langflow-ai/langflow · warning · SystemExit

lfx-{bundle} already referenced in {ROOT_PYPROJECT.relative_

Error message

lfx-{bundle} already referenced in {ROOT_PYPROJECT.relative_to(REPO_ROOT)}; not patching.

What it means

The bundle-migration helper scripts/migrate/port_bundle.py refuses to patch the root pyproject.toml when the string 'lfx-{bundle}' is already present anywhere in that file. This is a guard against double-applying dependency/source/workspace-member entries. It exits via SystemExit, aborting the port before any partial writes.

Source

Thrown at scripts/migrate/port_bundle.py:1147

            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."
        )
        raise SystemExit(msg)
    line_start = text.rfind("\n", 0, idx) + 1
    return text[:line_start] + payload + text[line_start:]


def _patch_root_pyproject(plan: PortPlan, *, apply: bool) -> list[str]:
    actions = [f"patch {ROOT_PYPROJECT.relative_to(REPO_ROOT)}"]
    if not apply:
        return actions
    text = ROOT_PYPROJECT.read_text(encoding="utf-8")
    bundle = plan.bundle

    if f"lfx-{bundle}" in text:
        msg = f"lfx-{bundle} already referenced in {ROOT_PYPROJECT.relative_to(REPO_ROOT)}; not patching."
        raise SystemExit(msg)

    dep_line = f'    "lfx-{bundle}>=0.1.0",\n'
    source_line = f"lfx-{bundle} = {{ workspace = true }}\n"
    member_line = f'    "src/bundles/{bundle}",\n'

    new_text = _insert_before_marker(text, "# langflow-extensions:bundle-deps-end", dep_line, what="bundle-deps")
    new_text = _insert_before_marker(
        new_text, "# langflow-extensions:bundle-sources-end", source_line, what="bundle-sources"
    )
    new_text = _insert_before_marker(
        new_text, "# langflow-extensions:bundle-members-end", member_line, what="bundle-members"
    )
    ROOT_PYPROJECT.write_text(new_text, encoding="utf-8")
    return actions


def _rewrite_consumers(plan: PortPlan, *, apply: bool) -> list[str]:
    if not plan.consumer_rewrites:

View on GitHub (pinned to 976ec789d2)

Solutions

1. Check whether the bundle was already ported: search root pyproject.toml for 'lfx-<bundle>' in the bundle-deps, bundle-sources and bundle-members marker blocks — if all three entries exist, the port is done and you can skip patching.
2. If the reference is a stale leftover from an aborted run, remove the lfx-<bundle> lines from the three marker blocks and re-run the script.
3. Run without --apply first to preview planned actions and confirm which steps remain.

Example fix

# before: re-running port_bundle.py --apply for an already-ported bundle
# after: verify entries then skip
# grep 'lfx-mistral' pyproject.toml  -> present in deps/sources/members? port complete; no action needed

import re, sys
from pathlib import Path
bundle = "mistral"
text = Path("pyproject.toml").read_text()
if f"lfx-{bundle}" in text:
    deps = f'    "lfx-{bundle}>=0.1.0",' in text
    srcs = f"lfx-{bundle} = {{ workspace = true }}" in text
    members = f'    "src/bundles/{bundle}",' in text
    print(f"already referenced: deps={deps} sources={srcs} members={members}")
    sys.exit(0)  # treat as done, skip the patch step

When it happens

Trigger: Running port_bundle.py --apply (or any path that sets apply=True) twice for the same bundle; or porting a bundle whose name already appears in the root pyproject.toml from a previous migration or manual edit.

Common situations: Re-running a partially completed migration; a teammate already ported the bundle; a manual pyproject.toml edit referenced the bundle earlier and the marker-based insertion would now duplicate it.

Related errors

• destination already exists (already consolidated?): {dst}
• Bundle directory already exists: {bundle_dir}. Refusing to
• Could not locate the {what} end marker ({needle!r}) in pypro
• provider directory not found: {src}
• {provider}: source has subdirectory/ies {subdirs} that move_

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/728ce54f64142769. Report an issue: GitHub.