git.rb
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git.rb
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	require File.join(File.dirname(__FILE__), '..', 'vcsrepo')

	Puppet::Type.type(:vcsrepo).provide(:git, :parent => Puppet::Provider::Vcsrepo) do
	desc "Supports Git repositories"

	##TODO modify the commands below so that the su - is included
	optional_commands :git => 'git',
	:su => 'su'
	defaultfor :git => :exists
	has_features :bare_repositories, :reference_tracking, :ssh_identity, :multiple_remotes, :user

	def create
	if !@resource.value(:source)
	init_repository(@resource.value(:path))
	else
	clone_repository(@resource.value(:source), @resource.value(:path))
	if @resource.value(:revision)
	if @resource.value(:ensure) == :bare
	notice "Ignoring revision for bare repository"
	else
	checkout
	end
	end
	if @resource.value(:ensure) != :bare
	update_submodules
	end
	end
	update_owner_and_excludes
	end

	def destroy
	FileUtils.rm_rf(@resource.value(:path))
	end

	def latest?
	at_path do
	return self.revision == self.latest
	end
	end

	def latest
	branch = on_branch?
	if branch == 'master'
	return get_revision("#{@resource.value(:remote)}/HEAD")
	elsif branch == '(no branch)'
	return get_revision('HEAD')
	else
	return get_revision("#{@resource.value(:remote)}/%s" % branch)
	end
	end

	def revision
	update_references
	current = at_path { git_with_identity('rev-parse', 'HEAD').chomp }
	return current unless @resource.value(:revision)

	if tag_revision?(@resource.value(:revision))
	canonical = at_path { git_with_identity('show', @resource.value(:revision)).scan(/commit (.*)/).to_s }
	else
	canonical = at_path { git_with_identity('rev-parse', @resource.value(:revision)).chomp }
	end

	if current == canonical
	@resource.value(:revision)
	else
	current
	end
	end

	def revision=(desired)
	checkout(desired)
	if local_branch_revision?(desired)
	# reset instead of pull to avoid merge conflicts. assuming remote is
	# authoritative.
	# might be worthwhile to have an allow_local_changes param to decide
	# whether to reset or pull when we're ensuring latest.
	at_path { git_with_identity('reset', '--hard', "#{@resource.value(:remote)}/#{desired}") }
	end
	if @resource.value(:ensure) != :bare
	update_submodules
	end
	update_owner_and_excludes
	end

	def bare_exists?
	bare_git_config_exists? && !working_copy_exists?
	end

	def working_copy_exists?
	File.directory?(File.join(@resource.value(:path), '.git'))
	end

	def exists?
	working_copy_exists? \|\| bare_exists?
	end

	def update_references
	at_path do
	git_with_identity('fetch', @resource.value(:remote))
	git_with_identity('fetch', '--tags', @resource.value(:remote))
	update_owner_and_excludes
	end
	end

	private

	def bare_git_config_exists?
	File.exist?(File.join(@resource.value(:path), 'config'))
	end

	def clone_repository(source, path)
	check_force
	args = ['clone']
	if @resource.value(:ensure) == :bare
	args << '--bare'
	end
	if !File.exist?(File.join(@resource.value(:path), '.git'))
	args.push(source, path)
	git_with_identity(*args)
	else
	notice "Repo has already been cloned"
	end
	end

	def check_force
	if path_exists?
	if @resource.value(:force)
	notice "Removing %s to replace with vcsrepo." % @resource.value(:path)
	destroy
	else
	raise Puppet::Error, "Could not create repository (non-repository at path)"
	end
	end
	end

	def init_repository(path)
	check_force
	if @resource.value(:ensure) == :bare && working_copy_exists?
	convert_working_copy_to_bare
	elsif @resource.value(:ensure) == :present && bare_exists?
	convert_bare_to_working_copy
	else
	# normal init
	FileUtils.mkdir(@resource.value(:path))
	args = ['init']
	if @resource.value(:ensure) == :bare
	args << '--bare'
	end
	at_path do
	git_with_identity(*args)
	end
	end
	end

	# Convert working copy to bare
	#
	# Moves:
	# <path>/.git
	# to:
	# <path>/
	def convert_working_copy_to_bare
	notice "Converting working copy repository to bare repository"
	FileUtils.mv(File.join(@resource.value(:path), '.git'), tempdir)
	FileUtils.rm_rf(@resource.value(:path))
	FileUtils.mv(tempdir, @resource.value(:path))
	end

