+# pinch: PIN CHannels - a replacement for `nix-channel --update`
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, version 3.
+
+
+import argparse
import configparser
import filecmp
import functools
+import getpass
import hashlib
import operator
import os
import os.path
+import shlex
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,
+ Mapping,
+ NamedTuple,
NewType,
+ Optional,
+ Set,
Tuple,
+ Type,
+ TypeVar,
+ Union,
)
-Digest16 = NewType('Digest16', str)
-Digest32 = NewType('Digest32', str)
+import git_cache
+# Use xdg module when it's less painful to have as a dependency
-class ChannelTableEntry(types.SimpleNamespace):
- absolute_url: str
- digest: Digest16
- file: str
- size: int
- url: str
+class XDG(NamedTuple):
+ XDG_CACHE_HOME: str
-class Channel(types.SimpleNamespace):
- channel_html: bytes
- channel_url: str
- forwarded_url: str
- git_cachedir: str
- git_ref: str
- git_repo: str
- git_revision: str
- old_git_revision: str
- release_name: str
- table: Dict[str, ChannelTableEntry]
+
+xdg = XDG(
+ XDG_CACHE_HOME=os.getenv(
+ 'XDG_CACHE_HOME',
+ os.path.expanduser('~/.cache')))
class VerificationError(Exception):
self.line_length = 0
def status(self, s: str) -> None:
- print(s, end=' ', flush=True)
+ print(s, end=' ', file=sys.stderr, flush=True)
self.line_length += 1 + len(s) # Unicode??
@staticmethod
def _color(s: str, c: int) -> str:
- return '\033[%2dm%s\033[00m' % (c, s)
+ return f'\033[{c:2d}m{s}\033[00m'
def result(self, r: bool) -> None:
message, color = {True: ('OK ', 92), False: ('FAIL', 91)}[r]
length = len(message)
- cols = shutil.get_terminal_size().columns
+ cols = shutil.get_terminal_size().columns or 80
pad = (cols - (self.line_length + length)) % cols
- print(' ' * pad + self._color(message, color))
+ print(' ' * pad + self._color(message, color), file=sys.stderr)
self.line_length = 0
if not r:
raise VerificationError()
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 SymlinkPin(NamedTuple):
+ @property
+ def release_name(self) -> str:
+ return 'link'
+
+
+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, 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):
+ alias_of: str
+
+ def pin(self, _: Verification, __: Optional[Pin]) -> AliasPin:
+ return AliasPin()
+
+
+class SymlinkSearchPath(NamedTuple):
+ path: str
+
+ 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)
+ 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)
+ 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=table['nixexprs.tar.xz'].absolute_url,
+ tarball_sha256=table['nixexprs.tar.xz'].digest,
+ git_revision=new_gitpin.git_revision)
+
+ def fetch(self, v: Verification, pin: Pin) -> str:
+ assert isinstance(pin, ChannelPin)
+
+ return fetch_with_nix_prefetch_url(
+ 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]]:
def throw(error: OSError) -> None:
return filecmp.cmpfiles(a, b, files, shallow=False)
-def fetch(v: Verification, channel: Channel) -> None:
- v.status('Fetching channel')
- request = urllib.request.urlopen(channel.channel_url, timeout=10)
- channel.channel_html = request.read()
- channel.forwarded_url = request.geturl()
- v.result(request.status == 200)
- v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
+def fetch_channel(
+ v: Verification, channel: ChannelSearchPath) -> Tuple[str, str]:
+ v.status(f'Fetching channel from {channel.channel_url}')
+ with urllib.request.urlopen(channel.channel_url, timeout=10) as request:
+ channel_html = request.read().decode()
+ forwarded_url = request.geturl()
+ v.result(request.status == 200)
+ v.check('Got forwarded', channel.channel_url != forwarded_url)
+ return channel_html, forwarded_url
-def parse_channel(v: Verification, channel: Channel) -> None:
