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#!/usr/bin/env python
# Copyright 2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

import datetime
import optparse
import os.path
import random
import re
import subprocess
import urllib

from bugz.bugzilla import BugzillaProxy
from portage.package.ebuild.getmaskingstatus import getmaskingstatus
from portage.xml.metadata import MetaDataXML
import portage.versions

from common import login

if __name__ == "__main__":
	parser = optparse.OptionParser()
	parser.add_option("--arch", dest="arch", action="append", help="Gentoo arch to use, e.g. x86, amd64, ... Can be passed multiple times.")
	parser.add_option("--days", dest="days", type=int, default=30, help="Number of days in the tree after stabilization is possible.")
	parser.add_option("--repo", dest="repo", help="Path to portage CVS repository")
	parser.add_option("--category", dest="category", help="Portage category filter (default is all categories)")
	parser.add_option("--exclude", dest="exclude", help="Regular expression for excluded packages.")
	parser.add_option("--file-bugs", dest="file_bugs", action="store_true", default=False, help="File stabilization bugs for detected candidates. Otherwise (default) the candidates are just displayed.")

	(options, args) = parser.parse_args()
	if not options.arch:
		parser.error("--arch option is required")
	if not options.repo:
		parser.error("--repo option is required")
	if args:
		parser.error("unrecognized command-line args")

	url = 'https://bugs.gentoo.org/xmlrpc.cgi'
	print 'You will be prompted for your Gentoo Bugzilla username and password (%s).' % url
	bugzilla = BugzillaProxy(url)
	login(bugzilla)
	
	final_candidates = []
	now = datetime.datetime.now()
	for cp in portage.portdb.cp_all():
		if options.category and not cp.startswith(options.category + "/"):
			continue

		if options.exclude and re.match(options.exclude, cp):
			continue

		best_stable = portage.versions.best(portage.portdb.match(cp))
		if not best_stable:
			continue
		print 'Working on %s...' % cp,
		candidates = []
		for cpv in portage.portdb.cp_list(cp):
			# Only consider higher versions than best stable.
			if portage.versions.pkgcmp(portage.versions.pkgsplit(cpv), portage.versions.pkgsplit(best_stable)) != 1:
				continue

			# Eliminate alpha, beta, pre, rc, and so on packages.
			is_unstable = False
			for suffix in portage.versions.endversion_keys:
				if ("_" + suffix) in portage.versions.pkgsplit(cpv)[1]:
					is_unstable = True
					break
			if is_unstable:
				continue
			
			# Eliminate 'live' packages. Obviously have some false positives,
			# but it'd be much worse to miss something. There are variations
			# like -r9999 or .9999 in the tree.
			if '99' in cpv:
				continue

			# Eliminate hard masked packages among others.
			if getmaskingstatus(cpv) not in [[u'~%s keyword' % arch] for arch in options.arch]:
				continue

			candidates.append(cpv)
		if not candidates:
			print 'no candidates'
			continue

		candidates.sort(key=portage.versions.cpv_sort_key())
		candidates.reverse()

		# Only consider the best version for stabilization.
		# It's usually better tested, and often maintainers refuse
		# to stabilize anything else, e.g. bug #391607.
		best_candidate = candidates[0]

		pv = portage.versions.catsplit(best_candidate)[1]
		with open(os.path.join(options.repo, cp, 'ChangeLog')) as changelog_file:
			regex = '\*%s \((.*)\)' % re.escape(pv)
			match = re.search(regex, changelog_file.read())
			if not match:
				print 'error parsing ChangeLog'
				continue
			changelog_date = datetime.datetime.strptime(match.group(1), '%d %b %Y')
			if now - changelog_date < datetime.timedelta(days=options.days):
				print 'not old enough'
				continue

		keywords = portage.db["/"]["porttree"].dbapi.aux_get(best_candidate, ['KEYWORDS'])[0]
		missing_arch = False
		for arch in options.arch:
			if arch not in keywords:
				missing_arch = True
				break
		if missing_arch:
			print 'not keyworded ~arch'
			continue

		# Do not risk trying to stabilize a package with known bugs.
		params = {}
		params['summary'] = [cp];
		bugs = bugzilla.Bug.search(params)
		if len(bugs['bugs']):
			print 'has bugs'
			continue

		# Protection against filing a stabilization bug twice.
		params['summary'] = [best_candidate]
		bugs = bugzilla.Bug.search(params)
		if len(bugs['bugs']):
			print 'version has closed bugs'
			continue

		cvs_path = os.path.join(options.repo, cp)
		ebuild_name = portage.versions.catsplit(best_candidate)[1] + ".ebuild"
		ebuild_path = os.path.join(cvs_path, ebuild_name)
		manifest_path = os.path.join(cvs_path, 'Manifest')
		try:
			original_contents = open(ebuild_path).read()
			manifest_contents = open(manifest_path).read()
		except IOError, e:
			print e
			continue
		try:
			for arch in options.arch:
				subprocess.check_output(["ekeyword", arch, ebuild_name], cwd=cvs_path)
			subprocess.check_output(["repoman", "manifest"], cwd=cvs_path)
			subprocess.check_output(["repoman", "full"], cwd=cvs_path)
		except subprocess.CalledProcessError:
			print 'repoman error'
			continue
		finally:
			f = open(ebuild_path, "w")
			f.write(original_contents)
			f.close()
			f = open(manifest_path, "w")
			f.write(manifest_contents)
			f.close()

		metadata = MetaDataXML(os.path.join(cvs_path, 'metadata.xml'), '/usr/portage/metadata/herds.xml')
		maintainer_split = metadata.format_maintainer_string().split(' ', 1)
		maintainer = maintainer_split[0]
		if len(maintainer_split) > 1:
			other_maintainers = maintainer_split[1].split(',')
		else:
			other_maintainers = []
		url = 'http://packages.gentoo.org/package/%s?arches=linux' % urllib.quote(cp)

		if options.file_bugs:
			description = ('Is it OK to stabilize =%s ?\n\n' % best_candidate +
				       'If so, please CC arches and add STABLEREQ keyword.\n\n' +
				       'Stabilization of this package has been repoman-checked on the following arches: %s' % ', '.join(options.arch))
			params['product'] = 'Gentoo Linux'
			params['version'] = 'unspecified'
			params['component'] = 'Keywording and Stabilization'
			params['summary'] = 'Please stabilize =%s' % best_candidate
			params['description'] = description
			params['url'] = url
			params['assigned_to'] = maintainer
			params['cc'] = other_maintainers
			params['severity'] = 'enhancement'
			bug_id = bugzilla.Bug.create(params)['id']
			print 'Submitted bug #%d for %s. ;-)' % (bug_id, best_candidate)
		else:
			print (best_candidate, maintainer, other_maintainers)