Using difftool with meld works well, yet the headers meld shows for the two sides are 'left' and 'right'. For git diff itself there are the options --src-prefix and --dst-prefix to rename the 'a' and 'b' prefix, but it has no influence on difftool.
I am using the configuration
[difftool]
prompt = false
[difftool "meld"]
cmd = meld "$LOCAL" "$REMOTE"
and run
git difftool --dir-diff some-branch
Is there a way to get a branch name or at least a commit hash instead of the 'left' and 'right' labels?