examples/cron_dump_to_disk/backup_rotate

   1 #!/bin/bash
   2 #
   3 # This script will redirect the backup directory to implement desired backup
   4 # schedules.
   5 #
   6 # We will use just a seven day format where we just move a link
   7 # that represents the backup directory, to point to the day of the week.
   8 #
   9
  10 #
  11 # Configuration Parameters
  12 #
  13
  14 if [ "$1" = "monthly" ]; then
  15    REALDIR="monthly"
  16 else
  17    REALDIR=`date +%A`
  18 fi
  19
  20 BACKUPPART=${BACKUPPART:-"/backup"}
  21 BACKUPDIR=${BACKUPDIR:-"current"}
  22
  23 echo "### Start of Backup Rotation ###"
  24 echo "Using backup partition: $BACKUPPART"
  25
  26 echo -n "Remounting backup partition read-write ... "
  27 if ( mount $BACKUPPART -o remount,rw &> /dev/null ) then
  28    echo "done."
  29 else
  30    echo "failure!"
  31    echo "   There were problems remounting $BACKUPPART in read-write mode!"
  32    echo "Rotation not made!"
  33    echo "### End of Backup Rotation ###"
  34    exit 1
  35 fi
  36
  37 echo -n "Checking that no directory named \"$BACKUPDIR\" exists ... "
  38 if [ -d $BACKUPPART/$BACKUPDIR -a ! -L $BACKUPPART/$BACKUPDIR ]; then
  39    echo "failure!"
  40    echo "   Directory \"$BACKUPDIR\" exists. Can't create link!"
  41    echo "Rotation not made!"
  42
  43    echo -n "Remounting backup partition read-only ... "
  44    if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
  45       echo "done."
  46    else
  47       echo "failure!"
  48       echo "   There were problems remounting $BACKUPPART in read-only mode!"
  49       echo "### End of Backup Rotation ###"
  50       exit 1
  51    fi
  52    echo "### End of Backup Rotation ###"
  53    exit 1
  54 else
  55    echo "done."
  56 fi
  57
  58 cd $BACKUPPART
  59
  60 echo -n "Creating link: $BACKUPDIR --> $REALDIR ... "
  61 if ( ln -snf $REALDIR $BACKUPDIR &> /dev/null ) then
  62    echo "done."
  63 else
  64    echo "failure!"
  65    echo "   There were problems creating link!"
  66    echo "Rotation not made!"
  67
  68    echo -n "Remounting backup partition read-only ... "
  69    if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
  70       echo "done."
  71    else
  72       echo "failure!"
  73       echo "   There were problems remounting $BACKUPPART in read-only mode!"
  74       echo "### End of Backup Rotation ###"
  75       exit 1
  76    fi
  77    echo "### End of Backup Rotation ###"
  78    exit 1
  79 fi
  80
  81 echo -n "Remounting backup partition read-only ... "
  82 if ( mount $BACKUPPART -o remount,ro &> /dev/null ) then
  83    echo "done."
  84 else
  85    echo "failure!"
  86    echo "   There were problems remounting $BACKUPPART in read-only mode!"
  87    echo "### End of Backup Rotation ###"
  88    exit 1
  89 fi
  90 echo "### End of Backup Rotation ###"