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dl_github_archive.py
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executable file
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#!/usr/bin/env python3
#
# Copyright (c) 2018 Yousong Zhou <yszhou4tech@gmail.com>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
import argparse
import calendar
import datetime
import errno
import fcntl
import hashlib
import json
import os
import os.path
import re
import shutil
import ssl
import subprocess
import sys
import time
import urllib.request
TMPDIR = os.environ.get('TMP_DIR') or '/tmp'
TMPDIR_DL = os.path.join(TMPDIR, 'dl')
class PathException(Exception): pass
class DownloadGitHubError(Exception): pass
class Path(object):
"""Context class for preparing and cleaning up directories.
If ```preclean` is ``False``, ``path`` will NOT be removed on context enter
If ``path`` ``isdir``, then it will be created on context enter.
If ``keep`` is True, then ``path`` will NOT be removed on context exit
"""
def __init__(self, path, isdir=True, preclean=False, keep=False):
self.path = path
self.isdir = isdir
self.preclean = preclean
self.keep = keep
def __enter__(self):
if self.preclean:
self.rm_all(self.path)
if self.isdir:
self.mkdir_all(self.path)
return self
def __exit__(self, exc_type, exc_value, traceback):
if not self.keep:
self.rm_all(self.path)
@staticmethod
def mkdir_all(path):
"""Same as mkdir -p."""
names = os.path.split(path)
p = ''
for name in names:
p = os.path.join(p, name)
Path._mkdir(p)
@staticmethod
def _rmdir_dir(dir_):
names = Path._listdir(dir_)
for name in names:
p = os.path.join(dir_, name)
Path.rm_all(p)
Path._rmdir(dir_)
@staticmethod
def _mkdir(path):
Path._os_func(os.mkdir, path, errno.EEXIST)
@staticmethod
def _rmdir(path):
Path._os_func(os.rmdir, path, errno.ENOENT)
@staticmethod
def _remove(path):
Path._os_func(os.remove, path, errno.ENOENT)
@staticmethod
def _listdir(path):
return Path._os_func(os.listdir, path, errno.ENOENT, default=[])
@staticmethod
def _os_func(func, path, errno, default=None):
"""Call func(path) in an idempotent way.
On exception ``ex``, if the type is OSError and ``ex.errno == errno``,
return ``default``, otherwise, re-raise
"""
try:
return func(path)
except OSError as e:
if e.errno == errno:
return default
else:
raise
@staticmethod
def rm_all(path):
"""Same as rm -r."""
if os.path.islink(path):
Path._remove(path)
elif os.path.isdir(path):
Path._rmdir_dir(path)
else:
Path._remove(path)
@staticmethod
def untar(path, into=None):
"""Extract tarball at ``path`` into subdir ``into``.
return subdir name if and only if there exists one, otherwise raise PathException
"""
args = ('tar', '-C', into, '-xzf', path, '--no-same-permissions')
subprocess.check_call(args, preexec_fn=lambda: os.umask(0o22))
dirs = os.listdir(into)
if len(dirs) == 1:
return dirs[0]
else:
raise PathException('untar %s: expecting a single subdir, got %s' % (path, dirs))
@staticmethod
def tar(path, subdir, into=None, ts=None):
"""Pack ``path`` into tarball ``into``."""
# --sort=name requires a recent build of GNU tar
args = ['tar', '--numeric-owner', '--owner=0', '--group=0', '--sort=name']
args += ['-C', path, '-cf', into, subdir]
envs = os.environ.copy()
if ts is not None:
args.append('--mtime=@%d' % ts)
if into.endswith('.xz'):
envs['XZ_OPT'] = '-7e'
args.append('-J')
elif into.endswith('.bz2'):
args.append('-j')
elif into.endswith('.gz'):
args.append('-z')
envs['GZIP'] = '-n'
else:
raise PathException('unknown compression type %s' % into)
subprocess.check_call(args, env=envs)
class GitHubCommitTsCache(object):
__cachef = 'github.commit.ts.cache'
__cachen = 2048
def __init__(self):
Path.mkdir_all(TMPDIR_DL)
self.cachef = os.path.join(TMPDIR_DL, self.__cachef)
self.cache = {}
def get(self, k):
"""Get timestamp with key ``k``."""
