$ git clone -n https://src.fedoraproject.org/rpms/rust-pretty-git-prompt.git /var/lib/mock/f45-build-43944-809/root/chroot_tmpdir/scmroot/rust-pretty-git-prompt
Cloning into '/var/lib/mock/f45-build-43944-809/root/chroot_tmpdir/scmroot/rust-pretty-git-prompt'...
$ git fetch origin 6dd8ae1ced20e565f43ba967386652c69558a8a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pretty-git-prompt
 * [new ref]         6dd8ae1ced20e565f43ba967386652c69558a8a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dd8ae1 Rebuild with latest libgit2-sys crate for libgit2 fixes