+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:')
- title_name = d.getElementsByTagName(
- 'title')[0].firstChild.nodeValue.split()[2]
- h1_name = d.getElementsByTagName('h1')[0].firstChild.nodeValue.split()[2]
- v.status(title_name)
- v.result(title_name == h1_name)
- channel.release_name = title_name
-
- v.status('Extracting git commit:')
+ v.status('Finding release name (1)')
+ title = d.getElementsByTagName('title')[0].firstChild
+ v.result(isinstance(title, xml.dom.minidom.CharacterData))
+ assert isinstance(title, xml.dom.minidom.CharacterData)
+ release_name = title.nodeValue.split()[2]
+ v.status('Finding release name (2)')
+ h1 = d.getElementsByTagName('h1')[0].firstChild
+ v.result(isinstance(h1, xml.dom.minidom.CharacterData))
+ assert isinstance(h1, xml.dom.minidom.CharacterData)
+ v.status('Verifying release name:')
+ v.status(release_name)
+ v.result(release_name == h1.nodeValue.split()[2])
+
+ v.status('Finding git commit')
git_commit_node = d.getElementsByTagName('tt')[0]
- channel.git_revision = git_commit_node.firstChild.nodeValue
- v.status(channel.git_revision)
+ v.result(
+ isinstance(
+ git_commit_node.firstChild,
+ xml.dom.minidom.CharacterData))
+ assert isinstance(
+ git_commit_node.firstChild,
+ xml.dom.minidom.CharacterData)
+ v.status('Extracting git commit:')
+ 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 table, GitPin(release_name=release_name, git_revision=git_revision)
def digest_string(s: bytes) -> 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], capture_output=True)
+ 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], capture_output=True)
+ 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())
v: Verification,
url: str,
digest: Digest16) -> str:
- v.status('Fetching %s' % url)
+ v.status(f'Fetching {url}')
process = subprocess.run(
- ['nix-prefetch-url', '--print-path', url, digest], capture_output=True)
+ ['nix-prefetch-url', '--print-path', url, digest], stdout=subprocess.PIPE)
v.result(process.returncode == 0)
prefetch_digest, path, empty = process.stdout.decode().split('\n')
assert empty == ''
v.check("Verifying nix-prefetch-url's digest",
to_Digest16(v, Digest32(prefetch_digest)) == digest)
- v.status("Verifying file digest")
+ v.status(f"Verifying digest of {path}")
file_digest = digest_file(path)
v.result(file_digest == digest)
- return path
+ return path # type: ignore # (for old mypy)
-def fetch_resources(v: Verification, channel: Channel) -> None:
+def fetch_resources(
+ v: Verification,
+ 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) == channel.git_revision)
-
-
-def git_fetch(v: Verification, channel: Channel) -> 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
- # details for my comfort. So we re-implement here half of nix.fetchGit.
- # :(
-
- # TODO: Consider using pyxdg to find this path.
- channel.git_cachedir = os.path.expanduser(
- '~/.cache/nix-pin-channel/git/%s' %
- digest_string(
- channel.git_repo.encode()))
- if not os.path.exists(channel.git_cachedir):
- v.status("Initializing git repo")
- process = subprocess.run(
- ['git', 'init', '--bare', channel.git_cachedir])
- v.result(process.returncode == 0)
+ with open(table['git-revision'].file, encoding='utf-8') as rev_file:
+ v.result(rev_file.read(999) == pin.git_revision)
- have_rev = False
- if hasattr(channel, 'git_revision'):
- v.status('Checking if we already have this rev:')
- process = subprocess.run(
- ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.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)
- have_rev = process.returncode == 0
-
- if not have_rev:
- 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',
- channel.git_cachedir,
- 'fetch',
- channel.git_repo,
- '%s:%s' % (channel.git_ref,
