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| Current File : //bin/linux-boot-prober |
#!/bin/sh
# dash shell does not have "{varname}>&1" feature that bash shell has
# for auto-assignment of new filedescriptors.
# It is cumbersome to write the 'eval' to use our own variables in redirections.
# Therefore use fixed numbers.
export fd_result=3 # file descriptor for external results
export fd_logger=9 # file descriptor for input to logger
. /usr/share/os-prober/common.sh
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
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="$1"
type=other
fi
if [ "x$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/libexec/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 '$partition' does not exist; skipping"
continue
fi
( (
if ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map"; then
for test in /usr/libexec/linux-boot-probes/*; do
if [ -x $test ] && [ -f $test ]; then
debug "running $test"
if $test "$partition"; then
debug "linux detected by $test"
break
fi
fi
done
else
mpoint=$(grep "^$mapped " "$OS_PROBER_TMP/mounted-map" | head -n1 | cut -d " " -f 2)
mpoint="$(unescape_mount "$mpoint")"
if [ "$mpoint" != "/target/boot" ] && [ "$mpoint" != "/target" ] && [ "$mpoint" != "/" ]; then
type=$(grep "^$mapped " "$OS_PROBER_TMP/mounted-map" | head -n1 | cut -d " " -f 3)
if ! grep -q " $mpoint/boot " "$OS_PROBER_TMP/mounted-map"; then
linux_mount_boot "$partition" "$mpoint"
bootpart="${mountboot%% *}"
bootmounted="${mountboot#* }"
else
bootpart="$(grep " $mpoint/boot " "$OS_PROBER_TMP/mounted-map" | head -n1 | cut -d " " -f 4)"
bootmounted=0
fi
for test in /usr/libexec/linux-boot-probes/mounted/*; do
if [ -f $test ] && [ -x $test ]; then
debug "running $test on mounted $partition"
if $test "$partition" "$bootpart" "$mpoint" "$type"; then
debug "$test succeeded"
break
fi
fi
done
if [ "$bootmounted" = 1 ]; then
if ! umount "$mpoint/boot"; then
warn "failed to umount $mpoint/boot"
fi
fi
fi
fi
) 9>&1 | logger 1>&- # fd_logger
) 3>&1 # fd_result