Registering fails when you mention a tag

[nkottary]

This is after #335 was merged.

As pointed out in that PR we need the origin/ prefix for git rev-parse so that we can get the tree SHA for non-default branches. It does not work however when we use a tag. For example origin/v0.4. So to solve this issue I think we should have two input fields one for Tag and another for Branch instead of having both in the same field. So now when we get a Tag we prefix with tags/. For example, tags/v0.4 which works.

[StefanKarpinski]

If we make a bare mirror clone of the upstream repo then we would get all of the branches, tags, etc.

[StefanKarpinski]

Even without that, it seems better to try and see if somethings works as a tag and if that fails then try it as a branch, rather than complicating the UI further.

[nkottary]

Thanks! --bare gives us what we need. There is also --mirror as you pointed out. In addtion to remote branches and tags which --bare gives us, --mirror gives all refs as well but I don't know if we need that.

[StefanKarpinski]

Yes, bare seems sufficient. I can never remember what the difference is.