X-Git-Url: http://git.scottworley.com/pinch/blobdiff_plain/01ba0eb2f8683ddb6f892c7adc98626cdba0d236..b365b52416a5c3d79b96ca9401b5031db4bddba2:/pinch.py?ds=inline diff --git a/pinch.py b/pinch.py index b044faf..5f25015 100644 --- a/pinch.py +++ b/pinch.py @@ -25,6 +25,19 @@ from typing import ( Tuple, ) +# Use xdg module when it's less painful to have as a dependency + + +class XDG(types.SimpleNamespace): + XDG_CACHE_HOME: str + + +xdg = XDG( + XDG_CACHE_HOME=os.getenv( + 'XDG_CACHE_HOME', + os.path.expanduser('~/.cache'))) + + Digest16 = NewType('Digest16', str) Digest32 = NewType('Digest32', str) @@ -70,7 +83,7 @@ class Verification: 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), file=sys.stderr) self.line_length = 0 @@ -171,7 +184,7 @@ def digest_file(filename: str) -> Digest16: 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) + ['nix', 'to-base16', '--type', 'sha256', digest32], stdout=subprocess.PIPE) v.result(process.returncode == 0) return Digest16(process.stdout.decode().strip()) @@ -179,7 +192,7 @@ def to_Digest16(v: Verification, digest32: Digest32) -> Digest16: 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) + ['nix', 'to-base32', '--type', 'sha256', digest16], stdout=subprocess.PIPE) v.result(process.returncode == 0) return Digest32(process.stdout.decode().strip()) @@ -190,7 +203,7 @@ def fetch_with_nix_prefetch_url( digest: Digest16) -> str: v.status('Fetching %s' % 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 == '' @@ -216,11 +229,20 @@ def fetch_resources(v: Verification, channel: Channel) -> None: def git_cachedir(git_repo: str) -> str: - # TODO: Consider using pyxdg to find this path. - return os.path.expanduser( - '~/.cache/pinch/git/%s' % - digest_string( - git_repo.encode())) + return os.path.join( + xdg.XDG_CACHE_HOME, + 'pinch/git', + digest_string(git_repo.encode())) + + +def tarball_cache_file(channel: Channel) -> str: + return os.path.join( + xdg.XDG_CACHE_HOME, + 'pinch/git-tarball', + '%s-%s-%s' % + (digest_string(channel.git_repo.encode()), + channel.git_revision, + channel.release_name)) def verify_git_ancestry(v: Verification, channel: Channel) -> None: @@ -360,13 +382,20 @@ def git_checkout(v: Verification, channel: Channel, dest: str) -> None: stdout=subprocess.PIPE) tar = subprocess.Popen( ['tar', 'x', '-C', dest, '-f', '-'], stdin=git.stdout) - git.stdout.close() + 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: Channel) -> str: + cache_file = tarball_cache_file(channel) + if os.path.exists(cache_file): + cached_tarball = open(cache_file).read(9999) + if os.path.exists(cached_tarball): + return cached_tarball + with tempfile.TemporaryDirectory() as output_dir: output_filename = os.path.join( output_dir, channel.release_name + '.tar.xz') @@ -388,9 +417,13 @@ def git_get_tarball(v: Verification, channel: Channel) -> str: v.status('Putting tarball in Nix store') process = subprocess.run( - ['nix-store', '--add', output_filename], capture_output=True) + ['nix-store', '--add', output_filename], stdout=subprocess.PIPE) v.result(process.returncode == 0) - return process.stdout.decode().strip() + store_tarball = process.stdout.decode().strip() + + os.makedirs(os.path.dirname(cache_file), exist_ok=True) + open(cache_file, 'w').write(store_tarball) + return store_tarball def check_channel_metadata( @@ -445,13 +478,13 @@ def git_revision_name(v: Verification, channel: Channel) -> str: process = subprocess.run(['git', '-C', git_cachedir(channel.git_repo), - 'lo', + 'log', '-n1', '--format=%ct-%h', '--abbrev=11', channel.git_revision], - capture_output=True) - v.result(process.returncode == 0 and process.stdout != '') + stdout=subprocess.PIPE) + v.result(process.returncode == 0 and process.stdout != b'') return '%s-%s' % (os.path.basename(channel.git_repo), process.stdout.decode().strip()) @@ -493,27 +526,38 @@ def pin(args: argparse.Namespace) -> None: config.write(configfile) +def fetch_channel( + 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) + + if 'channel_url' in conf: + return fetch_with_nix_prefetch_url( + v, conf['tarball_url'], Digest16( + conf['tarball_sha256'])) + + channel = Channel(**dict(conf.items())) + ensure_git_rev_available(v, channel) + return git_get_tarball(v, channel) + + def update(args: argparse.Namespace) -> None: v = Verification() config = configparser.ConfigParser() - exprs = {} + exprs: Dict[str, str] = {} configs = [read_config(filename) for filename in args.channels_file] for config in configs: for section in config.sections(): - if 'alias_of' in config[section]: assert 'git_repo' not in config[section] continue - - 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) - + tarball = fetch_channel(v, section, config[section]) + if section in exprs: + raise Exception('Duplicate channel "%s"' % section) exprs[section] = ( 'f: f { name = "%s"; channelName = "%%s"; src = builtins.storePath "%s"; }' % (config[section]['release_name'], tarball)) @@ -521,6 +565,8 @@ def update(args: argparse.Namespace) -> None: for config in configs: for section in config.sections(): if 'alias_of' in config[section]: + if section in exprs: + raise Exception('Duplicate channel "%s"' % section) exprs[section] = exprs[str(config[section]['alias_of'])] command = [ @@ -556,4 +602,5 @@ def main() -> None: args.func(args) -main() +if __name__ == '__main__': + main()