FR: Push local branch to a remote branch with a different name

[Zambito1]

Is your feature request related to a problem? Please describe. I am trying to deal with multiple remotes that have unrelated branches with the same name. I can make local branches the remote ones that have different names just fine, but there does not seem to be a way to push those branches without creating new ones on the remote.

Describe the solution you'd like jj branch track --local my-local-name branch@remote

This assumes #1278 is resolved

Describe alternatives you've considered

jj git push --branch my-local-name --remote-branch branch@remote
# or
jj git push --branch my-local-name --remote branch@name

[yuja]

Related: #2098 (for the alternatives)

I'm not sure if jj should support tracking local branches of different names because of UI complexity.

[dbarnett]

I keep needing this during code reviews when needing to handle different sets of changes on master@origin and master@someremote. I couldn't figure it out in jj and ended up just dropping into git to handle the branch names explicitly. Is there a simpler way in the short term?

[Zambito1]

@dbarnett If you're not trying to push to both master@origin and master@someremote (ie you're only trying to push to master@origin) you can set your master to track just one of them (master@origin) and refer to the other with its @remote (master@someremote). You don't have to have a local branch tracking the remote branch in order to reference the commits on the remote branch.

You can also make a local branch that is at the same position (but does not automatically track) the remote branch using a different name. This could be useful if you want to have both of the master branches on one remote, but one with a different name (ie jj branch c someremote/master -r master@someremote && jj git push someremote/master --remote origin). The only problem thing you can't do here that is highlighted in this issue is easily push changes from your branch that has a different name to the master branch on the remote that it was derived from.