backup.sh

#!/bin/bash -x

# backup wrapper
EMAIL="[email protected]"
CONFIG=$1
CONFIG_DIR=/mnt/rdiffbackup/configs/
EMAIL_SUBJ="readynas backup: "


# I forget why this is here
#sleep $[$RANDOM%15]m

# try to locate config file that has our params in it
if [ -e $CONFIG_DIR/$CONFIG ]; then
  . $CONFIG_DIR/$CONFIG
else
  echo "no config for $CONFIG" | mail -s "$EMAIL_SUBJ config $CONFIG not found" $EMAIL
fi

# enable/disable backups for temporary one-shot backups
if [ "x$ENABLED" != "x1" ];  then
  exit 0;
fi

# timestamp
STAMP_NOW=`date +%FT%T%z`
TOUCH_NOW=`date +%FT%T`

touch --date="$TOUCH_NOW" $BACKUPS/$BACKUP

# destination backup root directory
BACKUPS=/mnt/rdiffbackup

# the previous backup - we use this to "diff" against
PREVIOUS=`readlink $BACKUPS/$BACKUP`

# log file
LOGFILE=$BACKUPS/logs/$BACKUP.$STAMP_NOW

touch $LOGFILE;

# test connectivity

rsync -l --timeout 1 -q $SHARE >> $LOGFILE

ERROR=$?
if [ "x$ERROR" != "x0" ]; then 
  echo "rsync $BACKUP failed, error code $ERROR" | mail -s "$EMAIL_SUBJ $BACKUP fail" $EMAIL
  exit 0
fi

echo "rsync connectivity test success, starting transfer at $STAMP_NOW" | mail -s "$EMAIL_SUBJ $BACKUP starting" $EMAIL

# we're starting a new backup, so the old "current" backup becomes the "previous" backup for us to diff against.
rm $BACKUPS/$BACKUP-previous
mv $BACKUPS/$BACKUP $BACKUPS/$BACKUP-previous

# create directory for our destination (most current copy)
CURRENT="$BACKUPS/backups/$BACKUP"_"$STAMP_NOW"
mkdir -p $CURRENT

# softlink it for easier rsync handling -- rsync doesn't like colons in filenames, it makes it think it's a remote share
ln -s $CURRENT $BACKUPS/$BACKUP

rsync \
        --partial --progress \
        --itemize-changes \
        --recursive --links \
        --hard-links \
        --perms \
        --times \
        --group \
        --owner \
        --numeric-ids \
        --devices --specials \
        --delete \
        --exclude-from=$BACKUPS/$BACKUP.exclude \
        --sparse \
        --link-dest=$PREVIOUS \
        --log-file=$BACKUPS/logs/$BACKUP.$STAMP_NOW \
        --verbose --compress $SHARE $BACKUPS/$BACKUP
EXITCODE=$?

( echo -e "backup $BACKUP exit $EXITCODE\n\n\nLog file:\n" && cat $LOGFILE ) | mailx -s "$EMAIL_SUBJ $BACKUP finished" $EMAIL
touch --date="$TOUCH_NOW" $BACKUPS/$BACKUP