Iterable,
List,
NewType,
- Sequence,
Tuple,
)
class Channel(types.SimpleNamespace):
channel_html: bytes
forwarded_url: str
+ git_cachedir: str
+ git_ref: str
+ git_repo: str
git_revision: str
release_name: str
table: Dict[str, ChannelTableEntry]
self.result(True)
-def compare(a: str,
- b: str) -> Tuple[Sequence[str],
- Sequence[str],
- Sequence[str]]:
+def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]:
def throw(error: OSError) -> None:
raise error
url = row.childNodes[0].firstChild.getAttribute('href')
size = int(row.childNodes[1].firstChild.nodeValue)
digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue)
- channel.table[name] = ChannelTableEntry(url=url, digest=digest, size=size)
+ channel.table[name] = ChannelTableEntry(
+ url=url, digest=digest, size=size)
v.ok()
+def digest_string(s: bytes) -> Digest16:
+ return Digest16(hashlib.sha256(s).hexdigest())
+
+
def digest_file(filename: str) -> Digest16:
hasher = hashlib.sha256()
with open(filename, 'rb') as f:
channel.table['git-revision'].file).read(999) == channel.git_commit)
+def git_fetch(v: Verification, channel: Channel) -> None:
+ # It would be nice if we could share the nix git cache, but as of the time
+ # of writing it is transitioning from gitv2 (deprecated) to gitv3 (not ready
+ # yet), and trying to straddle them both is too far into nix implementation
+ # details for my comfort. So we re-implement here half of nix.fetchGit.
+ # :(
+
+ # TODO: Consider using pyxdg to find this path.
+ channel.git_cachedir = os.path.expanduser(
+ '~/.cache/nix-pin-channel/git/%s' %
+ digest_string(
+ channel.url.encode()))
+ if not os.path.exists(channel.git_cachedir):
+ v.status("Initializing git repo")
+ process = subprocess.run(
+ ['git', 'init', '--bare', channel.git_cachedir])
+ v.result(process.returncode == 0)
+
+ v.status('Checking if we already have this rev:')
+ process = subprocess.run(
+ ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.git_commit])
+ if process.returncode == 0:
+ v.status('yes')
+ if process.returncode == 1:
+ v.status('no')
+ v.result(process.returncode == 0 or process.returncode == 1)
+ if process.returncode == 1:
+ v.status('Fetching ref "%s"' % channel.git_ref)
+ # We don't use --force here because we want to abort and freak out if forced
+ # updates are happening.
+ process = subprocess.run(['git',
+ '-C',
+ channel.git_cachedir,
+ 'fetch',
+ channel.git_repo,
+ '%s:%s' % (channel.git_ref,
+ channel.git_ref)])
+ v.result(process.returncode == 0)
+ v.status('Verifying that fetch retrieved this rev')
+ process = subprocess.run(
+ ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.git_commit])
+ v.result(process.returncode == 0)
+
+ v.status('Verifying rev is an ancestor of ref')
+ process = subprocess.run(['git',
+ '-C',
+ channel.git_cachedir,
+ 'merge-base',
+ '--is-ancestor',
+ channel.git_commit,
+ channel.git_ref])
+ v.result(process.returncode == 0)
+
+
+def compare_tarball_and_git(
+ v: Verification,
+ channel: Channel,
+ channel_contents: str,
+ git_contents: str) -> None:
+ v.status('Comparing channel tarball with git checkout')
+ match, mismatch, errors = compare(os.path.join(
+ channel_contents, channel.release_name), git_contents)
+ v.ok()
+ v.check('%d files match' % len(match), len(match) > 0)
+ v.check('%d files differ' % len(mismatch), len(mismatch) == 0)
+ expected_errors = [
+ '.git-revision',
+ '.version-suffix',
+ 'nixpkgs',
+ 'programs.sqlite',
+ 'svn-revision']
+ benign_errors = []
+ for ee in expected_errors:
+ if ee in errors:
+ errors.remove(ee)
+ benign_errors.append(ee)
+ v.check(
+ '%d unexpected incomparable files' %
+ len(errors),
+ len(errors) == 0)
+ v.check(
+ '(%d of %d expected incomparable files)' %
+ (len(benign_errors),
+ len(expected_errors)),
+ len(benign_errors) == len(expected_errors))
+
+
+def extract_tarball(v: Verification, channel: Channel, dest: str) -> None:
+ v.status('Extracting tarball %s' %
+ channel.table['nixexprs.tar.xz'].file)
+ shutil.unpack_archive(
+ channel.table['nixexprs.tar.xz'].file,
+ dest)
+ v.ok()
+
+
+def git_checkout(v: Verification, channel: Channel, dest: str) -> None:
+ v.status('Checking out corresponding git revision')
+ git = subprocess.Popen(['git',
+ '-C',
+ channel.git_cachedir,
+ 'archive',
+ channel.git_commit],
+ stdout=subprocess.PIPE)
+ tar = subprocess.Popen(
+ ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
+ git.stdout.close()
+ tar.wait()
+ git.wait()
+ v.result(git.returncode == 0 and tar.returncode == 0)
+
+
+def check_channel_metadata(
+ v: Verification,
+ channel: Channel,
+ channel_contents: str) -> None:
+ v.status('Verifying git commit in channel tarball')
+ v.result(
+ open(
+ os.path.join(
+ channel_contents,
+ channel.release_name,
+ '.git-revision')).read(999) == channel.git_commit)
+
+ v.status(
+ 'Verifying version-suffix is a suffix of release name %s:' %
+ channel.release_name)
+ version_suffix = open(
+ os.path.join(
+ channel_contents,
+ channel.release_name,
+ '.version-suffix')).read(999)
+ v.status(version_suffix)
+ v.result(channel.release_name.endswith(version_suffix))
+
+
def check_channel_contents(v: Verification, channel: Channel) -> None:
- with tempfile.TemporaryDirectory() as d:
- v.status('Extracting %s' % channel.table['nixexprs.tar.xz'].file)
- shutil.unpack_archive(channel.table['nixexprs.tar.xz'].file, d)
- v.ok()
- v.status('Removing temporary directory')
+ with tempfile.TemporaryDirectory() as channel_contents, \
+ tempfile.TemporaryDirectory() as git_contents:
+
+ extract_tarball(v, channel, channel_contents)
+ check_channel_metadata(v, channel, channel_contents)
+
+ git_checkout(v, channel, git_contents)
+
+ compare_tarball_and_git(v, channel, channel_contents, git_contents)
+
+ v.status('Removing temporary directories')
v.ok()
def main() -> None:
v = Verification()
- channel = Channel(url='https://channels.nixos.org/nixos-20.03')
+ channel = Channel(url='https://channels.nixos.org/nixos-20.03',
+ git_repo='https://github.com/NixOS/nixpkgs.git',
+ git_ref='nixos-20.03')
fetch(v, channel)
parse_channel(v, channel)
fetch_resources(v, channel)
+ git_fetch(v, channel)
check_channel_contents(v, channel)
print(channel)
projects / pinch / blobdiff