# limitations under the License.
-[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
+[[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
esac
done
-if [[ ! $@ ]]; then
+if [[ ! $1 ]]; then
echo "$0: error: expected mountpoint argument"
fi
d subvol_dir=$subvol_dir
# note, we need $dev because $d might not be mounted, and we do this loop
# because the device in fstab for the rootfs can be different.
- for devx in $(btrfs fi show $dev| sed -rn 's#.*path (/\S+)$#\1#p'); do
+ for devx in $(btrfs fil show $dev| sed -rn 's#.*path (/\S+)$#\1#p'); do
d devx=$devx
root_dir=$(sed -rn "s,^\s*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc/mtab /etc/fstab|head -n1)
if [[ $root_dir ]]; then
echo "$0: error could not find root subvol mount for $dev" >&2
exit 1
fi
- svp=$root_dir/$subvol_dir
+ svp=$root_dir/$subvol_dir # subvolume path
d "svp=$svp # subvolume path"
snaps=($root_dir/btrbk/$subvol_dir.20*) # Assumes we are in the 21st century.
- if [[ ! $snaps ]]; then
+ if [[ ! ${snaps[*]} ]]; then
# no snapshots yet
+ # TODO: make this an error and override with a cli flag
echo "$0: warning: no snapshots found at $root_dir/btrbk/$subvol_dir.20*. this is expected for a brand new volume"
continue
fi
f=${s##*/}
unix_time=$(date -d $(sed -r 's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#$vol.}) +%s)
printf "%s %s\n" $unix_time $s
- done | sort -r | head -n 1 | awk '{print $2}'
+ # sort will fail
+ done | sort -r | head -n 1 | awk '{print $2}' || [[ ${PIPESTATUS[1]} == 2 ]]
)
if [[ ! $last_snap ]]; then
# should not happen.