#!/bin/bash
#
# Postfixadmin software upgrader.
#

# Config parameters
BASENAME="`basename $0`"
OLD_VERSION="$1"
VERSION="$2"

# Syntax check
if [ -z "$2" ]; then
  echo "usage: $BASENAME <old-version> <new-version>"
  exit 1
fi

# Check installed versions
if [ ! -d "postfixadmin-$OLD_VERSION" ]; then
  echo "error: postfixadmin-$OLD_VERSION is not installed, aborting."
  exit 1
elif [ -d "postfixadmin-$VERSION" ]; then
  echo "error: postfixadmin-$VERSION already installed, aborting."
  exit 1
fi

# Download package
wget -c http://downloads.sourceforge.net/project/postfixadmin/postfixadmin/postfixadmin-$VERSION/postfixadmin-$VERSION.tar.gz

# Download signature
wget -c http://downloads.sourceforge.net/project/postfixadmin/postfixadmin/postfixadmin-$VERSION/postfixadmin-$VERSION.tar.gz.asc

# Check signature
#gpg --verify postfixadmin-$VERSION.tar.gz.asc postfixadmin-$VERSION.tar.gz || exit 1

# Decompress
(
  mkdir tmp
  cd tmp
  tar xvf ../postfixadmin-$VERSION.tar.gz
  mv postfixadmin-$VERSION ../postfixadmin-$VERSION
  cd ..
  rmdir tmp
)

# Remove package
rm postfixadmin-$VERSION.tar.gz
rm postfixadmin-$VERSION.tar.gz.asc

# Sync configuration
chown -R root. postfixadmin-$VERSION
cp postfixadmin-$VERSION/config.inc.php postfixadmin-$VERSION/config.inc.php.dist
cp -a postfixadmin-$OLD_VERSION/config.inc.php postfixadmin-$VERSION/config.inc.php

# Pivot
rm postfixadmin && ln -s postfixadmin-$VERSION postfixadmin

# Audit
echo "Audit:" && \
du -hs postfixadmin-$OLD_VERSION && \
du -hs postfixadmin-$VERSION