# See the License for the specific language governing permissions and
# limitations under the License.
-# usage: $0 SUBVOL_MOUNTPOINT...
-#
-# In git, this is not not executable because it's meant to be installed
-# using ./install-my-scripts
-#
-# If latest subvols $@ are not mounted, exit 1, print message, and touch
-# /nocow/btrfs-stale/$subvol
-#
-# Either SUBVOL_MOUNTPOINT is a snapshot of the latest, or
-# the latest snapshot is snapshot of SUBVOL_MOUNTPOINT.
[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
shopt -s nullglob
+usage() {
+ cat <<EOF
+usage: $0 SUBVOL_MOUNTPOINT...
+
+In git, this is not not executable because it's meant to be installed
+using ./install-my-scripts
+
+If latest subvols \$@ are not mounted, exit 1, print message, and touch
+/nocow/btrfs-stale/\$subvol
+
+Either SUBVOL_MOUNTPOINT is a snapshot of the latest, or
+the latest snapshot is snapshot of SUBVOL_MOUNTPOINT.
+
+-d Enable debug output
+-h|--help Print help and exit.
+
+Note: Uses GNU getopt options parsing style
+EOF
+ exit $1
+}
+
+##### begin command line parsing ########
+
+debug=false # default
+temp=$(getopt -l help,d hd "$@") || usage 1
+eval set -- "$temp"
+while true; do
+ case $1 in
+ -d) debug=true; shift ;;
+ -h|--help) usage ;;
+ --) shift; break ;;
+ *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
+ esac
+done
+
if [[ ! $@ ]]; then
echo "$0: error: expected mountpoint argument"
fi
fi
}
+d() {
+ if $debug; then
+ printf "%s\n" "$*"
+ fi
+}
ret=0
for d; do
vol=${d##*/}
dev=$(sed -rn "s,^\s*([^#]\S*)\s+$d\s.*,\1,p" /etc/fstab|head -n1)
+ d dev=$dev
subvol_dir=$(sed -rn "s,^\s*[^#]\S*\s+$d\s.*\bsubvol=([a-zA-A/]+).*,\1,p" /etc/fstab|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
if [[ $root_dir ]]; then break; fi
done
svp=$root_dir/$subvol_dir # subvolume path
+ d svp=$svp
snaps=($root_dir/btrbk/$subvol_dir.20*) # Assumes we are in the 21st century.
if [[ ! $snaps ]]; then
fi
# get info on last received sub
- last_received_gen=0
+ 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
cgen=$(echo "$show" | sed -rn 's,^\s*Gen at creation:\s+([0-9]+).*,\1,p')
- if [[ $cgen -gt $last_received_gen ]]; then
+ if [[ $cgen -gt $last_received_cgen ]]; then
last_received_cgen=$cgen
last_received=$f
fi
fi
done
+ d last_received_cgen=$cgen
+ d last_received=$f
# Get last_snap by date.
# when a btrbk bugfix makes it into the distro,
# if there is a last_received, we can assume stale or fresh if we are newer/older
if [[ $last_received ]]; then
svp_cgen=$(btrfs sub show $svp | sed -rn 's,^\s*Gen at creation:\s+([0-9]+).*,\1,p')
+ d svp_cgen=$svp_cgen
if [[ $svp_cgen -ge $last_received_cgen ]]; then
stale=false
else