#!/bin/bash
#############################################################################
# Purpose:
#   Deploys the latest code developer code onto the Dev site.
#
# Usage:
#   deploy-drupal-code-dev (typically called as a cron job)
#
# Requirements:
#   1) SSH must have access to an SSH key you've uploaded to the Git server
#      so the code repository can be read.
#   2) Passwordless SSH access (key-based) to the Varnish VM is necessary to
#      clear the Varnish cache.
#   3) Configure the first section as per your project architecture.
#
# IMPORTANT:
#   IF YOU MAKE ANY CHANGES TO THIS FILE, MAKE SURE TO COMMIT THEM TO THE GIT
#   REPOSITORY, OVER AT sites/all/scripts.  This file would
#   normally be a symlink to that from /etc/cron.XXX, but we can't guarantee
#   the necessary permissions in the repository.  See
#   http://askubuntu.com/questions/54857/can-symlinks-be-used-in-etc-cron-d
#   for details.
#############################################################################

## Configuration section START ##############################################

# Set e-mail address to send errors.
MAILTO="someone@example.com"

# Set log file.
LOGFILE="/var/log/deployments/$(date +%FT%T)"
LATEST="/var/log/deployments/latest"

# Set the development branch.
BRANCH=dev

# Set the Drush site alias for Dev.
SITE=@dev

# Set the hostname for the Varnish server.
VARNISH=varnish.example.com

# Set command paths.
DRUSH=/usr/bin/drush
GIT=/usr/bin/git
ECHO=/bin/echo
UMASK=umask
LN=/bin/ln

## Configuration section END ################################################

# Set variables with defaults and arguments.
WEBDIR=$($DRUSH dd $SITE)

# Stop executing the script if any command fails.
# See http://stackoverflow.com/a/4346420/442022 for details.
set -e
set -o pipefail

# Start redirecting output to log file.
{

$ECHO "Setting umask..."
$UMASK 002

$ECHO "Switching to the Web directory..."
cd $WEBDIR

$ECHO "Purging local modifications..."
$GIT reset --hard HEAD

$ECHO "Purging local untracked files..."
$GIT clean -f -d

$ECHO "Switching to the development branch..."
$GIT checkout $BRANCH

$ECHO "Grabbing latest code from the development branch..."
$GIT pull -u origin $BRANCH

$ECHO "Rebuilding the registry in case file locations have changed..."
$DRUSH pm-download registry_rebuild -y
$DRUSH registry-rebuild

$ECHO "Updating the database schema..."
$DRUSH updatedb -y

$ECHO "Reverting all features to those in code..."
# The cache clearing is necessary for https://drupal.org/node/1822278.
$DRUSH cache-clear all
$DRUSH features-revert-all -y

$ECHO "Reverting any views that aren't featurized..."
$DRUSH views-revert --all

$ECHO "Clearing all caches..."
# Drupal.
$DRUSH cache-clear all
# Varnish.
# This will block at a password prompt unless key access has been set up.
ssh $VARNISH varnishadm "ban req.url \~ /"

$ECHO "All done!"

} >& $LOGFILE

# Set a pointer to the latest log file.
$LN -sf $LOGFILE $LATEST