fix(framework) Allow commas in FAB file names

[danielpolimac]

Issue

Description

FAB installation fails when an app contains a file whose name includes a comma. The CONTENT manifest parser splits every comma, so the file path is parsed as multiple fields and raises ValueError.

Related issues/PRs

Fixes #7944.

Proposal

Explanation

Parse each CONTENT manifest entry from the right with two splits. The hash and size fields remain fixed, while any commas in the preceding relative path are preserved.

Add a regression test that verifies the hash of a file named metrics,round=1.json.

Checklist

• Implement proposed change
• Write tests
• Update documentation (not needed; this restores supported file handling)
• Address LLM-reviewer comments, if applicable (review completed with no comments)
• Make local checks pass
• Make CI checks pass
• Ping maintainers on Slack (channel #contributions)

Any other comments?

Local verification:

• python -m pytest py/flwr/cli/install_test.py
• python -m ruff check py/flwr/cli/install.py py/flwr/cli/install_test.py --no-respect-gitignore
• uv run --no-sync --python=3.11.14 ./dev/test.sh false

[Copilot]

Pull request overview

This PR fixes FAB installation failures when a file path in the .info/CONTENT manifest contains commas by changing the manifest parsing logic to split from the right, preserving commas in the path portion while still extracting the fixed hash and size fields.

Changes:

• Update _verify_hashes to parse CONTENT manifest lines with rsplit(",", maxsplit=2) so commas in file paths no longer break parsing.
• Add a regression test covering a file named metrics,round=1.json to ensure hash verification succeeds.

Critical issues

• None found.

Simplicity/readability suggestions

• None required.

Consistency concerns

• None found (the test’s size_bits field matches the existing CONTENT manifest format in build.py).

Should this PR be split?

• No.

Overall verdict

• The change is minimal, targeted to the reported failure mode, and includes a regression test.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
framework/py/flwr/cli/install.py	Parse CONTENT manifest entries from the right to preserve commas in relative paths.
framework/py/flwr/cli/install_test.py	Add regression test ensuring _verify_hashes accepts commas in filenames.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.