Make snapshotLC sh

1. !/bin/bash
2. ----------------------------------------------------------------------
   1. (c) 2007, Pfalzwolf for www.linux-club.de
   2. Idea:
   3. Mike Rubel 2004.01.04
   5. License:
   6. use this software on your own risk, it works for me but there
   7. are no guaranties at all
   8. ----------------------------------------------
   10. make_snapshot:
   11. Backup Script based on rsync
   12. It creates Generation Backups for the levels daily, weekly and montly
   14. Version:
   15. 0.3
   17. Synopsis:
   18. make_snapshot [OPTIONS]
   20. Description:
   21. This script was adopted from Mike Rubels documentation from
   22. http://www.mikerubel.org/computers/rsync_snapshots/
   23. Based on Mikes handy rotating-filesystem-snapshot utility.
   24. The basic idea is it makes rotating backup-snapshots of /home whenever called
   25. A few elements came from
   26. http://www.heinlein-support.de/web/support/wissen/rsync-backup/
   27. An exclude list avoids to backup superflous files.
   29. Changes:
   30. Instead of hourly, daily and weekly snapshots, daily, weekly and monthly
   31. snapshots are used.
   32. Checking the available space on backup media
   33. Free configurable number of snapshots for every single level
   34. Everything packed into one script
   36. Options:
   37. -d make the daily backup plus rotate
   38. -w make the weekly backup
   39. -m make the monthly backup
   40. -h displays a short help text
   42. Changelog:
   43. --------

unset PATH # suggestion from H. Milz: avoid accidental use of $PATH

1. ------------- System Commands used by this script --------------------

ID=/usr/bin/id; ECHO=/bin/echo; MOUNT=/bin/mount; RM=/bin/rm; MV=/bin/mv; CP=/bin/cp; TOUCH=/bin/touch; RSYNC=/usr/bin/rsync; DF=/bin/df; TAIL=/usr/bin/tail; SED=/bin/sed; SYNC=/bin/sync; LOGGER=/bin/logger; CHMOD=/bin/chmod; MKDIR=/bin/mkdir;

1. ======================= CUSTOMIZING SECTION ==========================

MOUNT_DEVICE=/dev/sda2; # Your Mount device MOUNT_RO=false; # For write protection set to true SNAPSHOT_RW=/DASI/TEST; # where to store the backups EXCLUDES=/home/wolf/nobackup/backup_exclude; # Create the backup_exclude file first! CHECK_HDMINFREE=true; # Check free space HDMINFREE=93; # Make a backup up to this percentage DAYS=3; # Number of daily backups -1 WEEKS=2; # Number of weekly backups -1 MONTHS=3; # Number of monthly backups -1

1. ======================================================================

1. Make sure we're running as root

if (( `$ID -u` != 0 )); then { $ECHO "Sorry, must be root. Exiting..."; exit; } fi

1. Check Argument

if [ $# != 1 ] ; then { $ECHO "Error: Wrong number of arguments. \ Vaild is one out of -d, -w, -m, -h" ; exit; } fi

1. Check Customization

if ! [ -b $MOUNT_DEVICE ] ; then { $ECHO "Error: Mount device $EXCLUDES isn't valid" ; exit; } fi if ! [ -d $SNAPSHOT_RW ] ; then { $ECHO "Error: Backup Directory $SNAPSHOT_RW missing"; exit; } fi if ! [ -d $SNAPSHOT_RW/home ] ; then $MKDIR -p $SNAPSHOT_RW/home; fi if ! [ -f $EXCLUDES ] ; then { $ECHO "Error: Exclude File $EXCLUDES missing" ; exit; } fi

1. Check free space on disk

GETPERCENTAGE='s/.* \([0-9]\{1,3\}\)%.*/\1/'; if $CHECK_HDMINFREE ; then KBISFREE=`$DF /$SNAPSHOT_RW | $TAIL -n1 | $SED -e "$GETPERCENTAGE"` if [ $KBISFREE -ge $HDMINFREE ] ; then $ECHO "Error: Not enough space left for rotating backups!" $LOGGER "Error: Not enough space left for rotating backups!" exit fi fi

1. ------------- The Script itself --------------------------------------

if $MOUNT_RO ; then # Attempt to remount the RW mount point as RW; else abort $MOUNT -o remount,rw $MOUNT_DEVICE $SNAPSHOT_RW ; if (( $? )); then $ECHO "Error: could not remount $SNAPSHOT_RW readwrite";

		exit;

fi; fi;

case $1 in

1. *********** Daily Backups ********************************************

-d | -D) $ECHO "Starting Daily Backup..." # Rotating daily snapshots of /home

# Step 1: Delete the oldest snapshot, if it exists: # It is NOT moved to the weekly backups level since you can make hundreds of daily backups if [ -d $SNAPSHOT_RW/home/daily.$DAYS ] ; then $RM -rf $SNAPSHOT_RW/home/daily.$DAYS ; fi;

# Step 2: Shift all other snapshots(s) by one, if they exist (e.g. 6->7...1->2) OLD=$DAYS; while [ $OLD -ge 2 ] ; do OLD=$[$OLD-1] if [ -d $SNAPSHOT_RW/home/daily.$OLD ] ; then NEW=$[ $OLD + 1 ]

