#!/bin/bash
# ----------------------------------------------------------------------
## (c) 2007, Pfalzwolf for www.linux-club.de
##
## Idea:
## Mike Rubel 2004.01.04 (http://www.mikerubel.org/computers/rsync_snapshots/)
##
## License:
## LGPL
##
## Disclaimer:
## Use this software on your own risk, it works for me but there
## are no guaranties at all
## ----------------------------------------------
##
## make_snapshotLC:
## Backup Script based on rsync
## It creates Generation Backups for the levels daily, weekly and montly
##
## Version:
## 0.3
##
## Synopsis:
## make_snapshotLC [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;
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