+import argparse
+import configparser
import filecmp
import functools
+import getpass
import hashlib
import operator
import os
Iterable,
List,
NewType,
- Sequence,
Tuple,
)
class ChannelTableEntry(types.SimpleNamespace):
+ absolute_url: str
digest: Digest16
file: str
size: int
class Channel(types.SimpleNamespace):
channel_html: bytes
+ channel_url: str
forwarded_url: str
+ git_ref: str
+ git_repo: str
git_revision: str
+ old_git_revision: str
release_name: str
table: Dict[str, ChannelTableEntry]
- url: str
class VerificationError(Exception):
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
return filecmp.cmpfiles(a, b, files, shallow=False)
-def fetch(v: Verification, channel_url: str) -> Channel:
- channel = Channel()
- channel.url = channel_url
+def fetch(v: Verification, channel: Channel) -> None:
v.status('Fetching channel')
- request = urllib.request.urlopen(
- 'https://channels.nixos.org/nixos-20.03', timeout=10)
+ request = urllib.request.urlopen(channel.channel_url, timeout=10)
channel.channel_html = request.read()
channel.forwarded_url = request.geturl()
v.result(request.status == 200)
- v.check('Got forwarded', channel.url != channel.forwarded_url)
- return channel
+ v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
def parse_channel(v: Verification, channel: Channel) -> None:
v.status('Extracting git commit:')
git_commit_node = d.getElementsByTagName('tt')[0]
- channel.git_commit = git_commit_node.firstChild.nodeValue
- v.status(channel.git_commit)
+ channel.git_revision = git_commit_node.firstChild.nodeValue
+ v.status(channel.git_revision)
v.ok()
v.status('Verifying git commit label')
v.result(git_commit_node.previousSibling.nodeValue == 'Git commit ')
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:
def fetch_resources(v: Verification, channel: Channel) -> None:
for resource in ['git-revision', 'nixexprs.tar.xz']:
fields = channel.table[resource]
- url = urllib.parse.urljoin(channel.forwarded_url, fields.url)
- fields.file = fetch_with_nix_prefetch_url(v, url, fields.digest)
+ fields.absolute_url = urllib.parse.urljoin(
+ channel.forwarded_url, fields.url)
+ fields.file = fetch_with_nix_prefetch_url(
+ v, fields.absolute_url, fields.digest)
v.status('Verifying git commit on main page matches git commit in table')
v.result(
open(
- channel.table['git-revision'].file).read(999) == channel.git_commit)
+ channel.table['git-revision'].file).read(999) == channel.git_revision)
+
+
+def git_cachedir(git_repo: str) -> str:
+ # TODO: Consider using pyxdg to find this path.
+ return os.path.expanduser(
+ '~/.cache/nix-pin-channel/git/%s' %
+ digest_string(
+ git_repo.encode()))
+
+
+def verify_git_ancestry(v: Verification, channel: Channel) -> None:
+ cachedir = git_cachedir(channel.git_repo)
+ v.status('Verifying rev is an ancestor of ref')
+ process = subprocess.run(['git',
+ '-C',
+ cachedir,
+ 'merge-base',
+ '--is-ancestor',
+ channel.git_revision,
+ channel.git_ref])
+ v.result(process.returncode == 0)
+
+ if hasattr(channel, 'old_git_revision'):
+ v.status(
+ 'Verifying rev is an ancestor of previous rev %s' %
+ channel.old_git_revision)
+ process = subprocess.run(['git',
+ '-C',
+ cachedir,
+ 'merge-base',
+ '--is-ancestor',
+ channel.old_git_revision,
+ channel.git_revision])
+ v.result(process.returncode == 0)
+
+
+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.
+ # :(
+
+ cachedir = git_cachedir(channel.git_repo)
+ if not os.path.exists(cachedir):
+ v.status("Initializing git repo")
+ process = subprocess.run(
+ ['git', 'init', '--bare', cachedir])
+ v.result(process.returncode == 0)
+
+ v.status('Fetching ref "%s" from %s' % (channel.git_ref, channel.git_repo))
+ # We don't use --force here because we want to abort and freak out if forced
+ # updates are happening.
