From 916d8338b56b514b8f0ef72530a627fa28463140 Mon Sep 17 00:00:00 2001
From: Gene Czarcinski <gczarcinski@gmail.com>
Date: Thu, 31 Jan 2013 23:58:53 +0330
Subject: [PATCH 08/18] Improve btrfs detection support (#888341)
Enables os-prober to detect multiple installations that live in separate
btrfs storage pools.
Resolves: rhbz#888341
---
README.btrfs | 15 ++++
common.sh | 13 ++-
linux-boot-prober | 133 ++++++++++++++++++++++++++++++-
linux-boot-probes/mounted/common/40grub2 | 12 ++-
os-prober | 28 ++++++-
os-probes/common/50mounted-tests | 98 +++++++++++++++++++++--
os-probes/mounted/common/90linux-distro | 8 +-
7 files changed, 293 insertions(+), 14 deletions(-)
create mode 100644 README.btrfs
diff --git a/README.btrfs b/README.btrfs
new file mode 100644
index 0000000..f9b4d45
--- /dev/null
+++ b/README.btrfs
@@ -0,0 +1,15 @@
+BTRFS is a new filesystem which combines the filesystem with logical volume
+management (subvolumes). For further information, see:
+ https://btrfs.wiki.kernel.org/index.php/Main_Page
+ https://btrfs.wiki.kernel.org/index.php/FAQ
+
+In order to support BTRFS, a number of changes were necessary to os-prober,
+os-probes/common/50mounted-tests, os-probes/mounted/common/90linux-distro,
+linux-boot-prober, and linux-boot-probes/common/50mounted-tests.
+
+The biggest impact will be to grub2 where there is additional information
+output by os-prober and where, if a BTRFS subvolume is being used for root,
+the parameters for linux-boot-prober have changed.
+
+Sun 30 Dec 2012 11:49:52 AM EST Gene Czarcinski <gene@czarc.net>
+
diff --git a/common.sh b/common.sh
index 19ef90a..85d13f0 100644
--- a/common.sh
+++ b/common.sh
@@ -127,6 +127,7 @@ parse_proc_mounts () {
done
}
+# add forth parameter to pickup btrfs subvol info
parsefstab () {
while read -r line; do
case "$line" in
@@ -137,12 +138,22 @@ parsefstab () {
set -f
set -- $line
set +f
- printf '%s %s %s\n' "$1" "$2" "$3"
+ printf '%s %s %s %s\n' "$1" "$2" "$3" "$4"
;;
esac
done
}
+#check_btrfs_mounted $bootsv $bootuuid)
+check_btrfs_mounted () {
+ bootsv="$1"
+ bootuuid="$2"
+ bootdev=$(blkid | grep "$bootuuid" | cut -d ':' -f 1)
+ bindfrom=$(grep " btrfs " /proc/self/mountinfo |
+ grep " $bootdev " | grep " /$bootsv " | cut -d ' ' -f 5)
+ printf "%s" "$bindfrom"
+}
+
unescape_mount () {
printf %s "$1" | \
sed 's/\\011/ /g; s/\\012/\n/g; s/\\040/ /g; s/\\134/\\/g'
diff --git a/linux-boot-prober b/linux-boot-prober
index e32dc84..505c2fd 100755
--- a/linux-boot-prober
+++ b/linux-boot-prober
@@ -5,16 +5,143 @@ set -e
newns "$@"
require_tmpdir
+ERR="n"
+
+tmpmnt=/var/lib/os-prober/mount
+if [ ! -d "$tmpmnt" ]; then
+ mkdir "$tmpmnt"
+fi
+
+mounted=
+bootmnt=
+bootsv=
+bootuuid=
grep "^/dev/" /proc/mounts | parse_proc_mounts >"$OS_PROBER_TMP/mounted-map" || true
-partition="$1"
+if [ -z "$1" ]; then
+ ERR=y
+elif [ "$1" = btrfs -a -z "$2" ]; then
+ ERR=y
+elif [ "$1" = btrfs -a -z "$3" ]; then
+ ERR=y
+elif [ "$1" = btrfs ]; then
+ type=btrfs
+ echo "$2" | grep -q "^UUID=" || ERR=y
+ echo "$3" | grep -q "^subvol=" || ERR=y
+ export "$2"
+ export "$3"
+ partition=$(blkid | grep "$UUID" | cut -d ':' -f 1 | tr '\n' ' ' | cut -d ' ' -f 1)
+ debug "btrfs: partition=$partition, UUID=$UUID, subvol=$subvol"
+else
+ partition="$1"
+ type=other
+fi
-if [ -z "$partition" ]; then
+if [ "x$ERR" != xn ]; then
echo "usage: linux-boot-prober partition" >&2
+ echo " linux-boot-prober btrfs UUID=<> subvol=<>" >&2
exit 1
fi
+if [ "$type" = btrfs ]; then
+ # handle all of the btrfs stuff here
+ if [ ! -e "/proc/self/mountinfo" ]; then
+ warn "/proc/self/mountinfo does not exist, exiting"
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ mpoint=$(grep "btrfs" /proc/self/mountinfo | grep " /$subvol " | grep " $partition " | cut -d ' ' -f 5)
