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#!/usr/bin/env python3
import base64
import json
import os
import subprocess
import re
import random
import sys
import tempfile
import logging
import click
import click_log
from typing import Optional
from urllib.request import urlopen
from joblib import Parallel, delayed, Memory
from platformdirs import user_cache_dir
sys.path.append("@depot_tools_checkout@")
import gclient_eval
import gclient_utils
logger = logging.getLogger(__name__)
click_log.basic_config(logger)
nixpkgs_path = "<nixpkgs>"
memory: Memory = Memory(user_cache_dir("gclient2nix"), verbose=0)
def cache(mem, **mem_kwargs):
def cache_(f):
f.__module__ = "gclient2nix"
f.__qualname__ = f.__name__
return mem.cache(f, **mem_kwargs)
return cache_
@cache(memory)
def get_repo_hash(fetcher: str, args: dict) -> str:
expr = f"(import {nixpkgs_path} {{}}).gclient2nix.fetchers.{fetcher}{{"
for key, val in args.items():
expr += f'{key}="{val}";'
expr += "}"
cmd = ["nurl", "-H", "--expr", expr]
print(" ".join(cmd), file=sys.stderr)
out = subprocess.check_output(cmd)
return out.decode("utf-8").strip()
class Repo:
fetcher: str
args: dict
def __init__(self) -> None:
self.deps: dict = {}
def get_deps(self, repo_vars: dict, path: str) -> None:
print(
"evaluating " + json.dumps(self, default=vars, sort_keys=True),
file=sys.stderr,
)
deps_file = self.get_file("DEPS")
evaluated = gclient_eval.Parse(
deps_file,
filename="DEPS",
vars_override=repo_vars,
# KeyError: "host_cpu was used as a variable, but was not declared in the vars dict (file 'DEPS', line 114)"
# https://chromium.googlesource.com/webpagereplay.git/+/b2b856131e36c99e9de9c419fe8ca02f857082ba/DEPS#114
builtin_vars= {"host_cpu": "*host_cpu_placeholder*"} if path == "src/third_party/webpagereplay" else None,
)
repo_vars = dict(evaluated.get("vars", {})) | repo_vars
prefix = f"{path}/" if evaluated.get("use_relative_paths", False) else ""
self.deps = {
prefix + dep_name: repo_from_dep(dep)
for dep_name, dep in evaluated.get("deps", {}).items()
if (
gclient_eval.EvaluateCondition(dep["condition"], repo_vars)
if "condition" in dep
else True
)
and repo_from_dep(dep) != None
}
for key in evaluated.get("recursedeps", []):
dep_path = prefix + key
if dep_path in self.deps:
self.deps[dep_path].get_deps(repo_vars, dep_path)
def eval(self) -> None:
self.get_deps(
{
**{
f"checkout_{platform}": platform == "linux"
for platform in ["ios", "chromeos", "android", "mac", "win", "linux", "fuchsia"]
},
**{
f"checkout_{arch}": True
for arch in ["x64", "arm64", "arm", "x86", "mips", "mips64", "ppc", "riscv64", "s390"]
},
},
"",
)
def prefetch(self) -> None:
self.hash = get_repo_hash(self.fetcher, self.args)
def prefetch_all(self) -> int:
return sum(
[dep.prefetch_all() for [_, dep] in self.deps.items()],
[delayed(self.prefetch)()],
)
def flatten_repr(self) -> dict:
return {"fetcher": self.fetcher, "args": {**({"hash": self.hash} if hasattr(self, "hash") else {}), **self.args}}
def flatten(self, path: str) -> dict:
out = {path: self.flatten_repr()}
for dep_path, dep in self.deps.items():
out |= dep.flatten(dep_path)
return out
def get_file(self, filepath: str) -> str:
raise NotImplementedError
class GitRepo(Repo):
def __init__(self, url: str, rev: str) -> None:
super().__init__()
self.fetcher = "fetchgit"
self.args = {