- channel.git_ref)])
- v.result(process.returncode == 0)
- if hasattr(channel, 'git_revision'):
- v.status('Verifying that fetch retrieved this rev')
- process = subprocess.run(
- ['git', '-C', channel.git_cachedir, 'cat-file', '-e', channel.git_revision])
- v.result(process.returncode == 0)
-
- if not hasattr(channel, 'git_revision'):
- channel.git_revision = open(
- os.path.join(
- channel.git_cachedir,
- 'refs',
- 'heads',
- channel.git_ref)).read(999).strip()
-
- v.status('Verifying rev is an ancestor of ref')
+
+def tarball_cache_file(channel: TarrableSearchPath, pin: GitPin) -> str:
+ return os.path.join(
+ xdg.XDG_CACHE_HOME,
+ 'pinch/git-tarball',
+ f'{digest_string(channel.git_repo.encode())}-{pin.git_revision}-{pin.release_name}')
+
+
+def verify_git_ancestry(
+ v: Verification,
+ channel: TarrableSearchPath,
+ old_revision: str,
+ new_revision: str) -> None:
+ cachedir = git_cache.git_cachedir(channel.git_repo)
+ v.status(f'Verifying rev is an ancestor of previous rev {old_revision}')
process = subprocess.run(['git',
'-C',
- channel.git_cachedir,
+ cachedir,
'merge-base',
'--is-ancestor',
- channel.git_revision,
- channel.git_ref])
+ old_revision,
+ new_revision])
v.result(process.returncode == 0)
+def broken_symlinks_are_identical(root1: str, root2: str, path: str) -> bool:
+ a = os.path.join(root1, path)
+ b = os.path.join(root2, path)
+ return (os.path.islink(a)
+ and os.path.islink(b)
+ and not os.path.exists(a)
+ and not os.path.exists(b)
+ and os.readlink(a) == os.readlink(b))
+
+
def compare_tarball_and_git(
v: Verification,
- channel: Channel,
+ pin: GitPin,
channel_contents: str,
git_contents: str) -> None:
v.status('Comparing channel tarball with git checkout')
- match, mismatch, errors = compare(os.path.join(
- channel_contents, channel.release_name), git_contents)
+ tarball_contents = os.path.join(channel_contents, pin.release_name)
+ match, mismatch, errors = compare(tarball_contents, git_contents)
v.ok()
- v.check('%d files match' % len(match), len(match) > 0)
- v.check('%d files differ' % len(mismatch), len(mismatch) == 0)
+ v.check(f'{len(match)} files match', len(match) > 0)
+ v.check(f'{len(mismatch)} files differ', len(mismatch) == 0)
expected_errors = [
'.git-revision',
'.version-suffix',
'nixpkgs',
'programs.sqlite',
'svn-revision']
- benign_errors = []
+ benign_expected_errors = []
for ee in expected_errors:
if ee in errors:
errors.remove(ee)
- benign_errors.append(ee)
+ benign_expected_errors.append(ee)
+ errors = [
+ e for e in errors
+ if not broken_symlinks_are_identical(tarball_contents, git_contents, e)
+ ]
v.check(
- '%d unexpected incomparable files' %
- len(errors),
+ f'{len(errors)} unexpected incomparable files: {errors}',
len(errors) == 0)
v.check(
- '(%d of %d expected incomparable files)' %
- (len(benign_errors),
- len(expected_errors)),
- len(benign_errors) == len(expected_errors))
-
-
-def extract_tarball(v: Verification, channel: Channel, dest: str) -> None:
- v.status('Extracting tarball %s' %
- channel.table['nixexprs.tar.xz'].file)
- shutil.unpack_archive(
- channel.table['nixexprs.tar.xz'].file,
- dest)
+ f'({len(benign_expected_errors)} of {len(expected_errors)} expected incomparable files)',
+ len(benign_expected_errors) == len(expected_errors))
+
+
+def extract_tarball(
+ v: Verification,
+ table: Dict[str, ChannelTableEntry],
+ dest: str) -> None:
+ v.status(f"Extracting tarball {table['nixexprs.tar.xz'].file}")
+ shutil.unpack_archive(table['nixexprs.tar.xz'].file, dest)
v.ok()
-def git_checkout(v: Verification, channel: Channel, dest: str) -> None:
+def git_checkout(
+ v: Verification,
+ channel: TarrableSearchPath,
+ pin: GitPin,
+ dest: str) -> None:
v.status('Checking out corresponding git revision')
