I have a branch named 0726b and I want to diff my current working copy with that branch.
Apparently there is also a commit that has a hash starting with that very sequence, because I get
$ git diff 0726b
warning: refname '0726b' is ambiguous.
How do I tell git that it should take the argument as a branch name?
Try this:
git diff refs/heads/0726b
refs/heads/0726b specifies a branch named 0726b.
The file ./git/refs/heads/0726b contains the commit hash that this branch points to.
来源：https://stackoverflow.com/questions/51534635/how-to-resolve-ambiguity-between-branch-name-and-commit-hash-in-git