X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/7c4de64c46013216cfef1d7fb34878b317a11ab6..0a4ff8dde934f9921371da9600e473dd090a7425:/pinch.py diff --git a/pinch.py b/pinch.py index 47f4e34..f5fbb48 100644 --- a/pinch.py +++ b/pinch.py @@ -1,3 +1,4 @@ +from abc import ABC, abstractmethod import argparse import configparser import filecmp @@ -21,8 +22,10 @@ from typing import ( Dict, Iterable, List, + NamedTuple, NewType, Tuple, + Union, ) # Use xdg module when it's less painful to have as a dependency @@ -38,31 +41,6 @@ xdg = XDG( os.path.expanduser('~/.cache'))) -Digest16 = NewType('Digest16', str) -Digest32 = NewType('Digest32', str) - - -class ChannelTableEntry(types.SimpleNamespace): - absolute_url: str - digest: Digest16 - file: str - size: int - url: str - - -class Channel(types.SimpleNamespace): - alias_of: str - 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] - - class VerificationError(Exception): pass @@ -98,6 +76,112 @@ class Verification: self.result(True) +Digest16 = NewType('Digest16', str) +Digest32 = NewType('Digest32', str) + + +class ChannelTableEntry(types.SimpleNamespace): + absolute_url: str + digest: Digest16 + file: str + size: int + url: str + + +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) -> Pin: + pass + + +class AliasSearchPath(SearchPath): + alias_of: str + + def pin(self, v: Verification) -> AliasPin: + assert not hasattr(self, 'git_repo') + return AliasPin() + + +# (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 + old_git_revision: str + table: Dict[str, ChannelTableEntry] + + +class GitSearchPath(TarrableSearchPath): + def pin(self, v: Verification) -> GitPin: + if hasattr(self, 'git_revision'): + self.old_git_revision = self.git_revision + del self.git_revision + + git_fetch(v, self) + return GitPin(release_name=git_revision_name(v, self), + git_revision=self.git_revision) + + 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) + + ensure_git_rev_available(v, self) + return git_get_tarball(v, self) + + +class ChannelSearchPath(TarrableSearchPath): + def pin(self, v: Verification) -> ChannelPin: + if hasattr(self, 'git_revision'): + self.old_git_revision = self.git_revision + del self.git_revision + + pin_channel(v, self) + return ChannelPin( + release_name=self.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]]: def throw(error: OSError) -> None: @@ -126,7 +210,7 @@ def compare(a: str, b: str) -> Tuple[List[str], List[str], List[str]]: return filecmp.cmpfiles(a, b, files, shallow=False) -def fetch(v: Verification, channel: Channel) -> None: +def fetch(v: Verification, channel: TarrableSearchPath) -> None: v.status('Fetching channel') request = urllib.request.urlopen(channel.channel_url, timeout=10) channel.channel_html = request.read() @@ -135,7 +219,7 @@ def fetch(v: Verification, channel: Channel) -> None: v.check('Got forwarded', channel.channel_url != channel.forwarded_url) -def parse_channel(v: Verification, channel: Channel) -> None: +def parse_channel(v: Verification, channel: TarrableSearchPath) -> None: v.status('Parsing channel description as XML') d = xml.dom.minidom.parseString(channel.channel_html) v.ok() @@ -215,7 +299,7 @@ def fetch_with_nix_prefetch_url( return path # type: ignore # (for old mypy) -def fetch_resources(v: Verification, channel: Channel) -> None: +def fetch_resources(v: Verification, channel: TarrableSearchPath) -> None: for resource in ['git-revision', 'nixexprs.tar.xz']: fields = channel.table[resource] fields.absolute_url = urllib.parse.urljoin( @@ -235,7 +319,7 @@ def git_cachedir(git_repo: str) -> str: digest_string(git_repo.encode())) -def tarball_cache_file(channel: Channel) -> str: +def tarball_cache_file(channel: TarrableSearchPath) -> str: return os.path.join( xdg.XDG_CACHE_HOME, 'pinch/git-tarball', @@ -245,7 +329,7 @@ def tarball_cache_file(channel: Channel) -> str: channel.release_name)) -def verify_git_ancestry(v: Verification, channel: Channel) -> None: +def verify_git_ancestry(v: Verification, channel: TarrableSearchPath) -> None: cachedir = git_cachedir(channel.git_repo) v.status('Verifying rev is an ancestor of ref') process = subprocess.run(['git', @@ -271,7 +355,7 @@ def verify_git_ancestry(v: Verification, channel: Channel) -> None: v.result(process.returncode == 0) -def git_fetch(v: Verification, channel: Channel) -> None: +def git_fetch(v: Verification, channel: TarrableSearchPath) -> 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 @@ -313,7 +397,9 @@ def git_fetch(v: Verification, channel: Channel) -> None: verify_git_ancestry(v, channel) -def ensure_git_rev_available(v: Verification, channel: Channel) -> None: +def ensure_git_rev_available( + v: Verification, + channel: TarrableSearchPath) -> None: cachedir = git_cachedir(channel.git_repo) if os.path.exists(cachedir): v.status('Checking if we already have this rev:') @@ -332,7 +418,7 @@ def ensure_git_rev_available(v: Verification, channel: Channel) -> None: def compare_tarball_and_git( v: Verification, - channel: Channel, + channel: TarrableSearchPath, channel_contents: str, git_contents: str) -> None: v.status('Comparing channel tarball with git checkout') @@ -363,7 +449,10 @@ def compare_tarball_and_git( len(benign_errors) == len(expected_errors)) -def extract_tarball(v: Verification, channel: Channel, dest: str) -> None: +def extract_tarball( + v: Verification, + channel: TarrableSearchPath, + dest: str) -> None: v.status('Extracting tarball %s' % channel.table['nixexprs.tar.xz'].file) shutil.unpack_archive( @@ -372,7 +461,10 @@ def extract_tarball(v: Verification, channel: Channel, dest: str) -> None: v.ok() -def git_checkout(v: Verification, channel: Channel, dest: str) -> None: +def git_checkout( + v: Verification, + channel: TarrableSearchPath, + dest: str) -> None: v.status('Checking out corresponding git revision') git = subprocess.Popen(['git', '-C', @@ -389,7 +481,7 @@ def git_checkout(v: Verification, channel: Channel, dest: str) -> None: v.result(git.returncode == 0 and tar.returncode == 0) -def git_get_tarball(v: Verification, channel: Channel) -> str: +def git_get_tarball(v: Verification, channel: TarrableSearchPath) -> str: cache_file = tarball_cache_file(channel) if os.path.exists(cache_file): cached_tarball = open(cache_file).read(9999) @@ -428,7 +520,7 @@ def git_get_tarball(v: Verification, channel: Channel) -> str: def check_channel_metadata( v: Verification, - channel: Channel, + channel: TarrableSearchPath, channel_contents: str) -> None: v.status('Verifying git commit in channel tarball') v.result( @@ -450,7 +542,9 @@ def check_channel_metadata( v.result(channel.release_name.endswith(version_suffix)) -def check_channel_contents(v: Verification, channel: Channel) -> None: +def check_channel_contents( + v: Verification, + channel: TarrableSearchPath) -> None: with tempfile.TemporaryDirectory() as channel_contents, \ tempfile.TemporaryDirectory() as git_contents: @@ -465,7 +559,7 @@ def check_channel_contents(v: Verification, channel: Channel) -> None: v.ok() -def pin_channel(v: Verification, channel: Channel) -> None: +def pin_channel(v: Verification, channel: TarrableSearchPath) -> None: fetch(v, channel) parse_channel(v, channel) fetch_resources(v, channel) @@ -473,7 +567,7 @@ def pin_channel(v: Verification, channel: Channel) -> None: check_channel_contents(v, channel) -def git_revision_name(v: Verification, channel: Channel) -> str: +def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str: v.status('Getting commit date') process = subprocess.run(['git', '-C', @@ -490,12 +584,32 @@ def git_revision_name(v: Verification, channel: Channel) -> str: process.stdout.decode().strip()) +def read_search_path(conf: configparser.SectionProxy) -> SearchPath: + if 'alias_of' in conf: + return AliasSearchPath(**dict(conf.items())) + if 'channel_url' in conf: + return ChannelSearchPath(**dict(conf.items())) + return GitSearchPath(**dict(conf.items())) + + def read_config(filename: str) -> configparser.ConfigParser: config = configparser.ConfigParser() config.read_file(open(filename), filename) return config +def read_config_files( + filenames: Iterable[str]) -> Dict[str, configparser.SectionProxy]: + merged_config: Dict[str, configparser.SectionProxy] = {} + for file in filenames: + config = read_config(file) + for section in config.sections(): + if section in merged_config: + raise Exception('Duplicate channel "%s"' % section) + merged_config[section] = config[section] + return merged_config + + def pin(args: argparse.Namespace) -> None: v = Verification() config = read_config(args.channels_file) @@ -503,72 +617,31 @@ def pin(args: argparse.Namespace) -> None: if args.channels and section not in args.channels: continue - channel = Channel(**dict(config[section].items())) + sp = read_search_path(config[section]) - if hasattr(channel, 'alias_of'): - assert not hasattr(channel, 'git_repo') - continue - - 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 + config[section].update(sp.pin(v)._asdict()) with open(args.channels_file, 'w') as configfile: config.write(configfile) -def fetch_channel( - 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) - - if 'channel_url' in conf: - return fetch_with_nix_prefetch_url( - v, conf['tarball_url'], Digest16( - conf['tarball_sha256'])) - - channel = Channel(**dict(conf.items())) - ensure_git_rev_available(v, channel) - return git_get_tarball(v, channel) - - def update(args: argparse.Namespace) -> None: v = Verification() - config = configparser.ConfigParser() exprs: Dict[str, str] = {} - configs = [read_config(filename) for filename in args.channels_file] - for config in configs: - for section in config.sections(): - if 'alias_of' in config[section]: - assert 'git_repo' not in config[section] - continue - tarball = fetch_channel(v, section, config[section]) - if section in exprs: - raise Exception('Duplicate channel "%s"' % section) - exprs[section] = ( - 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' % - (config[section]['release_name'], tarball)) - - for config in configs: - for section in config.sections(): - if 'alias_of' in config[section]: - if section in exprs: - raise Exception('Duplicate channel "%s"' % section) - exprs[section] = exprs[str(config[section]['alias_of'])] + config = read_config_files(args.channels_file) + for section in config: + sp = read_search_path(config[section]) + if isinstance(sp, AliasSearchPath): + assert 'git_repo' not in config[section] + continue + tarball = sp.fetch(v, section, config[section]) + exprs[section] = ( + 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' % + (config[section]['release_name'], tarball)) + + for section in config: + if 'alias_of' in config[section]: + exprs[section] = exprs[str(config[section]['alias_of'])] command = [ 'nix-env',