2 # Copyright (C) 2016 Ian Kelling
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
16 this_file
="$(readlink -f -- "${BASH_SOURCE[0]}")"
19 [[ $EUID == 0 ]] ||
exec sudo
-E "$this_file" "$@"
21 source /usr
/local
/lib
/err
25 Usage: ${0##*/} [OPTIONS] [SUBVOLUMES]
27 -h|--help Print help and exit.
28 -f|--force Use kill -9 to try fixing unmount errors
29 -v|--verbose Be more verbose
32 Note: In git this is not not executable because it's meant to be installed
33 using ./install-my-scripts
35 Note: Uses util-linux getopt option parsing: spaces between args and
36 options, short options can be combined, options before args.
44 while read -r line
; do
46 grep -xFq "$line" "$file" ||
tee -a "$file"<<<"$line"
67 if ! mountpoint
-q $dir; then
73 while read -r start mpoint end
; do
74 l
="$start $mpoint $end"
75 # kill off any lines that duplicate the mount point.
76 sed --follow-symlinks -ri "\%$l%b;\%^\s*\S+\s+$mpoint\s%d" /etc
/fstab
82 for m
in ${my_pids[@]}; do
84 echo "$0: error: pids to kill includes our pid or a parent. ps output:" >&2
95 if pids
=$
(timeout
4 lsof
-t $dir); then
97 timeout
4 lsof
-w $dir
101 # fuser will find open sockets that lsof won't, for example from gpg-agent.
102 # note: -v shows kernel processes, which then doesn't return true when we want
103 if pids
=$
(timeout
4 fuser
-m $dir 2>/dev
/null
); then
106 fuser
-$sig -mvk $dir
109 if ! $found_pids; then
117 if mountpoint
-q $dir; then
118 if m umount
-R $dir; then
121 if ! kill-dir TERM TERM TERM INT INT HUP HUP TERM TERM TERM INT INT HUP HUP
; then
122 if $force; then kill-dir KILL
; fi
125 if m umount
-R $dir; then
128 echo "$0: failed to umount $dir"
136 # duplicated in check-subvol
137 # Reassign $1 var from /dev/dm- to corresponding /dev/mapper/
141 if [[ $devref == /dev
/dm-
* ]]; then
142 for mapdev
in /dev
/mapper
/*; do
143 if [[ $
(readlink
-f $mapdev) == "$devref" ]]; then
152 ##### begin command line parsing ########
154 # you can remove this if you do not have options which can have args with spaces or empty.
158 temp
=$
(getopt
-l help,force
,verbose hfv
"$@") || usage
1
162 -f|
--force) force
=true
;;
163 -v|
--verbose) verbose
=true
;;
166 *) echo "$0: unexpected args: $*" >&2 ; usage
1 ;;
174 all_vols
=(q a o i
ar qr
)
177 ##### end command line parsing ########
181 ##### begin setup fstab for subvols we care about ######
183 if [[ -e /mnt
/root
/root2-crypttab
]]; then
184 tu
/etc
/crypttab
</mnt
/root
/root2-crypttab
185 while read -r mapper_dev _
; do
186 if [[ ! -e /dev
/mapper
/$mapper_dev ]]; then
187 m cryptdisks_start
$mapper_dev
189 done < <(cat /mnt
/root
/root2-crypttab
)
191 if [[ -e /mnt
/root
/root2-fstab
]]; then
192 tu
/etc
/fstab
</mnt
/root
/root2-fstab
197 root_dev
=$
(awk '$2 == "/" {print $1}' /etc
/mtab
)
199 o_dev
=$
(awk '$2 == "/mnt/o" {print $1}' /etc
/mtab
)
203 # root2_dev=$(awk '$2 == "/mnt/root2" {print $1}' /etc/mtab)
204 # mapper-dev root2_dev
205 # # dont bother with the above for crypt2_dev
206 # crypt2_dev=$root2_dev
209 if cryptsetup status
$root_dev &>/dev
/null
; then
211 else # if we are in a recovery boot, find the next best crypt device
213 # todo: I think I had an idea to not setup /o in this case,
214 # but never finished implementing it
215 for dev
in $
(dmsetup
ls --target crypt |
awk '{print $1}'); do
217 if awk '{print $1}' /etc
/mtab |
grep -Fx $dev &>/dev
/null
; then
226 # dont tax the cpus of old laptops
227 if (( $
(nproc
) > 2)); then
228 mopts
+=,compress=zstd
232 $crypt_dev /a btrfs noatime,subvol=a$mopts 0 0
237 # ssh and probably some other things care about parent directory
238 # ownership, and ssh doesn\'t allow any group writable parent
239 # directories, so we are forced to use a directory structure similar
240 # to home directories
241 fa
=(/mnt
/root
/btrbk
/q.
