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cached_deploy.rb
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cached_deploy.rb
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# stolen wholesale from capistrano, thanks Jamis!
require 'yaml'
class ChefDeployFailure < StandardError
end
class CachedDeploy
# Executes the SCM command for this strategy and writes the REVISION
# mark file to each host.
def deploy
@configuration[:release_path] = "#{@configuration[:deploy_to]}/releases/#{Time.now.utc.strftime("%Y%m%d%H%M%S")}"
if @configuration[:revision] == ''
@configuration[:revision] = source.query_revision(@configuration[:branch]) {|cmd| run "#{cmd}"}
end
if check_current_revision_and_noop_if_same(@configuration[:revision])
symlink
return
end
Chef::Log.info "deploying branch: #{@configuration[:branch]} rev: #{@configuration[:revision]}"
Chef::Log.info "updating the cached checkout"
chef_run(update_repository_cache)
Chef::Log.info "copying the cached version to #{configuration[:release_path]}"
chef_run(copy_repository_cache)
install_gems
callback(:before_migrate)
migrate
callback(:before_symlink)
symlink
callback(:before_restart)
restart
callback(:after_restart)
cleanup
end
def restart
unless @configuration[:restart_command].empty?
Chef::Log.info "restarting app: #{latest_release}"
chef_run("cd #{current_path} && sudo -u #{user} RAILS_ENV=#{@configuration[:environment]} RACK_ENV=#{@configuration[:environment]} MERB_ENV=#{@configuration[:environment]} #{@configuration[:restart_command]}")
end
end
def check_current_revision_and_noop_if_same(newrev)
IO.read("#{latest_release}/REVISION").chomp == newrev
rescue
false
end
# before_symlink
# before_restart
def callback(what)
if File.exist?("#{latest_release}/deploy/#{what}.rb")
Chef::Log.info "running deploy hook: #{latest_release}/deploy/#{what}.rb"
chef_run("cd #{latest_release} && sudo -u #{user} ruby deploy/#{what}.rb #{@configuration[:environment]} #{@configuration[:role]}")
end
end
def latest_release
all_releases.last
end
def previous_release(current=latest_release)
index = all_releases.index(current)
all_releases[index-1]
end
def oldest_release
all_releases.first
end
def all_releases
`ls #{release_path}`.split("\n").sort.map{|r| File.join(release_path, r)}
end
def cleanup
while all_releases.size >= 5
FileUtils.rm_rf oldest_release
end
end
def rollback
Chef::Log.info "rolling back to previous release"
symlink(previous_release)
FileUtils.rm_rf latest_release
Chef::Log.info "restarting with previous release"
restart
end
def migrate
if @configuration[:migrate]
chef_run "ln -nfs #{shared_path}/config/database.yml #{latest_release}/config/database.yml"
Chef::Log.info "Migrating: cd #{latest_release} && sudo -u #{user} RAILS_ENV=#{@configuration[:environment]} RACK_ENV=#{@configuration[:environment]} MERB_ENV=#{@configuration[:environment]} #{@configuration[:migration_command]}"
chef_run("chown -R #{user}:#{user} #{latest_release}")
chef_run("cd #{latest_release} && sudo -u #{user} RAILS_ENV=#{@configuration[:environment]} RACK_ENV=#{@configuration[:environment]} MERB_ENV=#{@configuration[:environment]} #{@configuration[:migration_command]}")
end
end
def user
@configuration[:user] || 'nobody'
end
def current_path
"#{@configuration[:deploy_to]}/current"
end
def shared_path
configuration[:shared_path]
end
def release_path
"#{@configuration[:deploy_to]}/releases"
end
def symlink(release_to_link=latest_release)
Chef::Log.info "symlinking and finishing deploy"
symlink = false
begin
chef_run [ "chmod -R g+w #{release_to_link}",
"rm -rf #{release_to_link}/log #{release_to_link}/public/system #{release_to_link}/tmp/pids",
"mkdir -p #{release_to_link}/tmp",
"ln -nfs #{shared_path}/log #{release_to_link}/log",
"mkdir -p #{release_to_link}/public",
"mkdir -p #{release_to_link}/config",
"ln -nfs #{shared_path}/system #{release_to_link}/public/system",
"ln -nfs #{shared_path}/pids #{release_to_link}/tmp/pids",
"ln -nfs #{shared_path}/config/database.yml #{release_to_link}/config/database.yml",
"chown -R #{user}:#{user} #{release_to_link}"
].join(" && ")
symlink = true
chef_run "rm -f #{current_path} && ln -nfs #{release_to_link} #{current_path} && chown -R #{user}:#{user} #{current_path}"
rescue => e
chef_run "rm -f #{current_path} && ln -nfs #{previous_release(release_to_link)} #{current_path} && chown -R #{user}:#{user} #{current_path}" if symlink
chef_run "rm -rf #{release_to_link}"
raise e
end
end
def run(cmd)
res = `#{cmd} 2>&1`
raise(ChefDeployFailure, res) unless $? == 0
res
end
def chef_run(cmd)
Chef::Mixin::Command.run_command(:command => cmd)
end
# :repository_cache
# :shared_path
# :repository
# :release_path
# :copy_exclude
# :revision
# :user
# :group
def initialize(opts={})
@configuration = opts
@configuration[:shared_path] = "#{@configuration[:deploy_to]}/shared"
end
def configuration
@configuration
end
def source
@source ||= Git.new(configuration)
end
private
def install_gems
if File.exist?("#{latest_release}/gems.yml")
gems = YAML.load(IO.read("#{latest_release}/gems.yml"))
resources = []
gems.each do |g|
next if has_gem?(g[:name], g[:version])
r = Chef::Resource::GemPackage.new(g[:name], nil, @configuration[:node])
r.version g[:version]
r.source "http://gems.github.com"
resources << r
end
resources.each do |r|
begin
r.run_action(:install)
rescue Chef::Exception::Exec => e
Chef::Log.info("Error installing gem: #{r.package_name} version: #{r.version}")
raise e
end
end
end
end
def has_gem?(name, version=nil)
if !$GEM_LIST_DEPLOY
gems = {}
`gem list --local`.each_line do |line|
gems[$1.to_sym] = $2.split(/, /) if line =~ /^(.*) \(([^\)]*)\)$/
end
$GEM_LIST_DEPLOY = gems
end
if $GEM_LIST_DEPLOY[name.to_sym]
if version
if $GEM_LIST_DEPLOY[name.to_sym].include?(version)
Chef::Log.info("Gem: #{name}:#{version} already installed, skipping")
return true
end
else
Chef::Log.info("Gem: #{name} already installed, skipping")
return true
end
end
false
end
def repository_cache
File.join(configuration[:shared_path], configuration[:repository_cache] || "cached-copy")
end
def update_repository_cache
command = "if [ -d #{repository_cache} ]; then " +
"sudo -u #{user} #{source.sync(revision, repository_cache)}; " +
"else sudo -u #{user} #{source.checkout(revision, repository_cache)}; fi"
command
end
def copy_repository_cache
if copy_exclude.empty?
return "cp -RPp #{repository_cache} #{configuration[:release_path]} && #{mark}"
else
exclusions = copy_exclude.map { |e| "--exclude=\"#{e}\"" }.join(' ')
return "rsync -lrpt #{exclusions} #{repository_cache}/* #{configuration[:release_path]} && #{mark}"
end
end
def revision
configuration[:revision]
end
def mark
"(echo #{revision} > #{configuration[:release_path]}/REVISION)"
end
def copy_exclude
@copy_exclude ||= Array(configuration.fetch(:copy_exclude, []))
end
end