#!/bin/sh
#
# koha-dump: dump all contents and configs for a Koha site
# Copyright 2010  Catalyst IT, Ltd
# 
# 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/>.


set -e

# include helper functions
if [ -f "/usr/share/koha/bin/koha-functions.sh" ]; then
    . "/usr/share/koha/bin/koha-functions.sh"
else
    echo "Error: /usr/share/koha/bin/koha-functions.sh not present." 1>&2
    exit 1
fi

# Make sure the files we create are not accessible by anyone else.
umask 0077

usage()
{
    local scriptname=$(basename $0)

    cat <<EOF
$scriptname

This script dumps your Koha instance data for backup or migration.

Usage:
$scriptname [--quiet|-q] [--include-indexes|-i] instancename1 [instancename2...]
$scriptname -h|--help

    --exclude-indexes     Include Zebra indexes on the backup.
    --quiet|-q            Make the script avoid printing to STDOUT
                          (useful for calling from another scripts).
    --help|-h             Display this help message

EOF
}

dump_instance()
{
    local name=$1

    kohaconfig="/etc/koha/sites/$name/koha-conf.xml"
    date="$(date +%Y-%m-%d)"

    [ "$quiet" = "no" ] && echo "Dumping Koha site $name:"

    # Dump database.
    mysqlhost="$( xmlstarlet sel -t -v 'yazgfs/config/hostname' $kohaconfig )"
    mysqldb="$( xmlstarlet sel -t -v 'yazgfs/config/database' $kohaconfig )"
    mysqluser="$( xmlstarlet sel -t -v 'yazgfs/config/user' $kohaconfig )"
    mysqlpass="$( xmlstarlet sel -t -v 'yazgfs/config/pass' $kohaconfig )"
    backupdir="$( xmlstarlet sel -t -v 'yazgfs/config/backupdir' $kohaconfig || true )"
    [ -z "$backupdir" ] && backupdir="/var/spool/koha/$name"
    dbdump="$backupdir/$name-$date.sql.gz"
    [ "$quiet" = "no" ] && echo "* DB to $dbdump"
    mysqldump --databases --host="$mysqlhost" \
        --user="$mysqluser" --password="$mysqlpass" "$mysqldb" |
        gzip > "$dbdump"
    chown "root:$name-koha" "$dbdump"
    chmod g+r "$dbdump"

    instancefile="$name.conf"

    # Dump configs, logs, etc.
    metadump="$backupdir/$name-$date.tar.gz"
    [ "$quiet" = "no" ] && echo "* configs, logs to $metadump"

    if [ "$exclude_indexes" = "yes" ]; then
        excludes="--exclude=var/lib/koha/$name/biblios \
                  --exclude=var/lib/koha/$name/authorities"
    fi

    tar -czf "$metadump" -C / $excludes \
        "etc/koha/sites/$name" \
        "etc/apache2/sites-available/$instancefile" \
        "etc/apache2/sites-enabled/$instancefile" \
        "var/lib/koha/$name" \
        "var/log/koha/$name"

    [ "$quiet" = "no" ] && echo "Done."
}

# Default values
quiet="no"
exclude_indexes="no"

while [ $# -gt 0 ]; do

    case "$1" in
        --exclude-indexes)
            exclude_indexes="yes"
            shift ;;
        -h|--help)
            usage ; exit 0 ;;
        -q|--quiet)
            quiet="yes"
            shift ;;
        -*)
            die "Error: invalid option switch ($1)" ;;
        *)
            # We expect the remaining stuff are the instance names
            break ;;
    esac

done

# Read instance names
if [ $# -gt 0 ]; then
    # We have at least one instance name
    for name in "$@"; do

        if is_instance $name; then

            dump_instance $name

        else
            if [ "$quiet" = "no" ]; then
                die "Error: Invalid instance name $name"
            else
                exit 1
            fi
        fi

    done
else
    if [ "$quiet" = "no" ]; then
        die "Error: you must provide at least one instance name"
    else
        exit 1
    fi
fi

exit 0