#!/usr/bin/env ruby

# Copyright, 2015, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require 'etc'

# Add the following into sudoers for this to work correctly:
# Users in group wheel can execute all commands as user http with no password.
# %wheel ALL=(http) NOPASSWD: ALL

GIT_WORK_TREE = `git config core.worktree`.chomp

# We convert GIT_DIR to an absolute path:
ENV['GIT_DIR'] = File.join(Dir.pwd, ENV['GIT_DIR'])

# We deploy the site as the user and group of the directory for the working tree:
File.stat(GIT_WORK_TREE).tap do |stat|
	ENV['DEPLOY_USER'] = DEPLOY_USER = Etc.getpwuid(stat.uid).name
	ENV['DEPLOY_GROUP'] = DEPLOY_GROUP = Etc.getgrgid(stat.gid).name
end

WHOAMI = `whoami`.chomp!

# We should find out if we need to use sudo or not:
SUDO = if WHOAMI != DEPLOY_USER
	["sudo", "-u", "DEPLOY_USER"]
end

def sh(command)
	puts command.join(' ')
	system(*command) or abort("Deployment failed!")
end

def sudo(command)
	sh([*SUDO, *command])
end

puts "Deploying to #{GIT_WORK_TREE} as #{DEPLOY_USER}:#{DEPLOY_GROUP}..."
Dir.chdir(GIT_WORK_TREE) do
	# Pass on our rights to the files we just uploaded to the deployment user/group:
	sh %W{chmod -Rf ug+rwX .}
	sh %W{chown -Rf #{DEPLOY_USER}:#{DEPLOY_GROUP} .}
	
	sudo %W{git checkout -f}
	sudo %W{git submodule update -i}
	
	if File.exist? 'Gemfile'
		sudo %W{bundle install --deployment --clean --jobs=4 --retry=2 --quiet}
	end
	
	if File.exist? 'Rakefile'
		sudo %W{bundle exec rake deploy}
	end
	
	puts "Restarting server..."
	sudo %W{mkdir -p tmp} unless File.exist?('tmp')
	sudo %W{touch tmp/restart.txt}
end