From 4584826e9a25fdddb876f07875423196d9fc8840 Mon Sep 17 00:00:00 2001

From: Harald Hoyer <harald@redhat.com>

Date: Mon, 7 Oct 2013 15:06:22 +0200

Subject: [PATCH] rootfs-block: add support for the rootfallback= kernel

 cmdline option

---

 dracut.cmdline.7.asc                     |  6 ++++

 modules.d/95rootfs-block/module-setup.sh |  3 +-

 modules.d/95rootfs-block/rootfallback.sh | 46 ++++++++++++++++++++++++

 3 files changed, 54 insertions(+), 1 deletion(-)

 create mode 100755 modules.d/95rootfs-block/rootfallback.sh

diff --git a/dracut.cmdline.7.asc b/dracut.cmdline.7.asc

index 09c47e85..4b2ab035 100644

--- a/dracut.cmdline.7.asc

+++ b/dracut.cmdline.7.asc

@@ -69,6 +69,12 @@ rootfstype=ext3

     force mounting _/_ and _/usr_ (if it is a separate device) read-write.

     See also ro option.

+**rootfallback=**_<path to blockdevice>_::

+    specify the block device to use as the root filesystem, if the normal root cannot be found.

+    This can only be a simple block device with a simple file system, for which the filesystem

+    driver is either compiled in, or added manually to the initramfs.

+    This parameter can be specified multiple times.

+

 **rd.auto** **rd.auto=1**::

     enable autoassembly of special devices like cryptoLUKS, dmraid, mdraid or lvm.

     Default is off as of dracut version >= 024.

diff --git a/modules.d/95rootfs-block/module-setup.sh b/modules.d/95rootfs-block/module-setup.sh

index f066a79c..7e714eb0 100755

--- a/modules.d/95rootfs-block/module-setup.sh

+++ b/modules.d/95rootfs-block/module-setup.sh

@@ -44,5 +44,6 @@ install() {

         inst_hook pre-udev 30 "$moddir/block-genrules.sh"

         inst_hook mount 99 "$moddir/mount-root.sh"

     fi

-}

+    inst_hook initqueue/timeout 99 "$moddir/rootfallback.sh"

+}

diff --git a/modules.d/95rootfs-block/rootfallback.sh b/modules.d/95rootfs-block/rootfallback.sh

new file mode 100755

index 00000000..246ce9a4

--- /dev/null

+++ b/modules.d/95rootfs-block/rootfallback.sh

@@ -0,0 +1,46 @@

+#!/bin/sh

+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-

+# ex: ts=8 sw=4 sts=4 et filetype=sh

+

+type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh

+

+for root in $(getargs rootfallback=); do

+    case "$root" in

+        block:LABEL=*|LABEL=*)

+            root="${root#block:}"

+            root="$(echo $root | sed 's,/,\\x2f,g')"

+            root="/dev/disk/by-label/${root#LABEL=}"

+            ;;

+        block:UUID=*|UUID=*)

+            root="${root#block:}"

+            root="${root#UUID=}"

+            root="$(echo $root | tr "[:upper:]" "[:lower:]")"

+            root="/dev/disk/by-uuid/${root#UUID=}"

+            ;;

+        block:PARTUUID=*|PARTUUID=*)

+            root="${root#block:}"

+            root="${root#PARTUUID=}"

+            root="$(echo $root | tr "[:upper:]" "[:lower:]")"

+            root="/dev/disk/by-partuuid/${root}"

+            ;;

+        block:PARTLABEL=*|PARTLABEL=*)

+            root="${root#block:}"

+            root="/dev/disk/by-partlabel/${root#PARTLABEL=}"

+            ;;

+    esac

+

+    if ! [ -b "$root" ]; then

+        warn "Could not find rootfallback $root"

+        continue

+    fi

+

+    if mount "$root" /sysroot; then

+        info "Mounted rootfallback $root"

+        exit 0

+    else

+        warn "Failed to mount rootfallback $root"

+        exit 1

+    fi

+done

+

+[ -e "$job" ] && rm -f "$job"