+ if [ "$mpoint" = "/" ]; then
+ warn "specifying active root not valid, exiting"
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ if [ "$mpoint" = "$tmpmnt" ]; then
+ warn "btrfs subvol=$subvool, UUID=$UUID, already mounted on $tmpmnt **ERROR**"
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ if [ -z "$mpoint" ]; then
+ # mount the btrfs root
+ if ! mount -o subvol=$subvol -t btrfs -U $UUID "$tmpmnt" 2>/dev/null; then
+ warn "error mounting btrfs subvol=$subvol UUID=$UUID"
+ umount "$tmpmnt/boot" 2>/dev/null
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ else
+ # bind-mount
+ if ! mount -o bind "$mpoint" "$tmpmnt" 2>/dev/null; then
+ warn "error mounting btrfs bindfrom=$mpoint subvol=$subvol UUID=$UUID"
+ umount "$tmpmnt/boot" 2>/dev/null
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ fi
+ debug "mounted btrfs $partition, subvol=$subvol on $tmpmnt"
+ if [ ! -e "$tmpmnt/etc/fstab" ]; then
+ warn "btrfs subvol=$subvol not root"
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ bootmnt=$(parsefstab < "$tmpmnt/etc/fstab" | grep " /boot ") || true
+ if [ -z "$bootmnt" ]; then
+ # /boot is part of the root
+ bootpart="$partition"
+ bootsv="$subvol"
+ elif echo "$bootmnt" | cut -d ' ' -f 3 | grep -q "btrfs"; then
+ # separate btrfs /boot subvolume
+ bootsv=$(echo "$bootmnt" | cut -d ' ' -f 4 | grep "^subvol=" | sed "s/subvol=//" )
+ bootuuid=$(echo "$bootmnt" | cut -d ' ' -f 1 | grep "^UUID=" | sed "s/UUID=//" )
+ debug "mounting btrfs $tmpmnt/boot UUID=$bootuuid subvol=$bootsv"
+ bindfrom=$(check_btrfs_mounted $bootsv $bootuuid)
+ if [ -n "$bindfrom" ]; then
+ # already mounted some place
+ if ! mount -o bind $bindfrom "$tmpmnt/boot" 2>/dev/null; then
+ warn "error bind mounting btrfs boot subvol=$bootsv, from=$bindfrom"
+ umount "$tmpmnt/boot" 2>/dev/null
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ elif ! mount -o subvol=$bootsv -t btrfs -U $bootuuid "$tmpmnt/boot" 2>/dev/null; then
+ warn "error mounting btrfs boot partition subvol=$bootsv, UUID=$bootuuid"
+ umount "$tmpmnt/boot" 2>/dev/null
+ umount "$tmpmnt" 2>/dev/null
+ rmdir "$tmpmnt" 2>/dev/null
+ exit 1
+ fi
+ bootpart=$(grep " btrfs " /proc/self/mountinfo | grep " /$bootsv " | cut -d ' ' -f 10)
+ else
+ # non-btrfs partition or logical volume
+ linux_mount_boot $partition $tmpmnt
+ bootpart="${mountboot%% *}"
+ bootsv=
+ fi
+
+ test="/usr/lib/linux-boot-probes/mounted/40grub2"
+ if [ -f $test ] && [ -x $test ]; then
+ debug "running $test $partition $bootpart $tmpmnt $type $subvol $bootsv"
+ if $test "$partition" "$bootpart" "$tmpmnt" "$type" "$subvol" "$bootsv"; then
+ debug "$test succeeded"
+ fi
+ fi
+ umount "$tmpmnt/boot" 2>/dev/null || true
+ if ! umount "$tmpmnt" 2>/dev/null; then
+ warn "problem umount $tmpmnt"
+ fi
+ rmdir "$tmpmnt" 2>/dev/null || true
+
+ exit 0
+fi
+
if ! mapped="$(mapdevfs "$partition")"; then
log "Device '$partition' does not exist; skipping"
continue
@@ -22,8 +149,8 @@ fi
if ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map"; then
for test in /usr/lib/linux-boot-probes/*; do
- debug "running $test"
if [ -x $test ] && [ -f $test ]; then
+ debug "running $test"
if $test "$partition"; then
debug "linux detected by $test"
break
diff --git a/linux-boot-probes/mounted/common/40grub2 b/linux-boot-probes/mounted/common/40grub2
index 885614e..11ffa1b 100755
--- a/linux-boot-probes/mounted/common/40grub2
+++ b/linux-boot-probes/mounted/common/40grub2
@@ -2,17 +2,27 @@
. /usr/share/os-prober/common.sh
set -e
+# add support for btrfs with no separate /boot
+# that is, rootsv = bootsv
partition="$1"
bootpart="$2"
mpoint="$3"
type="$4"
+rootsv="$5"
+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-)
+ else
