pyrox.dev
sapling: teach gen-deps.py script to update Cargo.lock
Upstream Sapling does not maintain a Cargo.lock file, so Nixpkgs has its
own. Teach the gen-deps.py script to update Nixpkgs' Cargo.lock whenever
the Cargo.toml files change.
authored by Matthew "strager" Glazar and committed by Austin Seipp 97ebbdef ea6dad32
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pkgs/applications/version-management/sapling/gen-deps.py
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pkgs/applications/version-management/sapling/gen-deps.py
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#!/usr/bin/env nix-shell
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#!nix-shell -i python3 -p "python3.withPackages (ps: with ps; [ requests ])"
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#!nix-shell -i python3 -p cargo -p "python3.withPackages (ps: with ps; [ requests ])"
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import json
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import pathlib
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import re
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import tempfile
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import os
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import shutil
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from hashlib import sha1
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from struct import unpack
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from subprocess import run
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import subprocess
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from requests import get
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# Fetch the latest stable release metadata from GitHub
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latestTag = get("https://api.github.com/repos/facebook/sapling/releases/latest").json()[
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"tag_name"
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]
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releaseMetadata = get("https://api.github.com/repos/facebook/sapling/releases/latest").json()
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latestTag = releaseMetadata["tag_name"]
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latestTarballURL = releaseMetadata["tarball_url"]
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[_tarballHash, sourceDirectory] = run(
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["nix-prefetch-url", "--print-path", "--unpack", latestTarballURL],
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check=True,
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text=True,
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stdout=subprocess.PIPE,
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).stdout.rstrip().splitlines()
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def updateCargoLock():
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with tempfile.TemporaryDirectory() as tempDir:
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tempDir = pathlib.Path(tempDir)
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# NOTE(strager): We cannot use shutil.tree because it copies the
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# read-only permissions.
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for dirpath, dirnames, filenames in os.walk(sourceDirectory):
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relativeDirpath = os.path.relpath(dirpath, sourceDirectory)
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for filename in filenames:
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shutil.copy(os.path.join(dirpath, filename), tempDir / relativeDirpath / filename)
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for dirname in dirnames:
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os.mkdir(tempDir / relativeDirpath / dirname)
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run(["cargo", "fetch"], check=True, cwd=tempDir / "eden" / "scm")
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shutil.copy(tempDir / "eden" / "scm" / "Cargo.lock", "Cargo.lock")
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updateCargoLock()
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def nixPrefetchUrl(url):
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return run(
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# Fetch the `setup.py` source and look for instances of assets being downloaded
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# from files.pythonhosted.org.
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setupPy = get(
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f"https://github.com/facebook/sapling/raw/{latestTag}/eden/scm/setup.py"
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).text
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setupPy = (pathlib.Path(sourceDirectory) / "eden/scm/setup.py").read_text()
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foundUrls = re.findall(r'(https://files\.pythonhosted\.org/packages/[^\s]+)"', setupPy)
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dataDeps = {