# See the License for the specific language governing permissions and
# limitations under the License.
-# usage: mount-latest-subvol
-#
-# Note, at source location, intentionally not executable, run and read
-# install-my-scripts.
-
+script=$(readlink -f -- "$BASH_SOURCE")
cd /
-[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
+[[ $EUID == 0 ]] || exec sudo -E "$script" "$@"
+
+
+usage() {
+ cat <<EOF
+Usage: ${0##*/} [OPTIONS]
+
+-h|--help Print help and exit.
+
+
+Note, at source location, intentionally not executable, run and read
+install-my-scripts.
+
+Note: Uses util-linux getopt option parsing: spaces between args and
+options, short options can be combined, options before args.
+EOF
+ exit $1
+}
+
errcatch() {
set -E; shopt -s extdebug
grep -xFq "$line" "$file" || tee -a "$file"<<<"$line"
done
}
-e() { printf "%s\n" "$*"; "$@"; }
+m() {
+ if $verbose; then
+ printf "%s\n" "$*"
+ fi
+ "$@"
+}
+x() {
+ printf "%s\n" "$*"
+ "$@"
+}
+
mnt() {
dir=$1
- if ! mountpoint $dir &>/dev/null; then
+ if ! mountpoint -q $dir; then
mkdir -p $dir
- e mount $dir
+ m mount $dir
fi
}
fstab() {
return 1
}
+##### begin command line parsing ########
+
+# you can remove this if you do not have options which can have args with spaces or empty.
+
+verbose=false
force=false
-if [[ $1 == -f ]]; then
- force=true
-fi
+temp=$(getopt -l help,force,verbose hfv "$@") || usage 1
+eval set -- "$temp"
+while true; do
+ case $1 in
+ -f|--force) force=true ;;
+ -v|--verbose) verbose=true ;;
+ -h|--help) usage ;;
+ --) shift; break ;;
+ *) echo "$0: unexpected args: $*" >&2 ; usage 1 ;;
+ esac
+ shift
+done
+
+##### end command line parsing ########
ret=0
root_dev=$(awk '$2 == "/" {print $1}' /etc/mtab)
if [[ $root_dev == /dev/dm-* ]]; then
for d in /dev/mapper/*; do
- if [[ $(readlink -f $d) == $root_dev ]]; then
+ if [[ $(readlink -f $d) == "$root_dev" ]]; then
root_dev=$d
break
fi
# ownership, and ssh doesn\'t allow any group writable parent
# directories, so we are forced to use a directory structure similar
# to home directories
-f=(/mnt/root/btrbk/q.*)
+f=(/mnt/root/btrbk/q.*); f=${f[0]}
if [[ -e $f ]]; then
fstab <<EOF
$crypt_dev /q btrfs noatime,subvol=q,gid=1000$noauto 0 0
EOF
fi
-f=(/mnt/root/btrbk/o.*)
+f=(/mnt/root/btrbk/o.*); f=${f[0]}
if [[ -e $f ]]; then
fstab <<EOF
$crypt_dev /o btrfs noatime,subvol=o$noauto 0 0
# if latest is already mounted, make sure binds are mounted and move on
- e check-subvol-stale $d
+ m check-subvol-stale $d
# populated by check-subvol-stale if stale
if ! fresh_snap=$(cat /nocow/btrfs-stale/$vol 2>/dev/null); then
mnt $d
umount_ret=true
unmounted=()
for dir in $(echo $d ${binds[*]}\ |tac -s\ ); do
- if mountpoint $dir; then
- if e umount -R $dir; then
+ if mountpoint -q $dir; then
+ if m umount -R $dir; then
unmounted+=($dir)
else
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
+ if m umount -R $dir; then
unmounted+=($dir)
else
echo "$0: failed to umount $dir"
# todo: decipher /mnt/root, like we do in check-subvol-stale
cd /mnt/root
if [[ -e $vol ]]; then
- e mv $vol $vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
+ leaf=$vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
+ m mv $vol $leaf
+ m btrfs property set -ts $leaf ro true
+
+ ### begin check if leaf is different, delete it if not ###
+ if [[ -e /a/opt/btrfs-snapshots-diff/btrfs-snapshots-diff.py ]]; then
+ parentid=$(btrfs sub show $leaf | awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
+ bsubs=(/mnt/root/btrbk/$vol.*)
+ bsub=
+ # 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 $2}') ]]; then
+ bsub=${bsubs[i]}
+ break
+ fi
+ done
+ if [[ $bsub ]]; then
+ tmp=$(mktemp)
+ # in testing, same subvol is 136 bytes. allow some overhead
+ btrfs send --no-data -p $bsub $leaf | head -c 1000 > $tmp
+ 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
+ x btrfs sub del $leaf
+ fi
+ fi
+ fi
+ fi
+ ### end check if leaf is different, delete it if not ###
+
+ ## begin expire leaf vols ##
leaf_vols=($vol.leaf.*)
+ count=1
for leaf in ${leaf_vols[@]}; do
leaf_secs=$(date -d ${leaf#$vol.leaf.} +%s)
- if (( $(date +%s) - 60*60*24*60 > leaf_secs )); then # 60 days
- e btrfs sub del $leaf
+ if (( $(date +%s) - 60*60*24*60 > leaf_secs || count > 200 )); then # 60 days
+ x btrfs sub del $leaf
fi
+ count=$((count+1))
done
+ ## end expire leaf vols ##
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 $fresh_snap $vol
+ m btrfs sub snapshot $fresh_snap $vol
for dir in $d ${binds[@]}; do
- e mnt $dir
+ m mnt $dir
done
stale_dir=/nocow/btrfs-stale
rm -f $stale_dir/$d
iankelling.org / git / distro-setup / blobdiff