	# Convert bare to working copy
	#
	# Moves:
	# <path>/
	# to:
	# <path>/.git
	def convert_bare_to_working_copy
	notice "Converting bare repository to working copy repository"
	FileUtils.mv(@resource.value(:path), tempdir)
	FileUtils.mkdir(@resource.value(:path))
	FileUtils.mv(tempdir, File.join(@resource.value(:path), '.git'))
	if commits_in?(File.join(@resource.value(:path), '.git'))
	reset('HEAD')
	git_with_identity('checkout', '-f')
	update_owner_and_excludes
	end
	end

	def commits_in?(dot_git)
	Dir.glob(File.join(dot_git, 'objects/info/*'), File::FNM_DOTMATCH) do \|e\|
	return true unless %w(. ..).include?(File::basename(e))
	end
	false
	end

	def checkout(revision = @resource.value(:revision))
	if !local_branch_revision? && remote_branch_revision?
	at_path { git_with_identity('checkout', '-b', revision, '--track', "#{@resource.value(:remote)}/#{revision}") }
	else
	at_path { git_with_identity('checkout', '--force', revision) }
	end
	end

	def reset(desired)
	at_path do
	git_with_identity('reset', '--hard', desired)
	end
	end

	def update_submodules
	at_path do
	git_with_identity('submodule', 'init')
	git_with_identity('submodule', 'update')
	git_with_identity('submodule', 'foreach', 'git', 'submodule', 'init')
	git_with_identity('submodule', 'foreach', 'git', 'submodule', 'update')
	end
	end

	def remote_branch_revision?(revision = @resource.value(:revision))
	# git < 1.6 returns '#{@resource.value(:remote)}/#{revision}'
	# git 1.6+ returns 'remotes/#{@resource.value(:remote)}/#{revision}'
	branch = at_path { branches.grep /(remotes\/)?#{@resource.value(:remote)}\/#{revision}/ }
	if branch.length > 0
	return branch
	end
	end

	def local_branch_revision?(revision = @resource.value(:revision))
	at_path { branches.include?(revision) }
	end

	def tag_revision?(revision = @resource.value(:revision))
	at_path { tags.include?(revision) }
	end

	def branches
	at_path { git_with_identity('branch', '-a') }.gsub('*', ' ').split(/\n/).map { \|line\| line.strip }
	end

	def on_branch?
	at_path { git_with_identity('branch', '-a') }.split(/\n/).grep(/\/).first.to_s.gsub('', '').strip
	end

	def tags
	at_path { git_with_identity('tag', '-l') }.split(/\n/).map { \|line\| line.strip }
	end

	def set_excludes
	at_path { open('.git/info/exclude', 'w') { \|f\| @resource.value(:excludes).each { \|ex\| f.write(ex + "\n") }}}
	end

	def get_revision(rev)
	if !working_copy_exists?
	create
	end
	at_path do
	git_with_identity('fetch', @resource.value(:remote))
	git_with_identity('fetch', '--tags', @resource.value(:remote))
	end
	current = at_path { git_with_identity('rev-parse', rev).strip }
	if @resource.value(:revision)
	if local_branch_revision?
	canonical = at_path { git_with_identity('rev-parse', @resource.value(:revision)).strip }
	elsif remote_branch_revision?
	canonical = at_path { git_with_identity('rev-parse', "#{@resource.value(:remote)}/" + @resource.value(:revision)).strip }
	end
	current = @resource.value(:revision) if current == canonical
	end
	update_owner_and_excludes
	return current
	end

	def update_owner_and_excludes
	if @resource.value(:owner) or @resource.value(:group)
	set_ownership
	end
	if @resource.value(:excludes)
	set_excludes
	end
	end

	def git_with_identity(*args)
	if @resource.value(:identity)
	Tempfile.open('git-helper') do \|f\|
	f.puts '#!/bin/sh'
	f.puts "exec ssh -oStrictHostKeyChecking=no -oPasswordAuthentication=no -oKbdInteractiveAuthentication=no -oChallengeResponseAuthentication=no -i #{@resource.value(:identity)} $*"
	f.close

	FileUtils.chmod(0755, f.path)
	env_save = ENV['GIT_SSH']
	ENV['GIT_SSH'] = f.path

	ret = git(*args)

	ENV['GIT_SSH'] = env_save

	return ret
	end
	elsif @resource.value(:user)
	su(@resource.value(:user), '-c', "git #{args.join(' ')}" )
	else
	git(*args)
	end
	end
	end

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