# See the License for the specific language governing permissions and
# limitations under the License.
-
+# usage: mount-latest-subvol
[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
set -o pipefail
}
bash-trace() {
- local -i argc_index=0 arg frame i start=${1:-1} max_indent=8 indent
+ local -i argc_index=0 frame i start=${1:-1} max_indent=8 indent
local source
local extdebug=false
if [[ $(shopt -p extdebug) == *-s* ]]; then
e mount $dir
fi
}
+fstab() {
+ while read -r start mpoint end; do
+ l="$start $mpoint $end"
+ # kill off any lines that duplicate the mount point.
+ sed --follow-symlinks -ri "\%$l%b;\%^\s*\S+\s+$mpoint\s%d" /etc/fstab
+ tu /etc/fstab <<<"$l"
+ done
+}
+kill-dir() {
+ for sig; do
+ echo kill-dir $sig
+ found_pids=false
+ if pids=$(timeout 4 lsof -t $dir); then
+ found_pids=true
+ timeout 4 lsof -w $dir
+ kill -$sig $pids
+ fi
+ # fuser will find open sockets that lsof won't, for example from gpg-agent.
+ # note: -v shows kernel processes, which then doesn't return true when we want
+ if timeout 4 fuser -m $dir &>/dev/null; then
+ found_pids=true
+ fuser -$sig -mvk $dir
+ fi
+ sleep .5
+ if ! $found_pids; then
+ return 0
+ fi
+ done
+ return 1
+}
+
+force=false
+if [[ $1 == -f ]]; then
+ force=true
+fi
ret=0
+##### begin setup fstab for subvols we care about ######
first_root_crypt=$(awk '$2 == "/" {print $1}' /etc/mtab)
-tu /etc/fstab <<EOF
+fstab <<EOF
$first_root_crypt /a btrfs noatime,subvol=a 0 0
EOF
-case $HOSTNAME in
- treetowl|x2|frodo)
- tu /etc/fstab <<EOF
-$first_root_crypt /q btrfs noatime,subvol=q 0 0
+
+shopt -s nullglob
+
+# ssh and probably some other things care about parent directory
+# ownership, and ssh doesn\'t allow any group writable parent
+# directories, so we are forced to use a directory structure similar
+# to home directories
+f=(/mnt/root/btrbk/q.*)
+if [[ -e $f ]]; then
+ fstab <<EOF
+$first_root_crypt /q btrfs noatime,subvol=q,gid=1000 0 0
/q/p /p none bind 0 0
EOF
- ;;
-esac
+fi
+
+f=(/mnt/root/btrbk/o.*)
+if [[ -e $f ]]; then
+ fstab <<EOF
+$first_root_crypt /o btrfs noatime,subvol=o 0 0
+/o/m /m none bind 0 0
+EOF
+fi
+
+if [[ $HOSTNAME == frodo ]]; then
+ fstab <<EOF
+$first_root_crypt /i btrfs noatime,subvol=i 0 0
+EOF
+fi
+##### end setup fstab for subvols we care about ######
-for vol in q a; do
+for vol in q a o i; do
d=/$vol
if ! awk '{print $2}' /etc/fstab | grep -xF $d &>/dev/null; then
continue
fi
- binds=()
- roots=($d)
+ ##### begin building up list of bind mounts ######
+ binds=() # list of bind mounts
+ roots=($d) # list of bind mounts, plus the original mount
while true; do
new_roots=()
for r in ${roots[@]}; do
- # example
+ # eg. when r=/q/p, for lines like
# /q/p /p none bind 0 0
+ # output /p
new_roots+=($(sed -rn "s#^$r/\S+\s+(\S+)\s+none\s+bind\s.*#\1#p" /etc/fstab))
done
(( ${#new_roots} )) || break
binds+=(${new_roots[@]})
roots=( ${new_roots[@]} )
done
+ ##### end building up list of bind mounts ######
+
# if latest is already mounted, make sure binds are mounted and move on
if e check-subvol-stale $d; then
+ mnt $d
for b in ${binds[@]}; do
mnt $b
done
continue
fi
- last_snap=$(</nocow/btrfs-stale/$vol)
- if [[ ! $last_snap ]]; then
- echo "$0: error. empty last_snap var"
+ fresh_snap=$(</nocow/btrfs-stale/$vol)
+ if [[ ! $fresh_snap ]]; then
+ echo "$0: error. empty fresh_snap var"
ret=1
continue
fi
if e umount -R $dir; then
unmounted+=($dir)
else
- umount_ret=false
- ret=1
- echo "$0: failed to umount $dir"
- break
+ if ! kill-dir TERM TERM TERM INT INT HUP HUP; then
+ if $force; then kill-dir KILL; fi
+ fi
+
+ if e umount -R $dir; then
+ unmounted+=($dir)
+ else
+ echo "$0: failed to umount $dir"
+ umount_ret=false
+ ret=1
+ continue
+ fi
fi
fi
done
continue
fi
+ # todo: decipher /mnt/root, like we do in check-subvol-stale
cd /mnt/root
if [[ -e $vol ]]; then
- e btrfs sub del $vol
+ e mv $vol $vol.leaf.$(date +%Y%m%dT%H%M%S%z)
fi
# Note, we make a few assumptions in this script, like
# $d was not a different subvol id than $vol, and
# things otherwise didn't get mounted very strangely.
- e btrfs sub snapshot btrbk/$last_snap $vol
+ e btrfs sub snapshot $fresh_snap $vol
for dir in $d ${binds[@]}; do
e mnt $dir
done
rm -f $stale_dir/$d
done
-if [[ $HOSTNAME == treetowl ]]; then
+### disabled
+if [[ $HOSTNAME == treetowlxxxxxxxxx ]]; then
# partitioned it with fai partitioner outside of fai,
# because it\'s worth it to have 1% space reserved for boot and
# swap partitions in case I ever want to boot off those drives.