#!/bin/sh

# Copyright (c) 2002, 2003, 2004, 2005 Peter Palfrader <peter@palfrader.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

umask 037

set -e
set -u

DATE=`date "+%Y%m%d-%H%M%S"`

#PORT="-p 5433"
if [ -z "${PORT:-}" ]; then
	PORT=""
else
	PORT="-p $PORT"
fi
if [ -z "${PREFIX:-}" ]; then
	PREFIX=""
else
	PREFIX="$PREFIX-"
fi

if [ -d /var/backups/local/pg ]; then
	BASE=/var/backups/local/pg
elif [ -d /var/local/backup/pg ]; then
	BASE=/var/local/backup/pg
elif [ -d /aux/dbbackup/pg ]; then
	BASE=/aux/dbbackup/pg
elif [ -d /srv/dbbackup/pg ]; then
	BASE=/srv/dbbackup/pg
else
	echo "Cannot find a backup target directory" >&2
	exit 1
fi

sudo -u postgres psql $PORT -l -t | awk '$1 != "" {print $1}' |
while read db; do
	if [ "$db" = "template0" -o "$db" = "template1" ] ; then
		continue;
	fi

	file="$BASE/$DATE-$PREFIX$db.plain"
	sudo -u postgres pg_dump $PORT --create --format=p "$db" > "$file"
	nice bzip2 -- "$file"

	md5=`md5sum -- "$file.bz2" | awk '{print $1}'`
	if [ -e "$BASE/MD5-$md5" ]; then
		rm -- "$file.bz2"
		ln "$BASE/MD5-$md5" "$file.bz2"
	else
		ln "$file.bz2" "$BASE/MD5-$md5"
	fi
done