                    device_id=fields[0],
+                    device_path=getattr(device, "path", None),
+                    fs_type=fields[2],
+                    mount_point=fields[1],
+                    mount_options=fields[3],
+                )
+            )
 
 
 def get_mount_info(pools, volumes, actions, fstab):
-    """ Return a list of argument dicts to pass to the mount module to manage mounts.
+    """Return a list of argument dicts to pass to the mount module to manage mounts.
 
-        The overall approach is to remove existing mounts associated with file systems
-        we are removing and those with changed mount points, re-adding them with the
-        new mount point later.
+    The overall approach is to remove existing mounts associated with file systems
+    we are removing and those with changed mount points, re-adding them with the
+    new mount point later.
 
-        Removed mounts go directly into the mount_info list, which is the return value,
-        while added/active mounts to a list that gets appended to the mount_info list
-        at the end to ensure that removals happen first.
+    Removed mounts go directly into the mount_info list, which is the return value,
+    while added/active mounts to a list that gets appended to the mount_info list
+    at the end to ensure that removals happen first.
     """
     mount_info = list()
     mount_vols = list()
@@ -1174,33 +1361,50 @@ def get_mount_info(pools, volumes, actions, fstab):
     # account for mounts removed by removing or reformatting volumes
     if actions:
         for action in actions:
-            if action.is_destroy and action.is_format and action.format.type is not None:
-                mount = fstab.lookup('device_path', action.device.path)
+            if (
+                action.is_destroy
+                and action.is_format
+                and action.format.type is not None
+            ):
+                mount = fstab.lookup("device_path", action.device.path)
                 if mount is not None:
-                    mount_info.append({"src": mount['device_id'], "path": mount['mount_point'],
-                                       'state': 'absent', 'fstype': mount['fs_type']})
+                    mount_info.append(
+                        {
+                            "src": mount["device_id"],
+                            "path": mount["mount_point"],
+                            "state": "absent",
+                            "fstype": mount["fs_type"],
+                        }
+                    )
 
     def handle_new_mount(volume, fstab):
         replace = None
         mounted = False
 
-        mount = fstab.lookup('device_path', volume['_device'])
-        if (volume['mount_point'] and volume['mount_point'].startswith('/')) \
-           or volume['fs_type'] == 'swap':
+        mount = fstab.lookup("device_path", volume["_device"])
+        if (volume["mount_point"] and volume["mount_point"].startswith("/")) or volume[
+            "fs_type"
+        ] == "swap":
             mounted = True
 
         # handle removal of existing mounts of this volume
-        if mount and mount['fs_type'] != 'swap' and mount['mount_point'] != volume['mount_point']:
-            replace = dict(path=mount['mount_point'], state="absent")
-        elif mount and mount['fs_type'] == 'swap':
-            replace = dict(src=mount['device_id'], fstype="swap", path="none", state="absent")
+        if (
+            mount
+            and mount["fs_type"] != "swap"
+            and mount["mount_point"] != volume["mount_point"]
+        ):
+            replace = dict(path=mount["mount_point"], state="absent")
+        elif mount and mount["fs_type"] == "swap":
+            replace = dict(
+                src=mount["device_id"], fstype="swap", path="none", state="absent"
+            )
 
         return mounted, replace
 
     # account for mounts that we set up or are replacing in pools
     for pool in pools:
-        for volume in pool['volumes']:
-            if pool['state'] == 'present' and volume['state'] == 'present':
+        for volume in pool["volumes"]:
+            if pool["state"] == "present" and volume["state"] == "present":
                 mounted, replace = handle_new_mount(volume, fstab)
                 if replace:
                     mount_info.append(replace)
@@ -1209,7 +1413,7 @@ def get_mount_info(pools, volumes, actions, fstab):
 
     # account for mounts that we set up or are replacing in standalone volumes
     for volume in volumes:
-        if volume['state'] == 'present':
+        if volume["state"] == "present":
             mounted, replace = handle_new_mount(volume, fstab)
             if replace:
                 mount_info.append(replace)
@@ -1217,13 +1421,19 @@ def get_mount_info(pools, volumes, actions, fstab):
                 mount_vols.append(volume)
 
     for volume in mount_vols:
-        mount_info.append({'src': volume['_mount_id'],
-                           'path': volume['mount_point'] if volume['fs_type'] != "swap" else "none",
-                           'fstype': volume['fs_type'],
-                           'opts': volume['mount_options'],
-                           'dump': volume['mount_check'],
-                           'passno': volume['mount_passno'],
-                           'state': 'mounted' if volume['fs_type'] != "swap" else "present"})
+        mount_info.append(
+            {
+                "src": volume["_mount_id"],
+                "path": volume["mount_point"]
+                if volume["fs_type"] != "swap"
+                else "none",
+                "fstype": volume["fs_type"],
+                "opts": volume["mount_options"],
+                "dump": volume["mount_check"],
+                "passno": volume["mount_passno"],
+                "state": "mounted" if volume["fs_type"] != "swap" else "present",
+            }
+        )
 
     return mount_info
 
@@ -1231,15 +1441,19 @@ def get_mount_info(pools, volumes, actions, fstab):
 def get_crypt_info(actions):
     info = list()
     for action in actions:
-        if not (action.is_format and action.format.type == 'luks'):
+        if not (action.is_format and action.format.type == "luks"):
             continue
 
-        info.append(dict(backing_device=action.device.path,
-                         name=action.format.map_name,
-                         password=action.format.key_file or '-',
-                         state='present' if action.is_create else 'absent'))
+        info.append(
+            dict(
+                backing_device=action.device.path,
+                name=action.format.map_name,
+                password=action.format.key_file or "-",
+                state="present" if action.is_create else "absent",
+            )
+        )
 
-    return sorted(info, key=lambda e: e['state'])
+    return sorted(info, key=lambda e: e["state"])
 
 
 def get_required_packages(b, pools, volumes):
@@ -1259,66 +1473,70 @@ def get_required_packages(b, pools, volumes):
 
 
 def update_fstab_identifiers(b, pools, volumes):
-    """ Update fstab device identifiers.
+    """Update fstab device identifiers.
 
-        This is to pick up new UUIDs for newly-formatted devices.
+    This is to pick up new UUIDs for newly-formatted devices.
     """
     all_volumes = volumes[:]
     for pool in pools:
-        if not pool['state'] == 'present':
+        if not pool["state"] == "present":
             continue
 
-        all_volumes += pool['volumes']
+        all_volumes += pool["volumes"]
 
     for volume in all_volumes:
-        if volume['state'] == 'present':
-            device = b.devicetree.resolve_device(volume['_mount_id'])
-            if device is None and volume['encryption']:
-                device = b.devicetree.resolve_device(volume['_raw_device'])
+        if volume["state"] == "present":
+            device = b.devicetree.resolve_device(volume["_mount_id"])
+            if device is None and volume["encryption"]:
+                device = b.devicetree.resolve_device(volume["_raw_device"])
                 if device is not None and not device.isleaf:
                     device = device.children[0]
-                    volume['_device'] = device.path
+                    volume["_device"] = device.path
 
             if device is None:
-                raise BlivetAnsibleError("failed to look up device for volume %s (%s/%s)" % (volume['name'], volume['_device'], volume['_mount_id']))
-            volume['_mount_id'] = device.fstab_spec
-            if device.format.type == 'swap':
+                raise BlivetAnsibleError(
+                    "failed to look up device for volume %s (%s/%s)"
+                    % (volume["name"], volume["_device"], volume["_mount_id"])
+                )
+            volume["_mount_id"] = device.fstab_spec
+            if device.format.type == "swap":
                 device.format.setup()
 
             if device.status:
-                volume['_kernel_device'] = os.path.realpath(device.path)
+                volume["_kernel_device"] = os.path.realpath(device.path)
             if device.raw_device.status:
-                volume['_raw_kernel_device'] = os.path.realpath(device.raw_device.path)
+                volume["_raw_kernel_device"] = os.path.realpath(device.raw_device.path)
 
 
 def activate_swaps(b, pools, volumes):
     """ Activate all swaps specified as present. """
     all_volumes = volumes[:]
     for pool in pools:
-        if not pool['state'] == 'present':
+        if not pool["state"] == "present":
             continue
 
-        all_volumes += pool['volumes']
+        all_volumes += pool["volumes"]
 
     for volume in all_volumes:
-        if volume['state'] == 'present':
-            device = b.devicetree.resolve_device(volume['_mount_id'])
-            if device.format.type == 'swap':
+        if volume["state"] == "present":
+            device = b.devicetree.resolve_device(volume["_mount_id"])
+            if device.format.type == "swap":
                 device.format.setup()
 
 
 def run_module():
     # available arguments/parameters that a user can pass
     module_args = dict(
-        pools=dict(type='list'),
-        volumes=dict(type='list'),
-        packages_only=dict(type='bool', required=False, default=False),
-        disklabel_type=dict(type='str', required=False, default=None),
-        safe_mode=dict(type='bool', required=False, default=True),
-        pool_defaults=dict(type='dict', required=False),
-        volume_defaults=dict(type='dict', required=False),
-        use_partitions=dict(type='bool', required=False, default=True),
-        diskvolume_mkfs_option_map=dict(type='dict', required=False, default={}))
+        pools=dict(type="list"),
+        volumes=dict(type="list"),
+        packages_only=dict(type="bool", required=False, default=False),
+        disklabel_type=dict(type="str", required=False, default=None),
+        safe_mode=dict(type="bool", required=False, default=True),
+        pool_defaults=dict(type="dict", required=False),
+        volume_defaults=dict(type="dict", required=False),
+        use_partitions=dict(type="bool", required=False, default=True),
+        diskvolume_mkfs_option_map=dict(type="dict", required=False, default={}),
+    )
 
