3 # On Ian's computers, mount received subvolumes after btrbk.
4 # Copyright (C) 2024 Ian Kelling
6 # This program is free software: you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation, either version 3 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19 # SPDX-License-Identifier: GPL-3.0-or-later
21 this_file
="$(readlink -f -- "${BASH_SOURCE[0]}")"
24 [[ $EUID == 0 ]] ||
exec sudo
-E "$this_file" "$@"
26 set -e; .
/usr
/local
/lib
/bash-bear
; set +e
30 Usage: ${0##*/} [OPTIONS] [SUBVOLUMES]
32 -h|--help Print help and exit.
33 -f|--force Use kill -9 to try fixing unmount errors
34 -v|--verbose Be more verbose
37 Note: In git this is not not executable because it's meant to be installed
38 using ./install-my-scripts
40 Note: Uses util-linux getopt option parsing: spaces between args and
41 options, short options can be combined, options before args.
46 pre
="mount-latest-subvol:${SSH_CLIENT:+ $HOSTNAME:}"
49 while read -r line
; do
51 grep -xFq "$line" "$file" ||
tee -a "$file"<<<"$line"
56 printf "$pre %s\n" "$*"
61 printf "$pre %s\n" "$*"
66 printf "$pre %s\n" "$*"
72 if ! mountpoint
-q $dir; then
78 while read -r start mpoint end
; do
79 l
="$start $mpoint $end"
80 # kill off any lines that duplicate the mount point.
81 sed --follow-symlinks -ri "\%$l%b;\%^\s*\S+\s+$mpoint\s%d" /etc
/fstab
87 for m
in ${my_pids[@]}; do
89 echo "$0: error: pids to kill includes our pid or a parent. ps output:" >&2
100 if pids
=$
(timeout
4 lsof
-t $dir); then
102 timeout
4 lsof
-w $dir
106 # fuser will find open sockets that lsof won't, for example from gpg-agent.
107 # note: -v shows kernel processes, which then doesn't return true when we want
108 if pids
=$
(timeout
4 fuser
-m $dir 2>/dev
/null
); then
111 fuser
-$sig -mvk $dir
114 if ! $found_pids; then
122 if mountpoint
-q $dir; then
123 if m umount
-R $dir; then
126 if ! kill-dir TERM TERM TERM INT INT HUP HUP TERM TERM TERM INT INT HUP HUP
; then
127 if $force; then kill-dir KILL
; fi
130 if m umount
-R $dir; then
133 echo "$0: failed to umount $dir"
141 # duplicated in check-subvol
142 # Reassign $1 var from /dev/dm- to corresponding /dev/mapper/
146 if [[ $devref == /dev
/dm-
* ]]; then
147 for mapdev
in /dev
/mapper
/*; do
148 if [[ $
(readlink
-f $mapdev) == "$devref" ]]; then
157 ##### begin command line parsing ########
159 # you can remove this if you do not have options which can have args with spaces or empty.
163 temp
=$
(getopt
-l help,force
,verbose hfv
"$@") || usage
1
167 -f|
--force) force
=true
;;
168 -v|
--verbose) verbose
=true
;;
171 *) echo "$0: unexpected args: $*" >&2 ; usage
1 ;;
179 all_vols
=(q a o i
ar qd qr
)
182 ##### end command line parsing ########
186 ##### begin setup fstab for subvols we care about ######
188 if [[ -e /mnt
/root
/root2-crypttab
]]; then
189 tu
/etc
/crypttab
</mnt
/root
/root2-crypttab
190 while read -r mapper_dev _
; do
191 if [[ ! -e /dev
/mapper
/$mapper_dev ]]; then
192 m cryptdisks_start
$mapper_dev
194 done < <(cat /mnt
/root
/root2-crypttab
)
196 if [[ -e /mnt
/root
/root2-fstab
]]; then
197 tu
/etc
/fstab
</mnt
/root
/root2-fstab
202 root_dev
=$
(awk '$2 == "/" {print $1}' /etc
/mtab
)
204 o_dev
=$
(awk '$2 == "/mnt/o" {print $1}' /etc
/mtab
)
208 # root2_dev=$(awk '$2 == "/mnt/root2" {print $1}' /etc/mtab)
209 # mapper-dev root2_dev
210 # # dont bother with the above for crypt2_dev
211 # crypt2_dev=$root2_dev
214 if cryptsetup status
$root_dev &>/dev
/null
; then
216 else # if we are in a recovery boot, find the next best crypt device
218 # todo: I think I had an idea to not setup /o in this case,
219 # but never finished implementing it
220 for dev
in $
(dmsetup
ls --target crypt |
awk '{print $1}'); do
222 if awk '{print $1}' /etc
/mtab |
grep -Fx $dev &>/dev
/null
; then
231 # dont tax the cpus of old laptops
232 if (( $
(nproc
) > 2)); then
233 mopts
+=,compress=zstd
237 $crypt_dev /a btrfs noatime,subvol=a$mopts 0 0
242 # ssh and probably some other things care about parent directory
243 # ownership, and ssh doesn\'t allow any group writable parent
244 # directories, so we are forced to use a directory structure similar
245 # to home directories
246 fa
=(/mnt
/root
/btrbk
/q.