fileno = os.open(self.cachef, os.O_RDONLY | os.O_CREAT)
with os.fdopen(fileno) as fin:
try:
fcntl.lockf(fileno, fcntl.LOCK_SH)
self._cache_init(fin)
if k in self.cache:
ts = self.cache[k][0]
return ts
finally:
fcntl.lockf(fileno, fcntl.LOCK_UN)
return None
def set(self, k, v):
"""Update timestamp with ``k``."""
fileno = os.open(self.cachef, os.O_RDWR | os.O_CREAT)
with os.fdopen(fileno, 'w+') as f:
try:
fcntl.lockf(fileno, fcntl.LOCK_EX)
self._cache_init(f)
self.cache[k] = (v, int(time.time()))
self._cache_flush(f)
finally:
fcntl.lockf(fileno, fcntl.LOCK_UN)
def _cache_init(self, fin):
for line in fin:
k, ts, updated = line.split()
ts = int(ts)
updated = int(updated)
self.cache[k] = (ts, updated)
def _cache_flush(self, fout):
cache = sorted(self.cache.items(), key=lambda a: a[1][1])
cache = cache[:self.__cachen]
self.cache = {}
os.ftruncate(fout.fileno(), 0)
fout.seek(0, os.SEEK_SET)
for k, ent in cache:
ts = ent[0]
updated = ent[1]
line = '{0} {1} {2}\n'.format(k, ts, updated)
fout.write(line)
class DownloadGitHubTarball(object):
"""Download and repack archive tarball from GitHub.
Compared with the method of packing after cloning the whole repo, this
method is more friendly to users with fragile internet connection.
However, there are limitations with this method
- GitHub imposes a 60 reqs/hour limit for unauthenticated API access.
This affects fetching commit date for reproducible tarballs. Download
through the archive link is not affected.
- GitHub archives do not contain source codes for submodules.
- GitHub archives seem to respect .gitattributes and ignore paths with
export-ignore attributes.
For the first two issues, the method will fail loudly to allow fallback to
clone-then-pack method.
As for the 3rd issue, to make sure that this method only produces identical
tarballs as the fallback method, we require the expected hash value to be
supplied. That means the first tarball will need to be prepared by the
clone-then-pack method
"""
__repo_url_regex = re.compile(r'^(?:https|git)://github.com/(?P<owner>[^/]+)/(?P<repo>[^/]+)')
def __init__(self, args):
self.dl_dir = args.dl_dir
self.version = args.version
self.subdir = args.subdir
self.source = args.source
self.url = args.url
self._init_owner_repo()
self.xhash = args.hash
self._init_hasher()
self.commit_ts = None # lazy load commit timestamp
self.commit_ts_cache = GitHubCommitTsCache()
self.name = 'github-tarball'
def download(self):
"""Download and repack GitHub archive tarball."""
self._init_commit_ts()
with Path(TMPDIR_DL, keep=True) as dir_dl:
# fetch tarball from GitHub
tarball_path = os.path.join(dir_dl.path, self.subdir + '.tar.gz.dl')
with Path(tarball_path, isdir=False):
self._fetch(tarball_path)
# unpack
d = os.path.join(dir_dl.path, self.subdir + '.untar')
with Path(d, preclean=True) as dir_untar:
tarball_prefix = Path.untar(tarball_path, into=dir_untar.path)
dir0 = os.path.join(dir_untar.path, tarball_prefix)
dir1 = os.path.join(dir_untar.path, self.subdir)
# submodules check
if self._has_submodule(dir0):
raise self._error('Fetching submodules is not yet supported')
# rename subdir
os.rename(dir0, dir1)
# repack
into=os.path.join(TMPDIR_DL, self.source)
Path.tar(dir_untar.path, self.subdir, into=into, ts=self.commit_ts)
try:
self._hash_check(into)
except Exception:
Path.rm_all(into)
raise
# move to target location
file1 = os.path.join(self.dl_dir, self.source)
if into != file1:
shutil.move(into, file1)
def _has_submodule(self, dir_):
m = os.path.join(dir_, '.gitmodules')
try:
st = os.stat(m)
return st.st_size > 0
except OSError as e:
return e.errno != errno.ENOENT
def _init_owner_repo(self):
m = self.__repo_url_regex.search(self.url)
if m is None:
raise self._error('Invalid github url: {}'.format(self.url))
owner = m.group('owner')
repo = m.group('repo')
if repo.endswith('.git'):
repo = repo[:-4]
self.owner = owner
self.repo = repo
def _init_hasher(self):
xhash = self.xhash
if len(xhash) == 64:
self.hasher = hashlib.sha256()
elif len(xhash) == 32:
self.hasher = hashlib.md5()
else:
raise self._error('Requires sha256sum for verification')
self.xhash = xhash
def _hash_check(self, f):
with open(f, 'rb') as fin:
while True:
d = fin.read(4096)
if not d:
break
self.hasher.update(d)
xhash = self.hasher.hexdigest()
if xhash != self.xhash:
raise self._error('Wrong hash (probably caused by .gitattributes), expecting {}, got {}'.format(self.xhash, xhash))
def _init_commit_ts(self):
if self.commit_ts is not None:
