+import argparse
import configparser
import filecmp
import functools
+import getpass
import hashlib
import operator
import os
import os.path
import shutil
import subprocess
-import sys
import tempfile
import types
import urllib.parse
class ChannelTableEntry(types.SimpleNamespace):
+ absolute_url: str
digest: Digest16
file: str
size: int
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]
- url: str
class VerificationError(Exception):
def fetch(v: Verification, channel: Channel) -> None:
v.status('Fetching channel')
- request = urllib.request.urlopen(channel.url, timeout=10)
+ 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.url != channel.forwarded_url)
+ v.check('Got forwarded', channel.channel_url != channel.forwarded_url)
def parse_channel(v: Verification, channel: Channel) -> None:
def fetch_resources(v: Verification, channel: Channel) -> None:
for resource in ['git-revision', 'nixexprs.tar.xz']:
fields = channel.table[resource]
- url = urllib.parse.urljoin(channel.forwarded_url, fields.url)
- fields.file = fetch_with_nix_prefetch_url(v, url, fields.digest)
+ fields.absolute_url = urllib.parse.urljoin(
+ channel.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_cachedir(git_repo: str) -> str:
+ # TODO: Consider using pyxdg to find this path.
+ return os.path.expanduser(
+ '~/.cache/nix-pin-channel/git/%s' %
+ digest_string(
+ git_repo.encode()))
+
+
+def verify_git_ancestry(v: Verification, channel: Channel) -> None:
+ cachedir = git_cachedir(channel.git_repo)
+ v.status('Verifying rev is an ancestor of ref')
+ process = subprocess.run(['git',
+ '-C',
+ cachedir,
+ 'merge-base',
+ '--is-ancestor',
+ channel.git_revision,
+ channel.git_ref])
+ v.result(process.returncode == 0)
+
+ if hasattr(channel, 'old_git_revision'):
+ v.status(
+ 'Verifying rev is an ancestor of previous rev %s' %
+ channel.old_git_revision)
+ process = subprocess.run(['git',
+ '-C',
+ cachedir,
+ 'merge-base',
+ '--is-ancestor',
+ channel.old_git_revision,
+ channel.git_revision])
+ v.result(process.returncode == 0)
+
+
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
# 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.url.encode()))
- if not os.path.exists(channel.git_cachedir):
+ cachedir = git_cachedir(channel.git_repo)
+ if not os.path.exists(cachedir):
v.status("Initializing git repo")
process = subprocess.run(
- ['git', 'init', '--bare', channel.git_cachedir])
+ ['git', 'init', '--bare', cachedir])
v.result(process.returncode == 0)
- 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)
- if process.returncode == 1:
- v.status('Fetching ref "%s"' % channel.git_ref)
- # 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)
+ 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)])
+ 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])
+ ['git', '-C', cachedir, 'cat-file', '-e', channel.git_revision])
v.result(process.returncode == 0)
+ else:
+ channel.git_revision = open(
+ os.path.join(
+ cachedir,
+ 'refs',
+ 'heads',
+ channel.git_ref)).read(999).strip()
+
+ verify_git_ancestry(v, channel)
- v.status('Verifying rev is an ancestor of ref')
- process = subprocess.run(['git',
- '-C',
- channel.git_cachedir,
- 'merge-base',
- '--is-ancestor',
- channel.git_revision,
- channel.git_ref])
- v.result(process.returncode == 0)
+
+def ensure_git_rev_available(v: Verification, channel: Channel) -> 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])
+ 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)
+ return
+ git_fetch(v, channel)
def compare_tarball_and_git(
v.status('Checking out corresponding git revision')
git = subprocess.Popen(['git',
'-C',
- channel.git_cachedir,
