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#!/usr/bin/env python3
# Copyright 2017 The Glslang Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Get source files for Glslang and its dependencies from public repositories.
"""
import argparse
import json
import os
import subprocess
import sys
KNOWN_GOOD_FILE = 'known_good.json'
SITE_TO_KNOWN_GOOD_FILE = { 'github' : 'known_good.json',
'gitlab' : 'known_good_khr.json' }
# Maps a site name to its hostname.
SITE_TO_HOST = { 'github' : 'https://github.com/',
'gitlab' : 'git@gitlab.khronos.org:' }
VERBOSE = True
def command_output(cmd, directory, fail_ok=False):
"""Runs a command in a directory and returns its standard output stream.
Captures the standard error stream.
Raises a RuntimeError if the command fails to launch or otherwise fails.
"""
if VERBOSE:
print('In {d}: {cmd}'.format(d=directory, cmd=cmd))
p = subprocess.Popen(cmd,
cwd=directory,
stdout=subprocess.PIPE)
(stdout, _) = p.communicate()
if p.returncode != 0 and not fail_ok:
raise RuntimeError('Failed to run {} in {}'.format(cmd, directory))
if VERBOSE:
print(stdout)
return stdout
def command_retval(cmd, directory):
"""Runs a command in a directory and returns its return value.
Captures the standard error stream.
"""
p = subprocess.Popen(cmd,
cwd=directory,
stdout=subprocess.PIPE)
p.communicate()
return p.returncode
class GoodCommit(object):
"""Represents a good commit for a repository."""
def __init__(self, json):
"""Initializes this good commit object.
Args:
'json': A fully populated JSON object describing the commit.
"""
self._json = json
self.name = json['name']
self.site = json['site']
self.subrepo = json['subrepo']
self.subdir = json['subdir'] if ('subdir' in json) else '.'
self.commit = json['commit']
def GetUrl(self):
"""Returns the URL for the repository."""
host = SITE_TO_HOST[self.site]
return '{host}{subrepo}'.format(
host=host,
subrepo=self.subrepo)
def AddRemote(self):
"""Add the remote 'known-good' if it does not exist."""
remotes = command_output(['git', 'remote'], self.subdir).splitlines()
if b'known-good' not in remotes:
command_output(['git', 'remote', 'add', 'known-good', self.GetUrl()], self.subdir)
def HasCommit(self):
"""Check if the repository contains the known-good commit."""
return 0 == subprocess.call(['git', 'rev-parse', '--verify', '--quiet',
self.commit + "^{commit}"],
cwd=self.subdir)
def Clone(self):
os.makedirs(self.subdir, exist_ok=True)
command_output(['git', 'clone', self.GetUrl(), '.'], self.subdir)
def Fetch(self):
command_output(['git', 'fetch', 'known-good'], self.subdir)
def Checkout(self):
if not os.path.exists(os.path.join(self.subdir,'.git')):
self.Clone()
self.AddRemote()
if not self.HasCommit():
self.Fetch()
command_output(['git', 'checkout', self.commit], self.subdir)
def GetGoodCommits(site):
"""Returns the latest list of GoodCommit objects."""
known_good_file = SITE_TO_KNOWN_GOOD_FILE[site]
with open(known_good_file) as known_good:
return [GoodCommit(c) for c in json.loads(known_good.read())['commits']]
def main():
parser = argparse.ArgumentParser(description='Get Glslang source dependencies at a known-good commit')
parser.add_argument('--dir', dest='dir', default='.',
help="Set target directory for Glslang source root. Default is \'.\'.")
parser.add_argument('--site', dest='site', default='github',
help="Set git server site. Default is github.")
args = parser.parse_args()
commits = GetGoodCommits(args.site)
os.makedirs(args.dir, exist_ok=True)
print('Change directory to {d}'.format(d=args.dir))
os.chdir(args.dir)
# Create the subdirectories in sorted order so that parent git repositories
# are created first.
for c in sorted(commits, key=lambda x: x.subdir):
print('Get {n}\n'.format(n=c.name))
c.Checkout()
sys.exit(0)
if __name__ == '__main__':
main()
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