Samba4 Backup Script for Ubuntu package installations.

ubuntu_samba_backup.sh

#!/bin/bash
#
# Copyright (C) Matthieu Patou <[email protected]> 2010-2011
# Copyright (C) Preston Kutzner <[email protected]> 2018
#
# 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
# MERCHANTIBILITY 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 <https://www.gnu.org/licenses/>.
#
# Revised 2013-09-25, Brian Martin, as follows:
#    - Allow retention period ("DAYS") to be specified as a parameter.
#    - Allow individual positional parameters to be left at the default
#      by specifying "-"
#    - Use ISO 8601 standard dates (yyyy-mm-dd instead of mmddyyyy).
#    - Display tar exit codes when reporting errors.
#    - Don't send error messages to /dev/null, so we know what failed.
#    - Suppress useless tar "socket ignored" message.
#    - Fix retention period bug when deleting old backups ($DAYS variable
#      could be set, but was ignored).
#
# Revised 2018-02-06, Preston Kutzner, as follows:
#    - Modify to backup Ubuntu packaged version of Samba4.
#    - Convert DIRS variable from string to array.
#    - Remove ability to specify FROMWHERE base directory, since
#      Ubuntu spreads some files out. These paths are now
#      specified in the DIRS array and checked for sanity within
#      the main 'for' loop.
#    - Add debug (dry-run) option.
#    - Fix error where 'else' section of main 'if' didn't prepend
#      samba4_ to the beginning of the tarball filename.
#    - Now requires bash, due to double-bracket test for 'DEBUG'
#      and use of bash parameter expansions.

DEBUG="false"
WHERE=/usr/local/backups
DAYS=90

if [[ "$DEBUG" =~ ^[Tt]rue ]]; then
    echo "Debug enabled"
    ECHO="/bin/echo"
fi

if [ -n "$1" ] && [ "$1" = "-h" -o "$1" = "--usage" ]; then
    echo "samba_backup [destinationdir] [retpd]"
    echo "Will backup your provision located in provisiondir to archive stored"
    echo "in destinationdir for retpd days. Use - to leave an option unchanged."
    echo "Default destinationdir: $WHERE"
    echo "Default retpd: $DAYS"
    exit 0
fi

[ -n "$1" -a "$1" != "-" ]&&WHERE=$1            # Use parm or default if "-". Validate later.
[ -n "$2" -a "$2" -eq "$2" 2> /dev/null ]&&DAYS=$2  # Use parm or default if non-numeric (incl "-").

# Number of days to keep the backup
WHEN=`date +%Y-%m-%d`       # ISO 8601 standard date.
DIRS=('/var/lib/samba/private' '/var/lib/samba/sysvol' '/etc/samba')

if [ ! -d $WHERE ]; then
    echo "Missing backup directory $WHERE"
    exit 1
fi

for d in ${DIRS[@]}; do
    # Sanity check.
    if [ ! -d "$d" ]; then
        echo "Missing or wrong provision directory $d"
        exit 1
    fi

    ### Bash parameter expansion explanations ###
    #
    # ${d%/*} Returns path up to, but not including last leaf
    #         e.g. /var/lib/samba/private would be returned as
    #              /var/lib/samba
    # ${d##*/} Returns last leaf only.
    #          e.g. /var/lib/samba/private would be returned as
    #               private
    # ${d#/*} Returns path minus leading '/'
    #         e.g. /var/lib/samba/private would be returned as
    #              var/lib/samba/private
    cd "${d%/*}"
    relativedirname=`find . -type d -name "${d##*/}" -prune`
    n=`echo ${d#/*} | sed 's/\//_/g'`
    if [ "${d##*/}" = "private" ]; then
        find $relativedirname -name "*.ldb.bak" -exec $ECHO rm {} \;
        for ldb in `find $relativedirname -name "*.ldb"`; do
            $ECHO tdbbackup $ldb
            Status=$?
            if [ $Status -ne 0 ]; then
                echo "Error while backing up $ldb - status $Status"
                exit 1
            fi
        done
        # Run the backup
        #   --warning=no-file-ignored set to suppress "socket ignored" messages.
        $ECHO tar cjf ${WHERE}/samba4_${n}.${WHEN}.tar.bz2 $relativedirname --exclude=\*.ldb --warning=no-file-ignored --transform 's/.ldb.bak$/.ldb/'
        Status=$?
        if [ $Status -ne 0 -a $Status -ne 1 ]; then
            echo "Error while archiving ${WHERE}/samba4_${n}.${WHEN}.tar.bz2 - status = $Status"
            exit 1
        fi
        find $relativedirname -name "*.ldb.bak" -exec $ECHO rm {} \;
    else
        # Run the backup.
        #   --warning=no-file-ignored set to suppress "socket ignored" messages.
        $ECHO tar cjf ${WHERE}/samba4_${n}.${WHEN}.tar.bz2 $relativedirname --warning=no-file-ignored
        Status=$?
        if [ $Status -ne 0 ]; then
            echo "Error while archiving ${WHERE}/samba4_${n}.${WHEN}.tar.bz2 - status = $Status"
            exit 1
        fi
    fi
done

$ECHO find ${WHERE} -name "samba4_*bz2" -mtime +$DAYS -exec rm {} \;