`git_commit_amend` not available.

[Parakleta]

Additionally Repository.create_commit fails if the first parent is not the tip of the branch being updated, so the behaviour cannot be fudged by making a new commit with the tip's parent.

[carlosmn]

Passing in the branch name is for appending history, which is why it has the check as a guard against race conditions. You can create a commit and update the reference to your commit just the same, which is all that an ammend method does itself.

[tmr232]

Maybe add a commit_amend function, or add the use-case to the docs?

[dsully]

+1 to adding some documentation here.