     # seed the result dict in the object
     result = dict(
@@ -1332,47 +1550,52 @@ def run_module():
         packages=list(),
     )
 
-    module = AnsibleModule(argument_spec=module_args,
-                           supports_check_mode=True)
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
     if not BLIVET_PACKAGE:
-        module.fail_json(msg="Failed to import the blivet or blivet3 Python modules",
-                         exception=inspect.cleandoc("""
+        module.fail_json(
+            msg="Failed to import the blivet or blivet3 Python modules",
+            exception=inspect.cleandoc(
+                """
                          blivet3 exception:
                          {}
                          blivet exception:
-                         {}""").format(LIB_IMP_ERR3, LIB_IMP_ERR))
+                         {}"""
+            ).format(LIB_IMP_ERR3, LIB_IMP_ERR),
+        )
 
-    if not module.params['pools'] and not module.params['volumes']:
+    if not module.params["pools"] and not module.params["volumes"]:
         module.exit_json(**result)
 
     global disklabel_type
-    disklabel_type = module.params['disklabel_type']
+    disklabel_type = module.params["disklabel_type"]
 
     global use_partitions
-    use_partitions = module.params['use_partitions']
+    use_partitions = module.params["use_partitions"]
 
     global safe_mode
-    safe_mode = module.params['safe_mode']
+    safe_mode = module.params["safe_mode"]
 
     global diskvolume_mkfs_option_map
-    diskvolume_mkfs_option_map = module.params['diskvolume_mkfs_option_map']
+    diskvolume_mkfs_option_map = module.params["diskvolume_mkfs_option_map"]
 
     global pool_defaults
-    if 'pool_defaults' in module.params:
-        pool_defaults = module.params['pool_defaults']
+    if "pool_defaults" in module.params:
+        pool_defaults = module.params["pool_defaults"]
 
     global volume_defaults
-    if 'volume_defaults' in module.params:
-        volume_defaults = module.params['volume_defaults']
+    if "volume_defaults" in module.params:
+        volume_defaults = module.params["volume_defaults"]
 
     b = Blivet()
     b.reset()
     fstab = FSTab(b)
     actions = list()
 
-    if module.params['packages_only']:
+    if module.params["packages_only"]:
         try:
-            result['packages'] = get_required_packages(b, module.params['pools'], module.params['volumes'])
+            result["packages"] = get_required_packages(
+                b, module.params["pools"], module.params["volumes"]
+            )
         except BlivetAnsibleError as e:
             module.fail_json(msg=str(e), **result)
         module.exit_json(**result)
@@ -1388,44 +1611,56 @@ def run_module():
             sys_path = action.device.path
             if os.path.islink(sys_path):
                 sys_path = os.readlink(action.device.path)
-            trigger(action='change', subsystem='block', name=os.path.basename(sys_path))
+            trigger(action="change", subsystem="block", name=os.path.basename(sys_path))
 
     def action_dict(action):
-        return dict(action=action.type_desc_str,
-                    fs_type=action.format.type if action.is_format else None,
-                    device=action.device.path)
+        return dict(
+            action=action.type_desc_str,
+            fs_type=action.format.type if action.is_format else None,
+            device=action.device.path,
+        )
 
-    duplicates = find_duplicate_names(module.params['pools'])
+    duplicates = find_duplicate_names(module.params["pools"])
     if duplicates:
-        module.fail_json(msg="multiple pools with the same name: {0}".format(",".join(duplicates)),
-                         **result)
-    for pool in module.params['pools']:
-        duplicates = find_duplicate_names(pool.get('volumes', list()))
+        module.fail_json(
+            msg="multiple pools with the same name: {0}".format(",".join(duplicates)),
+            **result
+        )
+    for pool in module.params["pools"]:
+        duplicates = find_duplicate_names(pool.get("volumes", list()))
         if duplicates:
-            module.fail_json(msg="multiple volumes in pool '{0}' with the "
-                                 "same name: {1}".format(pool['name'], ",".join(duplicates)),
-                             **result)
+            module.fail_json(
+                msg="multiple volumes in pool '{0}' with the "
+                "same name: {1}".format(pool["name"], ",".join(duplicates)),
+                **result
+            )
         try:
             manage_pool(b, pool)
         except BlivetAnsibleError as e:
             module.fail_json(msg=str(e), **result)
 
-    duplicates = find_duplicate_names(module.params['volumes'])
+    duplicates = find_duplicate_names(module.params["volumes"])
     if duplicates:
-        module.fail_json(msg="multiple volumes with the same name: {0}".format(",".join(duplicates)),
-                         **result)
-    for volume in module.params['volumes']:
+        module.fail_json(
+            msg="multiple volumes with the same name: {0}".format(",".join(duplicates)),
+            **result
+        )
+    for volume in module.params["volumes"]:
         try:
             manage_volume(b, volume)
         except BlivetAnsibleError as e:
             module.fail_json(msg=str(e), **result)
 
     scheduled = b.devicetree.actions.find()
-    result['packages'] = b.packages[:]
+    result["packages"] = b.packages[:]
 
     for action in scheduled:
-        if (action.is_destroy or action.is_resize) and action.is_format and action.format.exists and \
-           (action.format.mountable or action.format.type == "swap"):
+        if (
+            (action.is_destroy or action.is_resize)
+            and action.is_format
+            and action.format.exists
+            and (action.format.mountable or action.format.type == "swap")
+        ):
             action.format.teardown()
 
     if scheduled:
@@ -1433,21 +1668,27 @@ def run_module():
         callbacks.action_executed.add(record_action)
         callbacks.action_executed.add(ensure_udev_update)
         try:
-            b.devicetree.actions.process(devices=b.devicetree.devices, dry_run=module.check_mode)
+            b.devicetree.actions.process(
+                devices=b.devicetree.devices, dry_run=module.check_mode
+            )
         except Exception as e:
-            module.fail_json(msg="Failed to commit changes to disk: %s" % str(e), **result)
+            module.fail_json(
+                msg="Failed to commit changes to disk: %s" % str(e), **result
+            )
         finally:
-            result['changed'] = True
-            result['actions'] = [action_dict(a) for a in actions]
+            result["changed"] = True
+            result["actions"] = [action_dict(a) for a in actions]
 
-    update_fstab_identifiers(b, module.params['pools'], module.params['volumes'])
-    activate_swaps(b, module.params['pools'], module.params['volumes'])
+    update_fstab_identifiers(b, module.params["pools"], module.params["volumes"])
+    activate_swaps(b, module.params["pools"], module.params["volumes"])
 
-    result['mounts'] = get_mount_info(module.params['pools'], module.params['volumes'], actions, fstab)
-    result['crypts'] = get_crypt_info(actions)
-    result['leaves'] = [d.path for d in b.devicetree.leaves]
-    result['pools'] = module.params['pools']
-    result['volumes'] = module.params['volumes']
+    result["mounts"] = get_mount_info(
+        module.params["pools"], module.params["volumes"], actions, fstab
+    )
+    result["crypts"] = get_crypt_info(actions)
+    result["leaves"] = [d.path for d in b.devicetree.leaves]
+    result["pools"] = module.params["pools"]
+    result["volumes"] = module.params["volumes"]
 
     # success - return result
     module.exit_json(**result)
@@ -1456,5 +1697,6 @@ def run_module():
 def main():
     run_module()
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     main()
diff --git a/library/blockdev_info.py b/library/blockdev_info.py
index 52ddd78..ca1577f 100644
--- a/library/blockdev_info.py
+++ b/library/blockdev_info.py
@@ -1,35 +1,41 @@
 #!/usr/bin/python
 
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 ANSIBLE_METADATA = {
-    'metadata_version': '1.1',
-    'status': ['preview'],
-    'supported_by': 'community'
+    "metadata_version": "1.1",
+    "status": ["preview"],
+    "supported_by": "community",
 }
 
-DOCUMENTATION = '''
+DOCUMENTATION = """
 ---
 module: blockdev_info
 short_description: Collect info about block devices in the system.
 version_added: "2.5"
 description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
     - "This module collects information about block devices"
-options:
+options: {}
 author:
-    - David Lehman (dlehman@redhat.com)
-'''
+    - David Lehman (@dwlehman)
+"""
 
-EXAMPLES = '''
+EXAMPLES = """
 - name: Get info about block devices
   blockdev_info:
   register: blk_info
 
-'''
+"""
 
-RETURN = '''
+RETURN = """
 info:
     description: dict w/ device path keys and device info dict values
+    returned: success
     type: dict
-'''
+"""
 
 import os
 import shlex
@@ -38,7 +44,7 @@ from ansible.module_utils.basic import AnsibleModule
 
 
 LSBLK_DEVICE_TYPES = {"part": "partition"}
-DEV_MD_DIR = '/dev/md'
+DEV_MD_DIR = "/dev/md"
 
 
 def fixup_md_path(path):
@@ -59,7 +65,9 @@ def fixup_md_path(path):
 
 
 def get_block_info(run_cmd):
-    buf = run_cmd(["lsblk", "-o", "NAME,FSTYPE,LABEL,UUID,TYPE,SIZE", "-p", "-P", "-a"])[1]
+    buf = run_cmd(
+        ["lsblk", "-o", "NAME,FSTYPE,LABEL,UUID,TYPE,SIZE", "-p", "-P", "-a"]
+    )[1]
     info = dict()
     for line in buf.splitlines():
         dev = dict()
@@ -75,7 +83,7 @@ def get_block_info(run_cmd):
 
                 dev[key.lower()] = LSBLK_DEVICE_TYPES.get(value, value)
         if dev:
-            info[dev['name']] = dev
+            info[dev["name"]] = dev
 
     return info
 
@@ -87,13 +95,10 @@ def run_module():
         info=None,
     )
 
-    module = AnsibleModule(
-        argument_spec=module_args,
-        supports_check_mode=True
-    )
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
     try:
-        result['info'] = get_block_info(module.run_command)
+        result["info"] = get_block_info(module.run_command)
     except Exception:
         module.fail_json(msg="Failed to collect block device info.")
 
