X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/7d2c278fa53b6c76eff793b1b38d588bb4cb884d..a72fdca967a7ef8c996757b0992297d2d5c1004c:/pinch.py diff --git a/pinch.py b/pinch.py index 662b425..d4728fe 100644 --- a/pinch.py +++ b/pinch.py @@ -22,8 +22,13 @@ from typing import ( Dict, Iterable, List, + Mapping, + NamedTuple, NewType, + Optional, Tuple, + Type, + Union, ) # Use xdg module when it's less painful to have as a dependency @@ -86,60 +91,106 @@ class ChannelTableEntry(types.SimpleNamespace): url: str -class SearchPath(types.SimpleNamespace, ABC): +class AliasPin(NamedTuple): + pass + + +class GitPin(NamedTuple): + git_revision: str + release_name: str + + +class ChannelPin(NamedTuple): + git_revision: str release_name: str + tarball_url: str + tarball_sha256: str + + +Pin = Union[AliasPin, GitPin, ChannelPin] + + +class SearchPath(types.SimpleNamespace, ABC): @abstractmethod - def pin(self, v: Verification, conf: configparser.SectionProxy) -> None: + def pin(self, v: Verification) -> Pin: pass class AliasSearchPath(SearchPath): alias_of: str - def pin(self, v: Verification, conf: configparser.SectionProxy) -> None: + def pin(self, v: Verification) -> AliasPin: assert not hasattr(self, 'git_repo') + return AliasPin() -class TarrableSearchPath(SearchPath): +# (This lint-disable is for pylint bug https://github.com/PyCQA/pylint/issues/179 +# which is fixed in pylint 2.5.) +class TarrableSearchPath(SearchPath, ABC): # pylint: disable=abstract-method channel_html: bytes channel_url: str forwarded_url: str git_ref: str git_repo: str - git_revision: str - old_git_revision: str table: Dict[str, ChannelTableEntry] - def pin(self, v: Verification, conf: configparser.SectionProxy) -> None: + +class GitSearchPath(TarrableSearchPath): + def pin(self, v: Verification) -> GitPin: + old_revision = ( + self.git_revision if hasattr(self, 'git_revision') else None) if hasattr(self, 'git_revision'): - self.old_git_revision = self.git_revision del self.git_revision - if 'channel_url' in conf: - pin_channel(v, self) - conf['release_name'] = self.release_name - conf['tarball_url'] = self.table['nixexprs.tar.xz'].absolute_url - conf['tarball_sha256'] = self.table['nixexprs.tar.xz'].digest - else: - git_fetch(v, self) - conf['release_name'] = git_revision_name(v, self) - conf['git_revision'] = self.git_revision + new_revision = git_fetch(v, self, None, old_revision) + return GitPin(release_name=git_revision_name(v, self, new_revision), + git_revision=new_revision) def fetch(self, v: Verification, section: str, conf: configparser.SectionProxy) -> str: - if 'git_repo' not in conf or 'release_name' not in conf: + if 'git_revision' not in conf or 'release_name' not in conf: raise Exception( 'Cannot update unpinned channel "%s" (Run "pin" before "update")' % section) + the_pin = GitPin( + release_name=conf['release_name'], + git_revision=conf['git_revision']) + + ensure_git_rev_available(v, self, the_pin, None) + return git_get_tarball(v, self, the_pin) - if 'channel_url' in conf: - return fetch_with_nix_prefetch_url( - v, conf['tarball_url'], Digest16( - conf['tarball_sha256'])) - ensure_git_rev_available(v, self) - return git_get_tarball(v, self) +class ChannelSearchPath(TarrableSearchPath): + def pin(self, v: Verification) -> ChannelPin: + old_revision = ( + self.git_revision if hasattr(self, 'git_revision') else None) + if hasattr(self, 'git_revision'): + del self.git_revision + + fetch(v, self) + new_gitpin = parse_channel(v, self) + fetch_resources(v, self, new_gitpin) + ensure_git_rev_available(v, self, new_gitpin, old_revision) + check_channel_contents(v, self, new_gitpin) + return ChannelPin( + release_name=new_gitpin.release_name, + tarball_url=self.table['nixexprs.tar.xz'].absolute_url, + tarball_sha256=self.table['nixexprs.tar.xz'].digest, + git_revision=self.git_revision) + + # Lint TODO: Put tarball_url and tarball_sha256 in ChannelSearchPath + # pylint: disable=no-self-use + def fetch(self, v: Verification, section: str, + conf: configparser.SectionProxy) -> str: + if 'git_repo' not in conf or 'release_name' not in conf: + raise Exception( + 'Cannot update unpinned channel "%s" (Run "pin" before "update")' % + section) + + return fetch_with_nix_prefetch_url( + v, conf['tarball_url'], Digest16( + conf['tarball_sha256'])) def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]: @@ -179,7 +230,7 @@ def fetch(v: Verification, channel: TarrableSearchPath) -> None: v.check('Got forwarded', channel.channel_url != channel.forwarded_url) -def parse_channel(v: Verification, channel: TarrableSearchPath) -> None: +def parse_channel(v: Verification, channel: