Centre Blaise Pascal » gZFS

#!/bin/bash

# $Id: zfs-snapshot 55 2013-10-10 16:20:06Z kreverch $

# Copyright (C) 2013 Kevin Reverchon, Loïs Taulelle

# This file/program is part of gZFS free software

# See COPYING file for details

#

BINZFS="/sbin/zfs"

BINZPOOL="/sbin/zpool"

function create_snapshot_volume {

#*** ETAPE DE CREATION DU SNAPSHOT ***#

echo ""

echo "*** Snapshot ZFS from : $NAME_VOL"

echo "*** ZFS Type : $TYPE_ZFS"

echo ""

echo "*** Snapshot Creation from $NAME_VOL"

ZDATE=$(date +%Y%m%d%H%M%S)

$BINZFS snapshot $NAME_VOL@snapshot-$ZDATE

echo ""

#*** FIN ETAPE DE CREATION DU SNAPSHOT ***#

}

function create_snapshot_filesystem {

#*** ETAPE DE CREATION DU SNAPSHOT ***#

echo ""

echo "*** Snapshot ZFS from : $NAME_VOL"

echo "*** ZFS Type : $TYPE_ZFS"

echo ""

echo "*** Snapshot Creation from $NAME_VOL"

ZDATE=$(date +%Y%m%d%H%M%S)

$BINZFS snapshot $NAME_VOL@snapshot-$ZDATE

echo ""

#*** FIN ETAPE DE CREATION DU SNAPSHOT ***#

}

function del_old_snapshot {

#*** ETAPE SUPPRESSION DES SNAPSHOTS OBSELETES ***#

echo ""

CPT_SNAP=$($BINZFS list -t snapshot -r $NAME_VOL |cut -d" " -f1 |grep -i $NAME_VOL\@ |wc -l)

echo "*** The number of snapshot to keep for $NAME_VOL is : $CPT_SNAP"

$BINZFS list -t snapshot -r $NAME_VOL 

if [ $CPT_SNAP -gt $NB_SNAP ]

then

   echo "*** Detection of the oldest snapshot "

   for ID_SNAP_OLDER in $($BINZFS list -t snapshot -r $NAME_VOL |cut -d" " -f1 |grep -i $NAME_VOL\@)

   do

      echo "*** The oldest snapshot is : $ID_SNAP_OLDER"

      break

   done

   $BINZFS destroy $ID_SNAP_OLDER

   if [ $? -eq 0 ]

   then

      echo "*** Remove the snapshot $ID_SNAP_OLDER [OK]"

   else

      echo "/!\\ Remove the snapshot $ID_SNAP_OLDER [ERROR]." 1>&2

   fi

fi

#*** FIN ETAPE SUPPRESSION DES SNAPSHOTS OBSELETES ***#

}

echo "**** $1"

if [ "$#" -eq 0 ]

then

   echo "/!\\ File Configuration missing ... /!\\" 1>&2

   exit 1

fi 

if [ ! -f $1 ]

then

   echo "/!\\ File Configuration does not exist /!\\" 1>&2

   exit 1

fi

NAME_VOL=$(cat $1 |grep "name" |cut -d"=" -f2)

TYPE_ZFS=$(cat $1 |grep "type" |cut -d"=" -f2)

NB_SNAP=$(cat $1 |grep "nbsnapshots"|cut -d"=" -f2)

if [ "$NAME_VOL" = "" ] || [ "$TYPE_ZFS" = "" ] || [ "$NB_SNAP" = "" ]

then

   echo "/!\\ Problem with the Configuration File : incoherence data or incomplete /!\\" 1>&2

   exit 1

fi

if [ "$TYPE_ZFS" == "volume" ]

then

   create_snapshot_volume

   del_old_snapshot

else

   if [ "$TYPE_ZFS" == "filesystem" ]

   then

      create_snapshot_filesystem

      del_old_snapshot

   fi

fi