#!/bin/bash
#
-# wizbackup 2.0 - Simple rsync backup
+# WizBackup 2.0 - Simple rsync backup
# Based on incremental-backup 0.1 by Matteo Mattei
#
# Copyright 2006 Matteo Mattei <matteo.mattei@gmail.com>
# Copyright 2007, 2008, 2009, 2010, 2011 Bernie Innocenti <bernie@codewiz.org>
#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License,
-# or (at your option) any later version.
-
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License,
+# or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
-if [ $# -lt 2 ]
-then
+if [ $# -lt 2 ]; then
echo "Usage: $0 SOURCE DEST [RSYNC_OPTS]"
exit 1
fi
-# Fail on any error; Treat undefined variables as errors
-set -e -u
+# Treat undefined variables as errors
+set -u
#####################################################################
# CONFIGURATION
#####################################################################
-# Source path
+# Source rsync URL
SRC=$1; shift
-# DESTINATION DIRECTORY (must exists)
+# Destination directory (will be created if it doesn't exist)
DEST=$1; shift
# NOTE: --timeout needs to be large enough: if a large dir tree don't change a lot of time can pass without I/O
# NOTE: --inplace will clobber linked files in older snapshots. DON'T USE IT!
-RSYNC_OPTIONS="-HAXa --stats --timeout 1800 --numeric-ids --delete --delete-excluded --ignore-errors $@"
-# NUMBER OF SAVED ARCHIVES
-N_SNAPSHOT=45
-RESULT=500
+RSYNC_OPTS="-HAXa --stats --timeout 1800 --numeric-ids --delete --delete-excluded --ignore-errors $@"
+# Number of saved snapshots
+SNAPSHOTS=45
+
+# Abort backup if the destination volume has less than these GBs free
+MIN_FREE_GB=10
+
+RESULT=500
DATE=`date +"%Y%m%d"`
DEST="`echo $DEST | sed -e 's/\/$//'`"
# Use "backup" ssh key with ssh protocol, or password file for rsync protocol
if [ "${SRC%:*}" == "rsync" ]; then
- RSYNC_PWD="--password-file=/etc/wizbackup.pwd --contimeout 10"
+ RSYNC_OPTS="$RSYNC_OPTS --password-file=/etc/wizbackup/rsync_password --contimeout 10"
else
- export RSYNC_RSH="ssh -i /root/.ssh/id_backup -c arcfour -x -o VerifyHostKeyDNS=yes"
- RSYNC_PWD=""
+ export RSYNC_RSH="ssh -i /etc/wizbackup/ssh_id -c arcfour -x -o VerifyHostKeyDNS=yes -o StrictHostKeyChecking=no"
fi
# Error tolerant grep
do_backup()
{
set -o pipefail
- echo "$(date): Starting rsync: rsync $RSYNC_PWD $RSYNC_OPTIONS $SRC $DEST/$DATE/"
- rsync $RSYNC_PWD $RSYNC_OPTIONS "$SRC" "$DEST/tmp/" 2>&1 | tgrep -v -E 'vanished|some files'
+ echo "$(date): rsync $RSYNC_OPTS $SRC $DEST/tmp/"
+ rsync $RSYNC_OPTS "$SRC" "$DEST/tmp/" 2>&1 | tgrep -v -E 'vanished|some files'
RESULT=$?
case "$RESULT" in
0|24)
set +o pipefail
}
-do_link()
+
+do_init()
{
# Safety net (4 slashes just in case)
case "$DEST" in
mkdir -p "$DEST" || exit 667
fi
- pushd "$DEST" >/dev/null || exit 668
+ cd "$DEST" || exit 668
+}
- # Remove old backups
- local old="`ls | head -n -$N_SNAPSHOT`"
+do_prune()
+{
+ local old="`ls | grep -v tmp | head -n -$SNAPSHOTS`"
if [ ! -z "$old" ]; then
echo "$(date): Removing oldest snapshot(s): $old..."
rm -rf "$old" || exit 669
fi
+}
- local newest=`ls | tail -n 1`
- if [ -z "$newest" ]; then
+do_link()
+{
+ local newest=`ls | grep -v tmp | tail -n 1`
+ if [ -d "$DEST/tmp" ]; then
+ echo "$(date): Continuing with pre-existing snapshot $DEST/tmp"
+ elif [ -z "$newest" ]; then
echo "$(date): No previous snapshot found, performing a full backup!"
- elif [ -d "$DEST/tmp" ]; then
- echo "$(date): Continuing with preexisting snapshot $DEST/tmp"
else
echo "$(date): Linking snapshot $DEST/$newest to $DEST/tmp"
# TODO: Creating the hardlinks takes a lot of time.
# Perhaps we could save time by recycling the oldest snapshot
- cp -lR "$DEST/$newest" "$DEST/tmp" || exit 670
+ cp -la "$DEST/$newest" "$DEST/tmp"
+ RESULT=$?
+ if [ $RESULT -ne 0 ]; then
+ echo "$(date): Failed to setup tmp snapshot: $RESULT. Cleaning up."
+ rm -rf "$DEST/tmp"
+ exit $RESULT
+ fi
fi
-
- popd >/dev/null
}
do_test()
{
+ # TODO: test for free space and free inodes in the $DEST filesystem
+ block_size=`stat --file-system --format "%S" "$DEST"`
+ free_blocks=`stat --file-system --format "%f" "$DEST"`
+ free_inodes=`stat --file-system --format "%d" "$DEST"`
+ free_gb=$((block_size * free_blocks / 1024 / 1024 / 1024))
+
+ if [ "$free_gb" -lt "$MIN_FREE_GB" ]; then
+ echo "$(date): Aborting due to insufficient free space ${free_gb}GB."
+ exit 670
+ fi
+
# Avoid clobbering the latest snapshot if the remote host does
# not allow us to connect
# --contimeout: sometimes hangs on connection...
- rsync $RSYNC_PWD $RSYNC_OPTIONS --dry-run --no-recursive "$SRC" >/dev/null
+ rsync $RSYNC_OPTS --dry-run --no-recursive "$SRC" >/dev/null
RESULT=$?
if [ $RESULT -ne 0 ]; then
echo "$(date): rsync test failed: $RESULT. Aborting."
fi
}
-######################
-# MAIN
-######################
+######################################
+# Main
+######################################
# make sure to be root
if (( `id -u` != 0 )); then { echo "Sorry, must be root. Exiting..."; exit; } fi
echo "$(date): START backup: $SRC -> $DEST"
+do_init
+do_prune
do_test
do_link
do_backup
projects / wizbackup.git / blobdiff