+
+
+ ## check if last snapshot was recent
+ old_snap_limit=$(( 3 * 60 * 60 ))
+ for vol in a o q; do
+ case $vol in
+ o) btrbk_root=/mnt/o/btrbk ;;
+ *) btrbk_root=/mnt/root/btrbk ;;
+ esac
+ # this section generally copied from btrbk scripts, but
+ # this part modified to speed things up by about half a second.
+ # I'm not sure if its quite as reliable, but it looks pretty safe.
+ # Profiled it using time and also adding to the top of the file:
+ # set -x
+ # PS4='+ $(date "+%2N") '
+ # allow failure in case there are no snapshots yet.
+ # shellcheck disable=SC2012
+ shopt -u nullglob
+ files=($btrbk_root/$vol.20*)
+ shopt -s nullglob
+ snaps=()
+ if (( ${#files[@]} )); then
+ snaps=($(ls -1avdr "${files[@]}" 2>/dev/null |head -n1 || : ))
+ fi
+ now=$EPOCHSECONDS
+ maxtime=0
+ for s in ${snaps[@]}; do
+ file=${s##*/}
+ t=$(date -d $(sed -r 's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${file#$vol.}) +%s)
+ if (( t > maxtime )); then
+ maxtime=$t
+ fi
+ done
+ snapshotmsg=
+ last_snap_age=$(( now - maxtime ))
+ last_snap_hours=$(( last_snap_age / 60 / 60 ))
+ if (( last_snap_age > old_snap_limit )); then
+ chars+=(OLD-SNAP-${last_snap_hours}h)
+ snapshotmsg="/$vol snapshot older than 4 hours"
+ if [[ $MAIL_HOST == "$HOSTNAME" ]]; then
+ p "$snapshotmsg" | lo -1 old-snapshot
+ fi
+ # not bothering to get info on all volumes if we find an old one.
+ break
+ fi
+ done
+
+