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#!/bin/sh

#
# Copyright (c) 2002, 2003, 2004, 2005 Peter Palfrader <peter@palfrader.org>
#
# All rights reserved.
#
#

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
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