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From 38cc67385fb1b36aa0881bc5982bc58d75dac464 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Hr=C3=A1zk=C3=BD?= <lhrazky@redhat.com>
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Date: Wed, 11 Nov 2020 18:45:11 +0100
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Subject: [PATCH] Package: add a get_header() method (RhBug:1876606)
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Adds get_header() method to the Package class, which returns the rpm
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header of an installed package.
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= changelog =
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msg: Add get_header() method to the Package class
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type: enhancement
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resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1876606
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---
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dnf/package.py | 24 ++++++++++++++++++++++++
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tests/test_package.py | 12 ++++++++++++
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2 files changed, 36 insertions(+)
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diff --git a/dnf/package.py b/dnf/package.py
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index baef04fa5b..836e0e4989 100644
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--- a/dnf/package.py
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+++ b/dnf/package.py
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@@ -26,11 +26,13 @@
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from dnf.i18n import _
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import binascii
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+import dnf.exceptions
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import dnf.rpm
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import dnf.yum.misc
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import hawkey
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import logging
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import os
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+import rpm
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logger = logging.getLogger("dnf")
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@@ -95,6 +97,11 @@ def from_repo(self):
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@property
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def _header(self):
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+ """
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+ Returns the header of a locally present rpm package file. As opposed to
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+ self.get_header(), which retrieves the header of an installed package
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+ from rpmdb.
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+ """
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return dnf.rpm._header(self.localPkg())
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@property
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@@ -164,6 +171,23 @@ def debugsource_name(self):
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src_name = self.source_name if self.source_name is not None else self.name
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return src_name + self.DEBUGSOURCE_SUFFIX
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+ def get_header(self):
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+ """
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+ Returns the rpm header of the package if it is installed. If not
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+ installed, returns None. The header is not cached, it is retrieved from
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+ rpmdb on every call. In case of a failure (e.g. when the rpmdb changes
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+ between loading the data and calling this method), raises an instance
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+ of PackageNotFoundError.
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+ """
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+ if not self._from_system:
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+ return None
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+
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+ try:
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+ # RPMDBI_PACKAGES stands for the header of the package
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+ return next(self.base._ts.dbMatch(rpm.RPMDBI_PACKAGES, self.rpmdbid))
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+ except StopIteration:
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+ raise dnf.exceptions.PackageNotFoundError("Package not found when attempting to retrieve header", str(self))
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+
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@property
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def source_debug_name(self):
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# :api
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diff --git a/tests/test_package.py b/tests/test_package.py
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index cd4872e631..514e5bf099 100644
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--- a/tests/test_package.py
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+++ b/tests/test_package.py
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@@ -68,6 +68,18 @@ def fn_getter():
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with self.assertRaises(IOError):
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pkg._header
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+ # rpm.hdr() is not easy to construct with custom data, we just return a string
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+ # instead, as we don't actually need an instance of rpm.hdr for the test
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+ @mock.patch("rpm.TransactionSet.dbMatch", lambda self, a, b: iter(["package_header_test_data"]))
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+ def test_get_header(self):
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+ pkg = self.sack.query().installed().filter(name="pepper")[0]
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+ header = pkg.get_header()
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+ self.assertEqual(header, "package_header_test_data")
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+
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+ pkg = self.sack.query().available().filter(name="pepper")[0]
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+ header = pkg.get_header()
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+ self.assertEqual(header, None)
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+
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@mock.patch("dnf.package.Package.rpmdbid", long(3))
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def test_idx(self):
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""" pkg.idx is an int. """
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