+ git_cachedir(channel.git_repo),
'archive',
channel.git_revision],
stdout=subprocess.PIPE)
v.result(git.returncode == 0 and tar.returncode == 0)
+def git_get_tarball(v: Verification, channel: Channel) -> str:
+ with tempfile.TemporaryDirectory() as output_dir:
+ output_filename = os.path.join(
+ output_dir, channel.release_name + '.tar.xz')
+ with open(output_filename, 'w') as output_file:
+ v.status(
+ 'Generating tarball for git revision %s' %
+ channel.git_revision)
+ git = subprocess.Popen(['git',
+ '-C',
+ git_cachedir(channel.git_repo),
+ 'archive',
+ '--prefix=%s/' % channel.release_name,
+ channel.git_revision],
+ stdout=subprocess.PIPE)
+ xz = subprocess.Popen(['xz'], stdin=git.stdout, stdout=output_file)
+ xz.wait()
+ 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], capture_output=True)
+ v.result(process.returncode == 0)
+ return process.stdout.decode().strip()
+
+
def check_channel_metadata(
v: Verification,
channel: Channel,
v.ok()
-def main(argv: List[str]) -> None:
- v = Verification()
- config = configparser.ConfigParser()
- config.read_file(open(argv[1]), argv[1])
- channel = Channel(**dict(config['nixos'].items()))
+def pin_channel(v: Verification, channel: Channel) -> None:
fetch(v, channel)
parse_channel(v, channel)
fetch_resources(v, channel)
- git_fetch(v, channel)
+ ensure_git_rev_available(v, channel)
check_channel_contents(v, channel)
- print(channel)
-main(sys.argv)
+def git_revision_name(v: Verification, channel: Channel) -> str:
+ v.status('Getting commit date')
+ process = subprocess.run(['git',
+ '-C',
+ git_cachedir(channel.git_repo),
+ 'lo',
+ '-n1',
+ '--format=%ct-%h',
+ '--abbrev=11',
+ channel.git_revision],
+ capture_output=True)
+ v.result(process.returncode == 0 and process.stdout != '')
+ return '%s-%s' % (os.path.basename(channel.git_repo),
+ process.stdout.decode().strip())
+
+
+def pin(args: argparse.Namespace) -> None:
+ v = Verification()
+ config = configparser.ConfigParser()
+ config.read_file(open(args.channels_file), args.channels_file)
+ for section in config.sections():
+
+ channel = Channel(**dict(config[section].items()))
+ if hasattr(channel, 'git_revision'):
+ channel.old_git_revision = channel.git_revision
+ del channel.git_revision
+
+ 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
+
+ with open(args.channels_file, 'w') as configfile:
+ config.write(configfile)
+
+
+def update(args: argparse.Namespace) -> None:
+ v = Verification()
+ config = configparser.ConfigParser()
+ config.read_file(open(args.channels_file), args.channels_file)
+ exprs = []
+ for section in config.sections():
+ if 'channel_url' in config[section]:
+ tarball = fetch_with_nix_prefetch_url(
+ v, config[section]['tarball_url'], Digest16(
+ config[section]['tarball_sha256']))
+ else:
+ channel = Channel(**dict(config[section].items()))
+ ensure_git_rev_available(v, channel)
+ tarball = git_get_tarball(v, channel)
+ exprs.append(
+ 'f: f { name = "%s"; channelName = "%s"; src = builtins.storePath "%s"; }' %
+ (config[section]['release_name'], section, tarball))
+ v.status('Installing channels with nix-env')
+ process = subprocess.run(
+ [
+ 'nix-env',
+ '--profile',
+ '/nix/var/nix/profiles/per-user/%s/channels' %
+ getpass.getuser(),
+ '--show-trace',
+ '--file',
+ '<nix/unpack-channel.nix>',
+ '--install',
+ '--from-expression'] +
+ exprs)
+ 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.set_defaults(func=pin)
+ parser_update = subparsers.add_parser('update')
+ parser_update.add_argument('channels_file', type=str)
+ parser_update.set_defaults(func=update)
+ args = parser.parse_args()
+ args.func(args)
+
+
+main()
projects / pinch / blobdiff