Make snapshotLC sh
#!/bin/bash # ---------------------------------------------------------------------- ## (c) 2007, Pfalzwolf for www.linux-club.de ## Idea: ## Mike Rubel 2004.01.04 ## ## License: ## use this software on your own risk, it works for me but there ## are no guaranties at all ## ---------------------------------------------- ## ## make_snapshot: ## Backup Script based on rsync ## It creates Generation Backups for the levels daily, weekly and montly ## ## Version: ## 0.3 ## ## Synopsis: ## make_snapshot [OPTIONS] ## ## Description: ## This script was adopted from Mike Rubels documentation from ## http://www.mikerubel.org/computers/rsync_snapshots/ ## Based on Mikes handy rotating-filesystem-snapshot utility. ## The basic idea is it makes rotating backup-snapshots of /home whenever called ## A few elements came from ## http://www.heinlein-support.de/web/support/wissen/rsync-backup/ ## An exclude list avoids to backup superflous files. ## ## Changes: ## Instead of hourly, daily and weekly snapshots, daily, weekly and monthly ## snapshots are used. ## Checking the available space on backup media ## Free configurable number of snapshots for every single level ## Everything packed into one script ## ## Options: ## -d make the daily backup plus rotate ## -w make the weekly backup ## -m make the monthly backup ## -h displays a short help text ## ## Changelog: ## -------- ########################################################################
unset PATH # suggestion from H. Milz: avoid accidental use of $PATH
# ------------- System Commands used by this script -------------------- ID=/usr/bin/id; ECHO=/bin/echo; MOUNT=/bin/mount; RM=/bin/rm; MV=/bin/mv; CP=/bin/cp; TOUCH=/bin/touch; RSYNC=/usr/bin/rsync; DF=/bin/df; TAIL=/usr/bin/tail; SED=/bin/sed; SYNC=/bin/sync; LOGGER=/bin/logger; CHMOD=/bin/chmod; MKDIR=/bin/mkdir;
# ======================= CUSTOMIZING SECTION ========================== MOUNT_DEVICE=/dev/sda2; # Your Mount device
MOUNT_RO=false; # For write protection set to true SNAPSHOT_RW=/DASI/TEST; # where to store the backups EXCLUDES=/home/wolf/nobackup/backup_exclude; # Create the backup_exclude file first! CHECK_HDMINFREE=true; # Check free space HDMINFREE=93; # Make a backup up to this percentage DAYS=3; # Number of daily backups -1 WEEKS=2; # Number of weekly backups -1 MONTHS=3; # Number of monthly backups -1
- ======================================================================
- Make sure we're running as root
if (( `$ID -u` != 0 )); then { $ECHO "Sorry, must be root. Exiting..."; exit; } fi
- Check Argument
if [ $# != 1 ] ; then { $ECHO "Error: Wrong number of arguments. \ Vaild is one out of -d, -w, -m, -h" ; exit; } fi
- 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
- 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
- ------------- 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
- *********** 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... $SYNC;;
# And thats it for home.
- *********** Weekly Backup ********************************************
-w | -W)$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 $SNAPSHOT_RW/home/weekly.0 ; fi;;
- *********** Monthly Backup *******************************************
-m | -M)$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;