+ kernelfile=$kernel
+ fi
if [ "$ignore_item" = 0 ] && \
[ -n "$kernel" ] && \
- [ -e "$mpoint/$kernel" ]; then
+ [ -e "$mpoint/$kernelfile" ]; then
result "$rootpart:$bootpart:$title:$kernel:$initrd:$parameters"
found_item=1
fi
diff --git a/os-prober b/os-prober
index 99ede8e..ca8f5ab 100755
--- a/os-prober
+++ b/os-prober
@@ -64,9 +64,12 @@ partitions () {
# Also detect OSes on LVM volumes (assumes LVM is active)
if type lvs >/dev/null 2>&1; then
- echo "$(LVM_SUPPRESS_FD_WARNINGS=1 log_output lvs --noheadings --separator : -o vg_name,lv_name |
+ echo "$(LVM_SUPPRESS_FD_WARNINGS=1 log_output lvs --noheadings --separator : -o vg_name,lv_name 2>/dev/null |
sed "s|-|--|g;s|^[[:space:]]*\(.*\):\(.*\)$|/dev/mapper/\1-\2|")"
fi
+
+ # now lets make sure we got all of the btrfs partitions and disks
+ blkid | grep btrfs | cut -d ':' -f 1
}
parse_proc_swaps () {
@@ -124,6 +127,8 @@ if [ -f /proc/mdstat ] ; then
grep "^md" /proc/mdstat | cut -d: -f2- | parse_proc_mdstat >"$OS_PROBER_TMP/raided-map" || true
fi
+: >"$OS_PROBER_TMP/btrfs-vols"
+
for partition in $(partitions); do
if ! mapped="$(mapdevfs "$partition")"; then
log "Device '$partition' does not exist; skipping"
@@ -142,7 +147,26 @@ for partition in $(partitions); do
continue
fi
- if ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map" ; then
+ # do btrfs processing here; both mounted and unmounted will
+ # be handled by 50mounted-tests so we can do a subvol only once.
+ type=$(blkid -o value -s TYPE $mapped)
+ if [ "$type" = btrfs ]; then
+ uuid=$(blkid -o value -s UUID $mapped)
+ if grep -q "^$uuid" "$OS_PROBER_TMP/btrfs-vols" ; then
+ continue
+ fi
+ debug "btrfs volume uuid=$uuid partition=$partition"
+ echo "$uuid" >>"$OS_PROBER_TMP/btrfs-vols"
+ test="/usr/lib/os-probes/50mounted-tests"
+ if [ -f "$test" ] && [ -x "$test" ]; then
+ debug "running $test on btrfs $partition"
+ if "$test" btrfs "$uuid" "$partition"; then
+ debug "os detected by $test"
+ continue
+ fi
+ fi
+
+ elif ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map" ; then
for test in /usr/lib/os-probes/*; do
if [ -f "$test" ] && [ -x "$test" ]; then
debug "running $test on $partition"
diff --git a/os-probes/common/50mounted-tests b/os-probes/common/50mounted-tests
index 561163b..751999a 100755
--- a/os-probes/common/50mounted-tests
+++ b/os-probes/common/50mounted-tests
@@ -1,20 +1,36 @@
#!/bin/sh
# Sub-tests that require a mounted partition.
set -e
-partition="$1"
. /usr/share/os-prober/common.sh
-types="$(fs_type "$partition")" || types=NOT-DETECTED
+if [ "x$1" = xbtrfs ]; then
+ types=btrfs
+ if [ -z "$2" -o -z "$3" ]; then
+ debug "missing btrfs parameters, exiting"
+ exit 1
+ fi
+ UUID="$2"
+ BTRFSDEV="$3"
+else
+ partition="$1"
+ types="$(fs_type "$partition")" || types=NOT-DETECTED
+fi
+
if [ "$types" = NOT-DETECTED ]; then
debug "$1 type not recognised; skipping"
- exit 0
+ exit 1
+elif [ "x$types" = "x" ]; then
+ exit 1
+elif [ "$types" = LVM2_member ]; then
+ debug "skipping LVM2 Volume Group on $partition"
+ exit 1
elif [ "$types" = swap ]; then
debug "$1 is a swap partition; skipping"
- exit 0
+ exit 1
elif [ "$types" = crypto_LUKS ]; then
debug "$1 is a LUKS partition; skipping"
- exit 0
+ exit 1
elif [ "$types" = ntfs ]; then
if type ntfs-3g >/dev/null 2>&1; then
types='ntfs-3g ntfs'
@@ -23,7 +39,7 @@ elif [ -z "$types" ]; then
if type cryptsetup >/dev/null 2>&1 && \
cryptsetup luksDump "$partition" >/dev/null 2>&1; then
debug "$1 is a LUKS partition; skipping"
- exit 0
+ exit 1
fi
for type in $(grep -v nodev /proc/filesystems); do
# hfsplus filesystems are mountable as hfs. Try hfs last so
@@ -46,6 +62,76 @@ if [ ! -d "$tmpmnt" ]; then
fi
mounted=
+
+# all btrfs processing here. Handle both unmounted and
+# mounted subvolumes.