@@ -104,5 +109,5 @@ def main():
     run_module()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()
diff --git a/library/bsize.py b/library/bsize.py
index 40442f5..524b0f9 100644
--- a/library/bsize.py
+++ b/library/bsize.py
@@ -1,12 +1,16 @@
 #!/usr/bin/python
 
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 ANSIBLE_METADATA = {
-    'metadata_version': '1.1',
-    'status': ['preview'],
-    'supported_by': 'community'
+    "metadata_version": "1.1",
+    "status": ["preview"],
+    "supported_by": "community",
 }
 
-DOCUMENTATION = '''
+DOCUMENTATION = """
 ---
 module: bsize
 
@@ -15,6 +19,7 @@ short_description: Module for basic manipulation with byte sizes
 version_added: "2.5"
 
 description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
     - "Module accepts byte size strings with the units and produces strings in
       form of input accepted by different storage tools"
 
@@ -23,67 +28,72 @@ options:
         description:
             - String containing number and byte units
         required: true
+        type: str
 
 author:
-    - Jan Pokorny (japokorn@redhat.com)
-'''
+    - Jan Pokorny (@japokorn)
+"""
 
-EXAMPLES = '''
+EXAMPLES = """
 # Obtain sizes in format for various tools
 - name: Get 10 KiB size
   bsize:
     size: 10 KiB
-'''
+"""
 
-RETURN = '''
+RETURN = """
 size:
     description: Size in binary format units
     type: str
+    returned: success
 bytes:
     description: Size in bytes
     type: int
+    returned: success
 lvm:
     description: Size in binary format. No space after the number,
                  first letter of unit prefix in lowercase only
     type: str
+    returned: success
 parted:
     description: Size in binary format. No space after the number
     type: str
-'''
+    returned: success
+"""
 
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.storage_lsr.size import Size
 
+
 def run_module():
     # available arguments/parameters that a user can pass
     module_args = dict(
-        size=dict(type='str', required=True),
+        size=dict(type="str", required=True),
     )
 
     # seed the result dict in the object
-    result = dict(
-        changed=False
-    )
+    result = dict(changed=False)
 
-    module = AnsibleModule(argument_spec=module_args,
-                           supports_check_mode=True)
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
-    size = Size(module.params['size'])
+    size = Size(module.params["size"])
 
-    result['size'] = size.get(fmt="%d %sb")
-    result['bytes'] = size.bytes
-    result['lvm'] = size.get(fmt="%d%sb").lower()[:-2]
-    result['parted'] = size.get(fmt="%d%sb")
+    result["size"] = size.get(fmt="%d %sb")
+    result["bytes"] = size.bytes
+    result["lvm"] = size.get(fmt="%d%sb").lower()[:-2]
+    result["parted"] = size.get(fmt="%d%sb")
 
     # use whatever logic you need to determine whether or not this module
     # made any modifications to your target
-    result['changed'] = False
+    result["changed"] = False
 
     # success - return result
     module.exit_json(**result)
 
+
 def main():
     run_module()
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     main()
diff --git a/library/find_unused_disk.py b/library/find_unused_disk.py
index 0a6fc7d..c688170 100644
--- a/library/find_unused_disk.py
+++ b/library/find_unused_disk.py
@@ -1,10 +1,15 @@
 #!/usr/bin/python
 
-DOCUMENTATION = '''
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
+DOCUMENTATION = """
 ---
 module: find_unused_disk
 short_description: Gets unused disks
 description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
     - Disks are considered in ascending alphanumeric sorted order.
     - Disks that meet all conditions are considered 'empty' and returned (using kernel device name) in a list.
         - 1. No known signatures exist on the disk, with the exception of partition tables.
@@ -15,18 +20,18 @@ description:
     - Number of returned disks defaults to first 10, but can be specified with 'max_return' argument.
 author: Eda Zhou (@edamamez)
 options:
-    option-name: max_return
-    description: Sets the maximum number of unused disks to return.
-    default: 10
-    type: int
-
-    option-name: min_size
-    description: Specifies the minimum disk size to return an unused disk.
-    default: 0
-    type: str
-'''
-
-EXAMPLES = '''
+    max_return:
+        description: Sets the maximum number of unused disks to return.
+        default: 10
+        type: int
+
+    min_size:
+        description: Specifies the minimum disk size to return an unused disk.
+        default: 0
+        type: str
+"""
+
+EXAMPLES = """
 - name: test finding first unused device module
   hosts: localhost
   tasks:
@@ -38,9 +43,9 @@ EXAMPLES = '''
     - name: dump test output
       debug:
         msg: '{{ testout }}'
-'''
+"""
 
-RETURN = '''
+RETURN = """
 disk_name:
     description: Information about unused disks
     returned: On success
@@ -50,14 +55,15 @@ disk_name:
             description: Unused disk(s) that have been found
             returned: On success
             type: list
-            samples: ["sda1", "dm-0", "dm-3"]
-                     ["sda"]
+            samples: |
+              ["sda1", "dm-0", "dm-3"]
+              ["sda"]
         none:
             description: No unused disks were found
             returned: On success
             type: string
             sample: "Unable to find unused disk"
-'''
+"""
 
 
 import os
@@ -68,7 +74,7 @@ from ansible.module_utils.storage_lsr.size import Size
 
 
 SYS_CLASS_BLOCK = "/sys/class/block/"
-IGNORED_DEVICES = [re.compile(r'^/dev/nullb\d+$')]
+IGNORED_DEVICES = [re.compile(r"^/dev/nullb\d+$")]
 
 
 def is_ignored(disk_path):
@@ -78,13 +84,13 @@ def is_ignored(disk_path):
 
 def no_signature(run_command, disk_path):
     """Return true if no known signatures exist on the disk."""
-    signatures = run_command(['blkid', '-p', disk_path])
-    return not 'UUID' in signatures[1]
+    signatures = run_command(["blkid", "-p", disk_path])
+    return "UUID" not in signatures[1]
 
 
 def no_holders(disk_path):
     """Return true if the disk has no holders."""
-    holders = os.listdir(SYS_CLASS_BLOCK + get_sys_name(disk_path) + '/holders/')
+    holders = os.listdir(SYS_CLASS_BLOCK + get_sys_name(disk_path) + "/holders/")
     return len(holders) == 0
 
 
@@ -101,36 +107,45 @@ def get_sys_name(disk_path):
     if not os.path.islink(disk_path):
         return os.path.basename(disk_path)
 
-    node_dir = '/'.join(disk_path.split('/')[-1])
-    return os.path.normpath(node_dir + '/' + os.readlink(disk_path))
+    node_dir = "/".join(disk_path.split("/")[-1])
+    return os.path.normpath(node_dir + "/" + os.readlink(disk_path))
 
 
 def get_partitions(disk_path):
     sys_name = get_sys_name(disk_path)
     partitions = list()
     for filename in os.listdir(SYS_CLASS_BLOCK + sys_name):
-        if re.match(sys_name + r'p?\d+$', filename):
+        if re.match(sys_name + r"p?\d+$", filename):
             partitions.append(filename)
 
     return partitions
 
 
 def get_disks(run_command):
-    buf = run_command(["lsblk", "-p", "--pairs", "--bytes", "-o", "NAME,TYPE,SIZE,FSTYPE"])[1]
+    buf = run_command(
+        ["lsblk", "-p", "--pairs", "--bytes", "-o", "NAME,TYPE,SIZE,FSTYPE"]
+    )[1]
     disks = dict()
     for line in buf.splitlines():
         if not line:
             continue
 
-        m = re.search(r'NAME="(?P<path>[^"]*)" TYPE="(?P<type>[^"]*)" SIZE="(?P<size>\d+)" FSTYPE="(?P<fstype>[^"]*)"', line)
+        m = re.search(
+            r'NAME="(?P<path>[^"]*)" TYPE="(?P<type>[^"]*)" SIZE="(?P<size>\d+)" FSTYPE="(?P<fstype>[^"]*)"',
+            line,
+        )
         if m is None:
             print(line)
             continue
 
-        if m.group('type') != "disk":
+        if m.group("type") != "disk":
             continue
 
-        disks[m.group('path')] = {"type": m.group('type'), "size": m.group('size'), "fstype": m.group('fstype')}
+        disks[m.group("path")] = {
+            "type": m.group("type"),
+            "size": m.group("size"),
+            "fstype": m.group("fstype"),
+        }
 
     return disks
 
@@ -138,19 +153,13 @@ def get_disks(run_command):
 def run_module():
     """Create the module"""
     module_args = dict(
-        max_return=dict(type='int', required=False, default=10),
-        min_size=dict(type='str', required=False, default=0)
+        max_return=dict(type="int", required=False, default=10),
+        min_size=dict(type="str", required=False, default=0),
     )
 
-    result = dict(
-        changed=False,
-        disks=[]
-    )
+    result = dict(changed=False, disks=[])
 
-    module = AnsibleModule(
-        argument_spec=module_args,
-        supports_check_mode=True
-    )
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
     run_command = module.run_command
 
@@ -161,7 +170,7 @@ def run_module():
         if attrs["fstype"]:
             continue
 
