X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/fb27ccc70e0a525aed5d03b2347a0b933ebc3053..e97fe8ac3e67ab5c41aa269cb8d85f6fa24df494:/pinch.py?ds=inline diff --git a/pinch.py b/pinch.py index 79622f4..9e80c01 100644 --- a/pinch.py +++ b/pinch.py @@ -1,3 +1,10 @@ +# 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 @@ -64,7 +71,7 @@ class Verification: @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] @@ -141,7 +148,6 @@ def symlink_archive(v: Verification, path: str) -> str: class AliasSearchPath(NamedTuple): alias_of: str - # pylint: disable=no-self-use def pin(self, _: Verification, __: Optional[Pin]) -> AliasPin: return AliasPin() @@ -149,7 +155,6 @@ class AliasSearchPath(NamedTuple): class SymlinkSearchPath(NamedTuple): path: str - # pylint: disable=no-self-use def pin(self, _: Verification, __: Optional[Pin]) -> SymlinkPin: return SymlinkPin() @@ -202,7 +207,6 @@ class ChannelSearchPath(NamedTuple): tarball_sha256=table['nixexprs.tar.xz'].digest, git_revision=new_gitpin.git_revision) - # pylint: disable=no-self-use def fetch(self, v: Verification, pin: Pin) -> str: assert isinstance(pin, ChannelPin) @@ -247,7 +251,7 @@ def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]: def fetch_channel( v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]: - v.status('Fetching channel from %s' % channel.channel_url) + 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() @@ -262,15 +266,29 @@ def parse_channel(v: Verification, channel_html: str) \ d = xml.dom.minidom.parseString(channel_html) v.ok() - v.status('Extracting release name:') - title_name = d.getElementsByTagName( - 'title')[0].firstChild.nodeValue.split()[2] - h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2] - v.status(title_name) - v.result(title_name == h1_name) - - v.status('Extracting git commit:') + v.status('Finding release name (1)') + title = d.getElementsByTagName('title')[0].firstChild + v.result(isinstance(title, xml.dom.minidom.CharacterData)) + assert isinstance(title, xml.dom.minidom.CharacterData) + release_name = title.nodeValue.split()[2] + v.status('Finding release name (2)') + h1 = d.getElementsByTagName('h1')[0].firstChild + v.result(isinstance(h1, xml.dom.minidom.CharacterData)) + assert isinstance(h1, xml.dom.minidom.CharacterData) + v.status('Verifying release name:') + v.status(release_name) + v.result(release_name == h1.nodeValue.split()[2]) + + v.status('Finding git commit') git_commit_node = d.getElementsByTagName('tt')[0] + v.result( + isinstance( + git_commit_node.firstChild, + xml.dom.minidom.CharacterData)) + assert isinstance( + git_commit_node.firstChild, + xml.dom.minidom.CharacterData) + v.status('Extracting git commit:') git_revision = git_commit_node.firstChild.nodeValue v.status(git_revision) v.ok() @@ -286,7 +304,7 @@ def parse_channel(v: Verification, channel_html: str) \ digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue) table[name] = ChannelTableEntry(url=url, digest=digest, size=size) v.ok() - return table, GitPin(release_name=title_name, git_revision=git_revision) + return table, GitPin(release_name=release_name, git_revision=git_revision) def digest_string(s: bytes) -> Digest16: @@ -343,7 +361,7 @@ def fetch_with_nix_prefetch_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) @@ -351,7 +369,7 @@ def fetch_with_nix_prefetch_url( 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) @@ -376,10 +394,7 @@ 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( @@ -388,7 +403,7 @@ 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, @@ -399,44 +414,55 @@ def verify_git_ancestry( v.result(process.returncode == 0) +def broken_symlinks_are_identical(root1: str, root2: str, path: str) -> bool: + a = os.path.join(root1, path) + b = os.path.join(root2, path) + return (os.path.islink(a) + and os.path.islink(b) + and not os.path.exists(a) + and not os.path.exists(b) + and os.readlink(a) == os.readlink(b)) + + def compare_tarball_and_git( v: Verification, pin: GitPin, channel_contents: str, git_contents: str) -> None: v.status('Comparing channel tarball with git checkout') - match, mismatch, errors = compare(os.path.join( - channel_contents, pin.release_name), git_contents) + tarball_contents = os.path.join(channel_contents, pin.release_name) + match, mismatch, errors = compare(tarball_contents, 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', 'nixpkgs', 'programs.sqlite', 'svn-revision'] - benign_errors = [] + benign_expected_errors = [] for ee in expected_errors: if ee in errors: errors.remove(ee) - benign_errors.append(ee) + benign_expected_errors.append(ee) + errors = [ + e for e in errors + if not broken_symlinks_are_identical(tarball_contents, git_contents, e) + ] v.check( - '%d unexpected incomparable files' % - len(errors), + f'{len(errors)} unexpected incomparable files: {errors}', len(errors) == 0) v.check( - '(%d of %d expected incomparable files)' % - (len(benign_errors), - len(expected_errors)), - len(benign_errors) == len(expected_errors)) + f'({len(benign_expected_errors)} of {len(expected_errors)} expected incomparable files)', + len(benign_expected_errors) == len(expected_errors)) def extract_tarball( 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() @@ -473,12 +499,10 @@ def git_get_tarball( output_filename = os.path.join( output_dir, pin.release_name + '.tar.xz') with open(output_filename, 'w', encoding='utf-8') as output_file: - v.status( - 'Generating tarball for git revision %s' % - pin.git_revision) + v.status(f'Generating tarball for git revision {pin.git_revision}') with subprocess.Popen( ['git', '-C', git_cache.git_cachedir(channel.git_repo), - 'archive', '--prefix=%s/' % pin.release_name, pin.git_revision], + '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() @@ -503,8 +527,7 @@ def check_channel_metadata( v.result(f.read(999) == pin.git_revision) v.status( - 'Verifying version-suffix is a suffix of release name %s:' % - pin.release_name) + 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) @@ -547,8 +570,7 @@ def git_revision_name( 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') @@ -584,7 +606,7 @@ def read_config_section( _, 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 @@ -593,9 +615,8 @@ def read_pinned_config_section( section: str, conf: configparser.SectionProxy) -> Tuple[SearchPath, Pin]: sp, pin = read_config_section(conf) if pin is None: - raise Exception( - 'Cannot update unpinned channel "%s" (Run "pin" before "update")' % - section) + raise RuntimeError( + f'Cannot update unpinned channel "{section}" (Run "pin" before "update")') return sp, pin @@ -613,7 +634,7 @@ def read_config_files( config = read_config(file) for section in config.sections(): if section in merged_config: - raise Exception('Duplicate channel "%s"' % section) + raise RuntimeError('Duplicate channel "{section}"') merged_config[section] = config[section] return merged_config @@ -652,11 +673,11 @@ def updateCommand(args: argparse.Namespace) -> None: 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 @@ -691,7 +712,7 @@ def main() -> None: 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()