FR: Gerrit support

[ilyagr]

I'm creating a placeholder bug to reference.

See https://martinvonz.github.io/jj/latest/FAQ/#how-do-i-integrate-jujutsu-with-gerrit for current status.

This would likely be a collection of jj gerrit commands.

[steveklabnik]

See also #2845

[PhilipMetzger]

And also related #485.

[dbarnett]

What's the scope of Gerrit-specific functionality we're planning to integrate? From the links above it looks like gerrit send and/or something for rewriting commit messages on push, and then something for pushing stacked reviews.

I just filed a corresponding GitHub issue #4555 so I'm wondering what functionality would have Gerrit equivalents (and also whether jj [forgename] foo commands for those things are really necessary or should be modeled at another level).

[avamsi]

Mirroring #2845 (comment):

In case it helps anyone, I set Change-Id using templates.draft_commit_description and just git push:

[template-aliases]
	'gerrit_change_id(change_id)' = '"Id0000000" ++ change_id.normal_hex()'

[templates]
	draft_commit_description = '''
		separate("\n",
			description.remove_suffix("\n"),
			if(!description.contains(change_id.normal_hex()),
				"\nChange-Id: " ++ gerrit_change_id(change_id)
			),
			"\n",
			surround("JJ: Changes:\n", "", indent("JJ: \t", diff.summary()))
		)
	'''

(https://github.com/avamsi/dotfiles/blob/28a0e40439de56fe179a1b0e705727c85e075464/.jjconfig.toml#L146-L156)

[Benjamin-Davies]

Perhaps there should be a nice way to download the latest commit for a given change (referenced by either the Gerrit "Change-Id", the Gerrit numeric id, or a revset).

Edit (just read #2845 (comment)): The tool could also (by default) update a change that has the same Gerrit "Change-Id" to use the newly pulled commit.