return
# GitHub provides 2 APIs[1,2] for fetching commit data. API[1] is more
# terse while API[2] provides more verbose info such as commit diff
# etc. That's the main reason why API[1] is preferred: the response
# size is predictable.
#
# However, API[1] only accepts complete commit sha1sum as the parameter
# while API[2] is more liberal accepting also partial commit id and
# tags, etc.
#
# [1] Get a single commit, Repositories, https://developer.github.com/v3/repos/commits/#get-a-single-commit
# [2] Git Commits, Git Data, https://developer.github.com/v3/git/commits/#get-a-commit
apis = [
{
'url': self._make_repo_url_path('git', 'commits', self.version),
'attr_path': ('committer', 'date'),
}, {
'url': self._make_repo_url_path('commits', self.version),
'attr_path': ('commit', 'committer', 'date'),
},
]
version_is_sha1sum = len(self.version) == 40
if not version_is_sha1sum:
apis.insert(0, apis.pop())
reasons = ''
for api in apis:
url = api['url']
attr_path = api['attr_path']
try:
ct = self.commit_ts_cache.get(url)
if ct is not None:
self.commit_ts = ct
return
ct = self._init_commit_ts_remote_get(url, attr_path)
self.commit_ts = ct
self.commit_ts_cache.set(url, ct)
return
except Exception as e:
reasons += '\n' + (" {}: {}".format(url, e))
raise self._error('Cannot fetch commit ts:{}'.format(reasons))
def _init_commit_ts_remote_get(self, url, attrpath):
resp = self._make_request(url)
data = resp.read()
date = json.loads(data)
for attr in attrpath:
date = date[attr]
date = datetime.datetime.strptime(date, '%Y-%m-%dT%H:%M:%SZ')
date = date.timetuple()
ct = calendar.timegm(date)
return ct
def _fetch(self, path):
"""Fetch tarball of the specified version ref."""
ref = self.version
url = self._make_repo_url_path('tarball', ref)
resp = self._make_request(url)
with open(path, 'wb') as fout:
while True:
d = resp.read(4096)
if not d:
break
fout.write(d)
def _make_repo_url_path(self, *args):
url = '/repos/{0}/{1}'.format(self.owner, self.repo)
if args:
url += '/' + '/'.join(args)
return url
def _make_request(self, path):
"""Request GitHub API endpoint on ``path``."""
url = 'https://api.github.com' + path
headers = {
'Accept': 'application/vnd.github.v3+json',
'User-Agent': 'OpenWrt',
}
req = urllib.request.Request(url, headers=headers)
sslcontext = ssl._create_unverified_context()
fileobj = urllib.request.urlopen(req, context=sslcontext)
return fileobj
def _error(self, msg):
return DownloadGitHubError('{}: {}'.format(self.source, msg))
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--dl-dir', default=os.getcwd(), help='Download dir')
parser.add_argument('--url', help='Download URL')
parser.add_argument('--subdir', help='Source code subdir name')
parser.add_argument('--version', help='Source code version')
parser.add_argument('--source', help='Source tarball filename')
parser.add_argument('--hash', help='Source tarball\'s expected sha256sum')
args = parser.parse_args()
try:
method = DownloadGitHubTarball(args)
method.download()
except Exception as ex:
sys.stderr.write('{}: Download from {} failed\n'.format(args.source, args.url))
sys.stderr.write('{}\n'.format(ex))
sys.exit(1)
if __name__ == '__main__':
main()