*); f
=${fa[0]}
249 $crypt_dev /q btrfs noatime,subvol=q$mopts 0 0
250 $crypt_dev /qd btrfs noatime,subvol=qd$mopts 0 0
251 /q/p /p none bind$mopts 0 0
255 fa
=(/mnt
/root
/btrbk
/qr.
*); f
=${fa[0]}
258 $crypt_dev /qr btrfs noatime,subvol=qr$mopts 0 0
262 # not syncing ar at the moment
263 # fa=(/mnt/root/btrbk/ar.*); f=${fa[0]}
264 # if [[ -e $f ]]; then
266 # $crypt_dev /ar btrfs noatime,subvol=ar,uid=1000$mopts 0 0
271 fa
=(/mnt
/o
/btrbk
/o.
*); f
=${fa[0]}
273 if [[ $o_dev != "$root_dev" ]]; then
274 # ,compress=zstd regardless of mopts since these are all text files
275 # and it cuts disk use by about half.
277 $o_dev /o btrfs noatime,subvol=o${mopts/,compress=zstd/},compress=zstd 0 0
281 /o/m /m none bind$mopts 0 0
282 /o/debbugs /debbugs none bind$mopts 0 0
287 ##### end setup fstab for subvols we care about ######
289 ### begin get pids that this program depends on so we dont kill them
293 while [[ ${my_pids[-1]} != 1 && ${my_pids[-1]} != "${my_pids[-2]}" && $count -lt $loop_limit ]]; do
295 p=$(ps -p ${my_pids[-1]} -o ppid=)
296 if [[ $p == 0 || ! $p ]]; then
301 ### end get pids that this program depends on so we dont kill them
303 for vol in ${all_vols[@]}; do
305 if ! awk '$3 == "btrfs
" {print $2}' /etc/fstab | grep -xF $d &>/dev/null; then
310 ##### begin building up list of bind mounts ######
311 binds=() # list of bind mounts
315 for r in ${roots[@]}; do
316 # eg. when r=/q/p, for lines like
317 # /q/p /p none bind 0 0
319 new_roots+=("$
(sed -rn "s#^$r/\S+\s+(\S+)\s+none\s+(\S+,|)bind[[:space:],].*#\1#p" /etc
/fstab
)")
321 (( ${#new_roots} )) || break
322 binds+=(${new_roots[@]})
323 # roots is used to recursively find binds of binds if they exist.
324 roots=( ${new_roots[@]} )
326 ##### end building up list of bind mounts ######
330 # if latest is already mounted, make sure binds are mounted and move on
331 m check-subvol-stale $d
332 # populated by check-subvol-stale if stale
333 if ! fresh_snap=$(cat /nocow/btrfs-stale/$vol 2>/dev/null); then
336 for b in ${binds[@]}; do
337 if mountpoint -q $b; then
339 if [[ $did != "$bid" ]]; then
349 ##### begin checking for loopback mounts ####
351 for l in $(losetup -ln|awk '{print $6}'); do
352 for dir in $d ${binds[@]}; do
353 if [[ $l == $dir* ]]; then
354 echo "$0: found loopback mount
$l. giving up on unmounting
$dir"
367 ##### end end checking loopback mounts ####
370 ## not using arbtt at the moment
371 # if [[ $vol == q ]]; then
372 # ## allow to fail, user might not be logged in
373 # x sudo -u $(id -nu 1000) XDG_RUNTIME_DIR=/run/user/1000 systemctl --user stop arbtt ||:
377 for dir in $(echo $d ${binds[*]}\ |tac -s\ ); do
381 # if we unmounted some but not all, restore them and move on
382 if ! $umount_ret; then
383 for dir in ${unmounted[@]}; do
389 #### begin dealing with leaf vols ####
391 ### begin getting root_dir
392 ### this is duplicated in check-subvol-stale
394 dev=$(sed -rn "s
,^\s
*([^
#]\S*)\s+$d\s.*,\1,p" /etc/fstab /etc/mtab|head -n1)
396 # note, we need $dev because $d might not be mounted, and we do this loop
397 # because the device in fstab for the rootfs can be different.