+ process = subprocess.run(['git',
+ '-C',
+ cachedir,
+ 'fetch',
+ channel.git_repo,
+ '%s:%s' % (channel.git_ref,
+ channel.git_ref)])
+ v.result(process.returncode == 0)
+
+ if hasattr(channel, 'git_revision'):
+ v.status('Verifying that fetch retrieved this rev')
+ process = subprocess.run(
+ ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
+ v.result(process.returncode == 0)
+ else:
+ channel.git_revision = open(
+ os.path.join(
+ cachedir,
+ 'refs',
+ 'heads',
+ channel.git_ref)).read(999).strip()
+
+ verify_git_ancestry(v, channel)
+
+
+def ensure_git_rev_available(v: Verification, channel: Channel) -> None:
+ cachedir = git_cachedir(channel.git_repo)
+ if os.path.exists(cachedir):
+ v.status('Checking if we already have this rev:')
+ process = subprocess.run(
+ ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
+ 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 == 0:
+ verify_git_ancestry(v, channel)
+ return
+ git_fetch(v, channel)
+
+
+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',
+ git_cachedir(channel.git_repo),
+ 'archive',
+ channel.git_revision],
+ 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 git_get_tarball(v: Verification, channel: Channel) -> str:
+ with tempfile.TemporaryDirectory() as output_dir:
+ output_filename = os.path.join(
+ output_dir, channel.release_name + '.tar.xz')
+ with open(output_filename, 'w') as output_file:
+ v.status(
+ 'Generating tarball for git revision %s' %
+ channel.git_revision)
+ git = subprocess.Popen(['git',
+ '-C',
+ git_cachedir(channel.git_repo),
+ 'archive',
+ '--prefix=%s/' % channel.release_name,
+ channel.git_revision],
+ stdout=subprocess.PIPE)
+ xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file)
+ xz.wait()
+ git.wait()
+ v.result(git.returncode == 0 and xz.returncode == 0)
+
+ v.status('Putting tarball in Nix store')
+ process = subprocess.run(
+ ['nix-store', '--add', output_filename], capture_output=True)
+ v.result(process.returncode == 0)
+ return process.stdout.decode().strip()
+
+
+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_revision)
+
+ 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 = fetch(v, 'https://channels.nixos.org/nixos-20.03')
+def pin_channel(v: Verification, channel: Channel) -> None:
+ fetch(v, channel)
parse_channel(v, channel)
fetch_resources(v, channel)
+ ensure_git_rev_available(v, channel)
check_channel_contents(v, channel)
- print(channel)
+
+
+def git_revision_name(v: Verification, channel: Channel) -> str:
+ v.status('Getting commit date')
+ process = subprocess.run(['git',
+ '-C',
+ git_cachedir(channel.git_repo),
+ 'lo',
+ '-n1',
+ '--format=%ct-%h',
+ '--abbrev=11',
+ channel.git_revision],
+ capture_output=True)
+ v.result(process.returncode == 0 and process.stdout != '')
+ return '%s-%s' % (os.path.basename(channel.git_repo),
+ process.stdout.decode().strip())
+
+
+def pin(args: argparse.Namespace) -> None:
+ v = Verification()
+ config = configparser.ConfigParser()
+ config.read_file(open(args.channels_file), args.channels_file)
+ for section in config.sections():
+
+ channel = Channel(**dict(config[section].items()))
+ if hasattr(channel, 'git_revision'):
+ channel.old_git_revision = channel.git_revision
+ del channel.git_revision
+
+ if 'channel_url' in config[section]:
+ pin_channel(v, channel)
+ config[section]['release_name'] = channel.release_name
+ config[section]['tarball_url'] = channel.table['nixexprs.tar.xz'].absolute_url
+ config[section]['tarball_sha256'] = channel.table['nixexprs.tar.xz'].digest
+ else:
+ git_fetch(v, channel)
+ config[section]['release_name'] = git_revision_name(v, channel)
+ config[section]['git_revision'] = channel.git_revision
+
+ with open(args.channels_file, 'w') as configfile:
+ config.write(configfile)
+
+
+def update(args: argparse.Namespace) -> None:
+ v = Verification()
+ config = configparser.ConfigParser()
+ config.read_file(open(args.channels_file), args.channels_file)
+ exprs = []
+ for section in config.sections():
+ if 'channel_url' in config[section]:
+ tarball = fetch_with_nix_prefetch_url(
+ v, config[section]['tarball_url'], Digest16(
+ config[section]['tarball_sha256']))
+ else:
+ channel = Channel(**dict(config[section].items()))
+ ensure_git_rev_available(v, channel)
+ tarball = git_get_tarball(v, channel)
+ exprs.append(
+ 'f: f { name = "%s"; channelName = "%s"; src = builtins.storePath "%s"; }' %
+ (config[section]['release_name'], section, tarball))
+ v.status('Installing channels with nix-env')
+ process = subprocess.run(
+ [
+ 'nix-env',
+ '--profile',
+ '/nix/var/nix/profiles/per-user/%s/channels' %
+ getpass.getuser(),
+ '--show-trace',
+ '--file',
+ '<nix/unpack-channel.nix>',
+ '--install',
+ '--from-expression'] +
+ exprs)
+ v.result(process.returncode == 0)
+
+
+def main() -> None:
+ parser = argparse.ArgumentParser(prog='pinch')
+ subparsers = parser.add_subparsers(dest='mode', required=True)
+ parser_pin = subparsers.add_parser('pin')
+ parser_pin.add_argument('channels_file', type=str)
+ parser_pin.set_defaults(func=pin)
+ parser_update = subparsers.add_parser('update')
+ parser_update.add_argument('channels_file', type=str)
+ parser_update.set_defaults(func=update)
+ args = parser.parse_args()
+ args.func(args)
main()
projects / pinch / blobdiff