"url": url,
"rev" if re.match(r"[0-9a-f]{40}", rev) else "tag": rev,
}
class GitHubRepo(Repo):
def __init__(self, owner: str, repo: str, rev: str) -> None:
super().__init__()
self.fetcher = "fetchFromGitHub"
self.args = {
"owner": owner,
"repo": repo,
"rev" if re.match(r"[0-9a-f]{40}", rev) else "tag": rev,
}
def get_file(self, filepath: str) -> str:
rev_or_tag = self.args['rev'] if 'rev' in self.args else f"refs/tags/{self.args['tag']}"
return (
urlopen(
f"https://raw.githubusercontent.com/{self.args['owner']}/{self.args['repo']}/{rev_or_tag}/{filepath}"
)
.read()
.decode("utf-8")
)
class GitilesRepo(Repo):
def __init__(self, url: str, rev: str) -> None:
super().__init__()
self.fetcher = "fetchFromGitiles"
self.args = {
"url": url,
"rev" if re.match(r"[0-9a-f]{40}", rev) else "tag": rev,
}
# Quirk: Chromium source code exceeds the Hydra output limit
# We prefer deleting test data over recompressing the sources into a
# tarball, because the NAR will be compressed after the size check
# anyways, so recompressing is more like bypassing the size limit
# (making it count the compressed instead of uncompressed size)
# rather than complying with it.
if url == "https://chromium.googlesource.com/chromium/src.git":
self.args["postFetch"] = "rm -rf $(find $out/third_party/blink/web_tests ! -name BUILD.gn -mindepth 1 -maxdepth 1); "
self.args["postFetch"] += "rm -r $out/content/test/data; "
self.args["postFetch"] += "rm -rf $out/courgette/testdata; "
self.args["postFetch"] += "rm -r $out/extensions/test/data; "
self.args["postFetch"] += "rm -r $out/media/test/data; "
def get_file(self, filepath: str) -> str:
rev_or_tag = self.args['rev'] if 'rev' in self.args else f"refs/tags/{self.args['tag']}"
return base64.b64decode(
urlopen(
f"{self.args['url']}/+/{rev_or_tag}/{filepath}?format=TEXT"
).read()
).decode("utf-8")
def repo_from_dep(dep: dict) -> Optional[Repo]:
if "url" in dep:
url, rev = gclient_utils.SplitUrlRevision(dep["url"])
search_object = re.search(r"https://github.com/(.+)/(.+?)(\.git)?$", url)
if search_object:
return GitHubRepo(search_object.group(1), search_object.group(2), rev)
if re.match(r"https://.+\.googlesource.com", url):
return GitilesRepo(url, rev)
return GitRepo(url, rev)
else:
# Not a git dependency; skip
return None
@click.group()
def cli() -> None:
"""gclient2nix"""
pass
@cli.command("eval", help="Evaluate and print the dependency tree of a gclient project")
@click.argument("url", required=True, type=str)
@click.option("--root", default="src", help="Root path, where the given url is placed", type=str)
def eval(url: str, root: str) -> None:
repo = repo_from_dep({"url": url})
repo.eval()
print(json.dumps(repo.flatten(root), sort_keys=True, indent=4))
@cli.command("generate", help="Generate a dependencies description for a gclient project")
@click.argument("url", required=True, type=str)
@click.option("--root", default="src", help="Root path, where the given url is placed", type=str)
def generate(url: str, root: str) -> None:
repo = repo_from_dep({"url": url})
repo.eval()
tasks = repo.prefetch_all()
random.shuffle(tasks)
task_results = {
n[0]: n[1]
for n in Parallel(n_jobs=20, require="sharedmem", return_as="generator")(tasks)
if n != None
}
print(json.dumps(repo.flatten(root), sort_keys=True, indent=4))
if __name__ == "__main__":
cli()
|