*); f
=${fa[0]}
244 $crypt_dev /q btrfs noatime,subvol=q,gid=1000$mopts 0 0
245 /q/p /p none bind$mopts 0 0
249 fa
=(/mnt
/root
/btrbk
/qr.
*); f
=${fa[0]}
252 $crypt_dev /qr btrfs noatime,subvol=qr$mopts 0 0
256 fa
=(/mnt
/root
/btrbk
/ar.
*); f
=${fa[0]}
259 $crypt_dev /ar btrfs noatime,subvol=ar,uid=1000,gid=1000$mopts 0 0
264 fa
=(/mnt
/o
/btrbk
/o.
*); f
=${fa[0]}
266 if [[ $o_dev != "$root_dev" ]]; then
268 $o_dev /o btrfs noatime,subvol=o$mopts 0 0
272 /o/m /m none bind$mopts 0 0
277 ##### end setup fstab for subvols we care about ######
279 ### begin get pids that this program depends on so we dont kill them
283 while [[ ${my_pids[-1]} != 1 && ${my_pids[-1]} != "${my_pids[-2]}" && $count -lt $loop_limit ]]; do
285 p=$(ps -p ${my_pids[-1]} -o ppid=)
286 if [[ $p == 0 || ! $p ]]; then
291 ### end get pids that this program depends on so we dont kill them
293 for vol in ${all_vols[@]}; do
295 if ! awk '$3 == "btrfs
" {print $2}' /etc/fstab | grep -xF $d &>/dev/null; then
300 ##### begin building up list of bind mounts ######
301 binds=() # list of bind mounts
305 for r in ${roots[@]}; do
306 # eg. when r=/q/p, for lines like
307 # /q/p /p none bind 0 0
309 new_roots+=("$
(sed -rn "s#^$r/\S+\s+(\S+)\s+none\s+(\S+,|)bind[[:space:],].*#\1#p" /etc
/fstab
)")
311 (( ${#new_roots} )) || break
312 binds+=(${new_roots[@]})
313 # roots is used to recursively find binds of binds if they exist.
314 roots=( ${new_roots[@]} )
316 ##### end building up list of bind mounts ######
319 # if latest is already mounted, make sure binds are mounted and move on
320 m check-subvol-stale $d
321 # populated by check-subvol-stale if stale
322 if ! fresh_snap=$(cat /nocow/btrfs-stale/$vol 2>/dev/null); then
325 for b in ${binds[@]}; do
326 if mountpoint -q $b; then
328 if [[ $did != "$bid" ]]; then
337 ## not using arbtt at the moment
338 # if [[ $vol == q ]]; then
339 # ## allow to fail, user might not be logged in
340 # x sudo -u $(id -nu 1000) XDG_RUNTIME_DIR=/run/user/1000 systemctl --user stop arbtt ||:
344 for dir in $(echo $d ${binds[*]}\ |tac -s\ ); do
348 # if we unmounted some but not all, restore them and move on
349 if ! $umount_ret; then
350 for dir in ${unmounted[@]}; do
356 #### begin dealing with leaf vols ####
358 ### begin getting root_dir
359 ### this is duplicated in check-subvol-stale
361 dev=$(sed -rn "s
,^\s
*([^
#]\S*)\s+$d\s.*,\1,p" /etc/fstab /etc/mtab|head -n1)
363 # note, we need $dev because $d might not be mounted, and we do this loop
364 # because the device in fstab for the rootfs can be different.