398 for devx
in $
(btrfs fil show
$dev|
sed -rn 's#.*path (\S+)$#\1#p'); do
399 if [[ $devx == dm-
* ]]; then
404 root_dir
=$
(sed -rn "s,^\s*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc
/mtab
/etc
/fstab|
head -n1)
405 if [[ $root_dir ]]; then
410 if [[ ! $root_dir ]]; then
411 echo "$0: error could not find root subvol mount for $dev" >&2
414 ### end getting root_dir
417 if [[ -e $vol ]]; then
418 if [[ $vol == qd
]]; then
421 leaf
=$vol.leaf.$
(date +%Y-
%m-
%dT
%H
:%M
:%S
%z
)
423 m btrfs property
set -ts $leaf ro true
425 ### begin check if leaf is different, delete it if not ###
426 parentid
=$
(btrfs sub show
$leaf |
awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
428 bsub
= # base subvolume
429 # go in reverse order as its more likely to be at the end
430 for ((i
=${#bsubs[@]}-1; i
>=0; i--
)); do
431 if [[ $parentid == $
(btrfs sub show
${bsubs[i]} |
awk '$1 == "UUID:" {print $2}') ]]; then
437 # in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
439 # EPIPE 32 Broken pipe
440 lines
=$
(btrfs send
--no-data -p $bsub $leaf | btrfs receive
--dump |
head -n 100 |
wc -l ||
[[ $?
== 141 ||
${PIPESTATUS[0]} == 32 ]])
441 if [[ $lines == 0 ]]; then
442 # example output of no differences:
443 # snapshot ./qrtest uuid=c41ff6b7-0527-f34d-95ac-190eecf54ff5 transid=2239 parent_uuid=64949e1b-4a3e-3945-9a8e-cd7b7c15d7d6 parent_transid=2239
444 echo suspected identical
: $bsub $leaf
445 x btrfs sub del
$leaf
448 ### end check if leaf is different, delete it if not ###
450 ## begin expire leaf vols ##
451 leaf_vols
=($vol.leaf.
*)
452 count
=${#leaf_vols[@]}
453 leaf_limit_time
=$
(( EPOCHSECONDS
- 60*60*24*60 )) # 60 days
454 leaf_new_limit_time
=$
(( EPOCHSECONDS
- 60*60*24 * 5 )) # 5 days this
455 # goes backwards from oldest. leaf_new_limit_time is a safety
456 # measure to ensure we don't delete very recent leafs.
457 for leaf
in ${leaf_vols[@]}; do
458 leaf_time
=$
(date -d ${leaf#"$vol".leaf.} +%s
)
459 if (( leaf_limit_time
> leaf_time ||
( leaf_new_limit_time
> leaf_time
&& count
> 30 ) )); then
460 x btrfs sub del
$leaf
465 ## end expire leaf vols ##
467 #### end dealing with leaf vols ####
469 # Note, we make a few assumptions in this script, like
470 # $d was not a different subvol id than $vol, and
471 # things otherwise didn't get mounted very strangely.
472 m btrfs sub snapshot
$fresh_snap $vol
473 for dir
in $d ${binds[@]}; do
477 ## arbtt disabled for now
478 # if [[ $vol == q ]]; then
479 # # maybe this will fail if X is not running
480 # x sudo -u $(id -nu 1000) XDG_RUNTIME_DIR=/run/user/1000 systemctl --user start arbtt ||:
483 stale_dir
=/nocow
/btrfs-stale
489 for dir
in /mnt
/r
7/amy
/{root
/root
,boot
/boot
}_ubuntubionic
/mnt
/{root
2/root
,boot
2/boot
}_ubuntubionic
; do
492 if [[ ! -d $root_dir ]]; then
493 # this only exists on host kd currently
496 # if latest is already mounted, make sure binds are mounted and move on
497 m check-subvol-stale
-p $dir
498 # populated by check-subvol-stale if stale
499 if ! fresh_snap
=$
(cat /nocow
/btrfs-stale
/$vol 2>/dev
/null
); then
502 if [[ -d $dir ]]; then
503 if ! kill-dir TERM TERM TERM INT INT HUP HUP TERM TERM TERM INT INT HUP HUP
; then
504 if $force; then kill-dir KILL
; fi
508 m btrfs sub snapshot
$fresh_snap $dir
509 rm -f /nocow
/btrfs-stale
/$vol
512 if (( ret
>= 1 )); then
513 echo "$0: exit status $ret. see error above"