- git = subprocess.Popen(['git',
- '-C',
- channel.git_cachedir,
- 'archive',
- channel.git_revision],
- stdout=subprocess.PIPE)
- tar = subprocess.Popen(
- ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout)
- git.stdout.close()
- tar.wait()
- git.wait()
- v.result(git.returncode == 0 and tar.returncode == 0)
+ with subprocess.Popen(
+ ['git', '-C', git_cache.git_cachedir(channel.git_repo), 'archive', pin.git_revision],
+ stdout=subprocess.PIPE) as git:
+ with subprocess.Popen(['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout) as tar:
+ if git.stdout:
+ git.stdout.close()
+ tar.wait()
+ git.wait()
+ v.result(git.returncode == 0 and tar.returncode == 0)
+
+
+def git_get_tarball(
+ v: Verification,
+ channel: TarrableSearchPath,
+ pin: GitPin) -> str:
+ cache_file = tarball_cache_file(channel, pin)
+ if os.path.exists(cache_file):
+ with open(cache_file, encoding='utf-8') as f:
+ cached_tarball = f.read(9999)
+ if os.path.exists(cached_tarball):
+ return cached_tarball
+
+ with tempfile.TemporaryDirectory() as output_dir:
+ output_filename = os.path.join(
+ output_dir, pin.release_name + '.tar.xz')
+ with open(output_filename, 'w', encoding='utf-8') as output_file:
+ v.status(f'Generating tarball for git revision {pin.git_revision}')
+ with subprocess.Popen(
+ ['git', '-C', git_cache.git_cachedir(channel.git_repo),
+ 'archive', f'--prefix={pin.release_name}/', pin.git_revision],
+ stdout=subprocess.PIPE) as git:
+ with subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file) as xz:
+ xz.wait()
+ git.wait()
+ v.result(git.returncode == 0 and xz.returncode == 0)
+
+ store_tarball = copy_to_nix_store(v, output_filename)
+
+ os.makedirs(os.path.dirname(cache_file), exist_ok=True)
+ with open(cache_file, 'w', encoding='utf-8') as f:
+ f.write(store_tarball)
+ return store_tarball # type: ignore # (for old mypy)
def check_channel_metadata(
v: Verification,
- channel: Channel,
+ pin: GitPin,
channel_contents: str) -> None:
v.status('Verifying git commit in channel tarball')
- v.result(
- open(
- os.path.join(
- channel_contents,
- channel.release_name,
- '.git-revision')).read(999) == channel.git_revision)
+ with open(os.path.join(channel_contents, pin.release_name, '.git-revision'),
+ encoding='utf-8') as f:
+ v.result(f.read(999) == pin.git_revision)
v.status(
- 'Verifying version-suffix is a suffix of release name %s:' %
- channel.release_name)
- version_suffix = open(
- os.path.join(
- channel_contents,
- channel.release_name,
- '.version-suffix')).read(999)
+ f'Verifying version-suffix is a suffix of release name {pin.release_name}:')
+ with open(os.path.join(channel_contents, pin.release_name, '.version-suffix'),
+ encoding='utf-8') as f:
+ version_suffix = f.read(999)
v.status(version_suffix)
- v.result(channel.release_name.endswith(version_suffix))
+ v.result(pin.release_name.endswith(version_suffix))
-def check_channel_contents(v: Verification, channel: Channel) -> None:
+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)
- check_channel_metadata(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, channel, channel_contents, git_contents)
+ compare_tarball_and_git(v, pin, channel_contents, git_contents)
v.status('Removing temporary directories')
v.ok()
-def pin_channel(v: Verification, channel: Channel) -> None:
- fetch(v, channel)
- parse_channel(v, channel)
- fetch_resources(v, channel)
- git_fetch(v, channel)
- check_channel_contents(v, channel)
+def git_revision_name(
+ v: Verification,
+ channel: TarrableSearchPath,
+ git_revision: str) -> str:
+ v.status('Getting commit date')
+ process = subprocess.run(['git',
+ '-C',
+ git_cache.git_cachedir(channel.git_repo),
+ 'log',
+ '-n1',
+ '--format=%ct-%h',