-        if Size(attrs["size"]).bytes < Size(module.params['min_size']).bytes:
+        if Size(attrs["size"]).bytes < Size(module.params["min_size"]).bytes:
             continue
 
         if get_partitions(path):
@@ -173,14 +182,14 @@ def run_module():
         if not can_open(path):
             continue
 
-        result['disks'].append(os.path.basename(path))
-        if len(result['disks']) >= module.params['max_return']:
+        result["disks"].append(os.path.basename(path))
+        if len(result["disks"]) >= module.params["max_return"]:
             break
 
-    if not result['disks']:
-        result['disks'] = "Unable to find unused disk"
+    if not result["disks"]:
+        result["disks"] = "Unable to find unused disk"
     else:
-        result['disks'].sort()
+        result["disks"].sort()
 
     module.exit_json(**result)
 
@@ -190,5 +199,5 @@ def main():
     run_module()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()
diff --git a/library/lvm_gensym.py b/library/lvm_gensym.py
index 49d1822..3e0f613 100644
--- a/library/lvm_gensym.py
+++ b/library/lvm_gensym.py
@@ -1,66 +1,75 @@
 #!/usr/bin/python
 """Generates unique, default names for a volume group and logical volume"""
 
-from ansible.module_utils.basic import AnsibleModule
-from ansible.module_utils import facts
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
 
 ANSIBLE_METADATA = {
-    'metadata_version': '1.1',
-    'status': ['preview'],
-    'supported_by': 'community'
+    "metadata_version": "1.1",
+    "status": ["preview"],
+    "supported_by": "community",
 }
 
-DOCUMENTATION = '''
+DOCUMENTATION = """
 ---
 module: lvm_gensym
 short_description: Generate default names for lvm variables
 version_added: "2.4"
-description: 
-    - "Module accepts two input strings consisting of a file system type and 
+description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
+    - "Module accepts two input strings consisting of a file system type and
        a mount point path, and outputs names based on system information"
 options:
     fs_type:
         description:
-            - String describing the desired file system type 
-        required: true 
+            - String describing the desired file system type
+        required: true
+        type: str
     mount:
         description:
-            - String describing the mount point path 
+            - String describing the mount point path
         required: true
-author: 
-    - Tim Flannagan (tflannag@redhat.com)
-'''
+        type: str
+author:
+    - Tim Flannagan (@timflannagan)
+"""
 
-EXAMPLES = '''
-- name: Generate names 
+EXAMPLES = """
+- name: Generate names
   lvm_gensym:
     fs_type: "{{ fs_type }}"
     mount: "{{ mount_point }}"
   register: lvm_results
   when: lvm_vg == "" and mount_point != "" and fs_type != ""
-'''
+"""
 
-RETURN = '''
+RETURN = """
 vg_name:
     description: The default generated name for an unspecified volume group
     type: str
-
+    returned: success
 lv_name:
     description: The default generated name for an unspecified logical volume
     type: str
-'''
+    returned: success
+"""
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils import facts
 
 
 def get_os_name():
     """Search the host file and return the name in the ID column"""
-    for line in open('/etc/os-release').readlines():
-        if not line.find('ID='):
+    for line in open("/etc/os-release").readlines():
+        if not line.find("ID="):
             os_name = line[3:]
             break
 
-    os_name = os_name.replace('\n', '').replace('"', '')
+    os_name = os_name.replace("\n", "").replace('"', "")
     return os_name
 
+
 def name_is_unique(name, used_names):
     """Check if name is contained in the used_names list and return boolean value"""
     if name not in used_names:
@@ -68,14 +77,15 @@ def name_is_unique(name, used_names):
 
     return False
 
+
 def get_unique_name_from_base(base_name, used_names):
     """Generate a unique name given a base name and a list of used names, and return that unique name"""
     counter = 0
     while not name_is_unique(base_name, used_names):
         if counter == 0:
-            base_name = base_name + '_' + str(counter)
+            base_name = base_name + "_" + str(counter)
         else:
-            base_name = base_name[:-2] + '_' + str(counter)
+            base_name = base_name[:-2] + "_" + str(counter)
         counter += 1
 
     return base_name
@@ -83,8 +93,8 @@ def get_unique_name_from_base(base_name, used_names):
 
 def get_vg_name_base(host_name, os_name):
     """Return a base name for a volume group based on the host and os names"""
-    if host_name != None and len(host_name) != 0:
-        vg_default = os_name + '_' + host_name
+    if host_name is not None and len(host_name) != 0:
+        vg_default = os_name + "_" + host_name
     else:
         vg_default = os_name
 
@@ -93,65 +103,68 @@ def get_vg_name_base(host_name, os_name):
 
 def get_vg_name(host_name, lvm_facts):
     """Generate a base volume group name, verify its uniqueness, and return that unique name"""
-    used_vg_names = lvm_facts['vgs'].keys()
+    used_vg_names = lvm_facts["vgs"].keys()
     os_name = get_os_name()
     name = get_vg_name_base(host_name, os_name)
 
     return get_unique_name_from_base(name, used_vg_names)
 
+
 def get_lv_name_base(fs_type, mount_point):
     """Return a logical volume base name using given parameters"""
-    if 'swap' in fs_type.lower():
-        lv_default = 'swap'
-    elif mount_point.startswith('/'):
-        if mount_point == '/':
-            lv_default = 'root'
+    if "swap" in fs_type.lower():
+        lv_default = "swap"
+    elif mount_point.startswith("/"):
+        if mount_point == "/":
+            lv_default = "root"
         else:
-            lv_default = mount_point[1:].replace('/', '_')
+            lv_default = mount_point[1:].replace("/", "_")
     else:
-        lv_default = 'lv'
+        lv_default = "lv"
 
     return lv_default
 
 
 def get_lv_name(fs_type, mount_point, lvm_facts):
     """Return a unique logical volume name based on specified file system type, mount point, and system facts"""
-    used_lv_names = lvm_facts['lvs'].keys()
+    used_lv_names = lvm_facts["lvs"].keys()
     name = get_lv_name_base(fs_type, mount_point)
 
     return get_unique_name_from_base(name, used_lv_names)
 
+
 def run_module():
     """Setup and initialize all relevant ansible module data"""
     module_args = dict(
-        mount=dict(type='str', required=True),
-        fs_type=dict(type='str', required=True)
+        mount=dict(type="str", required=True), fs_type=dict(type="str", required=True)
     )
 
-    result = dict(
-        changed=False,
-        vg_name='',
-        lv_name=''
-    )
+    result = dict(changed=False, vg_name="", lv_name="")
 
-    module = AnsibleModule(
-        argument_spec=module_args,
-        supports_check_mode=True
-    )
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
-    lvm_facts = facts.ansible_facts(module)['lvm']
-    host_name = facts.ansible_facts(module)['nodename'].lower().replace('.', '_').replace('-', '_')
+    lvm_facts = facts.ansible_facts(module)["lvm"]
+    host_name = (
+        facts.ansible_facts(module)["nodename"]
+        .lower()
+        .replace(".", "_")
+        .replace("-", "_")
+    )
 
-    result['lv_name'] = get_lv_name(module.params['fs_type'], module.params['mount'], lvm_facts)
-    result['vg_name'] = get_vg_name(host_name, lvm_facts)
+    result["lv_name"] = get_lv_name(
+        module.params["fs_type"], module.params["mount"], lvm_facts
+    )
+    result["vg_name"] = get_vg_name(host_name, lvm_facts)
 
-    if result['lv_name'] != '' and result['vg_name'] != '':
+    if result["lv_name"] != "" and result["vg_name"] != "":
         module.exit_json(**result)
     else:
         module.fail_json(msg="Unable to initialize both group and volume names")
 
+
 def main():
     run_module()
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     main()
diff --git a/library/resolve_blockdev.py b/library/resolve_blockdev.py
index 007bb28..df9dcb1 100644
--- a/library/resolve_blockdev.py
+++ b/library/resolve_blockdev.py
@@ -1,17 +1,22 @@
 #!/usr/bin/python
 
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 ANSIBLE_METADATA = {
-    'metadata_version': '1.1',
-    'status': ['preview'],
-    'supported_by': 'community'
+    "metadata_version": "1.1",
+    "status": ["preview"],
+    "supported_by": "community",
 }
 
-DOCUMENTATION = '''
+DOCUMENTATION = """
 ---
 module: resolve_blockdev
 short_description: Resolve block device specification to device node path.
 version_added: "2.5"
 description:
+    - "WARNING: Do not use this module directly! It is only for role internal use."
     - "This module accepts various forms of block device identifiers and
        resolves them to the correct block device node path."
 options:
@@ -19,11 +24,12 @@ options:
         description:
             - String describing a block device
         required: true
+        type: str
 author:
-    - David Lehman (dlehman@redhat.com)
-'''
+    - David Lehman (@dwlehman)
+"""
 
-EXAMPLES = '''
+EXAMPLES = """
 - name: Resolve device by label
   resolve_blockdev:
     spec: LABEL=MyData
@@ -35,13 +41,14 @@ EXAMPLES = '''
 - name: Resolve device by /dev/disk/by-id symlink name
   resolve_blockdev:
     spec: wwn-0x5000c5005bc37f3f
-'''
+"""
 
