+# pinch: PIN CHannels - a replacement for `nix-channel --update`
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, version 3.
+
+
import argparse
import configparser
import filecmp
@staticmethod
def _color(s: str, c: int) -> str:
- return '\033[%2dm%s\033[00m' % (c, s)
+ return f'\033[{c:2d}m{s}\033[00m'
def result(self, r: bool) -> None:
message, color = {True: ('OK ', 92), False: ('FAIL', 91)}[r]
def fetch_channel(
v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]:
- v.status('Fetching channel from %s' % channel.channel_url)
- request = urllib.request.urlopen(channel.channel_url, timeout=10)
- channel_html = request.read().decode()
- forwarded_url = request.geturl()
- v.result(request.status == 200) # type: ignore # (for old mypy)
+ v.status(f'Fetching channel from {channel.channel_url}')
+ with urllib.request.urlopen(channel.channel_url, timeout=10) as request:
+ channel_html = request.read().decode()
+ forwarded_url = request.geturl()
+ v.result(request.status == 200)
v.check('Got forwarded', channel.channel_url != forwarded_url)
return channel_html, forwarded_url
v: Verification,
url: str,
digest: Digest16) -> str:
- v.status('Fetching %s' % url)
+ v.status(f'Fetching {url}')
process = subprocess.run(
['nix-prefetch-url', '--print-path', url, digest], stdout=subprocess.PIPE)
v.result(process.returncode == 0)
assert empty == ''
v.check("Verifying nix-prefetch-url's digest",
to_Digest16(v, Digest32(prefetch_digest)) == digest)
- v.status("Verifying digest of %s" % path)
+ v.status(f"Verifying digest of {path}")
file_digest = digest_file(path)
v.result(file_digest == digest)
return path # type: ignore # (for old mypy)
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(table['git-revision'].file).read(999) == pin.git_revision)
+ with open(table['git-revision'].file, encoding='utf-8') as rev_file:
+ v.result(rev_file.read(999) == pin.git_revision)
def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str:
return os.path.join(
xdg.XDG_CACHE_HOME,
'pinch/git-tarball',
- '%s-%s-%s' %
- (digest_string(channel.git_repo.encode()),
- pin.git_revision,
- pin.release_name))
+ f'{digest_string(channel.git_repo.encode())}-{pin.git_revision}-{pin.release_name}')
def verify_git_ancestry(
old_revision: str,
new_revision: str) -> None:
cachedir = git_cache.git_cachedir(channel.git_repo)
- v.status('Verifying rev is an ancestor of previous rev %s' % old_revision)
+ v.status(f'Verifying rev is an ancestor of previous rev {old_revision}')
process = subprocess.run(['git',
'-C',
cachedir,
match, mismatch, errors = compare(os.path.join(
channel_contents, pin.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)
+ v.check(f'{len(match)} files match', len(match) > 0)
+ v.check(f'{len(mismatch)} files differ', len(mismatch) == 0)
expected_errors = [
'.git-revision',
'.version-suffix',
if ee in errors:
errors.remove(ee)
benign_errors.append(ee)
+ v.check(f'{len(errors)} unexpected incomparable files', len(errors) == 0)
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)),
+ f'({len(benign_errors)} of {len(expected_errors)} expected incomparable files)',
len(benign_errors) == len(expected_errors))
v: Verification,
table: Dict[str, ChannelTableEntry],
dest: str) -> None:
- v.status('Extracting tarball %s' % table['nixexprs.tar.xz'].file)
+ v.status(f"Extracting tarball {table['nixexprs.tar.xz'].file}")
shutil.unpack_archive(table['nixexprs.tar.xz'].file, dest)
v.ok()
pin: GitPin,
dest: str) -> None:
v.status('Checking out corresponding git revision')
- git = subprocess.Popen(['git',
- '-C',
- git_cache.git_cachedir(channel.git_repo),
- 'archive',
- pin.git_revision],
- stdout=subprocess.PIPE)
- tar = subprocess.Popen(
- ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
- if git.stdout:
- git.stdout.close()
- tar.wait()
- git.wait()
- v.result(git.returncode == 0 and tar.returncode == 0)
+ with subprocess.Popen(
+ ['git', '-C', git_cache.git_cachedir(channel.git_repo), 'archive', pin.git_revision],
+ stdout=subprocess.PIPE) as git:
+ with subprocess.Popen(['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout) as tar:
+ if git.stdout:
+ git.stdout.close()
+ tar.wait()
+ git.wait()
+ v.result(git.returncode == 0 and tar.returncode == 0)
def git_get_tarball(
pin: GitPin) -> str:
cache_file = tarball_cache_file(channel, pin)
if os.path.exists(cache_file):
- cached_tarball = open(cache_file).read(9999)
- if os.path.exists(cached_tarball):
- return cached_tarball
+ with open(cache_file, encoding='utf-8') as f:
+ cached_tarball = f.read(9999)
+ if os.path.exists(cached_tarball):
+ return cached_tarball
with tempfile.TemporaryDirectory() as output_dir:
output_filename = os.path.join(
output_dir, pin.release_name + '.tar.xz')
- with open(output_filename, 'w') as output_file:
- v.status(
- 'Generating tarball for git revision %s' %
- pin.git_revision)
- git = subprocess.Popen(['git',
- '-C',
- git_cache.git_cachedir(channel.git_repo),
- 'archive',
- '--prefix=%s/' % pin.release_name,
- pin.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)