TarrableSearchPath) -> GitPin: v.status('Parsing channel description as XML') d = xml.dom.minidom.parseString(channel.channel_html) v.ok() @@ -190,7 +241,6 @@ def parse_channel(v: Verification, channel: TarrableSearchPath) -> None: h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2] v.status(title_name) v.result(title_name == h1_name) - channel.release_name = title_name v.status('Extracting git commit:') git_commit_node = d.getElementsByTagName('tt')[0] @@ -210,6 +260,7 @@ def parse_channel(v: Verification, channel: TarrableSearchPath) -> None: channel.table[name] = ChannelTableEntry( url=url, digest=digest, size=size) v.ok() + return GitPin(release_name=title_name, git_revision=channel.git_revision) def digest_string(s: bytes) -> Digest16: @@ -259,7 +310,10 @@ def fetch_with_nix_prefetch_url( return path # type: ignore # (for old mypy) -def fetch_resources(v: Verification, channel: TarrableSearchPath) -> None: +def fetch_resources( + v: Verification, + channel: ChannelSearchPath, + pin: GitPin) -> None: for resource in ['git-revision', 'nixexprs.tar.xz']: fields = channel.table[resource] fields.absolute_url = urllib.parse.urljoin( @@ -269,7 +323,7 @@ def fetch_resources(v: Verification, channel: TarrableSearchPath) -> None: 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_revision) + channel.table['git-revision'].file).read(999) == pin.git_revision) def git_cachedir(git_repo: str) -> str: @@ -279,17 +333,21 @@ def git_cachedir(git_repo: str) -> str: digest_string(git_repo.encode())) -def tarball_cache_file(channel: TarrableSearchPath) -> str: +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()), - channel.git_revision, - channel.release_name)) + pin.git_revision, + pin.release_name)) -def verify_git_ancestry(v: Verification, channel: TarrableSearchPath) -> None: +def verify_git_ancestry( + v: Verification, + channel: TarrableSearchPath, + new_revision: str, + old_revision: Optional[str]) -> None: cachedir = git_cachedir(channel.git_repo) v.status('Verifying rev is an ancestor of ref') process = subprocess.run(['git', @@ -297,25 +355,29 @@ def verify_git_ancestry(v: Verification, channel: TarrableSearchPath) -> None: cachedir, 'merge-base', '--is-ancestor', - channel.git_revision, + new_revision, channel.git_ref]) v.result(process.returncode == 0) - if hasattr(channel, 'old_git_revision'): + if old_revision is not None: v.status( 'Verifying rev is an ancestor of previous rev %s' % - channel.old_git_revision) + old_revision) process = subprocess.run(['git', '-C', cachedir, 'merge-base', '--is-ancestor', - channel.old_git_revision, - channel.git_revision]) + old_revision, + new_revision]) v.result(process.returncode == 0) -def git_fetch(v: Verification, channel: TarrableSearchPath) -> None: +def git_fetch( + v: Verification, + channel: TarrableSearchPath, + desired_revision: Optional[str], + old_revision: Optional[str]) -> str: # 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 @@ -341,49 +403,53 @@ def git_fetch(v: Verification, channel: TarrableSearchPath) -> None: channel.git_ref)]) v.result(process.returncode == 0) - if hasattr(channel, 'git_revision'): + if desired_revision is not None: v.status('Verifying that fetch retrieved this rev') process = subprocess.run( - ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision]) + ['git', '-C', cachedir, 'cat-file', '-e', desired_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) + new_revision = open( + os.path.join( + cachedir, + 'refs', + 'heads', + channel.git_ref)).read(999).strip() + + verify_git_ancestry(v, channel, new_revision, old_revision) + + return new_revision def ensure_git_rev_available( v: Verification, - channel: TarrableSearchPath) -> None: + channel: TarrableSearchPath, + pin: GitPin, + old_revision: Optional[str]) -> 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]) + ['git', '-C', cachedir, 'cat-file', '-e', pin.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) + verify_git_ancestry(v, channel, pin.git_revision, old_revision) return - git_fetch(v, channel) + git_fetch(v, channel, pin.git_revision, old_revision) def compare_tarball_and_git( v: Verification, - channel: TarrableSearchPath, + 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, channel.release_name), git_contents) + 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) @@ -441,8 +507,11 @@ def git_checkout( v.result(git.returncode == 0 and tar.returncode == 0) -def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str: - cache_file = tarball_cache_file(channel) +def git_get_tarball( + v: Verification, + channel: TarrableSearchPath, + 