git-p4 sync on different branch and repo

I'm trying to mirror a perforce repository, and git-p4 performs well enough on the main branch. I simply have to call git-p4 rebase. I'm also trying to mirror a different branch, but that's not working out so easily. I thought I could just do a git-p4 rebase --branch=p4/whatever //open/branches/whatever but r开发者_开发技巧ebase appears to ignore those tags, and if I do a sync instead I get the error message: fast-import failed: warning: Not updating refs/heads/p4/whatever (new tip 14f7e14e5079bb730363440901adee102e5f04c9 does not contain 0ca89b0333f408367e3676720b109a08cc40b3ae)

My initial import was a sync with @all, why wouldn't it be able to update, or is there a different/better way to do this?

git-p4 doesn't work well when you try to have more than one p4 head in git. Sad I know. What I ended up doing was having each main/branch in separate git repos. It doesn't allow for branch management I know.

Also @all does not work for me either because it tries to figure out the branches and then fails. I only use git-p4 to get the latest and use the history from there onwards.