+ with open(output_filename, 'w', encoding='utf-8') as output_file:
+ v.status(f'Generating tarball for git revision {pin.git_revision}')
+ with subprocess.Popen(
+ ['git', '-C', git_cache.git_cachedir(channel.git_repo),
+ 'archive', f'--prefix={pin.release_name}/', pin.git_revision],
+ stdout=subprocess.PIPE) as git:
+ with subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file) as xz:
+ xz.wait()
+ git.wait()
+ v.result(git.returncode == 0 and xz.returncode == 0)
store_tarball = copy_to_nix_store(v, output_filename)
os.makedirs(os.path.dirname(cache_file), exist_ok=True)
- open(cache_file, 'w').write(store_tarball)
+ with open(cache_file, 'w', encoding='utf-8') as f:
+ f.write(store_tarball)
return store_tarball # type: ignore # (for old mypy)
pin: GitPin,
channel_contents: str) -> None:
v.status('Verifying git commit in channel tarball')
- v.result(
- open(
- os.path.join(
- channel_contents,
- pin.release_name,
- '.git-revision')).read(999) == pin.git_revision)
+ with open(os.path.join(channel_contents, pin.release_name, '.git-revision'),
+ encoding='utf-8') as f:
+ v.result(f.read(999) == pin.git_revision)
v.status(
- 'Verifying version-suffix is a suffix of release name %s:' %
- pin.release_name)
- version_suffix = open(
- os.path.join(
- channel_contents,
- pin.release_name,
- '.version-suffix')).read(999)
+ f'Verifying version-suffix is a suffix of release name {pin.release_name}:')
+ with open(os.path.join(channel_contents, pin.release_name, '.version-suffix'),
+ encoding='utf-8') as f:
+ version_suffix = f.read(999)
v.status(version_suffix)
v.result(pin.release_name.endswith(version_suffix))
git_revision],
stdout=subprocess.PIPE)
v.result(process.returncode == 0 and process.stdout != b'')
- return '%s-%s' % (os.path.basename(channel.git_repo),
- process.stdout.decode().strip())
+ return f'{os.path.basename(channel.git_repo)}-{process.stdout.decode().strip()}'
K = TypeVar('K')
_, all_fields = filter_dict(dict(conf.items()), set(['type']))
pin_fields, remaining_fields = filter_dict(all_fields, set(P._fields))
# Error suppression works around https://github.com/python/mypy/issues/9007
- pin_present = pin_fields != {} or P._fields == ()
+ pin_present = pin_fields or P._fields == ()
pin = P(**pin_fields) if pin_present else None # type: ignore
return SP(**remaining_fields), pin
sp, pin = read_config_section(conf)
if pin is None:
raise Exception(
- 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
- section)
+ f'Cannot update unpinned channel "{section}" (Run "pin" before "update")')
return sp, pin
def read_config(filename: str) -> configparser.ConfigParser:
config = configparser.ConfigParser()
- config.read_file(open(filename), filename)
+ with open(filename, encoding='utf-8') as f:
+ config.read_file(f, filename)
return config
config = read_config(file)
for section in config.sections():
if section in merged_config:
- raise Exception('Duplicate channel "%s"' % section)
+ raise Exception('Duplicate channel "{section}"')
merged_config[section] = config[section]
return merged_config
config[section].update(sp.pin(v, old_pin)._asdict())
- with open(args.channels_file, 'w') as configfile:
+ with open(args.channels_file, 'w', encoding='utf-8') as configfile:
config.write(configfile)
def updateCommand(args: argparse.Namespace) -> None:
v = Verification()
exprs: Dict[str, str] = {}
- search_paths: List[str] = []
+ profile_manifest = os.path.join(args.profile, "manifest.nix")
+ search_paths: List[str] = [
+ "-I", "pinch_profile=" + args.profile,
+ "-I", "pinch_profile_manifest=" + os.readlink(profile_manifest)
+ ] if os.path.exists(profile_manifest) else []
config = {
section: read_pinned_config_section(section, conf) for section,
conf in read_config_files(
assert not isinstance(sp, AliasSearchPath) # mypy can't see through
assert not isinstance(pin, AliasPin) # partition_dict()
tarball = sp.fetch(v, pin)
- search_paths.extend(["-I", "pinch_tarball_for_%s=%s" %
- (pin.release_name, tarball)])
+ search_paths.extend(
+ ["-I", f"pinch_tarball_for_{pin.release_name}={tarball}"])
exprs[section] = (
- 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %
- (pin.release_name, tarball))
+ f'f: f {{ name = "{pin.release_name}"; channelName = "%s"; '
+ f'src = builtins.storePath "{tarball}"; }}')
for section, (sp, pin) in alias.items():
assert isinstance(sp, AliasSearchPath) # For mypy
'--file',
'<nix/unpack-channel.nix>',
'--install',
+ '--remove-all',
] + search_paths + ['--from-expression'] + [
exprs[name] % name for name in sorted(exprs.keys())]
if args.dry_run:
parser_update = subparsers.add_parser('update')
parser_update.add_argument('--dry-run', action='store_true')
parser_update.add_argument('--profile', default=(
- '/nix/var/nix/profiles/per-user/%s/channels' % getpass.getuser()))
+ f'/nix/var/nix/profiles/per-user/{getpass.getuser()}/channels'))
parser_update.add_argument('channels_file', type=str, nargs='+')
parser_update.set_defaults(func=updateCommand)
args = parser.parse_args()
projects / pinch / blobdiff