feat: add initial mantainers/script/update.py

maintainers/scripts/update.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i python3 -p "python311.withPackages (ps: with ps; [ click ])"
+
+import json
+import os
+import subprocess
+
+import click
+
+
+def get_nixpkgs_path(path):
+    result = subprocess.run(
+        ["nix", "eval", "-f", path, "inputs.nixpkgs.outPath", "--json"],
+        capture_output=True,
+        text=True,
+    )
+    result.check_returncode()
+    return json.loads(result.stdout)
+
+
+def resolve_nixpkgs(nixpkgs, path):
+    return nixpkgs if nixpkgs else get_nixpkgs_path(path)
+
+
+def build_nix_args(update_nix, path, attr_path, commit):
+    args = [
+        update_nix,
+        "--arg",
+        "include-overlays",
+        f"[(import {path}).overlays.default]",
+        "--argstr",
+        "path",
+        attr_path,
+    ]
+    if commit:
+        args.append("--argstr", "commit", "true")
+    return args
+
+
+@click.command()
+@click.option("--commit", is_flag=True, help="Commit the changes")
+@click.option(
+    "--nixpkgs",
+    help="Override the nixpkgs flake input with this path, it will be used for finding update.nix",
+    default=None,
+)
+@click.argument("attr_path")
+def main(commit, nixpkgs, attr_path):
+    path = os.getcwd()
+    nixpkgs_path = resolve_nixpkgs(nixpkgs, path)
+    update_nix_bin = os.path.join(nixpkgs_path, "maintainers/scripts/update.nix")
+    nix_args = build_nix_args(update_nix_bin, path, attr_path, commit)
+    os.execvp("nix-shell", ["nix-shell"] + nix_args)
+
+
+if __name__ == "__main__":
+    main()