-from abc import ABC, abstractmethod
import argparse
import configparser
import filecmp
NamedTuple,
NewType,
Optional,
+ Set,
Tuple,
Type,
+ TypeVar,
Union,
)
Pin = Union[AliasPin, GitPin, ChannelPin]
-class SearchPath(types.SimpleNamespace, ABC):
-
- @abstractmethod
- def pin(self, v: Verification) -> Pin:
- pass
-
-
-class AliasSearchPath(SearchPath):
+class AliasSearchPath(NamedTuple):
alias_of: str
- def pin(self, v: Verification) -> AliasPin:
- assert not hasattr(self, 'git_repo')
+ # pylint: disable=no-self-use
+ def pin(self, _: Verification, __: Optional[Pin]) -> AliasPin:
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
+class GitSearchPath(NamedTuple):
git_ref: str
git_repo: str
- table: Dict[str, ChannelTableEntry]
-
-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'):
- del self.git_revision
+ def pin(self, v: Verification, old_pin: Optional[Pin]) -> GitPin:
+ 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)
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_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'])
+ def fetch(self, v: Verification, pin: Pin) -> str:
+ assert isinstance(pin, GitPin)
+ ensure_git_rev_available(v, self, pin, None)
+ return git_get_tarball(v, self, pin)
- ensure_git_rev_available(v, self, the_pin, None)
- return git_get_tarball(v, self, the_pin)
+class ChannelSearchPath(NamedTuple):
+ channel_url: str
+ git_ref: str
+ git_repo: str
-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
+ 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
- fetch(v, self)
- new_gitpin = parse_channel(v, self)
- fetch_resources(v, self, new_gitpin)
+ channel_html, forwarded_url = fetch_channel(v, self)
+ table, new_gitpin = parse_channel(v, channel_html)
+ fetch_resources(v, new_gitpin, forwarded_url, table)
ensure_git_rev_available(v, self, new_gitpin, old_revision)
- check_channel_contents(v, self, new_gitpin)
+ check_channel_contents(v, self, table, 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,
+ tarball_url=table['nixexprs.tar.xz'].absolute_url,
+ tarball_sha256=table['nixexprs.tar.xz'].digest,
git_revision=new_gitpin.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)
+ def fetch(self, v: Verification, pin: Pin) -> str:
+ assert isinstance(pin, ChannelPin)
return fetch_with_nix_prefetch_url(
- v, conf['tarball_url'], Digest16(
- conf['tarball_sha256']))
+ v, pin.tarball_url, Digest16(pin.tarball_sha256))
+
+
+SearchPath = Union[AliasSearchPath, GitSearchPath, ChannelSearchPath]
+TarrableSearchPath = Union[GitSearchPath, ChannelSearchPath]
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: TarrableSearchPath) -> None:
+def fetch_channel(
+ v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]:
v.status('Fetching channel')
request = urllib.request.urlopen(channel.channel_url, timeout=10)
- channel.channel_html = request.read()
- channel.forwarded_url = request.geturl()
+ channel_html = request.read()
+ forwarded_url = request.geturl()
v.result(request.status == 200) # type: ignore # (for old mypy)
- v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
+ v.check('Got forwarded', channel.channel_url != forwarded_url)
+ return channel_html, forwarded_url
-def parse_channel(v: Verification, channel: TarrableSearchPath) -> GitPin:
+def parse_channel(v: Verification, channel_html: str) \
+ -> Tuple[Dict[str, ChannelTableEntry], GitPin]:
v.status('Parsing channel description as XML')
- d = xml.dom.minidom.parseString(channel.channel_html)
+ d = xml.dom.minidom.parseString(channel_html)
v.ok()
v.status('Extracting release name:')
v.result(git_commit_node.previousSibling.nodeValue == 'Git commit ')
v.status('Parsing table')
- channel.table = {}
+ table: Dict[str, ChannelTableEntry] = {}
for row in d.getElementsByTagName('tr')[1:]:
name = row.childNodes[0].firstChild.firstChild.nodeValue
url = row.childNodes[0].firstChild.getAttribute('href')
size = int(row.childNodes[1].firstChild.nodeValue)
