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generate-flake.nix.py
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generate-flake.nix.py
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#!/usr/bin/env python3
import inspect
import json
import multiprocessing
import pathlib
import shlex
import subprocess
def main():
download_packages = [
"yarn",
"pnpm",
"npm",
]
for package in download_packages:
prefetch_files = []
cmd = shlex.split(
f"devbox run -- deno run -A npm:npm@latest show {package} versions --json",
)
process = subprocess.run(cmd, stdout=subprocess.PIPE)
versions = [
{"package": package, "version": version}
for version in set(json.loads(process.stdout))
]
with multiprocessing.Pool(12) as pool:
for result in pool.imap_unordered(prefetch_npmjs, versions):
prefetch_files.append(result)
pathlib.Path(f"{package}.versions.json").write_text(json.dumps(prefetch_files))
with pathlib.Path("flake.nix").open("w") as f:
f.write(
inspect.cleandoc(
"""
{
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
outputs = {
self,
nixpkgs,
...
} @ inputs: {
""",
),
)
f.write("\n")
read_packages = [
"yarn",
"pnpm",
"npm",
]
for package in read_packages:
for entry in json.loads(
pathlib.Path(f"{package}.versions.json").read_text(encoding="utf8"),
):
package = entry["package"]
version = entry["version"]
nix_version = "_".join(version.split("."))
url = f"https://registry.npmjs.org/{package}/-/{package}-{version}.tgz"
result = entry["result"]
if result is not None:
nixHash = result["hash"]
for system in ["x86_64-linux"]:
string = (
""
f""" packages.{system}.nodePackages.{package}_{nix_version} = nixpkgs.legacyPackages.{system}.fetchurl {'{'}\n"""
f""" url = "{url}";\n"""
f""" hash = "{nixHash}";\n"""
f""" {'}'};\n"""
)
f.write(string)
pkg_string = (
""
f""" packages.{system}.{package}_{nix_version} = derivation {'{'}\n"""
f""" name = "{package}_{nix_version}";\n"""
f""" system = "{system}";\n"""
f""" builder = "${'{'}nixpkgs.legacyPackages.{system}.bash{'}'}/bin/bash";\n"""
f""" args = [ ./npmjs_package_builder.sh ];\n"""
f""" coreutils = nixpkgs.legacyPackages.{system}.coreutils;\n"""
f""" findutils = nixpkgs.legacyPackages.{system}.findutils;\n"""
f""" nodejs = nixpkgs.legacyPackages.{system}.nodejs_20;\n"""
f""" package = self.packages.{system}.nodePackages.{package}_{nix_version};\n"""
f""" {'}'};\n"""
)
f.write(pkg_string)
f.write(
inspect.cleandoc(
"""
};
}
""",
),
)
def prefetch_npmjs(meta):
package = meta["package"]
version = meta["version"]
url = f"https://registry.npmjs.org/{package}/-/{package}-{version}.tgz"
print(url)
cmd = shlex.split(
f'nix --extra-experimental-features "nix-command flakes" store prefetch-file --json "{url}"',
)
process = subprocess.run(cmd, stdout=subprocess.PIPE, encoding="utf8")
try:
result = json.loads(process.stdout)
except json.decoder.JSONDecodeError:
result = None
return {"package": package, "version": version, "result": result}
if __name__ == "__main__":
main()