X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/17d42dd500b06196b70af99e05e9d0fffaf3f38e..971d3659a4f2ba4e3daeba142668809529ff65c1:/pinch.py diff --git a/pinch.py b/pinch.py index b3f65c6..0f8f00a 100644 --- a/pinch.py +++ b/pinch.py @@ -1,3 +1,4 @@ +import argparse import configparser import filecmp import functools @@ -7,7 +8,6 @@ import os import os.path import shutil import subprocess -import sys import tempfile import types import urllib.parse @@ -38,7 +38,6 @@ 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 @@ -212,68 +211,20 @@ def fetch_resources(v: Verification, channel: Channel) -> None: 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. - # :( - +def git_cachedir(git_repo: str) -> str: # TODO: Consider using pyxdg to find this path. - channel.git_cachedir = os.path.expanduser( + return 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) + git_repo.encode())) - 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() +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', - channel.git_cachedir, + cachedir, 'merge-base', '--is-ancestor', channel.git_revision, @@ -286,7 +237,7 @@ def git_fetch(v: Verification, channel: Channel) -> None: channel.old_git_revision) process = subprocess.run(['git', '-C', - channel.git_cachedir, + cachedir, 'merge-base', '--is-ancestor', channel.old_git_revision, @@ -294,6 +245,65 @@ def git_fetch(v: Verification, channel: Channel) -> None: 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 + # 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)]) + v.result(process.returncode == 0) + + if hasattr(channel, 'git_revision'): + v.status('Verifying that fetch retrieved this rev') + process = subprocess.run( + ['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) + + +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: Verification, channel: Channel, @@ -340,7 +350,7 @@ def git_checkout(v: Verification, channel: Channel, dest: str) -> None: 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) @@ -395,10 +405,26 @@ 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) +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 make_channel(conf: configparser.SectionProxy) -> Channel: channel = Channel(**dict(conf.items())) if hasattr(channel, 'git_revision'): @@ -407,22 +433,34 @@ def make_channel(conf: configparser.SectionProxy) -> Channel: return channel -def main(argv: List[str]) -> None: +def pin(args: argparse.Namespace) -> None: v = Verification() config = configparser.ConfigParser() - config.read_file(open(argv[1]), argv[1]) + config.read_file(open(args.channels_file), 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]['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]['name'] = git_revision_name(v, channel) config[section]['git_revision'] = channel.git_revision - with open(argv[1], 'w') as configfile: + with open(args.channels_file, 'w') as configfile: config.write(configfile) -main(sys.argv) +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) + args = parser.parse_args() + args.func(args) + + +main()