digest = Digest16(row.childNodes[2].firstChild.firstChild.nodeValue)
- channel.table[name] = ChannelTableEntry(
- url=url, digest=digest, size=size)
+ table[name] = ChannelTableEntry(url=url, digest=digest, size=size)
v.ok()
- return GitPin(release_name=title_name, git_revision=git_revision)
+ return table, GitPin(release_name=title_name, git_revision=git_revision)
def digest_string(s: bytes) -> Digest16:
def fetch_resources(
v: Verification,
- channel: ChannelSearchPath,
- pin: GitPin) -> None:
+ pin: GitPin,
+ forwarded_url: str,
+ table: Dict[str, ChannelTableEntry]) -> None:
for resource in ['git-revision', 'nixexprs.tar.xz']:
- fields = channel.table[resource]
- fields.absolute_url = urllib.parse.urljoin(
- channel.forwarded_url, fields.url)
+ fields = table[resource]
+ fields.absolute_url = urllib.parse.urljoin(forwarded_url, fields.url)
fields.file = fetch_with_nix_prefetch_url(
v, fields.absolute_url, fields.digest)
v.status('Verifying git commit on main page matches git commit in table')
- v.result(
- open(
- channel.table['git-revision'].file).read(999) == pin.git_revision)
+ v.result(open(table['git-revision'].file).read(999) == pin.git_revision)
def git_cachedir(git_repo: str) -> str:
def extract_tarball(
v: Verification,
- channel: TarrableSearchPath,
+ table: Dict[str, ChannelTableEntry],
dest: str) -> None:
- v.status('Extracting tarball %s' %
- channel.table['nixexprs.tar.xz'].file)
- shutil.unpack_archive(
- channel.table['nixexprs.tar.xz'].file,
- dest)
+ v.status('Extracting tarball %s' % table['nixexprs.tar.xz'].file)
+ shutil.unpack_archive(table['nixexprs.tar.xz'].file, dest)
v.ok()
def check_channel_contents(
v: Verification,
channel: TarrableSearchPath,
+ table: Dict[str, ChannelTableEntry],
pin: GitPin) -> None:
with tempfile.TemporaryDirectory() as channel_contents, \
tempfile.TemporaryDirectory() as git_contents:
- extract_tarball(v, channel, channel_contents)
+ extract_tarball(v, table, channel_contents)
check_channel_metadata(v, pin, channel_contents)
git_checkout(v, channel, pin, git_contents)
process.stdout.decode().strip())
-def read_search_path(conf: configparser.SectionProxy) -> SearchPath:
- mapping: Mapping[str, Type[SearchPath]] = {
- 'alias': AliasSearchPath,
- 'channel': ChannelSearchPath,
- 'git': GitSearchPath,
+K = TypeVar('K')
+V = TypeVar('V')
+
+
+def filter_dict(d: Dict[K, V], fields: Set[K]
+ ) -> 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:
+ selected[k] = v
+ else:
+ remaining[k] = v
+ return selected, remaining
+
+
+def read_search_path(
+ conf: configparser.SectionProxy) -> Tuple[SearchPath, Optional[Pin]]:
+ mapping: Mapping[str, Tuple[Type[SearchPath], Type[Pin]]] = {
+ 'alias': (AliasSearchPath, AliasPin),
+ 'channel': (ChannelSearchPath, ChannelPin),
+ 'git': (GitSearchPath, GitPin),
}
- return mapping[conf['type']](**dict(conf.items()))
+ 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]
+ return SP(**remaining_fields), pin
def read_config(filename: str) -> configparser.ConfigParser:
if args.channels and section not in args.channels:
continue
- sp = read_search_path(config[section])
+ sp, old_pin = read_search_path(config[section])
- config[section].update(sp.pin(v)._asdict())
+ config[section].update(sp.pin(v, old_pin)._asdict())
with open(args.channels_file, 'w') as configfile:
config.write(configfile)
exprs: Dict[str, str] = {}
config = read_config_files(args.channels_file)
for section in config:
- sp = read_search_path(config[section])
+ sp, pin = read_search_path(config[section])
+ if pin is None:
+ raise Exception(
+ 'Cannot update unpinned channel "%s" (Run "pin" before "update")' %
+ section)
if isinstance(sp, AliasSearchPath):
assert 'git_repo' not in config[section]
continue
- tarball = sp.fetch(v, section, config[section])
+ tarball = sp.fetch(v, pin)
exprs[section] = (
'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' %
(config[section]['release_name'], tarball))
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