-from abc import ABC, abstractmethod
import argparse
import configparser
import filecmp
import shutil
import subprocess
import sys
+import tarfile
import tempfile
import types
import urllib.parse
import xml.dom.minidom
from typing import (
+ Callable,
Dict,
Iterable,
List,
NamedTuple,
NewType,
Optional,
+ Set,
Tuple,
Type,
+ TypeVar,
Union,
)
+import git_cache
+
# Use xdg module when it's less painful to have as a dependency
-class XDG(types.SimpleNamespace):
+class XDG(NamedTuple):
XDG_CACHE_HOME: str
pass
+class SymlinkPin(NamedTuple):
+ @property
+ def release_name(self) -> str:
+ return 'link'
+
+
class GitPin(NamedTuple):
git_revision: str
release_name: str
tarball_sha256: str
-Pin = Union[AliasPin, GitPin, ChannelPin]
+Pin = Union[AliasPin, SymlinkPin, GitPin, ChannelPin]
-class SearchPath(types.SimpleNamespace, ABC):
+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)
- @abstractmethod
- def pin(self, v: Verification) -> Pin:
- pass
+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(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
- git_ref: str
- git_repo: str
- table: Dict[str, ChannelTableEntry]
+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(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
+class GitSearchPath(NamedTuple):
+ git_ref: str
+ git_repo: str
- new_revision = git_fetch(v, self, None, old_revision)
+ 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)
+ 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, 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, None)
- return git_get_tarball(v, self, the_pin)
-
-
-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)
+ def fetch(self, v: Verification, pin: Pin) -> str:
+ assert isinstance(pin, GitPin)
+ git_cache.ensure_rev_available(
+ self.git_repo, self.git_ref, pin.git_revision)
+ return git_get_tarball(v, self, pin)
+
+
+class ChannelSearchPath(NamedTuple):
+ channel_url: str
+ git_ref: str
+ git_repo: str
+
+ def pin(self, v: Verification, old_pin: Optional[Pin]) -> ChannelPin:
+ if old_pin is not None:
+ assert isinstance(old_pin, ChannelPin)
+
+ 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)
+ 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,
- tarball_url=self.table['nixexprs.tar.xz'].absolute_url,
- tarball_sha256=self.table['nixexprs.tar.xz'].digest,
- git_revision=self.git_revision)
+ 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,
+ SymlinkSearchPath,
+ 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().decode()
+ 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.status('Extracting git commit:')
git_commit_node = d.getElementsByTagName('tt')[0]
- channel.git_revision = git_commit_node.firstChild.nodeValue
- v.status(channel.git_revision)
+ git_revision = git_commit_node.firstChild.nodeValue
+ v.status(git_revision)
v.ok()
v.status('Verifying git commit label')
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=channel.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)
-
-
-def git_cachedir(git_repo: str) -> str:
- return os.path.join(
- xdg.XDG_CACHE_HOME,
- 'pinch/git',
- digest_string(git_repo.encode()))
+ v.result(open(table['git-revision'].file).read(999) == pin.git_revision)
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,
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 git_checkout(
v: Verification,
channel: TarrableSearchPath,
+ pin: GitPin,
dest: str) -> None:
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',
- channel.git_revision],
+ pin.git_revision],
stdout=subprocess.PIPE)
tar = subprocess.Popen(
['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
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],
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)
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, git_contents)
+ git_checkout(v, channel, pin, git_contents)
compare_tarball_and_git(v, pin, channel_contents, git_contents)
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',
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 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 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),
}
- 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
+ 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:
if args.channels and section not in args.channels:
continue
- sp = read_search_path(config[section])
+ sp, old_pin = read_config_section(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)
def updateCommand(args: argparse.Namespace) -> None:
v = Verification()
exprs: Dict[str, str] = {}
- 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])
+ 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 nonalias.items():
+ assert not isinstance(sp, AliasSearchPath) # mypy can't see through
+ assert not isinstance(pin, AliasPin) # partition_dict()
+ tarball = sp.fetch(v, pin)
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',
'<nix/unpack-channel.nix>',
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()
projects / pinch / blobdiff