Use ruamel.yaml.clib as default

[LecrisUT]

It seems the only thing we need to do to enable this is to pull in this dependency and switch to using safe type by default. This would be a better apple-to-apple comparison with #4486 since that one uses a C library for handling json.

Note that the clib does not respect .indent formatting hints

Indenting using typ="safe"

The C based emitter doesn’t have the fine control, distinguishing between block mappings and sequences. Do only use the pure Python versions of the dumper if you want to have that sort of control.

Reference:

• Upstream documentation: https://yaml.dev/doc/ruamel.yaml/
• Note about yaml.indent https://yaml.dev/doc/ruamel.yaml/detail

---

Pull Request Checklist

• implement the feature
• include a release note

Related to #4406

[gemini-code-assist]

Code Review

This PR enables ruamel.yaml.clib by default by adding it as a dependency and setting the default YAML type to 'safe'. A suggestion is provided for tmt/utils/__init__.py to improve conciseness. Add a release note for this performance improvement.

[LecrisUT]

/packit test

[LecrisUT]

Blocked by #4338

[psss]

Looks good, just one question and one thought: There are a couple more places where tmt is storing modified fmf files to disk:

• tmt link
• tmt test id
• tmt test export --nitrate
• tmt test export --polarion

But seems all those cases are actually using the fmf context manager approach:

with tmt_object.node as data: 
    data["link"] = [link_data]

Would be good to fix on the fmf side as well. Filed here:

• teemtee/fmf/issues/292

[thrix]

LGTM