# See the License for the specific language governing permissions and
# limitations under the License.
-script=$(readlink -f -- "$BASH_SOURCE")
+this_file="$(readlink -f -- "${BASH_SOURCE[0]}")"
+readonly this_file
cd /
-[[ $EUID == 0 ]] || exec sudo -E "$script" "$@"
+[[ $EUID == 0 ]] || exec sudo -E "$this_file" "$@"
-source /usr/local/lib/err
+source /usr/local/lib/bash-bear
usage() {
cat <<EOF
-Usage: ${0##*/} [OPTIONS]
+Usage: ${0##*/} [OPTIONS] [SUBVOLUMES]
-h|--help Print help and exit.
-f|--force Use kill -9 to try fixing unmount errors
exit $1
}
-all_vols=(q a o i ar qr)
-
+pre="mount-latest-subvol:${SSH_CLIENT:+ $HOSTNAME:}"
tu() {
while read -r line; do
}
d() {
if $verbose; then
- printf "%s\n" "$*"
+ printf "$pre %s\n" "$*"
fi
}
m() {
if $verbose; then
- printf "%s\n" "$*"
+ printf "$pre %s\n" "$*"
fi
"$@"
}
x() {
- printf "%s\n" "$*"
+ printf "$pre %s\n" "$*"
"$@"
}
shift
done
+if (( $# )); then
+ all_vols=( "$@" )
+else
+ all_vols=(q a o i ar qd qr)
+fi
+
##### end command line parsing ########
ret=0
mnt /mnt/boot2
fi
-do_o=true
root_dev=$(awk '$2 == "/" {print $1}' /etc/mtab)
mapper-dev root_dev
o_dev=$(awk '$2 == "/mnt/o" {print $1}' /etc/mtab)
mapper-dev o_dev
-if [[ $o_dev == "$root_dev" ]]; then
- do_o=false
-fi
# root2_dev=$(awk '$2 == "/mnt/root2" {print $1}' /etc/mtab)
# mapper-dev root2_dev
crypt_dev=$root_dev
else # if we are in a recovery boot, find the next best crypt device
mopts=,noauto
- do_o=false
+ # todo: I think I had an idea to not setup /o in this case,
+ # but never finished implementing it
for dev in $(dmsetup ls --target crypt | awk '{print $1}'); do
dev=/dev/mapper/$dev
if awk '{print $1}' /etc/mtab | grep -Fx $dev &>/dev/null; then
# dont tax the cpus of old laptops
-if ((`nproc` > 2)); then
+if (( $(nproc) > 2)); then
mopts+=,compress=zstd
fi
# ownership, and ssh doesn\'t allow any group writable parent
# directories, so we are forced to use a directory structure similar
# to home directories
-f=(/mnt/root/btrbk/q.*); f=${f[0]}
+fa=(/mnt/root/btrbk/q.*); f=${fa[0]}
if [[ -e $f ]]; then
fstab <<EOF
$crypt_dev /q btrfs noatime,subvol=q,gid=1000$mopts 0 0
+$crypt_dev /qd btrfs noatime,subvol=qd,gid=1000$mopts 0 0
/q/p /p none bind$mopts 0 0
EOF
fi
-f=(/mnt/root/btrbk/qr.*); f=${f[0]}
+fa=(/mnt/root/btrbk/qr.*); f=${fa[0]}
if [[ -e $f ]]; then
fstab <<EOF
$crypt_dev /qr btrfs noatime,subvol=qr$mopts 0 0
EOF
fi
-f=(/mnt/root/btrbk/ar.*); f=${f[0]}
+fa=(/mnt/root/btrbk/ar.*); f=${fa[0]}
if [[ -e $f ]]; then
fstab <<EOF
$crypt_dev /ar btrfs noatime,subvol=ar,uid=1000,gid=1000$mopts 0 0
fi
-f=(/mnt/o/btrbk/o.*); f=${f[0]}
+fa=(/mnt/o/btrbk/o.*); f=${fa[0]}
if [[ -e $f ]]; then
- fstab <<EOF
+ if [[ $o_dev != "$root_dev" ]]; then
+ fstab <<EOF
$o_dev /o btrfs noatime,subvol=o$mopts 0 0
-/o/m /m none bind$mopts 0 0
EOF
-else
- do_o=false
-fi
-
-if [[ $HOSTNAME == frodo ]]; then
+ fi
fstab <<EOF
-$crypt_dev /i btrfs noatime,subvol=i$mopts 0 0
+/o/m /m none bind$mopts 0 0
+/o/debbugs /debbugs none bind$mopts 0 0
EOF
fi