-RETURN = '''
+RETURN = """
 device:
     description: Path to block device node
     type: str
-'''
+    returned: success
+"""
 
 import glob
 import os
@@ -52,37 +59,42 @@ from ansible.module_utils.basic import AnsibleModule
 DEV_MD = "/dev/md"
 DEV_MAPPER = "/dev/mapper"
 SYS_CLASS_BLOCK = "/sys/class/block"
-SEARCH_DIRS = ['/dev', DEV_MAPPER, DEV_MD] + glob.glob("/dev/disk/by-*")
-MD_KERNEL_DEV = re.compile(r'/dev/md\d+(p\d+)?$')
+SEARCH_DIRS = ["/dev", DEV_MAPPER, DEV_MD] + glob.glob("/dev/disk/by-*")
+MD_KERNEL_DEV = re.compile(r"/dev/md\d+(p\d+)?$")
 
 
 def resolve_blockdev(spec, run_cmd):
     if "=" in spec:
         device = run_cmd("blkid -t %s -o device" % spec)[1].strip()
-    elif not spec.startswith('/'):
+    elif not spec.startswith("/"):
         for devdir in SEARCH_DIRS:
             device = "%s/%s" % (devdir, spec)
             if os.path.exists(device):
                 break
             else:
-                device = ''
+                device = ""
     else:
         device = spec
 
     if not device or not os.path.exists(device):
-        return ''
+        return ""
 
     return canonical_device(os.path.realpath(device))
 
 
 def _get_dm_name_from_kernel_dev(kdev):
-    return open("%s/%s/dm/name" % (SYS_CLASS_BLOCK, os.path.basename(kdev))).read().strip()
+    return (
+        open("%s/%s/dm/name" % (SYS_CLASS_BLOCK, os.path.basename(kdev))).read().strip()
+    )
 
 
 def _get_md_name_from_kernel_dev(kdev):
     minor = os.minor(os.stat(kdev).st_rdev)
-    return next(name for name in os.listdir(DEV_MD)
-                if os.minor(os.stat("%s/%s" % (DEV_MD, name)).st_rdev) == minor)
+    return next(
+        name
+        for name in os.listdir(DEV_MD)
+        if os.minor(os.stat("%s/%s" % (DEV_MD, name)).st_rdev) == minor
+    )
 
 
 def canonical_device(device):
@@ -94,26 +106,27 @@ def canonical_device(device):
 
 
 def run_module():
-    module_args = dict(
-        spec=dict(type='str')
-    )
+    module_args = dict(spec=dict(type="str"))
 
     result = dict(
         device=None,
     )
 
-    module = AnsibleModule(
-        argument_spec=module_args,
-        supports_check_mode=True
-    )
+    module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
     try:
-        result['device'] = resolve_blockdev(module.params['spec'], run_cmd=module.run_command)
+        result["device"] = resolve_blockdev(
+            module.params["spec"], run_cmd=module.run_command
+        )
     except Exception:
         pass
 
-    if not result['device'] or not os.path.exists(result['device']):
-        module.fail_json(msg="The {} device spec could not be resolved".format(module.params['spec']))
+    if not result["device"] or not os.path.exists(result["device"]):
+        module.fail_json(
+            msg="The {0} device spec could not be resolved".format(
+                module.params["spec"]
+            )
+        )
 
     module.exit_json(**result)
 
@@ -122,5 +135,5 @@ def main():
     run_module()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()
diff --git a/module_utils/storage_lsr/size.py b/module_utils/storage_lsr/size.py
index 16f3d7c..1e91faa 100644
--- a/module_utils/storage_lsr/size.py
+++ b/module_utils/storage_lsr/size.py
@@ -1,4 +1,6 @@
-#!/bin/python2
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
 
 import re
 
@@ -7,15 +9,20 @@ BINARY_FACTOR = 2 ** 10
 
 # index of the item in the list determines the exponent for size computation
 # e.g. size_in_bytes = value * (DECIMAL_FACTOR ** (index(mega)+1)) = value * (1000 ** (1+1))
-PREFIXES_DECIMAL = [["k",    "M",    "G",    "T",    "P",    "E",    "Z",     "Y"],
-                    ["kilo", "mega", "giga", "tera", "peta", "exa",  "zetta", "yotta"]]
-PREFIXES_BINARY  = [["Ki",   "Mi",   "Gi",   "Ti",   "Pi",   "Ei",   "Zi",    "Yi"],
-                    ["kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi",  "yobi"]]
+# pylint: disable=bad-whitespace
+PREFIXES_DECIMAL = [
+    ["k", "M", "G", "T", "P", "E", "Z", "Y"],  # nopep8
+    ["kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta"],
+]  # nopep8
+PREFIXES_BINARY = [
+    ["Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi"],  # nopep8
+    ["kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi", "yobi"],
+]  # nopep8
 SUFFIXES = ["bytes", "byte", "B"]
 
+
 class Size(object):
-    ''' Class for basic manipulation of the sizes in *bytes
-    '''
+    """Class for basic manipulation of the sizes in *bytes"""
 
     def __init__(self, value):
         raw_number, raw_units = self._parse_input(str(value))
@@ -25,9 +32,9 @@ class Size(object):
         self.units = raw_units
 
     def _parse_input(self, value):
-        ''' splits input string into number and unit parts
-            returns number part, unit part
-        '''
+        """splits input string into number and unit parts
+        returns number part, unit part
+        """
         m = re.search("^(.*?)([^0-9]*)$", value)
 
         raw_number = m.group(1).strip()
@@ -39,12 +46,12 @@ class Size(object):
         return raw_number, raw_units
 
     def _parse_units(self, raw_units):
-        '''
-            gets string containing size units and
-            returns *_FACTOR (BINARY or DECIMAL) and the prefix position (not index!)
-            in the PREFIXES_* list
-            If no unit is specified defaults to BINARY and Bytes
-        '''
+        """
+        gets string containing size units and
+        returns *_FACTOR (BINARY or DECIMAL) and the prefix position (not index!)
+        in the PREFIXES_* list
+        If no unit is specified defaults to BINARY and Bytes
+        """
 
         prefix = raw_units
         no_suffix_flag = True
@@ -54,7 +61,7 @@ class Size(object):
         for suffix in SUFFIXES:
             if raw_units.lower().endswith(suffix.lower()):
                 no_suffix_flag = False
-                prefix = raw_units[:-len(suffix)]
+                prefix = raw_units[: -len(suffix)]
                 break
 
         if prefix == "":
@@ -87,18 +94,18 @@ class Size(object):
         if idx < 0 or not valid_suffix:
             raise ValueError("Unable to identify unit '%s'" % raw_units)
 
-        return used_factor, idx+1
+        return used_factor, idx + 1
 
     def _parse_number(self, raw_number):
-        ''' parse input string containing number
-            return float
-        '''
+        """parse input string containing number
+        return float
+        """
         return float(raw_number)
 
     def _get_unit(self, factor, exponent, unit_type=0):
-        ''' based on decimal or binary factor and exponent
-            obtain and return correct unit
-        '''
+        """based on decimal or binary factor and exponent
+        obtain and return correct unit
+        """
 
         if unit_type == 0:
             suffix = "B"
@@ -112,12 +119,11 @@ class Size(object):
             prefix_lst = PREFIXES_DECIMAL[unit_type]
         else:
             prefix_lst = PREFIXES_BINARY[unit_type]
-        return prefix_lst[exponent-1] + suffix
+        return prefix_lst[exponent - 1] + suffix
 
     @property
     def bytes(self):
-        ''' returns size value in bytes as int
-        '''
+        """returns size value in bytes as int"""
         return int((self.factor ** self.exponent) * self.number)
 
     def _format(self, format_str, factor, exponent):
@@ -129,20 +135,20 @@ class Size(object):
         return result
 
     def get(self, units="autobin", fmt="%0.1f %sb"):
-        ''' returns size value as a string with given units and format
+        """returns size value as a string with given units and format
 
-            "units" parameter allows to select preferred unit:
-                for example "KiB" or "megabytes"
-                accepted values are also:
-                "autobin" (default) - uses the highest human readable unit (binary)
-                "autodec" - uses the highest human readable unit (decimal)
+        "units" parameter allows to select preferred unit:
+            for example "KiB" or "megabytes"
+            accepted values are also:
+            "autobin" (default) - uses the highest human readable unit (binary)
+            "autodec" - uses the highest human readable unit (decimal)
 
-            "fmt" parameter allows to specify the output format:
-                %sb - will be replaced with the short byte size unit (e.g. MiB)
-                %lb - will be replaced with the long byte size unit (e.g. kilobytes)
-                value can be formatted using standard string replacements (e.g. %d, %f)
+        "fmt" parameter allows to specify the output format:
+            %sb - will be replaced with the short byte size unit (e.g. MiB)
+            %lb - will be replaced with the long byte size unit (e.g. kilobytes)
+            value can be formatted using standard string replacements (e.g. %d, %f)
 
-        '''
+        """
 
         ftr = BINARY_FACTOR
         if units == "autodec":
@@ -155,6 +161,8 @@ class Size(object):
                 exp += 1
         else:
             ftr, exp = self._parse_units(units.strip())
-            value = (float(self.factor ** self.exponent) / float(ftr ** exp)) * self.number
+            value = (
+                float(self.factor ** self.exponent) / float(ftr ** exp)
+            ) * self.number
 
         return self._format(fmt, ftr, exp) % value
diff --git a/tests/setup_module_utils.sh b/tests/setup_module_utils.sh
deleted file mode 100755
index 94d102d..0000000
--- a/tests/setup_module_utils.sh
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/bin/bash
-# SPDX-License-Identifier: MIT
-
-set -euo pipefail
-
-if [ -n "${DEBUG:-}" ] ; then
-    set -x
-fi
-
-if [ ! -d "${1:-}" ] ; then
-    echo Either ansible is not installed, or there is no ansible/module_utils
-    echo in "$1" - Skipping
-    exit 0
-fi
-
-if [ ! -d "${2:-}" ] ; then
-    echo Role has no module_utils - Skipping
-    exit 0
-fi
-
-# we need absolute path for $2
-absmoddir=$( readlink -f "$2" )
-
-# clean up old links to module_utils
-for item in "$1"/* ; do
-    if lnitem=$( readlink "$item" ) && test -n "$lnitem" ; then
-        case "$lnitem" in
-            *"${2}"*) rm -f "$item" ;;
-        esac
-    fi
-done
-
-# add new links to module_utils
-for item in "$absmoddir"/* ; do
-    case "$item" in
-        *__pycache__) continue;;
-        *.pyc) continue;;
-    esac
-    bnitem=$( basename "$item" )
-    ln -s "$item" "$1/$bnitem"
-done
diff --git a/tests/test-verify-volume-device.yml b/tests/test-verify-volume-device.yml
index 3fb56a6..c7ba5ec 100644
--- a/tests/test-verify-volume-device.yml
+++ b/tests/test-verify-volume-device.yml
@@ -23,11 +23,11 @@
 