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): @@ -450,17 +519,17 @@ def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str: with tempfile.TemporaryDirectory() as output_dir: output_filename = os.path.join( - output_dir, channel.release_name + '.tar.xz') + output_dir, pin.release_name + '.tar.xz') with open(output_filename, 'w') as output_file: v.status( 'Generating tarball for git revision %s' % - channel.git_revision) + pin.git_revision) git = subprocess.Popen(['git', '-C', git_cachedir(channel.git_repo), 'archive', - '--prefix=%s/' % channel.release_name, - channel.git_revision], + '--prefix=%s/' % pin.release_name, + pin.git_revision], stdout=subprocess.PIPE) xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file) xz.wait() @@ -480,54 +549,50 @@ def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str: def check_channel_metadata( v: Verification, - channel: TarrableSearchPath, + pin: GitPin, 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) + pin.release_name, + '.git-revision')).read(999) == pin.git_revision) v.status( 'Verifying version-suffix is a suffix of release name %s:' % - channel.release_name) + pin.release_name) version_suffix = open( os.path.join( channel_contents, - channel.release_name, + pin.release_name, '.version-suffix')).read(999) v.status(version_suffix) - v.result(channel.release_name.endswith(version_suffix)) + v.result(pin.release_name.endswith(version_suffix)) def check_channel_contents( v: Verification, - channel: TarrableSearchPath) -> None: + channel: TarrableSearchPath, + pin: GitPin) -> None: with tempfile.TemporaryDirectory() as channel_contents, \ tempfile.TemporaryDirectory() as git_contents: extract_tarball(v, channel, channel_contents) - check_channel_metadata(v, channel, channel_contents) + check_channel_metadata(v, pin, channel_contents) git_checkout(v, channel, git_contents) - compare_tarball_and_git(v, channel, channel_contents, git_contents) + compare_tarball_and_git(v, pin, channel_contents, git_contents) v.status('Removing temporary directories') v.ok() -def pin_channel(v: Verification, channel: TarrableSearchPath) -> None: - fetch(v, channel) - parse_channel(v, channel) - fetch_resources(v, channel) - ensure_git_rev_available(v, channel) - check_channel_contents(v, channel) - - -def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str: +def git_revision_name( + v: Verification, + channel: TarrableSearchPath, + git_revision: str) -> str: v.status('Getting commit date') process = subprocess.run(['git', '-C', @@ -537,7 +602,7 @@ def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str: '--format=%ct-%h', '--abbrev=11', '--no-show-signature', - channel.git_revision], + git_revision], stdout=subprocess.PIPE) v.result(process.returncode == 0 and process.stdout != b'') return '%s-%s' % (os.path.basename(channel.git_repo), @@ -545,9 +610,12 @@ def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str: def read_search_path(conf: configparser.SectionProxy) -> SearchPath: - if 'alias_of' in conf: - return AliasSearchPath(**dict(conf.items())) - return TarrableSearchPath(**dict(conf.items())) + mapping: Mapping[str, Type[SearchPath]] = { + 'alias': AliasSearchPath, + 'channel': ChannelSearchPath, + 'git': GitSearchPath, + } + return mapping[conf['type']](**dict(conf.items())) def read_config(filename: str) -> configparser.ConfigParser: @@ -568,7 +636,7 @@ def read_config_files( return merged_config -def pin(args: argparse.Namespace) -> None: +def pinCommand(args: argparse.Namespace) -> None: v = Verification() config = read_config(args.channels_file) for section in config.sections(): @@ -577,13 +645,13 @@ def pin(args: argparse.Namespace) -> None: sp = read_search_path(config[section]) - sp.pin(v, config[section]) + config[section].update(sp.pin(v)._asdict()) with open(args.channels_file, 'w') as configfile: config.write(configfile) -def update(args: argparse.Namespace) -> None: +def updateCommand(args: argparse.Namespace) -> None: v = Verification() exprs: Dict[str, str] = {} config = read_config_files(args.channels_file) @@ -625,11 +693,11 @@ def main() -> None: parser_pin = subparsers.add_parser('pin') parser_pin.add_argument('channels_file', type=str) parser_pin.add_argument('channels', type=str, nargs='*') - parser_pin.set_defaults(func=pin) + parser_pin.set_defaults(func=pinCommand) parser_update = subparsers.add_parser('update') parser_update.add_argument('--dry-run', action='store_true') parser_update.add_argument('channels_file', type=str, nargs='+') - parser_update.set_defaults(func=update) + parser_update.set_defaults(func=updateCommand) args = parser.parse_args() args.func(args)