emerge-gitclone

#!/usr/bin/python

from __future__ import print_function

import os
import shutil
import subprocess
import sys

import portage

# Find the version of the currently running release.
release = False
with open('/usr/share/coreos/release') as release_file:
	for line in release_file:
		if line.startswith('COREOS_RELEASE_VERSION='):
			release = line.split('=', 1)[1].strip()

# Attempt to read Git commits from this release's manifest.
branch = 'master'
commits = {}
if release:
	branch = 'build-' + release.split('.', 1)[0]
	manifest = "https://raw.githubusercontent.com/coreos/manifest/v%s/release.xml" % release
	try:
		from xml.dom.minidom import parseString as pxs
		try:  # Python 3
			from urllib import request as req
		except ImportError:  # Python 2
			import urllib2 as req
		for repo in pxs(req.urlopen(manifest).read()).getElementsByTagName('project'):
			commits[repo.getAttribute('name')] = repo.getAttribute('revision')
	except Exception:
		print(">>> Failed to read manifest commits for %s" % release)

synced = False
eroot = portage.settings['EROOT']
for repo in portage.db[eroot]['vartree'].settings.repositories:
	if repo.sync_type != 'git':
		continue
	commit = commits.get(repo.sync_uri.replace('//', '').replace('.git', '').split('/', 1)[-1])

	print(">>> Cloning repository '%s' from '%s'..." % (repo.name, repo.sync_uri))

	if os.path.isdir(repo.location):
		shutil.rmtree(repo.location)
	elif os.path.lexists(repo.location):
		os.unlink(repo.location)

	print('>>> Starting git clone in %s' % repo.location)
	os.umask(0o022)
	subprocess.check_call(['git', 'clone', '-b', branch, repo.sync_uri, repo.location])
	print('>>> Git clone in %s successful' % repo.location)
	if commit:
		subprocess.check_call(['git', '-C', repo.location, 'checkout', commit])
		print('>>> Release checkout %s in %s successful' % (commit, repo.location))
	synced = True

if synced:
	# Perform normal post-sync tasks
	configroot = portage.settings['PORTAGE_CONFIGROOT']
	post_sync = '%s/etc/portage/bin/post_sync' % configroot
	if os.path.exists(post_sync):
		subprocess.check_call([post_sync])
	subprocess.check_call(['emerge', '--check-news', '--quiet'])
else:
	sys.stderr.write('>>> No git repositories configured.\n')
	sys.exit(1)