[Bugfix] Fix --lora-modules name=path parsing when path contains '='

[hungnnvidia]

Purpose

--lora-modules accepts the documented old name=path format, but
LoRAParserAction parses it with str.split("=") (no maxsplit). When the
path itself contains = (e.g. checkpoint directories like
.../run=3/adapter), unpacking into name, path raises
ValueError: too many values to unpack (expected 2), which crashes
vllm serve at argument-parsing time.

# vllm/entrypoints/openai/cli_args.py (before)
if "=" in item and "," not in item:  # Old format: name=path
    name, path = item.split("=")     # <-- breaks when path contains '='

Fix (one line): split on the first = only, matching the intended
name=path semantics.

name, path = item.split("=", 1)

Reproduction (before the fix)

vllm serve ... --lora-modules 'module1=/path/to/run=3/adapter' raised:

name, path = item.split("=")
ValueError: too many values to unpack (expected 2)
vllm/entrypoints/openai/cli_args.py:50: ValueError

Verification (after the fix)

Parsing the same argument now succeeds:

$ python -c "... make_arg_parser(sp); print(sp.parse_args(
      ['--lora-modules', 'module1=/path/to/run=3/adapter']).lora_modules)"
PARSED OK: [LoRAModulePath(name='module1', path='/path/to/run=3/adapter', ...)]

Existing frontend CLI tests and lint/type checks pass:

$ ruff check ...cli_args.py       # All checks passed!
$ ruff format --check ...         # already formatted
$ pre-commit run mypy-3.12 ...    # Passed
$ pytest tests/entrypoints/openai/test_cli_args.py -k lora  # all pass

Not a duplicate

Searched open/all PRs for LoRAParserAction, --lora-modules splitting, and
split("="); no existing PR addresses this old-format path-parsing bug.

Notes

• AI assistance was used to find, reproduce, and fix this change; a human
  submitter has reviewed the changed line.
• CLI parsing only — no model output / accuracy / serving behavior is affected,
  so no eval results are applicable.

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[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @hungnnvidia.

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[mergify]

This pull request has merge conflicts that must be resolved before it can be
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No actionable comments were generated in the recent review. 🎉

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• vllm/entrypoints/launchers/cli_args.py

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • LoRA module paths containing the = character are now handled correctly when provided through the command line.

Walkthrough

The LoRA parser now splits name=path arguments at the first equals sign only. This preserves additional equals signs in LoRA paths.

Changes

LoRA path parsing

Layer / File(s)	Summary
Preserve equals signs in paths vllm/entrypoints/launchers/cli_args.py	LoRAParserAction.__call__ uses split("=", 1) so paths retain additional equals signs.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to e1d35

LoRA module arguments using legacy name=path syntax now retain equals signs within checkpoint paths, preventing startup parsing failures for those paths. The change is ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main bugfix: correcting --lora-modules name=path parsing when paths contain an equals sign.
Description check	✅ Passed	The description directly explains the parsing bug, the one-line fix, reproduction case, verification, and scope. It is fully related to the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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[jeejeelee]

/ci run

[github-actions]

✅ Triggered Buildkite CI #88467 for commit e1d35ad87fda.

[hungnnvidia]

The failing *-multimodal-processor shards are unrelated to this PR. Please help me check again and run /ci-retry @jeejeelee @DarkLight1337 Dar