utility scripts for bisection

Author: ifd3f

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "/home/astrid/Documents/nixpkgs";
     flake-utils.url = "github:numtide/flake-utils";
     naersk = {
       url = "github:nix-community/naersk/master";

scripts/bisect.py

@@ -0,0 +1,96 @@
+#!/usr/bin/env python3
+"""
+A quick and dirty script for bisecting nixpkgs to find where we broke
+
+This is not complete and will probably not be, just keeping for reference
+"""
+
+from typing import List
+import math
+import argparse
+import logging
+import subprocess
+import re
+import os
+import shutil
+from pathlib import Path
+
+
+logger = logging.getLogger(__name__)
+
+
+def main():
+    logging.basicConfig(encoding='utf-8', level=logging.DEBUG)
+    args = argparser().parse_args()
+
+    revlist_path: Path = Path(args.revlist)
+    revlist = read_oneline_log(revlist_path)
+    logger.info("Found %d revisions, bisection will take approximately %d steps", revlist, math.log2(len(revlist)))
+
+    repo_dir = Path(__file__).parent.parent
+    logger.info("Changing working directory to repo directory %s", repo_dir)
+    os.chdir(repo_dir)
+
+    logger.info("Initiating bisection")
+    i_bad = 0
+    i_good = len(revlist) - 1
+
+
+
+def argparser():
+    parser = argparse.ArgumentParser(prog='nixpkgs-bisect', description='Bisect nixpkgs')
+    parser.add_argument(
+        "--revlist",
+        required=True,
+        description=(
+            "File containing nixpkgs revision list. Generate this from nixpkgs with this command:\n\n"
+            "git log --oneline $KNOWN_GOOD_REV..master --no-abbrev-commit"
+        )
+    )
+    return parser
+
+
+def read_oneline_log(revlist_path: Path) -> List[str]:
+    with revlist.open() as f:
+        return [
+            l.split()[0]
+            for l in f
+        ]
+
+
+def change_this_repo_nixpkgs_version(flake_url: str):
+    flake_file = Path('flake.nix')
+
+    logger.info("Setting nixpkgs revision in %s to %s", flake_file, flake_url)
+
+    with flakefile.open() as f:
+        lines = list(f)
+    lines[3] = f'nixpkgs.url = "{flake_url}";\n'
+
+    with flakefile.open("w") as f:
+        f.write(''.join(lines))
+
+
+def set_nixpkgs_version():
+    pass
+
+
+def try_build() -> bool:
+    """
+    Try to nix flake update and build. Returns True on success, False otherwise.
+    """
+    
+    cmd = "nix flake update && nix build"
+    logger.info("Executing: %s", cmd)
+    result = subprocess.run(cmd, shell=True)
+    return result.returncode == 0
+
+
+def run_command(cmd: str):
+    logger.debug("Executing shell command: %s", cmd)
+    result = subprocess.run(cmd, shell=True)
+
+
+if __name__ == "__main__":
+    main()
+

scripts/bisect_cmd.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+basedir=$(dirname "$0")
+
+set -euxo pipefail
+
+cd "$basedir"
+
+nix flake update && nix build
+