 - name: (1/2) Process volume type (set initial value)
   set_fact:
-      st_volume_type: "{{ storage_test_volume.type }}"
+    st_volume_type: "{{ storage_test_volume.type }}"
 
 - name: (2/2) Process volume type (get RAID value)
   set_fact:
-      st_volume_type: "{{ storage_test_volume.raid_level }}"
+    st_volume_type: "{{ storage_test_volume.raid_level }}"
   when: storage_test_volume.type == "raid"
 
 - name: Verify the volume's device type
diff --git a/tests/test-verify-volume-md.yml b/tests/test-verify-volume-md.yml
index b21d8d2..27e8333 100644
--- a/tests/test-verify-volume-md.yml
+++ b/tests/test-verify-volume-md.yml
@@ -9,7 +9,7 @@
       register: storage_test_mdadm
       changed_when: false
 
-    # pre-chew regex search patterns 
+    # pre-chew regex search patterns
     - set_fact:
         storage_test_md_active_devices_re: "{{ ('Active Devices : ' ~ storage_test_volume.raid_device_count ~ '\n')|regex_escape() }}"
       when: storage_test_volume.raid_device_count is defined
diff --git a/tests/test.yml b/tests/test.yml
index 944b3cd..cb718a7 100644
--- a/tests/test.yml
+++ b/tests/test.yml
@@ -16,7 +16,7 @@
               mount_point: '/opt/test1'
         - name: bar
           disks: ['vdc']
-          #state: "absent"
+          # state: "absent"
           volumes:
             - name: test2
               size: 8g
diff --git a/tests/tests_create_lv_size_equal_to_vg.yml b/tests/tests_create_lv_size_equal_to_vg.yml
index 21a5788..1737036 100644
--- a/tests/tests_create_lv_size_equal_to_vg.yml
+++ b/tests/tests_create_lv_size_equal_to_vg.yml
@@ -23,13 +23,13 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ lv_size }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ lv_size }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -37,12 +37,12 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: "absent"
-              volumes:
-                - name: test1
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: "absent"
+            volumes:
+              - name: test1
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
diff --git a/tests/tests_create_partition_volume_then_remove.yml b/tests/tests_create_partition_volume_then_remove.yml
index 351b022..567f8dd 100644
--- a/tests/tests_create_partition_volume_then_remove.yml
+++ b/tests/tests_create_partition_volume_then_remove.yml
@@ -53,7 +53,7 @@
         name: linux-system-roles.storage
       vars:
         storage_pools:
-          - name:  "{{ unused_disks[0] }}"
+          - name: "{{ unused_disks[0] }}"
             type: partition
             disks: "{{ unused_disks }}"
             state: absent
@@ -70,7 +70,7 @@
         name: linux-system-roles.storage
       vars:
         storage_pools:
-          - name:  "{{ unused_disks[0] }}"
+          - name: "{{ unused_disks[0] }}"
             type: partition
             disks: "{{ unused_disks }}"
             state: absent
diff --git a/tests/tests_existing_lvm_pool.yml b/tests/tests_existing_lvm_pool.yml
index 854ac0d..2490914 100644
--- a/tests/tests_existing_lvm_pool.yml
+++ b/tests/tests_existing_lvm_pool.yml
@@ -20,12 +20,12 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: "{{ pool_name }}"
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ volume_size }}"
+        storage_pools:
+          - name: "{{ pool_name }}"
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ volume_size }}"
 
     - include_tasks: verify-role-results.yml
 
diff --git a/tests/tests_lvm_auto_size_cap.yml b/tests/tests_lvm_auto_size_cap.yml
index fb17c23..8c754a6 100644
--- a/tests/tests_lvm_auto_size_cap.yml
+++ b/tests/tests_lvm_auto_size_cap.yml
@@ -33,12 +33,12 @@
             name: linux-system-roles.storage
           vars:
             storage_pools:
-                - name: foo
-                  type: lvm
-                  disks: "{{ unused_disks }}"
-                  volumes:
-                    - name: test1
-                      size: "{{ doubled_size.stdout|trim }}"
+              - name: foo
+                type: lvm
+                disks: "{{ unused_disks }}"
+                volumes:
+                  - name: test1
+                    size: "{{ doubled_size.stdout|trim }}"
         - name: unreachable task
           fail:
             msg: UNREACH
@@ -56,11 +56,11 @@
         name: linux-system-roles.storage
       vars:
         storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ test_disk_size }}"
+          - name: foo
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ test_disk_size }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -69,12 +69,12 @@
         name: linux-system-roles.storage
       vars:
         storage_pools:
-            - name: foo
-              type: lvm
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ test_disk_size }}"
+          - name: foo
+            type: lvm
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ test_disk_size }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -83,7 +83,7 @@
         name: linux-system-roles.storage
       vars:
         storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: absent
-              volumes: []
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: absent
+            volumes: []
diff --git a/tests/tests_lvm_one_disk_one_volume.yml b/tests/tests_lvm_one_disk_one_volume.yml
index b1096cf..6452f54 100644
--- a/tests/tests_lvm_one_disk_one_volume.yml
+++ b/tests/tests_lvm_one_disk_one_volume.yml
@@ -19,13 +19,13 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ volume_size }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ volume_size }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -33,13 +33,13 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  size: "{{ volume_size }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                size: "{{ volume_size }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -47,14 +47,14 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: absent
-              volumes:
-                - name: test1
-                  size: "{{ volume_size }}"
-                  mount_point: "{{ mount_location }}"
-                  state: absent
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: absent
+            volumes:
+              - name: test1
+                size: "{{ volume_size }}"
+                mount_point: "{{ mount_location }}"
+                state: absent
 
     - include_tasks: verify-role-results.yml
diff --git a/tests/tests_misc.yml b/tests/tests_misc.yml
index 3139bc7..afe753a 100644
--- a/tests/tests_misc.yml
+++ b/tests/tests_misc.yml
@@ -197,7 +197,7 @@
       block:
         - name: Try to mount swap filesystem to "{{  mount_location }}"
           include_role:
-              name: linux-system-roles.storage
+            name: linux-system-roles.storage
           vars:
             storage_volumes:
               - name: test1
diff --git a/tests/tests_null_raid_pool.yml b/tests/tests_null_raid_pool.yml
index 2b7b9f3..5c3c785 100644
--- a/tests/tests_null_raid_pool.yml
+++ b/tests/tests_null_raid_pool.yml
@@ -31,9 +31,9 @@
             raid_level: "null"
             state: present
             volumes:
-            - name: lv1
-              size: "{{ volume1_size }}"
-              mount_point: "{{ mount_location1 }}"
+              - name: lv1
+                size: "{{ volume1_size }}"
+                mount_point: "{{ mount_location1 }}"
 
     - name: get existing raids (after run)
       command: "cat /proc/mdstat"
@@ -52,12 +52,12 @@
             raid_level: "null"
             state: absent
             volumes:
-            - name: lv1
-              size: "{{ volume1_size }}"
-              mount_point: "{{ mount_location1 }}"
+              - name: lv1
+                size: "{{ volume1_size }}"
+                mount_point: "{{ mount_location1 }}"
 
     - name: compare mdstat results
       assert:
         that:
-            - storage_test_mdstat1.stdout == storage_test_mdstat2.stdout
+          - storage_test_mdstat1.stdout == storage_test_mdstat2.stdout
         msg: "Raid created when it should not be"
diff --git a/tests/tests_resize.yml b/tests/tests_resize.yml
index 209d129..4fd8583 100644
--- a/tests/tests_resize.yml
+++ b/tests/tests_resize.yml
@@ -29,16 +29,16 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              type: lvm
-              volumes:
-                - name: test1
-                  # resizing is currently supported only for ext2/3/4
-                  fs_type: 'ext4'
-                  size: "{{ volume_size_before }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            type: lvm
+            volumes:
+              - name: test1
+                # resizing is currently supported only for ext2/3/4
+                fs_type: 'ext4'
+                size: "{{ volume_size_before }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -46,15 +46,15 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              type: lvm
-              disks: "{{ unused_disks }}"
-              volumes:
-                - name: test1
-                  fs_type: 'ext4'
-                  size: "{{ volume_size_after }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            type: lvm
+            disks: "{{ unused_disks }}"
+            volumes:
+              - name: test1
+                fs_type: 'ext4'
+                size: "{{ volume_size_after }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -194,14 +194,14 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: absent
-              volumes:
-                - name: test1
-                  size: "{{ volume_size_before }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: absent
+            volumes:
+              - name: test1
+                size: "{{ volume_size_before }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -259,14 +259,14 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: absent
-              volumes:
-                - name: test1
-                  size: "{{ volume_size_before }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: absent
+            volumes:
+              - name: test1
+                size: "{{ volume_size_before }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
 