+ '--abbrev=11',
+ '--no-show-signature',
+ git_revision],
+ stdout=subprocess.PIPE)
+ v.result(process.returncode == 0 and process.stdout != b'')
+ return f'{os.path.basename(channel.git_repo)}-{process.stdout.decode().strip()}'
+
+
+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),
+ }
+ 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 RuntimeError(
+ f'Cannot update unpinned channel "{section}" (Run "pin" before "update")')
+ return sp, pin
+
+
+def read_config(filename: str) -> configparser.ConfigParser:
+ config = configparser.ConfigParser()
+ with open(filename, encoding='utf-8') as f:
+ config.read_file(f, filename)
+ return config
-def make_channel(conf: configparser.SectionProxy) -> Channel:
- channel = Channel(**dict(conf.items()))
- if hasattr(channel, 'git_revision'):
- channel.old_git_revision = channel.git_revision
- del channel.git_revision
- return channel
+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 RuntimeError('Duplicate channel "{section}"')
+ merged_config[section] = config[section]
+ return merged_config
-def main(argv: List[str]) -> None:
+def pinCommand(args: argparse.Namespace) -> None:
v = Verification()
- config = configparser.ConfigParser()
- config.read_file(open(argv[1]), argv[1])
+ config = read_config(args.channels_file)
for section in config.sections():
- channel = make_channel(config[section])
- if 'channel_url' in config[section]:
- pin_channel(v, channel)
- 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]['git_revision'] = channel.git_revision
+ if args.channels and section not in args.channels:
+ continue
- with open(argv[1], 'w') as configfile:
+ sp, old_pin = read_config_section(config[section])
+
+ config[section].update(sp.pin(v, old_pin)._asdict())
+
+ with open(args.channels_file, 'w', encoding='utf-8') as configfile:
config.write(configfile)
-main(sys.argv)
+def updateCommand(args: argparse.Namespace) -> None:
+ v = Verification()
+ exprs: Dict[str, str] = {}
+ profile_manifest = os.path.join(args.profile, "manifest.nix")
+ search_paths: List[str] = [
+ "-I", "pinch_profile=" + args.profile,
+ "-I", "pinch_profile_manifest=" + os.readlink(profile_manifest)
+ ] if os.path.exists(profile_manifest) else []
+ 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", f"pinch_tarball_for_{pin.release_name}={tarball}"])
+ exprs[section] = (
+ f'f: f {{ name = "{pin.release_name}"; channelName = "%s"; '
+ f'src = builtins.storePath "{tarball}"; }}')
+
+ for section, (sp, pin) in alias.items():
+ assert isinstance(sp, AliasSearchPath) # For mypy
+ exprs[section] = exprs[sp.alias_of]
+
+ command = [
+ 'nix-env',
+ '--profile',
+ args.profile,
+ '--show-trace',
+ '--file',
+ '<nix/unpack-channel.nix>',
+ '--install',
+ '--remove-all',
+ ] + search_paths + ['--from-expression'] + [
+ exprs[name] % name for name in sorted(exprs.keys())]
+ if args.dry_run:
+ print(' '.join(map(shlex.quote, command)))
+ else:
+ v.status('Installing channels with nix-env')
+ process = subprocess.run(command)
+ v.result(process.returncode == 0)
+
+
+def main() -> None:
+ parser = argparse.ArgumentParser(prog='pinch')
+ subparsers = parser.add_subparsers(dest='mode', required=True)
+ 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=pinCommand)
+ parser_update = subparsers.add_parser('update')
+ parser_update.add_argument('--dry-run', action='store_true')
+ parser_update.add_argument('--profile', default=(
+ f'/nix/var/nix/profiles/per-user/{getpass.getuser()}/channels'))
+ parser_update.add_argument('channels_file', type=str, nargs='+')
+ parser_update.set_defaults(func=updateCommand)
+ args = parser.parse_args()
+ args.func(args)
+
+
+if __name__ == '__main__':
+ main()
projects / pinch / blobdiff