3 # Snapshot Snapping Scheme
5 # This is a cron bot to manage the snapshots of an nilfs2 file system,
6 # so as to preserve 7 most recent daily, 4 most recent weekly and 12
7 # most recent monthly snapshots, in addition to labelled ones.
9 # The cron bot is expected to run once a minute
11 # The hour-of-day to preserve as daily snapshot
14 # The day-of-month to preserve as monthly snapshot
18 if [ -z "$DEV" ] ; then
19 DEVS=( $( mount | grep nilfs2 | sed 's/ .*//' ) )
21 if [ -z "$DEV" ] ; then
22 echo "Error* cannot find a mounted nilfs2 partition" >&2
27 FIVELY="$(date -d '-5 minutes' '+%Y-%m-%d %H:%M:%S')"
28 HOURLY="$(date -d '-1 hour' '+%Y-%m-%d %H:%M:%S')"
29 DAILY="$(date -d '-1 day' '+%Y-%m-%d %H:%M:%S')"
30 MONTHLY="$(date -d '-1 month' '+%Y-%m-%d %H:%M:%S')"
31 WEEKLY="$(date -d '-7 days' '+%Y-%m-%d %H:%M:%S')"
32 YEARLY="$(date -d '-1 year' '+%Y-%m-%d %H:%M:%S')"
36 if [[ "${MARK[0]}" == "$1" ]] && [[ "${MARK[1]}" = "$2" ]] ; then
37 chcp cp $DEV ${MARK[2]}
39 MARK=( "$1" "$2" "$3" )
44 date "+$DEV: %Y-%m-%d %H:%M:%S ---- checking" >&2
45 lscp -s $DEV | while read CNO DATE TIME REST ; do
47 [ "$CNO" = "CNO" ] && continue
48 if [[ ! "$TS" > "$YEARLY" ]] ; then
49 marksnap YEAR "${DATE:0:4}" $CNO
50 elif [[ ! "$TS" > "$MONTHLY" ]] ; then
51 marksnap MONTH "${DATE:5:2}" $CNO
52 elif [[ ! "$TS" > "$WEEKLY" ]] ; then
53 # For older than most recent week, keep last snapshot each week
54 marksnap WEEK "$(( 7${DATE:8:2} / 7 - 100 ))" $CNO
55 elif [[ ! "$TS" > "$DAILY" ]] ; then
56 marksnap DAY "${DATE:8:2}" $CNO
57 elif [[ ! "$TS" > "$HOURLY" ]] ; then
58 marksnap HOUR "${DATE:8:2}-${TIME:0:2}" $CNO
60 echo "$CNO $DATE $TIME within last hour"
62 done | if read X ; then
63 : # snapshot within last hour
65 date "+$DEV: new snapshot at %Y-%m-%d %H:%M:%S" >&2
68 } 9> /var/run/lock/sss.lock