+if [ "$types" = btrfs ]; then
+ partition="$BTRFSDEV"
+ debug "begin btrfs processing for $UUID"
+ # note that the btrfs volume must not be mounted ro
+ if mount -t btrfs -U "$UUID" "$tmpmnt" 2>/dev/null; then
+ debug "btrfs volume $UUID mounted"
+ else
+ warn "cannot mount btrfs volume $UUID, exiting"
+ rmdir "$tmpmnt" || true
+ exit 1
+ fi
+ # besides regular subvols, get ro and snapshot so thet can be excluded
+ subvols=$(btrfs subvolume list "$tmpmnt" | cut -d ' ' -f 9)
+ rosubvols=$(btrfs subvolume list -r "$tmpmnt" | cut -d ' ' -f 9)
+ sssubvols=$(btrfs subvolume list -s "$tmpmnt" | cut -d ' ' -f 9)
+ if ! umount "$tmpmnt"; then
+ warn "failed to umount btrfs volume on $tmpmnt"
+ rmdir "$tmpmnt" || true
+ exit 1
+ fi
+ if [ -z "$subvols" ]; then
+ debug "no subvols found on btrfs volume $UUID"
+ exit 1
+ fi
+ found=
+ for subvol in $subvols; do
+ debug "begin btrfs processing for $UUID subvol=$subvol"
+ if echo "$rosubvols" | grep -q -x "$subvol"; then
+ continue
+ fi
+ if echo "$sssubvols" | grep -q -x "$subvol"; then
+ continue
+ fi
+ mounted=
+ mpoint="$(grep btrfs /proc/self/mountinfo | grep "$partition " | grep "/$subvol " | cut -d ' ' -f 5)"
+ if [ -n "$mpoint" ]; then
+ if [ "x$mpoint" = "x/" ]; then
+ continue # this is the root for the running system
+ fi
+ mounted=1
+ else
+ # again, do not mount btrfs ro
+ mount -t btrfs -o subvol="$subvol" -U "$UUID" "$tmpmnt"
+ mpoint="$tmpmnt"
+ fi
+ test="/usr/lib/os-probes/mounted/90linux-distro"
+ if [ -f "$test" ] && [ -x "$test" ]; then
+ debug "running subtest $test"
+ if "$test" "$partition" "$mpoint" btrfs "UUID=$UUID" "subvol=$subvol"; then
+ debug "os found by subtest $test on subvol $subvol"
+ found=1
+ fi
+ fi
+ if [ -z "$mounted" ]; then
+ if ! umount "$tmpmnt"; then
+ warn "failed to umount $tmpmnt"
+ fi
+ fi
+ done
+ rmdir "$tmpmnt" || true
+ if [ "$found" ]; then
+ exit 0
+ else
+ exit 1
+ fi
+fi
+
if type grub-mount >/dev/null 2>&1 && \
type grub-probe >/dev/null 2>&1 && \
grub-mount "$partition" "$tmpmnt" 2>/dev/null; then
diff --git a/os-probes/mounted/common/90linux-distro b/os-probes/mounted/common/90linux-distro
index 583a9ec..6b03c7a 100755
--- a/os-probes/mounted/common/90linux-distro
+++ b/os-probes/mounted/common/90linux-distro
@@ -7,6 +7,8 @@ set -e
partition="$1"
dir="$2"
type="$3"
+uuid="$4"
+subvol="$5"
# This test is inaccurate, but given separate / and /boot partitions and the
# fact that only some architectures have ld-linux.so, I can't see anything
@@ -131,7 +133,11 @@ if (ls "$dir"/lib*/ld*.so* && [ -d "$dir/boot" ] || ls "$dir"/usr/lib*/ld*.so*)
fi
label="$(count_next_label "$short")"
- result "$partition:$long:$label:linux"
+ if [ "x$type" = "xbtrfs" -a "x$uuid" != "x" -a "x$subvol" != "x" ]; then
+ result "$partition:$long:$label:linux:$type:$uuid:$subvol"
+ else
+ result "$partition:$long:$label:linux"
+ fi
exit 0
else
exit 1
--
2.5.5