Add support for gerrit

[nbarbey]

Would it be possible to add an option to push the temporary branch to a gerrit server ?
This would require to be able to push to gerrit "magic" refs/for/ instead of refs/heads
For now when I try to use mob with a gerrit server I get this error :

ERROR remote: error: branch refs/heads/mob-session:
ERROR remote: Push to refs/for/mob-session to create a review, or get 'Push' rights to update the branch.
ERROR remote: User: nicolas.barbey
ERROR remote: Contact an administrator to fix the permissions
remote: Processing changes: refs: 1, done  
ERROR To ssh://review.***.ci:29418/***
ERROR ! [remote rejected]         mob-session -> mob-session (prohibited by Gerrit: not permitted: update)
ERROR error: impossible de pousser des références vers 'ssh://review.***:29418/**'
ERROR exit status 1

[hollesse]

Hi @nbarbey could you give me some more information how gerrit works and how your gerrit is configured? I just tried it myself with a gerrit running locally with docker. There I am able to do a mob start and mob next. So are you just allowed to push to refs/for? Would it be ok to push there? As I understood gerrit this creates a code review for someone else. Is that a problem?

[nbarbey]

Hello @hollesse !
Thank you for answering this !
Yes, gerrit is set up at my company in a way that we are only allowed to push to refs/for.
Indeed, it creates a "code review"/"pull request" there. This is a mandatory step before merging the commit anyway.
So that would be ok to have the temporary branch of the session there I think.
Also there is a way to send to refs/for without triggering the CI tests by suffixing the branch name to %wip, putting the code review into a "Work In Progress" state.

[hollesse]

Okay it seems that we would need an configuration to create a custom git reference and if this is set use this instead of heads. Would you like to contribute and create a pull request for that @nbarbey ?

[nbarbey]

I tried this a bit. I struggled to warp my head into the code with the little time I had. When I stopped it seemed to me that head was implicit in some of the calls to the git command but I could not figure out where.
Perhaps we should mob this out ;-)

[hollesse]

@nbarbey correct the head is implicit right now. We would need to make it explicit and afterwards configurable.
I like the idea of doing it in a mob, but I need to check if I can find time for that. @gregorriegler Do you know if maybe you could find some time for that?

[gregorriegler]

@hollesse I am up for it, but would have to be an evening. Something like 17:00 - 19:00