#!/bin/bash
#
# Mediawiki upgrader.
#

# Config parameters
BASENAME="`basename $0`"
RELEASES="http://releases.wikimedia.org/mediawiki/"

# Sudo config
if [ "`whoami`" != 'root' ]; then
  sudo="sudo"
fi

# Deploy
function mediawiki_deploy {
  VERSION="$1"
  MAJOR_VERSION="`echo $VERSION | cut -d . --fields=1,2`"
  TARBALL="mediawiki-$VERSION.tar.gz"

  if [ -z "$VERSION" ]; then
    echo "usage: $BASENAME deploy <version>"
    exit 1
  fi

  $sudo wget $RELEASES/$MAJOR_VERSION/$TARBALL || exit 1
  $sudo wget $RELEASES/$MAJOR_VERSION/$TARBALL.sig || exit 1
  gpg --verify $TARBALL.sig $TARBALL
  $sudo tar xvf $TARBALL || exit 1
  $sudo chown -R root. mediawiki-$VERSION || exit 1
  $sudo rm $TARBALL*
  $sudo ln -sf mediawiki-$VERSION mediawiki
}

# Upgrade
function mediawiki_upgrade {
  OLD_VERSION="$1"
  VERSION="$2"

  if [ -z "$VERSION" ]; then
    echo "usage: $BASENAME upgrade <old-version> <new-version>"
    exit 1
  fi

  # Deploy
  mediawiki_deploy $VERSION

  # Copy configuration
  $sudo cp -a mediawiki-$OLD_VERSION/LocalSettings.php mediawiki-$VERSION/

  # Contrib extensions
  if [ -d "mediawiki-$OLD_VERSION/contrib" ]; then
    $sudo cp -a mediawiki-$OLD_VERSION/contrib mediawiki-$VERSION/

    # Symlink extensions
    for extension in mediawiki-$OLD_VERSION/extensions/*; do
      if [ -h "mediawiki-$OLD_VERSION/extensions/$extension" ]; then
        $sudo cp mediawiki-$OLD_VERSION/extensions/$extension mediawiki-$VERSION/extensions/$extension
      fi
    done
  fi

  # Audit
  echo "Audit:"
  du -hs mediawiki-$OLD_VERSION
  du -hs mediawiki-$VERSION
}

# Main
if [ -z "$1" ]; then
  echo "Usage: $BASENAME <deploy|upgrade> [arguments]"
  exit 1
elif [ "$1" == "deploy" ]; then
  shift
  mediawiki_deploy $*
elif [ "$1" == "upgrade" ]; then
  shift
  mediawiki_upgrade $*
else
  echo "No action $1"
  exit 1
fi