@@ -324,13 +324,13 @@
       include_role:
         name: linux-system-roles.storage
       vars:
-          storage_pools:
-            - name: foo
-              disks: "{{ unused_disks }}"
-              state: absent
-              volumes:
-                - name: test1
-                  size: "{{ volume_size_before }}"
-                  mount_point: "{{ mount_location }}"
+        storage_pools:
+          - name: foo
+            disks: "{{ unused_disks }}"
+            state: absent
+            volumes:
+              - name: test1
+                size: "{{ volume_size_before }}"
+                mount_point: "{{ mount_location }}"
 
     - include_tasks: verify-role-results.yml
diff --git a/tests/unit/bsize_test.py b/tests/unit/bsize_test.py
index f88a9c1..fae0f5f 100644
--- a/tests/unit/bsize_test.py
+++ b/tests/unit/bsize_test.py
@@ -1,7 +1,12 @@
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 import pytest
 
 from storage_lsr.size import Size
 
+
 def test_bsize():
     # check failure on incorrect string
     with pytest.raises(ValueError) as e:
diff --git a/tests/unit/gensym_test.py b/tests/unit/gensym_test.py
index 6d164dc..fd00ddf 100644
--- a/tests/unit/gensym_test.py
+++ b/tests/unit/gensym_test.py
@@ -1,68 +1,115 @@
 #!/usr/bin/python
 """This module tests methods defined in the lvm_gensym.py module using the pytest framework"""
-import pytest
-
+from __future__ import absolute_import, division, print_function
 
-import lvm_gensym
+__metaclass__ = type
 
+import pytest
 
-used_lv_names = ['root', 'root_0', 'root_1', 'root_2', 'root_3', 'swap_0', 'swap', 'swap_1']
 
-test_lv_names = [{'fs_type': 'ext', 'mount': '/'},
-                 {'fs_type': 'zfs', 'mount': '/home/user'},
-                 {'fs_type': 'swap', 'mount': ''}
-                ]
+import lvm_gensym
 
-used_vg_names = ['linux_host', 'rhel_user0', 'rhel_0_user']
 
-test_vg_names = ['rhel_user', 'rhel_user_0', 'rhel_user_1',
-                 'rhel_user_2', 'rhel_user_3', 'linux_user',
-                 'fedora_user', 'fedora_user_0', 'fedora_user_1'
-                ]
+used_lv_names = [
+    "root",
+    "root_0",
+    "root_1",
+    "root_2",
+    "root_3",
+    "swap_0",
+    "swap",
+    "swap_1",
+]
+
+test_lv_names = [
+    {"fs_type": "ext", "mount": "/"},
+    {"fs_type": "zfs", "mount": "/home/user"},
+    {"fs_type": "swap", "mount": ""},
+]
+
+used_vg_names = ["linux_host", "rhel_user0", "rhel_0_user"]
+
+test_vg_names = [
+    "rhel_user",
+    "rhel_user_0",
+    "rhel_user_1",
+    "rhel_user_2",
+    "rhel_user_3",
+    "linux_user",
+    "fedora_user",
+    "fedora_user_0",
+    "fedora_user_1",
+]
+
+lvm_facts = {
+    "lvs": {
+        "Home": "",
+        "Swap": "",
+        "Root": "",
+        "Root_0": "",
+        "root": "",
+        "root_0": "",
+        "swap": "",
+        "swap_0": "",
+        "swap_1": "",
+    },
+    "vgs": {"rhel_user": "", "rhel_user_0": "", "rhel_user_1": ""},
+}
 
-lvm_facts = {'lvs': {'Home': '', 'Swap': '', 'Root': '',
-                     'Root_0': '', 'root': '', 'root_0': '',
-                     'swap': '', 'swap_0': '', 'swap_1': '',
-                    },
-             'vgs': {'rhel_user': '', 'rhel_user_0': '', 'rhel_user_1': ''}
-            }
 
 def test_unique_base_name():
     """Test whether the returned name is unique using a supplied list of test names"""
-    assert lvm_gensym.get_unique_name_from_base('root', used_lv_names) == 'root_4'
-    assert lvm_gensym.get_unique_name_from_base('rhel_user', test_vg_names) == 'rhel_user_4'
+    assert lvm_gensym.get_unique_name_from_base("root", used_lv_names) == "root_4"
+    assert (
+        lvm_gensym.get_unique_name_from_base("rhel_user", test_vg_names)
+        == "rhel_user_4"
+    )
+
 
 def test_return_val():
     """Verify that a supplied unique name and a list of used names returns True"""
     for (index, name) in enumerate(test_vg_names):
         assert lvm_gensym.name_is_unique(name[index], used_vg_names)
 
+
 def test_get_base_vg_name():
     """Check generated base volume group name against the expected base name"""
-    assert lvm_gensym.get_vg_name_base('hostname', 'rhel') == 'rhel_hostname'
+    assert lvm_gensym.get_vg_name_base("hostname", "rhel") == "rhel_hostname"
+
 
 @pytest.mark.parametrize("os_name", ["foo", "bar", "baz"])
 def test_vg_eval(monkeypatch, os_name):
     """Check generated unique volume group name against the expected name"""
+
     def get_os_name():
         return os_name
 
     vg_names = [os_name + "_user", os_name + "_user_0", os_name + "_user_1"]
     _lvm_facts = dict(vgs=dict.fromkeys(vg_names), lvs=dict())
     monkeypatch.setattr(lvm_gensym, "get_os_name", get_os_name)
-    assert lvm_gensym.get_vg_name('user', _lvm_facts) == os_name + '_user_2'
-    assert lvm_gensym.get_vg_name('', _lvm_facts) == os_name
+    assert lvm_gensym.get_vg_name("user", _lvm_facts) == os_name + "_user_2"
+    assert lvm_gensym.get_vg_name("", _lvm_facts) == os_name
+
 
 def test_lv_eval():
     """Test the generated unique logical volume name against the expected name"""
-    expected = ['root_1', 'home_user', 'swap_2']
+    expected = ["root_1", "home_user", "swap_2"]
 
     for (ctr, name_inputs) in enumerate(test_lv_names):
-        assert lvm_gensym.get_lv_name(name_inputs['fs_type'], name_inputs['mount'], lvm_facts) == expected[ctr]
+        assert (
+            lvm_gensym.get_lv_name(
+                name_inputs["fs_type"], name_inputs["mount"], lvm_facts
+            )
+            == expected[ctr]
+        )
+
 
 def test_get_base_lv_name():
     """Test the generated base logical volume name against the expected name"""
-    expected = ['root', 'home_user', 'swap']
+    expected = ["root", "home_user", "swap"]
 
     for (ctr, names_input) in enumerate(test_lv_names):
-        assert lvm_gensym.get_lv_name_base(names_input['fs_type'], names_input['mount']) == expected[ctr]
+        assert (
+            lvm_gensym.get_lv_name_base(names_input["fs_type"], names_input["mount"])
+            == expected[ctr]
+        )
diff --git a/tests/unit/resolve_blockdev_test.py b/tests/unit/resolve_blockdev_test.py
index 0eafe7b..ad50628 100644
--- a/tests/unit/resolve_blockdev_test.py
+++ b/tests/unit/resolve_blockdev_test.py
@@ -1,3 +1,6 @@
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
 
 import os
 import pytest
@@ -5,73 +8,80 @@ import pytest
 import resolve_blockdev
 
 
-blkid_data = [('LABEL=target', '/dev/sdx3'),
-              ('UUID=6c75fa75-e5ab-4a12-a567-c8aa0b4b60a5', '/dev/sdaz'),
-              ('LABEL=missing', '')]
+blkid_data = [
+    ("LABEL=target", "/dev/sdx3"),
+    ("UUID=6c75fa75-e5ab-4a12-a567-c8aa0b4b60a5", "/dev/sdaz"),
+    ("LABEL=missing", ""),
+]
 
-path_data = ['/dev/md/unreal',
-             '/dev/mapper/fakevg-fakelv',
-             '/dev/adisk',
-             '/dev/disk/by-id/wwn-0x123456789abc']
+path_data = [
+    "/dev/md/unreal",
+    "/dev/mapper/fakevg-fakelv",
+    "/dev/adisk",
+    "/dev/disk/by-id/wwn-0x123456789abc",
+]
 
-canonical_paths = {"/dev/sda": "/dev/sda",
-                   "/dev/dm-3": "/dev/mapper/vg_system-lv_data",
-                   "/dev/md127": "/dev/md/userdb",
-                   "/dev/notfound": ""}
+canonical_paths = {
+    "/dev/sda": "/dev/sda",
+    "/dev/dm-3": "/dev/mapper/vg_system-lv_data",
+    "/dev/md127": "/dev/md/userdb",
+    "/dev/notfound": "",
+}
 
 
-@pytest.mark.parametrize('spec,device', blkid_data)
+@pytest.mark.parametrize("spec,device", blkid_data)
 def test_key_value_pair(spec, device, monkeypatch):
     def run_cmd(args):
         for _spec, _dev in blkid_data:
             if _spec in args:
                 break
         else:
-            _dev = ''
-        return (0, _dev, '')
+            _dev = ""
+        return (0, _dev, "")
 
-    monkeypatch.setattr(os.path, 'exists', lambda p: True)
+    monkeypatch.setattr(os.path, "exists", lambda p: True)
     assert resolve_blockdev.resolve_blockdev(spec, run_cmd) == device
 