-
##### end setup fstab for subvols we care about ######
### begin get pids that this program depends on so we dont kill them
my_pids=($$ $PPID)
loop_limit=30
count=0
-while [[ ${my_pids[-1]} != 1 && ${my_pids[-1]} != ${my_pids[-2]} && $count -lt $loop_limit ]]; do
+while [[ ${my_pids[-1]} != 1 && ${my_pids[-1]} != "${my_pids[-2]}" && $count -lt $loop_limit ]]; do
count=$((count + 1))
p=$(ps -p ${my_pids[-1]} -o ppid=)
if [[ $p == 0 || ! $p ]]; then
for vol in ${all_vols[@]}; do
d=/$vol
- if ! awk '{print $2}' /etc/fstab | grep -xF $d &>/dev/null; then
+ if ! awk '$3 == "btrfs" {print $2}' /etc/fstab | grep -xF $d &>/dev/null; then
continue
fi
# eg. when r=/q/p, for lines like
# /q/p /p none bind 0 0
# output /p
- new_roots+=($(sed -rn "s#^$r/\S+\s+(\S+)\s+none\s+(\S+,|)bind[[:space:],].*#\1#p" /etc/fstab))
+ new_roots+=("$(sed -rn "s#^$r/\S+\s+(\S+)\s+none\s+(\S+,|)bind[[:space:],].*#\1#p" /etc/fstab)")
done
(( ${#new_roots} )) || break
binds+=(${new_roots[@]})
##### end building up list of bind mounts ######
+
# if latest is already mounted, make sure binds are mounted and move on
m check-subvol-stale $d
# populated by check-subvol-stale if stale
for b in ${binds[@]}; do
if mountpoint -q $b; then
bid=$(stat -c%d $b)
- if [[ $did != $bid ]]; then
+ if [[ $did != "$bid" ]]; then
umount-kill $b
fi
fi
continue
fi
+
+ ##### begin checking for loopback mounts ####
+ found_loop=false
+ for l in $(losetup -ln|awk '{print $6}'); do
+ for dir in $d ${binds[@]}; do
+ if [[ $l == $dir* ]]; then
+ echo "$0: found loopback mount $l. giving up on unmounting $dir"
+ ret=1
+ found_loop=true
+ break
+ fi
+ done
+ if $found_loop; then
+ break
+ fi
+ done
+ if $found_loop; then
+ continue
+ fi
+ ##### end end checking loopback mounts ####
+
+
## not using arbtt at the moment
# if [[ $vol == q ]]; then
# ## allow to fail, user might not be logged in
### end getting root_dir
cd $root_dir
- if [[ -e $vol ]]; then
- leaf=$vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
- m mv $vol $leaf
- m btrfs property set -ts $leaf ro true
-
- ### begin check if leaf is different, delete it if not ###
- if [[ -e /a/opt/btrfs-snapshots-diff/btrfs-snapshots-diff.py ]]; then
- source /a/bin/distro-functions/src/package-manager-abstractions
- #pi python-jmespath # dependency of btrfs-snapshots-diff
- # todo: need python3 port of btrfs-snapshots-diff, py2 no exist on nabia
+ if [[ -e $vol ]]; then
+ if [[ $vol == qd ]]; then
+ m btrfs sub del qd
+ else
+ leaf=$vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
+ m mv $vol $leaf
+ m btrfs property set -ts $leaf ro true
+
+ ### begin check if leaf is different, delete it if not ###
parentid=$(btrfs sub show $leaf | awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
bsubs=(btrbk/$vol.*)
- bsub=
+ bsub= # base subvolume
# go in reverse order as its more likely to be at the end
for ((i=${#bsubs[@]}-1; i>=0; i--)); do
if [[ $parentid == $(btrfs sub show ${bsubs[i]} | awk '$1 == "UUID:" {print $2}') ]]; then
fi
done
if [[ $bsub ]]; then