			# Save date

$TOUCH $SNAPSHOT_RW/.timestamp -r $SNAPSHOT_RW/home/daily.$OLD

             		$MV $SNAPSHOT_RW/home/daily.$OLD $SNAPSHOT_RW/home/daily.$NEW

# Restore date $TOUCH $SNAPSHOT_RW/home/daily.$NEW/.timestamp \ -r $SNAPSHOT_RW/.timestamp fi; done

# Step 3: make a hard-link-only (except for dirs) copy of the latest snapshot, # If that exists 0->1 if ! [ -d $SNAPSHOT_RW/home/daily.0 ] ; then $MKDIR -p $SNAPSHOT_RW/home/daily.0 $TOUCH $SNAPSHOT_RW/home/daily.0/.timestamp else $CP -al $SNAPSHOT_RW/home/daily.0 $SNAPSHOT_RW/home/daily.1 ; fi;

# Step 4: rsync from the system into the latest snapshot (notice that # rsync behaves like cp --remove-destination by default, so the destination # is unlinked first. If it were not so, this would copy over the other # snapshot(s) too! $RSYNC \ -va --delete --delete-excluded \ --exclude-from="$EXCLUDES" \ /home/ $SNAPSHOT_RW/home/daily.0 ;

# Check return code # 0 = ok, # 24 is also ok. It appears if files were changed or deleted while this script runs # Other return codes are Error -- see man (1) rsync if ! [ $? = 24 -o $? = 0 ] ; then $ECHO "Error: rsync finished on $MOUNT_DEVICE with errors!" $LOGGER "Error: rsync finished on $MOUNT_DEVICE with errors!" fi;

# Step 5: update the mtime of daily.0 to reflect the snapshot time $TOUCH $SNAPSHOT_RW/home/daily.0 ;

# Finished! $ECHO "Finished rsync backup on $MOUNT_DEVICE..." $LOGGER "Finished rsync backup on $MOUNT_DEVICE..."

# For beeing on the secure site... $SYNC;;

# And thats it for home.

1. *********** Weekly Backup ********************************************

-w | -W)$ECHO "Starting Weekly Backup..."

# Step 1: Delete the oldest snapshot, if it exists if [ -d $SNAPSHOT_RW/home/weekly.$WEEKS ] ; then $RM -rf $SNAPSHOT_RW/home/weekly.$WEEKS ; fi;

# Step 2: shift the middle snapshots(s) by one, if they exist 3->4 ..0->1 OLD=$WEEKS; while [ $OLD -ge 1 ] ; do OLD=$[$OLD-1] if [ -d $SNAPSHOT_RW/home/weekly.$OLD ] ; then NEW=$[ $OLD + 1 ] $MV $SNAPSHOT_RW/home/weekly.$OLD $SNAPSHOT_RW/home/weekly.$NEW ; fi; done

# Step 3: Make a hard-link-only (except for dirs) copy of # daily.(max), assuming that exists, into weekly.0 if [ -d $SNAPSHOT_RW/home/daily.$DAYS ] ; then $CP -al $SNAPSHOT_RW/home/daily.$DAYS $SNAPSHOT_RW/home/weekly.0 ; fi;;

1. *********** Monthly Backup *******************************************

-m | -M)$ECHO "Starting Monthly Backup..."

# Step 1: Delete the oldest snapshot, if it exists if [ -d $SNAPSHOT_RW/home/monthly.$MONTHS ] ; then $RM -rf $SNAPSHOT_RW/home/monthly.$MONTHS ; fi;

# Step 2: Shift the middle snapshots(s) by one, if they exist 6->7 ..0->1 OLD=$MONTHS; while [ $OLD -ge 1 ] ; do OLD=$[$OLD-1] if [ -d $SNAPSHOT_RW/home/monthly.$OLD ] ; then NEW=$[ $OLD + 1 ] $MV $SNAPSHOT_RW/home/monthly.$OLD $SNAPSHOT_RW/home/monthly.$NEW ; fi; done

# Step 3: Make a hard-link-only (except for dirs) copy of # weekly.(max), assuming that exists, into monthly.0 if [ -d $SNAPSHOT_RW/home/weekly.$WEEKS ] ; then $CP -al $SNAPSHOT_RW/home/weekly.$WEEKS $SNAPSHOT_RW/home/monthly.0 ; fi;;

-h | -H)$ECHO "Usage: make_snapshot -d Initiates daily backup make_snapshot -w Initiates weekly backup make_snapshot -m Initiates monthly backup make_snapshot -h Displays this text."; exit;;

*) $ECHO "Error: Wrong argument. Vaild is one out of -d, -w, -m, -h" ; exit;;

esac

$ECHO "Backup ended" if $MOUNT_RO ; then # Now remount the RW snapshot mountpoint as readonly $MOUNT -o remount,ro $MOUNT_DEVICE $SNAPSHOT_RW ; if (( $? )); then $ECHO "Error: Could not remount $SNAPSHOT_RW readonly"; exit; fi;

fi;