#!/bin/sh
# simple rsync backup script written by farmal.in 2011-01-21
#
# latest backup is always in $SDIR/domains/$domain/latest folder
# all backups which are older than 7 days would be deleted
# backup.ini file can't contain comments, empty lines and spaces in domain names
#
# example of a GOOD backup.ini:
# mydomain.com user@mydomain.com:/path/to/public_html
#
 
SDIR="/usr/local/backup"
SKEY="$SDIR/.ssh/id_rsa"
SLOG="$SDIR/backup.log"
PID_FILE="$SDIR/backup.pid"
ADMIN_EMAIL="email@domain.com"
 
 
if [ -e $PID_FILE ]; then
        echo "this task is already running or previous run was completed with errors on `hostname`" | mail -s "Some mess with backups on `hostname`..." $ADMIN_EMAIL
        exit
fi
 
touch $PID_FILE
 
# redirecting all output to logfile
exec >> $SLOG 2>&1

# pause/freeze virtual machine
# mount virtual machine's disks in RO
 
# parsing backup.ini file into $domain and $from variables
cat backup.ini | while read domain from ; do
    destination="$SDIR/domains/$domain"
    # downloading a fresh copy in 'latest' directory
    echo -e "`date` *** $domain backup started">>$SLOG
 
    # start counting rsync worktime
    start=$(date +%s)
    rsync --archive --one-file-system --delete -e "ssh -i $SKEY" "$from" "$destination/latest" || (echo -e "Error when rsyncing $domain. \n\n For more information see $SLOG:\n\n `tail $SLOG`" | mail -s "rsync error" $ADMIN_EMAIL & continue)
    finish=$(date +%s)
    echo -e "`date` *** RSYNC worked for $((finish - start)) seconds">>$SLOG
 
    # cloning the fresh copy by hardlinking
    cp --archive --link "$destination/latest" "$destination/`date +%F`"
    # deleting all previous copies which are older than 7 days by creation date, but not 'latest'
    find "$destination" -maxdepth 1 -ctime +7 -type d -path "$destination/????-??-??" -exec rm -r -f {} \;
    echo "`date` *** The size of $domain/latest is now `du -sh $destination/latest | awk '{print $1}'` ">>$SLOG
    echo -e "`date` *** $domain backup ended">>$SLOG
    echo -e "`date` *** Total allocated `du -sh $destination | awk '{print $1}'`">>$SLOG
    echo -e "------------------------------------------------------------------">>$SLOG
done

# unmount virtual machine's disks
# unpause/unfreeze virtual machine
 
rm $PID_FILE