- tmp=$(mktemp)
# in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
# $ errno 32
# EPIPE 32 Broken pipe
- btrfs send --no-data -p $bsub $leaf | head -c 1000 > $tmp || [[ $? == 141 || ${PIPESTATUS[0]} == 32 ]]
- if (( $(stat -c%s $tmp) < 1000)); then
- # example output for an empty diff:
- # Found a valid Btrfs stream header, version 1
- # o.leaf.2019-05-15T14:00:50-0400;snapshot: uuid=ba045ea30737dd449003f1ee40ec12d0, ctrasid=109533, clone_uuid=3c7e3544e486834aa71d89e5b8f30056, clone_ctransid=109533
- lines=$(/a/opt/btrfs-snapshots-diff/btrfs-snapshots-diff.py -s -f $tmp | \
- grep -vxF "Found a valid Btrfs stream header, version 1" | \
- grep -cv "^[^;]*;snapshot: ") ||:
- if [[ $lines == 0 ]]; then
- # rotate in case we find a bug, weve got 2 old ones
- tmpleaf=($vol.tmpleaf2.*)
- if (( ${#tmpleaf[@]} )); then
- x btrfs sub del ${tmpleaf[@]}
- fi
- tmpleaf=($vol.tmpleaf1.*)
- if (( ${#tmpleaf[@]} )); then
- x mv ${tmpleaf[0]} $vol.tmpleaf2.${tmpleaf[0]#$vol.tmpleaf1.}
- fi
- echo suspected identical: $bsub $leaf
- x mv $leaf $vol.tmpleaf1.${leaf#$vol.leaf.}
- fi
+ lines=$(btrfs send --no-data -p $bsub $leaf | btrfs receive --dump | head -n 100 | wc -l || [[ $? == 141 || ${PIPESTATUS[0]} == 32 ]])
+ if [[ $lines == 0 ]]; then
+ # example output of no differences:
+ # snapshot ./qrtest uuid=c41ff6b7-0527-f34d-95ac-190eecf54ff5 transid=2239 parent_uuid=64949e1b-4a3e-3945-9a8e-cd7b7c15d7d6 parent_transid=2239
+ echo suspected identical: $bsub $leaf
+ x btrfs sub del $leaf
fi
fi
+ ### end check if leaf is different, delete it if not ###
+
+ ## begin expire leaf vols ##
+ leaf_vols=($vol.leaf.*)
+ count=${#leaf_vols[@]}
+ leaf_limit_time=$(( EPOCHSECONDS - 60*60*24*60 )) # 60 days
+ leaf_new_limit_time=$(( EPOCHSECONDS - 60*60*24 * 5 )) # 5 days this
+ # goes backwards from oldest. leaf_new_limit_time is a safety
+ # measure to ensure we don't delete very recent leafs.
+ for leaf in ${leaf_vols[@]}; do
+ leaf_time=$(date -d ${leaf#"$vol".leaf.} +%s)
+ if (( leaf_limit_time > leaf_time || ( leaf_new_limit_time > leaf_time && count > 30 ) )); then
+ x btrfs sub del $leaf
+ fi
+ count=$((count-1))
+ done
fi
- ### end check if leaf is different, delete it if not ###
-
- ## begin expire leaf vols ##
- leaf_vols=($vol.leaf.*)
- count=${#leaf_vols[@]}
- leaf_limit_time=$(( EPOCHSECONDS - 60*60*24*60 )) # 60 days
- leaf_new_limit_time=$(( EPOCHSECONDS - 60*60*24 )) # 1 day
- # this goes backwards from oldest. leaf_new_limit_time is just in case
- # the order gets screwed up or something.
- for leaf in ${leaf_vols[@]}; do
- leaf_time=$(date -d ${leaf#$vol.leaf.} +%s)
- if (( leaf_limit_time > leaf_time || ( leaf_new_limit_time > leaf_time && count > 15 ) )); then
- x btrfs sub del $leaf
- fi
- count=$((count-1))
- done
## end expire leaf vols ##
fi
#### end dealing with leaf vols ####
rm -f /nocow/btrfs-stale/$vol
done
+if (( ret >= 1 )); then
+ echo "$0: exit status $ret. see error above"
+fi
exit $ret
iankelling.org / git / distro-setup / blobdiff