langflow-ai/langflow · error · SystemExit

Could not strip ruff per-file-ignore entry for {ri.pattern!r

Error message

Could not strip ruff per-file-ignore entry for {ri.pattern!r}; the regex may not match the current layout.  Edit by hand.

What it means

As part of porting, port_bundle.py removes the ported provider's per-file-ignore entry (a quoted glob followed by '= [ ... ]') from the ruff config in the root pyproject.toml, using a regex with re.MULTILINE|re.DOTALL. If the substitution changes nothing — the entry's formatting no longer matches the expected 'pattern" = [ ... ]\n' layout — the script refuses to write an unmodified file and tells you to edit by hand, because silently continuing would leave stale lint ignores.

Source

Thrown at scripts/migrate/port_bundle.py:1113

        return actions
    text = ROOT_PYPROJECT.read_text(encoding="utf-8")
    for ri in plan.ruff_ignores:
        # Remove the entire entry block (``"<pattern>" = [...]\n``);
        # the block may span multiple lines so we anchor on the
        # pattern line and consume up to the closing ``]\n``.
        # The bracketed body may contain newlines, so use re.DOTALL.
        block = re.compile(
            r'^"' + re.escape(ri.pattern) + r'"\s*=\s*\[[^\]]*\]\n',
            re.MULTILINE | re.DOTALL,
        )
        new_text = block.sub("", text, count=1)
        if new_text == text:
            msg = (
                f"Could not strip ruff per-file-ignore entry for "
                f"{ri.pattern!r}; the regex may not match the current "
                "layout.  Edit by hand."
            )
            raise SystemExit(msg)
        text = new_text
    ROOT_PYPROJECT.write_text(text, encoding="utf-8")
    return actions


# ---------------------------------------------------------------------------
# Phase C: workspace + external consumers
# ---------------------------------------------------------------------------


def _insert_before_marker(text: str, end_marker: str, payload: str, *, what: str) -> str:
    needle = end_marker
    idx = text.find(needle)
    if idx == -1:
        msg = (
            f"Could not locate the {what} end marker ({needle!r}) in "
            "pyproject.toml.  Re-add the ``langflow-extensions:bundle-*`` "
            "marker pair before re-running -- see src/bundles/PORTING.md."

View on GitHub (pinned to 976ec789d2)

Solutions

1. Open pyproject.toml, find the per-file-ignores entry matching the pattern quoted in the error, and delete that entry (the whole quoted-key = [ ... ] block) manually.
2. Then re-run port_bundle.py --apply; the strip step becomes a no-op once the entry is gone.
3. Keep per-file-ignore bodies free of inline comments and exotic formatting so the mechanical strip keeps working.

Example fix

# before (pyproject.toml)
[tool.ruff.lint.per-file-ignores]
"src/lfx/src/lfx/components/agentics/**" = [
    "RUF012",  # keep for now
]

# after (pyproject.toml) — entry removed by hand
[tool.ruff.lint.per-file-ignores]
# (agentics entry deleted; bundle owns its own ruff config now)

import re
from pathlib import Path

def per_file_ignore_entry_matches(text: str, pattern: str) -> bool:
    block = re.compile(
        r'^"' + re.escape(pattern) + r'"\s*=\s*\[[^\]]*\]\n',
        re.MULTILINE | re.DOTALL,
    )
    return block.search(text) is not None or f'"{pattern}"' not in text

When it happens

Trigger: Running port_bundle.py --apply when the root pyproject.toml's ruff per-file-ignores section has been reformatted (different quote nesting, inline brackets, comment inside the list, or the pattern string escaped differently) so the generated regex no longer matches.

Common situations: A formatting tool or editor reflowed pyproject.toml between the time the ignore entry was added and the port; hand-edits that changed indentation or added comments inside the bracket body; regex-hostile characters in the glob.

Related errors

• Could not locate the {what} end marker ({needle!r}) in pypro
• Could not read lfx version from src/lfx/pyproject.toml
• lfx-{bundle} already referenced in {ROOT_PYPROJECT.relative_
• error: {source} entries field must be a list
• error: {source} ambiguous_bare_names field must be a list

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/0ec9479fea320077. Report an issue: GitHub.