# 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 "$0: error: expected mountpoint argument"
fi
vol=${d##*/}
# second field, non-comment line == $d
dev=$(sed -rn "s,^\s*([^#]\S*)\s+$d\s.*,\1,p" /etc/fstab /etc/mtab|head -n1)
+
d dev=$dev
subvol_dir=$(sed -rn "s,^\s*[^#]\S*\s+$d\s.*\bsubvol=([a-zA-A/]+).*,\1,p" /etc/fstab /etc/mtab|head -n1)
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*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc/mtab|head -n1)
+ root_dir=$(sed -rn "s,^\s*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc/mtab /etc/fstab|head -n1)
if [[ $root_dir ]]; then
d root_dir=$root_dir
break
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
# get info on last received sub
+ last_received=
last_received_cgen=0
for f in ${snaps[@]}; do
show="$(btrfs sub show $f)"
if echo "$show" | grep -E "Received UUID:\s+[[:alnum:]]" &>/dev/null; then
+ d found received uuid in $f
cgen=$(echo "$show" | sed -rn 's,^\s*Gen at creation:\s+([0-9]+).*,\1,p')
if [[ $cgen -gt $last_received_cgen ]]; then
last_received_cgen=$cgen
fi
fi
done
- d last_received_cgen=$cgen
- d last_received=$f
+ d last_received_cgen=$last_received_cgen
+ d last_received=$last_received
# Get last_snap by date.
# when a btrbk bugfix makes it into the distro,
echo "$0: error: could not find latest snapshot for $svp among ${snaps[*]}" >&2
exit 1
fi
+ d last_snap=$last_snap
if [[ ! -e $svp ]]; then
echo "$0: warning: subvol does not exist: $svp"
if [[ $svp_cgen -ge $last_received_cgen ]]; then
stale=false
else
- echo "$svp stale: it's gen at creation, $svp_cgen, is earlier than the last received snapshot, $last_received's gen at creation: $last_received_cgen"
+ d "$svp stale: it's gen at creation, $svp_cgen, is earlier than the last received snapshot, $last_received's gen at creation: $last_received_cgen"
freshest_snap=$last_received
stale=true
fi
stale=true
# fresh if $svp has $last_snap as a snapshot,
if btrfs sub show $svp 2>/dev/null | sed '0,/^\s*Snapshot(s):/d;s/^\s*//' | \
- grep -xF btrbk/$last_snap &>/dev/null; then
+ grep -xF ${last_snap#$root_dir/} ; then
stale=false
else # or else $svp is a snapshot of $last_snap. we use a uuid
# comparison, which if I remember from the docs, is a bit more