365 for devx
in $
(btrfs fil show
$dev|
sed -rn 's#.*path (\S+)$#\1#p'); do
366 if [[ $devx == dm-
* ]]; then
371 root_dir
=$
(sed -rn "s,^\s*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc
/mtab
/etc
/fstab|
head -n1)
372 if [[ $root_dir ]]; then
377 if [[ ! $root_dir ]]; then
378 echo "$0: error could not find root subvol mount for $dev" >&2
381 ### end getting root_dir
384 if [[ -e $vol ]]; then
385 leaf
=$vol.leaf.$
(date +%Y-
%m-
%dT
%H
:%M
:%S
%z
)
387 m btrfs property
set -ts $leaf ro true
389 ### begin check if leaf is different, delete it if not ###
390 parentid
=$
(btrfs sub show
$leaf |
awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
392 bsub
= # base subvolume
393 # go in reverse order as its more likely to be at the end
394 for ((i
=${#bsubs[@]}-1; i
>=0; i--
)); do
395 if [[ $parentid == $
(btrfs sub show
${bsubs[i]} |
awk '$1 == "UUID:" {print $2}') ]]; then
401 # in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
403 # EPIPE 32 Broken pipe
404 lines
=$
(btrfs send
--no-data -p $bsub $leaf | btrfs receive
--dump |
head -n 100 |
wc -l ||
[[ $?
== 141 ||
${PIPESTATUS[0]} == 32 ]])
405 if [[ $lines == 0 ]]; then
406 # example output of no differences:
407 # snapshot ./qrtest uuid=c41ff6b7-0527-f34d-95ac-190eecf54ff5 transid=2239 parent_uuid=64949e1b-4a3e-3945-9a8e-cd7b7c15d7d6 parent_transid=2239
408 echo suspected identical
: $bsub $leaf
409 x btrfs sub del
$leaf
412 ### end check if leaf is different, delete it if not ###
414 ## begin expire leaf vols ##
415 leaf_vols
=($vol.leaf.
*)
416 count
=${#leaf_vols[@]}
417 leaf_limit_time
=$
(( EPOCHSECONDS
- 60*60*24*60 )) # 60 days
418 leaf_new_limit_time
=$
(( EPOCHSECONDS
- 60*60*24 * 5 )) # 5 days this
419 # goes backwards from oldest. leaf_new_limit_time is a safety
420 # measure to ensure we don't delete very recent leafs.
421 for leaf
in ${leaf_vols[@]}; do
422 leaf_time
=$
(date -d ${leaf#"$vol".leaf.} +%s
)
423 if (( leaf_limit_time
> leaf_time ||
( leaf_new_limit_time
> leaf_time
&& count
> 30 ) )); then
424 x btrfs sub del
$leaf
428 ## end expire leaf vols ##
430 #### end dealing with leaf vols ####
432 # Note, we make a few assumptions in this script, like
433 # $d was not a different subvol id than $vol, and
434 # things otherwise didn't get mounted very strangely.
435 m btrfs sub snapshot
$fresh_snap $vol
436 for dir
in $d ${binds[@]}; do
440 ## arbtt disabled for now
441 # if [[ $vol == q ]]; then
442 # # maybe this will fail if X is not running
443 # x sudo -u $(id -nu 1000) XDG_RUNTIME_DIR=/run/user/1000 systemctl --user start arbtt ||:
446 stale_dir
=/nocow
/btrfs-stale
452 for dir
in /mnt
/r
7/amy
/{root
/root
,boot
/boot
}_ubuntubionic
/mnt
/{root
2/root
,boot
2/boot
}_ubuntubionic
; do
455 if [[ ! -d $root_dir ]]; then
456 # this only exists on host kd currently
459 # if latest is already mounted, make sure binds are mounted and move on
460 m check-subvol-stale
-p $dir
461 # populated by check-subvol-stale if stale
462 if ! fresh_snap
=$
(cat /nocow
/btrfs-stale
/$vol 2>/dev
/null
); then
465 if [[ -d $dir ]]; then
466 if ! kill-dir TERM TERM TERM INT INT HUP HUP TERM TERM TERM INT INT HUP HUP
; then
467 if $force; then kill-dir KILL
; fi
471 m btrfs sub snapshot
$fresh_snap $dir
472 rm -f /nocow
/btrfs-stale
/$vol
476 echo "$0: exit status $ret. see error above"