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#!/usr/bin/env python3

from __future__ import annotations

import argparse

import gzip

import os.path

import shutil

import subprocess

import tarfile

import tempfile

from typing import Sequence

# This is a script for generating the tarred resources for git repo

# dependencies. Currently it's just for "vendoring" ruby support packages.

REPOS = (

('rbenv', 'https://github.com/rbenv/rbenv', '38e1fbb'),

('ruby-build', 'https://github.com/rbenv/ruby-build', '855b963'),

(

'ruby-download',

'https://github.com/garnieretienne/rvm-download',

'09bd7c6',

)

def reset(tarinfo: tarfile.TarInfo) -> tarfile.TarInfo:

tarinfo.uid = tarinfo.gid = 0

tarinfo.uname = tarinfo.gname = 'root'

tarinfo.mtime = 0

return tarinfo

def make_archive(name: str, repo: str, ref: str, destdir: str) -> str:

output_path = os.path.join(destdir, f'{name}.tar.gz')

with tempfile.TemporaryDirectory() as tmpdir:

# this ensures that the root directory has umask permissions

gitdir = os.path.join(tmpdir, 'root')

# Clone the repository to the temporary directory

subprocess.check_call(('git', 'clone', repo, gitdir))

subprocess.check_call(('git', '-C', gitdir, 'checkout', ref))

# We don't want the '.git' directory

# It adds a bunch of size to the archive and we don't use it at

# runtime

shutil.rmtree(os.path.join(gitdir, '.git'))

arcs = [(name, gitdir)]

for root, dirs, filenames in os.walk(gitdir):

for filename in dirs + filenames:

abspath = os.path.abspath(os.path.join(root, filename))

relpath = os.path.relpath(abspath, gitdir)

arcs.append((os.path.join(name, relpath), abspath))

arcs.sort()

with gzip.GzipFile(output_path, 'wb', mtime=0) as gzipf:

# https://github.com/python/typeshed/issues/5491

with tarfile.open(fileobj=gzipf, mode='w') as tf: # type: ignore

for arcname, abspath in arcs:

tf.add(

abspath,

arcname=arcname,

recursive=False,

filter=reset,

)

return output_path

def main(argv: Sequence[str] | None = None) -> int:

parser = argparse.ArgumentParser()

parser.add_argument('--dest', default='pre_commit/resources')

args = parser.parse_args(argv)

for archive_name, repo, ref in REPOS:

print(f'Making {archive_name}.tar.gz for {repo}@{ref}')

make_archive(archive_name, repo, ref, args.dest)

return 0

if __name__ == '__main__':

raise SystemExit(main())

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