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#!/bin/bash
#
# Restore a website from backup.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with this program.  If not, see
# <http://www.gnu.org/licenses/>.

# Load.
source $APP_BASE/lib/hydra/functions || exit 1
hydra_config_load

# Basic parameters.
SITE="$2"
SITES="/var/sites"
FOLDER="$SITES/$SITE"
WWW="/var/www/data"

# Syntax check.
if [ -z "$SITE" ]; then
  hydra_action_usage
  exit 1
fi

# Check restore strategy.
if [ "$1" == "backups" ]; then
  SITE="$3"

  if [ -z "$SITE" ]; then
    hydra_action_usage
    exit 1
  fi

  hydra_backup_environment_local_website $2 $SITE
elif [ "$1" == "localhost" ] || [ "$1" == "`facter hostname`" ]; then
  hydra_backup_environment_local
else
  hydra_backup_environment_remote $1 restore
fi

# Set site user.
if hydra_check_user $SITE; then
  SITE_USER="$SITE"
  TRAC_USER="$SITE"
else
  SITE_USER="root"
  TRAC_USER="www-data"
fi

# Set site group.
if hydra_check_group $SITE; then
  SITE_GROUP="$SITE"
  TRAC_GROUP="$SITE"
else
  SITE_GROUP="root"
  TRAC_GROUP="www-data"
fi

# Local backups are stored compressed
if [ "$1" == "localhost" ] || [ "$1" == "backups" ]; then
  if [ -e "$RESTOREDIR/$SITE.tar.bz2" ]; then
    ( cd $RESTOREDIR && tar xvf $SITE.tar.bz2 )
  fi
fi

# Check if folder exist on the backup.
if [ ! -d "$RESTOREDIR/$FOLDER" ]; then
  echo "Folder $FOLDER does not exist at restored backup $RESTOREDIR"
  exit 1
fi

# Check if there's already a site folder and backup it.
if [ -e "$FOLDER" ]; then
  echo "Folder $FOLDER already exists, backing it up first..."
  hydractl backup-site $SITE
  if [ "$?" != "0" ]; then
    echo "Error backing up $FOLDER"
    exit 1
  else
    echo "Erasing old site folder"
    rm -rf $FOLDER
  fi
fi

# Copy site folder from backup
if [ -d "$RESTOREDIR/$FOLDER" ]; then
  echo "Copying site $SITE from backup $RESTOREDIR..."
  cp -a $RESTOREDIR/$FOLDER $FOLDER
fi

# Delete uncompressed local backup
if [ "$1" == "localhost" ] || [ "$1" == "backups" ]; then
  rm -rf $RESTOREDIR/$FOLDER 
fi

# Fix permissions
chown -R root.root $FOLDER

# Trac
if [ -e "$FOLDER/trac" ]; then
  # Optionally also: gvcache/ log/
  ( cd $FOLDER/trac && chown -R $TRAC_USER.$TRAC_GROUP attachments conf db auth plugins .egg-cache )
fi

# PmWiki
if [ -e "$FOLDER/wiki" ]; then
  ( cd $FOLDER/wiki && chown -R $SITE_USER.$SITE_GROUP wiki.d uploads )
  chown $SITE.root $FOLDER/wiki/local/config.php
  chmod 660 $FOLDER/wiki/local/config.php
fi

# Site
if [ -e "$FOLDER/site" ]; then
  chown -R $SITE_USER.$SITE_GROUP $FOLDER/site
fi

# Drupal
if [ -e "$FOLDER/drupal" ]; then
  SERIES="$4"

  chown -R $SITE_USER.$SITE_GROUP $FOLDER/drupal/files
  chown root.$SITE_GROUP $FOLDER/drupal/settings.php
  chmod 640 $FOLDER/drupal/settings.php

  if [ -e "/etc/apache2/sites-available/$SITE" ]; then
    SERVER_ALIAS="`grep ServerAlias /etc/apache2/sites-available/$SITE | sed -e 's/ServerAlias//'`"
  fi

  if [ ! -z "$SERIES" ]; then
    if [ -e "$WWW/drupal-$SERIES/sites" ]; then
      echo "Creating basic drupal symlinks..."
      (
      cd $WWW/drupal-$SERIES/sites
      ln -sf $FOLDER/drupal $SITE
      ln -sf $FOLDER/drupal $SITE.`facter domain`

      for server_alias in $SERVER_ALIAS; do
        if [ ! -e "$server_alias" ]; then
          ln -sf $FOLDER/drupal $server_alias
        fi
      done
      )
    else
      echo "No drupal $SERIES found in the system, so no symlink handling"
    fi
  else
    echo "No drupal series argument provided, so no symlink handling"
  fi
fi

# Restore database
hydractl backup-restore-database $*

# Ikiwiki
if [ -e "$FOLDER/ikiwiki" ]; then
  echo "Restoring ikiwiki for $SITE..."
  file="/etc/ikiwiki/$SITE.setup"
  if [ -e "$file" ] && [ -e "/var/git/repositories/$SITE.git" ]; then
    site="`basename $file .setup`"
    git clone file:///var/git/repositories/$SITE /var/sites/$SITE/ikiwiki_src
    ikiwiki --setup $file --rebuild
    chown -R $SITE_USER.$SITE_GROUP /var/sites/$SITE/ikiwiki*
  else
    echo "Either $file or git repository not found for $SITE ikiwiki instance"
  fi
fi

# Moin
if [ -e "$FOLDER/moin" ]; then
  echo "Restoring moin for $SITE..."
  chown -R root.root $FOLDER/moin/
  chown -R $SITE_USER.$SITE_GROUP $FOLDER/moin/{cgi-bin,data,underlay}
fi