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-rw-r--r--Improve-btrfs-handling-on-os-probing-for-grub2.patch94
1 files changed, 94 insertions, 0 deletions
diff --git a/Improve-btrfs-handling-on-os-probing-for-grub2.patch b/Improve-btrfs-handling-on-os-probing-for-grub2.patch
new file mode 100644
index 00000000000..4e79674f966
--- /dev/null
+++ b/Improve-btrfs-handling-on-os-probing-for-grub2.patch
@@ -0,0 +1,94 @@
+From: Egbert Eich <eich@suse.de>
+Date: Fri May 29 08:55:21 2015 +0200
+Subject: Improve btrfs handling on os-probing for grub2
+Patch-mainline: never
+
+References: bsc#892364
+Signed-off-by: Egbert Eich <eich@suse.com>
+
+Currently probing of a grub2 config file is broken if
+the root/boot fs is btrfs. This is due to a patch picked
+from Fedora which attempts to determine the location of
+the kernel and probe for it.
+This code has meanwhile changed on Fedora, however the
+new version works no better than the old one.
+It is possible that this code works under very special
+circumstances of the Fedora system, however it is by no
+means valid.
+Our goal is to
+a. determine the location of the kernel in the mounted fs
+ regardless whether the grub2 config specifies an absolute
+ or relative path to the kernel file.
+b. Prepend the correct prefix if grub2_btrfs expects an
+ absolute path (either because the current grub2 fs isn't
+ btrfs or absolute path addressing is explicitely requested).
+c. Attempt to handle the location of the kernel file correctly
+ if this lives on a separate btrfs subvolume.
+ (Currently this only works if the path to this subvolume is
+ identical to the fs path).
+
+Signed-off-by: Egbert Eich <eich@suse.de>
+
+v2:
+a. Fix missing linux16/initrd16 parsing in entry result
+b. Fix kernelfile path if separate boot partition on btrfs
+
+Signed-off-by: Michael Chang <mchang@suse.com>
+---
+ linux-boot-probes/mounted/common/40grub2 | 16 +++++++++++++---
+ 1 file changed, 13 insertions(+), 3 deletions(-)
+
+Index: os-prober-1.61/linux-boot-probes/mounted/common/40grub2
+===================================================================
+--- os-prober-1.61.orig/linux-boot-probes/mounted/common/40grub2
++++ os-prober-1.61/linux-boot-probes/mounted/common/40grub2
+@@ -14,9 +14,19 @@ bootsv="$6"
+ found_item=0
+
+ entry_result () {
+- if [ "x$type" = "xbtrfs" -a "$rootsv" = "$bootsv" ]; then
+- # trim off the leading subvol
+- kernelfile=$(echo "$kernel" | cut -d '/' -f 2- | cut -d '/' -f 2-)
++ if [ "x$type" = "xbtrfs" ]; then
++ bsv=${bootsv:+/}${bootsv}
++ # if path is not relative to subvolume make it relative
++ kernel=${kernel#${bsv}}
++ kernelfile=$kernel
++ initrd=${initrd#${bsv}}
++ if [ "x$GRUB_FS" != "xbtrfs" -o "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" != "xtrue" ]; then
++ # absolute path needed: prepend subvolume if $kernel isn't empty
++ kernel=${kernel:+${bsv}}${kernel}
++ initrd=${initrd:+${bsv}}${initrd}
++ fi
++ # assumed: rootsv != bootsv if rootsv isn't ancestor of bootsv
++ [ "$partition" != "$bootpart" -o "$rootsv" != "$bootsv" ] && kernelfile="/boot${kernelfile}"
+ else
+ kernelfile=$kernel
+ fi
+@@ -81,7 +91,7 @@ parse_grub_menu () {
+ ignore_item=1
+ fi
+ ;;
+- linux|linuxefi)
++ linux|linuxefi|linux16)
+ # Hack alert: sed off any (hdn,n) but
+ # assume the kernel is on the same
+ # partition.
+@@ -90,14 +100,14 @@ parse_grub_menu () {
+ parameters="$@"
+ # Systems with a separate /boot will not have
+ # the path to the kernel in grub.cfg.
+- if [ "$partition" != "$bootpart" ]; then
++ if [ "$partition" != "$bootpart" -a "$type" != "btrfs" ]; then
+ kernel="/boot$kernel"
+ fi
+ ;;
+- initrd|initrdefi)
++ initrd|initrdefi|initrd16)
+ initrd="$(echo "$2" | sed 's/(.*)//')"
+ # Initrd same.
+- if [ "$partition" != "$bootpart" ]; then
++ if [ "$partition" != "$bootpart" -a "$type" != "btrfs" ]; then
+ initrd="/boot$initrd"
+ fi
+ ;;