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Analysis of src/bernstein/cli/commands/gate_cmd.py for Worktree Compatibility

Overview

The bernstein gate verify command verifies signed adjudication records for phase-gate boundaries. It recomputes inputs_hash from claimed inputs and confirms the panel saw exactly those inputs, then verifies the record is anchored in a verified lineage spine.

Key Functions

_lineage_root(workdir: Path) -> Path

def _lineage_root(workdir: Path) -> Path:
    return workdir / ".sdd" / "lineage"

Returns the path to the lineage directory under the given workdir.

gate_verify_cmd(run_id: str, inputs_file: str, workdir: str) -> None

Main command implementation:

  1. root = Path(workdir).resolve() - converts workdir to absolute path
  2. lineage_root = _lineage_root(root) - gets lineage dir under resolved workdir
  3. claimed = json.loads(Path(inputs_file).read_text(encoding="utf-8")) - reads claimed inputs
  4. Reads adjudication records from lineage root
  5. Verifies each record against claimed inputs

Worktree Analysis

Path Handling

  • The workdir parameter (from --workdir option, default ".") is resolved to an absolute path using .resolve()
  • All lineage-related paths are derived from this resolved workdir path
  • The inputs file path is used as provided (but validated to exist by click.Path)

Worktree Safety Assessment

✅ Worktree-safe: The command correctly handles worktree scenarios because:

  1. It uses the provided workdir parameter (not a hardcoded path)
  2. It resolves workdir to absolute path before deriving other paths
  3. Lineage root is correctly located at {workdir}/.sdd/lineage
  4. No hardcoded paths point to the main project location

Example Usage in Worktree

From within worktree at /work/proj/.sdd/worktrees/backend-072bd1f9:

# Correct - uses worktree's lineage
bernstein gate verify <run> --inputs inputs.json --workdir .

# Also correct - explicit worktree path
bernstein gate verify <run> --inputs inputs.json --workdir /work/proj/.sdd/worktrees/backend-072bd1f9

# Correct but different - uses main project's lineage  
bernstein gate verify <run> --inputs inputs.json --workdir /work/proj

Tests Review

Unit tests in tests/unit/cli/test_gate_cmd.py show proper usage:

  • Both inputs_file and workdir are passed as paths relative to tmp_path (test worktree root)
  • Command correctly locates records in {workdir}/.sdd/lineage
  • No test failures indicating path resolution issues

Conclusion

The gate command implementation does not contain path resolution logic that would incorrectly look up fixture files at /work/proj/ instead of the worktree root. It properly uses the provided workdir parameter to locate all relevant files and directories, making it compatible with git worktrees when used with appropriate --workdir values.