 
-@pytest.mark.parametrize('name', [os.path.basename(p) for p in path_data])
+@pytest.mark.parametrize("name", [os.path.basename(p) for p in path_data])
 def test_device_names(name, monkeypatch):
     """ Test return values for basename specs, assuming all paths are real. """
+
     def path_exists(path):
         return next((data for data in path_data if data == path), False)
 
-    expected = next((data for data in path_data if os.path.basename(data) == name), '')
-    monkeypatch.setattr(os.path, 'exists', path_exists)
+    expected = next((data for data in path_data if os.path.basename(data) == name), "")
+    monkeypatch.setattr(os.path, "exists", path_exists)
     assert resolve_blockdev.resolve_blockdev(name, None) == expected
 
 
 def test_device_name(monkeypatch):
-    assert os.path.exists('/dev/xxx') is False
+    assert os.path.exists("/dev/xxx") is False
 
-    monkeypatch.setattr(os.path, 'exists', lambda p: True)
-    assert resolve_blockdev.resolve_blockdev('xxx', None) == '/dev/xxx'
+    monkeypatch.setattr(os.path, "exists", lambda p: True)
+    assert resolve_blockdev.resolve_blockdev("xxx", None) == "/dev/xxx"
 
-    monkeypatch.setattr(os.path, 'exists', lambda p: False)
-    assert resolve_blockdev.resolve_blockdev('xxx', None) == ''
+    monkeypatch.setattr(os.path, "exists", lambda p: False)
+    assert resolve_blockdev.resolve_blockdev("xxx", None) == ""
 
 
 def test_full_path(monkeypatch):
     path = "/dev/idonotexist"
-    monkeypatch.setattr(os.path, 'exists', lambda p: True)
+    monkeypatch.setattr(os.path, "exists", lambda p: True)
     assert resolve_blockdev.resolve_blockdev(path, None) == path
 
-    monkeypatch.setattr(os.path, 'exists', lambda p: False)
-    assert resolve_blockdev.resolve_blockdev(path, None) == ''
+    monkeypatch.setattr(os.path, "exists", lambda p: False)
+    assert resolve_blockdev.resolve_blockdev(path, None) == ""
 
     path = "/dev/disk/by-label/alabel"
-    monkeypatch.setattr(os.path, 'exists', lambda p: True)
+    monkeypatch.setattr(os.path, "exists", lambda p: True)
     assert resolve_blockdev.resolve_blockdev(path, None) == path
 
-    monkeypatch.setattr(os.path, 'exists', lambda p: False)
-    assert resolve_blockdev.resolve_blockdev(path, None) == ''
+    monkeypatch.setattr(os.path, "exists", lambda p: False)
+    assert resolve_blockdev.resolve_blockdev(path, None) == ""
 
 
-@pytest.mark.parametrize('device', list(canonical_paths.keys()))
+@pytest.mark.parametrize("device", list(canonical_paths.keys()))
 def test_canonical_path(device, monkeypatch):
     def _get_name(device):
         name = os.path.basename(canonical_paths[device])
@@ -79,8 +89,8 @@ def test_canonical_path(device, monkeypatch):
             raise Exception("failed to find name")
         return name
 
-    monkeypatch.setattr(resolve_blockdev, '_get_dm_name_from_kernel_dev', _get_name)
-    monkeypatch.setattr(resolve_blockdev, '_get_md_name_from_kernel_dev', _get_name)
+    monkeypatch.setattr(resolve_blockdev, "_get_dm_name_from_kernel_dev", _get_name)
+    monkeypatch.setattr(resolve_blockdev, "_get_md_name_from_kernel_dev", _get_name)
 
     canonical = canonical_paths[device]
     if canonical:
diff --git a/tests/unit/test_unused_disk.py b/tests/unit/test_unused_disk.py
index a4339c4..493b4b0 100644
--- a/tests/unit/test_unused_disk.py
+++ b/tests/unit/test_unused_disk.py
@@ -1,72 +1,91 @@
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
 import pytest
 import find_unused_disk
 import os
 
 
-blkid_data_pttype = [('/dev/sdx', '/dev/sdx: PTTYPE=\"dos\"'),
-                     ('/dev/sdy', '/dev/sdy: PTTYPE=\"test\"')]
+blkid_data_pttype = [
+    ("/dev/sdx", '/dev/sdx: PTTYPE="dos"'),
+    ("/dev/sdy", '/dev/sdy: PTTYPE="test"'),
+]
 
-blkid_data = [('/dev/sdx', 'UUID=\"hello-1234-56789\" TYPE=\"crypto_LUKS\"'),
-              ('/dev/sdy', 'UUID=\"this-1s-a-t3st-f0r-ansible\" VERSION=\"LVM2 001\" TYPE=\"LVM2_member\" USAGE=\"raid\"'),
-              ('/dev/sdz', 'LABEL=\"/data\" UUID=\"a12bcdef-345g-67h8-90i1-234j56789k10\" VERSION=\"1.0\" TYPE=\"ext4\" USAGE=\"filesystem\"')]
+blkid_data = [
+    ("/dev/sdx", 'UUID="hello-1234-56789" TYPE="crypto_LUKS"'),
+    (
+        "/dev/sdy",
+        'UUID="this-1s-a-t3st-f0r-ansible" VERSION="LVM2 001" TYPE="LVM2_member" USAGE="raid"',
+    ),
+    (
+        "/dev/sdz",
+        'LABEL="/data" UUID="a12bcdef-345g-67h8-90i1-234j56789k10" VERSION="1.0" TYPE="ext4" USAGE="filesystem"',
+    ),
+]
 
-holders_data_none = [('/dev/sdx', ''),
-                     ('/dev/dm-99', '')]
+holders_data_none = [("/dev/sdx", ""), ("/dev/dm-99", "")]
 
-holders_data = [('/dev/sdx', 'dm-0'),
-                ('/dev/dm-99', 'dm-2 dm-3 dm-4')]
+holders_data = [("/dev/sdx", "dm-0"), ("/dev/dm-99", "dm-2 dm-3 dm-4")]
 
 
-@pytest.mark.parametrize('disk, blkid', blkid_data_pttype)
+@pytest.mark.parametrize("disk, blkid", blkid_data_pttype)
 def test_no_signature_true(disk, blkid):
     def run_command(args):
-        return [0, blkid, '']
+        return [0, blkid, ""]
+
     assert find_unused_disk.no_signature(run_command, disk) is True
 
 
-@pytest.mark.parametrize('disk, blkid', blkid_data)
+@pytest.mark.parametrize("disk, blkid", blkid_data)
 def test_no_signature_false(disk, blkid):
     def run_command(args):
-        return [0, blkid, '']
+        return [0, blkid, ""]
+
     assert find_unused_disk.no_signature(run_command, disk) is False
 
 
-@pytest.mark.parametrize('disk, holders', holders_data_none)
+@pytest.mark.parametrize("disk, holders", holders_data_none)
 def test_no_holders_true(disk, holders, monkeypatch):
     def mock_return(args):
         return holders
-    monkeypatch.setattr(os, 'listdir', mock_return)
+
+    monkeypatch.setattr(os, "listdir", mock_return)
     assert find_unused_disk.no_holders(disk) is True
 
 
-@pytest.mark.parametrize('disk, holders', holders_data)
+@pytest.mark.parametrize("disk, holders", holders_data)
 def test_no_holders_false(disk, holders, monkeypatch):
     def mock_return(args):
         return holders
-    monkeypatch.setattr(os, 'listdir', mock_return)
+
+    monkeypatch.setattr(os, "listdir", mock_return)
     assert find_unused_disk.no_holders(disk) is False
 
 
 def test_can_open_true(monkeypatch):
     def mock_return(args, flag):
         return True
-    monkeypatch.setattr(os, 'open', mock_return)
-    assert find_unused_disk.can_open('/hello') is True
+
+    monkeypatch.setattr(os, "open", mock_return)
+    assert find_unused_disk.can_open("/hello") is True
 
 
 def test_can_open_false(monkeypatch):
     def mock_return(args, flag):
         raise OSError
-    monkeypatch.setattr(os, 'open', mock_return)
-    assert find_unused_disk.can_open('/hello') is False
+
+    monkeypatch.setattr(os, "open", mock_return)
+    assert find_unused_disk.can_open("/hello") is False
 
 
 def test_is_ignored(monkeypatch):
     def mock_realpath(path):
         return path
-    monkeypatch.setattr(os.path, 'realpath', mock_realpath)
-    assert find_unused_disk.is_ignored('/dev/sda') is False
-    assert find_unused_disk.is_ignored('/dev/vda') is False
-    assert find_unused_disk.is_ignored('/dev/mapper/mpatha') is False
-    assert find_unused_disk.is_ignored('/dev/md/Volume0') is False
-    assert find_unused_disk.is_ignored('/dev/nullb0') is True
+
+    monkeypatch.setattr(os.path, "realpath", mock_realpath)
+    assert find_unused_disk.is_ignored("/dev/sda") is False
+    assert find_unused_disk.is_ignored("/dev/vda") is False
+    assert find_unused_disk.is_ignored("/dev/mapper/mpatha") is False
+    assert find_unused_disk.is_ignored("/dev/md/Volume0") is False
+    assert find_unused_disk.is_ignored("/dev/nullb0") is True
diff --git a/tox.ini b/tox.ini
index 92482d5..91c22a8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,9 +13,3 @@ configfile = .ansible-lint
 setenv =
     RUN_PYTEST_SETUP_MODULE_UTILS = true
     RUN_PYLINT_SETUP_MODULE_UTILS = true
-
-[testenv:black]
-commands = bash -c 'echo black is currently not enabled - please fix this'
-
-[testenv:flake8]
-commands = bash -c 'echo flake8 is currently not enabled - please fix this'
-- 
2.30.2