X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/d815b199fa1d94ba00cd415a1310e80abc57e3b9..e79a920cadeaacdf871e1a10ef48d33c4d97cb02:/pinch.py diff --git a/pinch.py b/pinch.py index 125fa63..2ba47b2 100644 --- a/pinch.py +++ b/pinch.py @@ -11,6 +11,7 @@ import shlex import shutil import subprocess import sys +import tarfile import tempfile import types import urllib.parse @@ -18,6 +19,7 @@ import urllib.request import xml.dom.minidom from typing import ( + Callable, Dict, Iterable, List, @@ -32,6 +34,8 @@ from typing import ( Union, ) +import git_cache + # Use xdg module when it's less painful to have as a dependency @@ -96,6 +100,12 @@ class AliasPin(NamedTuple): pass +class SymlinkPin(NamedTuple): + @property + def release_name(self) -> str: + return 'link' + + class GitPin(NamedTuple): git_revision: str release_name: str @@ -108,7 +118,24 @@ class ChannelPin(NamedTuple): tarball_sha256: str -Pin = Union[AliasPin, GitPin, ChannelPin] +Pin = Union[AliasPin, SymlinkPin, GitPin, ChannelPin] + + +def copy_to_nix_store(v: Verification, filename: str) -> str: + v.status('Putting tarball in Nix store') + process = subprocess.run( + ['nix-store', '--add', filename], stdout=subprocess.PIPE) + v.result(process.returncode == 0) + return process.stdout.decode().strip() # type: ignore # (for old mypy) + + +def symlink_archive(v: Verification, path: str) -> str: + with tempfile.TemporaryDirectory() as td: + archive_filename = os.path.join(td, 'link.tar.gz') + os.symlink(path, os.path.join(td, 'link')) + with tarfile.open(archive_filename, mode='x:gz') as t: + t.add(os.path.join(td, 'link'), arcname='link') + return copy_to_nix_store(v, archive_filename) class AliasSearchPath(NamedTuple): @@ -119,22 +146,33 @@ class AliasSearchPath(NamedTuple): return AliasPin() +class SymlinkSearchPath(NamedTuple): + path: str + + # pylint: disable=no-self-use + def pin(self, _: Verification, __: Optional[Pin]) -> SymlinkPin: + return SymlinkPin() + + def fetch(self, v: Verification, _: Pin) -> str: + return symlink_archive(v, self.path) + + class GitSearchPath(NamedTuple): git_ref: str git_repo: str def pin(self, v: Verification, old_pin: Optional[Pin]) -> GitPin: + _, new_revision = git_cache.fetch(self.git_repo, self.git_ref) if old_pin is not None: assert isinstance(old_pin, GitPin) - old_revision = old_pin.git_revision if old_pin is not None else None - - new_revision = git_fetch(v, self, None, old_revision) + verify_git_ancestry(v, self, old_pin.git_revision, new_revision) return GitPin(release_name=git_revision_name(v, self, new_revision), git_revision=new_revision) def fetch(self, v: Verification, pin: Pin) -> str: assert isinstance(pin, GitPin) - ensure_git_rev_available(v, self, pin, None) + git_cache.ensure_rev_available( + self.git_repo, self.git_ref, pin.git_revision) return git_get_tarball(v, self, pin) @@ -146,12 +184,17 @@ class ChannelSearchPath(NamedTuple): def pin(self, v: Verification, old_pin: Optional[Pin]) -> ChannelPin: if old_pin is not None: assert isinstance(old_pin, ChannelPin) - old_revision = old_pin.git_revision if old_pin is not None else None channel_html, forwarded_url = fetch_channel(v, self) table, new_gitpin = parse_channel(v, channel_html) + if old_pin is not None and old_pin.git_revision == new_gitpin.git_revision: + return old_pin fetch_resources(v, new_gitpin, forwarded_url, table) - ensure_git_rev_available(v, self, new_gitpin, old_revision) + git_cache.ensure_rev_available( + self.git_repo, self.git_ref, new_gitpin.git_revision) + if old_pin is not None: + verify_git_ancestry( + v, self, old_pin.git_revision, new_gitpin.git_revision) check_channel_contents(v, self, table, new_gitpin) return ChannelPin( release_name=new_gitpin.release_name, @@ -167,7 +210,10 @@ class ChannelSearchPath(NamedTuple): v, pin.tarball_url, Digest16(pin.tarball_sha256)) -SearchPath = Union[AliasSearchPath, GitSearchPath, ChannelSearchPath] +SearchPath = Union[AliasSearchPath, + SymlinkSearchPath, + GitSearchPath, + ChannelSearchPath] TarrableSearchPath = Union[GitSearchPath, ChannelSearchPath] @@ -201,9 +247,9 @@ 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') + v.status('Fetching channel from %s' % channel.channel_url) request = urllib.request.urlopen(channel.channel_url, timeout=10) - channel_html = request.read() + channel_html = request.read().decode() forwarded_url = request.geturl() v.result(request.status == 200) # type: ignore # (for old mypy) v.check('Got forwarded', channel.channel_url != forwarded_url) @@ -256,18 +302,39 @@ def digest_file(filename: str) -> Digest16: return Digest16(hasher.hexdigest()) +@functools.lru_cache +def _experimental_flag_needed(v: Verification) -> bool: + v.status('Checking Nix version') + process = subprocess.run(['nix', '--help'], stdout=subprocess.PIPE) + v.result(process.returncode == 0) + return b'--experimental-features' in process.stdout + + +def _nix_command(v: Verification) -> List[str]: + return ['nix', '--experimental-features', + 'nix-command'] if _experimental_flag_needed(v) else ['nix'] + + def to_Digest16(v: Verification, digest32: Digest32) -> Digest16: v.status('Converting digest to base16') - process = subprocess.run( - ['nix', 'to-base16', '--type', 'sha256', digest32], stdout=subprocess.PIPE) + process = subprocess.run(_nix_command(v) + [ + 'to-base16', + '--type', + 'sha256', + digest32], + stdout=subprocess.PIPE) v.result(process.returncode == 0) return Digest16(process.stdout.decode().strip()) def to_Digest32(v: Verification, digest16: Digest16) -> Digest32: v.status('Converting digest to base32') - process = subprocess.run( - ['nix', 'to-base32', '--type', 'sha256', digest16], stdout=subprocess.PIPE) + process = subprocess.run(_nix_command(v) + [ + 'to-base32', + '--type', + 'sha256', + digest16], + stdout=subprocess.PIPE) v.result(process.returncode == 0) return Digest32(process.stdout.decode().strip()) @@ -284,7 +351,7 @@ 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 file digest") + v.status("Verifying digest of %s" % path) file_digest = digest_file(path) v.result(file_digest == digest) return path # type: ignore # (for old mypy) @@ -304,13 +371,6 @@ def fetch_resources( v.result(open(table['git-revision'].file).read(999) == pin.git_revision) -def git_cachedir(git_repo: str) -> str: - return os.path.join( - xdg.XDG_CACHE_HOME, - 'pinch/git', - digest_string(git_repo.encode())) - - def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str: return os.path.join( xdg.XDG_CACHE_HOME, @@ -324,101 +384,19 @@ def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str: 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') + 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) process = subprocess.run(['git', '-C', cachedir, 'merge-base', '--is-ancestor', - new_revision, - channel.git_ref]) - v.result(process.returncode == 0) - - if old_revision is not None: - v.status( - 'Verifying rev is an ancestor of previous rev %s' % - old_revision) - process = subprocess.run(['git', - '-C', - cachedir, - 'merge-base', - '--is-ancestor', - old_revision, - new_revision]) - v.result(process.returncode == 0) - - -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 - # 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)]) + old_revision, + new_revision]) v.result(process.returncode == 0) - if desired_revision is not None: - v.status('Verifying that fetch retrieved this rev') - process = subprocess.run( - ['git', '-C', cachedir, 'cat-file', '-e', desired_revision]) - v.result(process.returncode == 0) - - 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, - 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', 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, pin.git_revision, old_revision) - return - git_fetch(v, channel, pin.git_revision, old_revision) - def compare_tarball_and_git( v: Verification, @@ -470,7 +448,7 @@ def git_checkout( v.status('Checking out corresponding git revision') git = subprocess.Popen(['git', '-C', - git_cachedir(channel.git_repo), + git_cache.git_cachedir(channel.git_repo), 'archive', pin.git_revision], stdout=subprocess.PIPE) @@ -502,7 +480,7 @@ def git_get_tarball( pin.git_revision) git = subprocess.Popen(['git', '-C', - git_cachedir(channel.git_repo), + git_cache.git_cachedir(channel.git_repo), 'archive', '--prefix=%s/' % pin.release_name, pin.git_revision], @@ -512,11 +490,7 @@ def git_get_tarball( 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], stdout=subprocess.PIPE) - v.result(process.returncode == 0) - store_tarball = process.stdout.decode().strip() + 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) @@ -573,7 +547,7 @@ def git_revision_name( v.status('Getting commit date') process = subprocess.run(['git', '-C', - git_cachedir(channel.git_repo), + git_cache.git_cachedir(channel.git_repo), 'log', '-n1', '--format=%ct-%h', @@ -590,34 +564,50 @@ K = TypeVar('K') V = TypeVar('V') -def filter_dict(d: Dict[K, V], fields: Set[K] - ) -> Tuple[Dict[K, V], Dict[K, V]]: +def partition_dict(pred: Callable[[K, V], bool], + d: Dict[K, V]) -> Tuple[Dict[K, V], Dict[K, V]]: selected: Dict[K, V] = {} remaining: Dict[K, V] = {} for k, v in d.items(): - if k in fields: + if pred(k, v): selected[k] = v else: remaining[k] = v return selected, remaining +def filter_dict(d: Dict[K, V], fields: Set[K] + ) -> Tuple[Dict[K, V], Dict[K, V]]: + return partition_dict(lambda k, v: k in fields, d) + + def read_config_section( conf: configparser.SectionProxy) -> Tuple[SearchPath, Optional[Pin]]: mapping: Mapping[str, Tuple[Type[SearchPath], Type[Pin]]] = { 'alias': (AliasSearchPath, AliasPin), 'channel': (ChannelSearchPath, ChannelPin), 'git': (GitSearchPath, GitPin), + 'symlink': (SymlinkSearchPath, SymlinkPin), } SP, P = mapping[conf['type']] _, 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 = P(**pin_fields) if pin_present else None # type:ignore[call-arg] + pin = P(**pin_fields) if pin_present else None # type: ignore return SP(**remaining_fields), pin +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) + return sp, pin + + def read_config(filename: str) -> configparser.ConfigParser: config = configparser.ConfigParser() config.read_file(open(filename), filename) @@ -654,34 +644,38 @@ def pinCommand(args: argparse.Namespace) -> None: def updateCommand(args: argparse.Namespace) -> None: v = Verification() exprs: Dict[str, str] = {} - config = read_config_files(args.channels_file) - for section in config: - sp, pin = read_config_section(config[section]) - if pin is None: - raise Exception( - 'Cannot update unpinned channel "%s" (Run "pin" before "update")' % - section) - if isinstance(sp, AliasSearchPath): - continue + search_paths: List[str] = [] + config = { + section: read_pinned_config_section(section, conf) for section, + conf in read_config_files( + args.channels_file).items()} + alias, nonalias = partition_dict( + lambda k, v: isinstance(v[0], AliasSearchPath), config) + + for section, (sp, pin) in sorted(nonalias.items()): + 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)]) exprs[section] = ( 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' % - (config[section]['release_name'], tarball)) + (pin.release_name, tarball)) - for section in config: - if 'alias_of' in config[section]: - exprs[section] = exprs[str(config[section]['alias_of'])] + for section, (sp, pin) in alias.items(): + assert isinstance(sp, AliasSearchPath) # For mypy + exprs[section] = exprs[sp.alias_of] command = [ 'nix-env', '--profile', - '/nix/var/nix/profiles/per-user/%s/channels' % - getpass.getuser(), + args.profile, '--show-trace', '--file', '', '--install', - '--from-expression'] + [exprs[name] % name for name in sorted(exprs.keys())] + ] + search_paths + ['--from-expression'] + [ + exprs[name] % name for name in sorted(exprs.keys())] if args.dry_run: print(' '.join(map(shlex.quote, command))) else: @@ -699,6 +693,8 @@ def main() -> None: 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('--profile', default=( + '/nix/var/nix/profiles/per-user/%s/channels' % getpass.getuser())) parser_update.add_argument('channels_file', type=str, nargs='+') parser_update.set_defaults(func=updateCommand) args = parser.parse_args()