zfs_snap_make

#!/bin/sh
# Creation de snapshots zfs au format @GMT-%Y.%m.%d-%H.%M.%S
#
# pour renommer des snapshots existants:
# for snap in $(zfs list -t snapshot -H -o name -r ZLIP-ftp/sav | grep '@\(daily\|weekly\|nightly\|monthly\)'); do
#   LOCALDATE=$(date -j -f"%a %b %e %k:%M %Y" +"%Y.%m.%d-%H.%M.%S %z" "$(zfs list -t snapshot -H -o creation $snap)")
#   GMTDATE=$(TZ=GMT date -j -f"%Y.%m.%d-%H.%M.%S %z" +%Z-%Y.%m.%d-%H.%M.%S $LOCALDATE)
#   echo "$LOCALDATE -> $GMTDATE"
#   echo "zfs rename $snap ${snap%%@*}@$GMTDATE # LOCALDATE: $LOCALDATE"
# done

usage() {
  echo "usage: $0 [-r] [-q] [-s UTC unix timestamp] [-t strftime format] [-m maxsnaps] [-c cleansnapexpr] volume|dir"
  exit 0
}

VERBOSE=1

while getopts m:qrs:t:vc:h option
do
  case $option in
    m)
      MAXSNAPS=$OPTARG
    ;;
    r)
      ZFSSNAPRECURSE="-r"
    ;;
    s)
      SNAPDATE=$OPTARG
    ;;
    t)
      TIMEFMT=$OPTARG
    ;;
    q)
      VERBOSE=0
    ;;
    v)
      VERBOSE=2
    ;;
    c)
      CLEANSNAPEXPR=$OPTARG
    ;;
    h)
      usage
    ;;
  esac
done
# shift getopt args from ARGV
shift $(expr $OPTIND - 1)

if [ $# -lt 1 ]; then
  usage
fi

if [ -n "$SNAPDATE" ]; then
  SNAPNAME=${SNAPNAME:-$(TZ=GMT date -jnu -f%s +${TIMEFMT:-GMT-%Y.%m.%d-%H.%M.%S} $SNAPDATE)}
else
  SNAPNAME=${SNAPNAME:-$(TZ=GMT date +${TIMEFMT:-GMT-%Y.%m.%d-%H.%M.%S})}
fi

for arg in $*; do
  vol=$(zfs list -H -oname $arg)
  if [ -z "$vol" ]; then
    echo "Pas de volume trouve pour $arg" >&2
    exit 1
  fi
  if /sbin/zfs list -H -t filesystem,volume $vol > /dev/null; then
    /sbin/zfs snapshot ${ZFSSNAPRECURSE:+"-r"} $vol@$SNAPNAME
    [ $VERBOSE -ge 1 ] && echo "$vol@$SNAPNAME"
  fi
done

if [ ${MAXSNAPS:-0} -gt 0 ]; then
  for snap in $(/sbin/zfs list -r -H -o name -t snapshot $vol | grep $vol'@GMT-2' | sort -rn); do
    MAXSNAPS=$(($MAXSNAPS - 1))
    if [ $MAXSNAPS -lt 0 ]; then
      /sbin/zfs destroy ${ZFSSNAPRECURSE:+"-r"} -d $snap
    fi
  done
fi

if [ -n "$CLEANSNAPEXPR" ]; then
  $(realpath $(dirname $0))/zfs_clean_snap $ZFSSNAPRECURSE ${VERBOSE:+-v $VERBOSE} $CLEANSNAPEXPR $vol
fi