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 # Name of snapshot tag file for "important" snapshots. Format:
12 # $CNO .... one line for each $CNO that should be preserved as snapshot
13 # chcp ss $CNO && echo $CNO >> $NAMELIST
14 NAMELIST=/etc/nilfs2sss.list
16 # The hour-of-day to preserve as daily snapshot
19 # The day-of-month to preserve as monthly snapshot
23 if [ -z "$DEV" ] ; then
24 DEVS=( $( mount | grep nilfs2 | sed 's/ .*//' ) )
26 if [ -z "$DEV" ] ; then
27 echo "Error* cannot find a mounted nilfs2 partition" >&2
32 FIVELY="$(date -d '-5 minutes' '+%Y-%m-%d %H:%M:%S')"
33 HOURLY="$(date -d '-1 hour' '+%Y-%m-%d %H:%M:%S')"
34 DAILY="$(date -d '-1 day' '+%Y-%m-%d %H:%M:%S')"
35 MONTHLY="$(date -d '-1 month' '+%Y-%m-%d %H:%M:%S')"
36 WEEKLY="$(date -d '-7 days' '+%Y-%m-%d %H:%M:%S')"
37 YEARLY="$(date -d '-1 year' '+%Y-%m-%d %H:%M:%S')"
41 if [[ "${MARK[0]}" == "$1" ]] && [[ "${MARK[1]}" = "$2" ]] ; then
42 if [ -r "$NAMELIST" ] && grep -q ^$3 "$NAMELIST" ; then
43 : # Don't change important snapshots
45 chcp cp $DEV ${MARK[2]}
48 MARK=( "$1" "$2" "$3" )
53 date "+$DEV: %Y-%m-%d %H:%M:%S ---- checking" >&2
54 lscp -s $DEV | while read CNO DATE TIME REST ; do
56 [ "$CNO" = "CNO" ] && continue
57 if [[ ! "$TS" > "$YEARLY" ]] ; then
58 marksnap YEAR "${DATE:0:4}" $CNO
59 elif [[ ! "$TS" > "$MONTHLY" ]] ; then
60 marksnap MONTH "${DATE:5:2}" $CNO
61 elif [[ ! "$TS" > "$WEEKLY" ]] ; then
62 # For older than most recent week, keep last snapshot each week
63 marksnap WEEK "$(( 7${DATE:8:2} / 7 - 100 ))" $CNO
64 elif [[ ! "$TS" > "$DAILY" ]] ; then
65 marksnap DAY "${DATE:8:2}" $CNO
66 elif [[ ! "$TS" > "$HOURLY" ]] ; then
67 marksnap HOUR "${DATE:8:2}-${TIME:0:2}" $CNO
69 : # echo "$CNO $DATE $TIME within last hour"
71 done | if read X ; then
72 : # snapshot within last hour
74 date "+$DEV: new snapshot at %Y-%m-%d %H:%M:%S" >&2
77 } 9> /var/run/lock/sss.lock