+from abc import ABC, abstractmethod
import argparse
import configparser
import filecmp
Dict,
Iterable,
List,
+ Mapping,
+ NamedTuple,
NewType,
Tuple,
+ Type,
+ Union,
)
# Use xdg module when it's less painful to have as a dependency
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
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_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)
+ return git_get_tarball(v, self, the_pin)
+
+
+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
+
+ fetch(v, self)
+ new_gitpin = parse_channel(v, self)
+ fetch_resources(v, self, new_gitpin)
+ ensure_git_rev_available(v, self, new_gitpin)
+ check_channel_contents(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:
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()
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) -> GitPin:
v.status('Parsing channel description as XML')
d = xml.dom.minidom.parseString(channel.channel_html)
v.ok()
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:
return path # type: ignore # (for old mypy)
-def fetch_resources(v: Verification, channel: Channel) -> 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(
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:
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',
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',
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
verify_git_ancestry(v, channel)
-def ensure_git_rev_available(v: Verification, channel: Channel) -> None:
+def ensure_git_rev_available(
+ v: Verification,
+ channel: TarrableSearchPath,
+ pin: GitPin) -> 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:
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')
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(
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',
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,
+ pin: GitPin) -> str:
cache_file = tarball_cache_file(channel)
if os.path.exists(cache_file):
cached_tarball = open(cache_file).read(9999)
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()
def check_channel_metadata(
v: Verification,
- channel: Channel,
+ channel: TarrableSearchPath,
channel_contents: str) -> None:
v.status('Verifying git commit in channel tarball')
v.result(
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:
v.ok()
-def pin_channel(v: Verification, channel: Channel) -> 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: Channel) -> str:
+def git_revision_name(v: Verification, channel: TarrableSearchPath) -> str:
v.status('Getting commit date')
process = subprocess.run(['git',
'-C',
process.stdout.decode().strip())
+def read_search_path(conf: configparser.SectionProxy) -> SearchPath:
+ 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:
config = configparser.ConfigParser()
config.read_file(open(filename), filename)
return config
-def pin(args: argparse.Namespace) -> None:
+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 pinCommand(args: argparse.Namespace) -> None:
v = Verification()
config = read_config(args.channels_file)
for section in config.sections():
if args.channels and section not in args.channels:
continue
- channel = Channel(**dict(config[section].items()))
-
- 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
+ sp = read_search_path(config[section])
- 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:
+def updateCommand(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))
+ 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 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'])]
+ for section in config:
+ if 'alias_of' in config[section]:
+ exprs[section] = exprs[str(config[section]['alias_of'])]
command = [
'nix-env',
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)
projects / pinch / blobdiff