$ git clone -n https://src.fedoraproject.org/rpms/rust-pretty-git-prompt.git /var/lib/mock/f41-build-861548-169829/root/chroot_tmpdir/scmroot/rust-pretty-git-prompt
Cloning into '/var/lib/mock/f41-build-861548-169829/root/chroot_tmpdir/scmroot/rust-pretty-git-prompt'...
$ git fetch origin 7d2044142f11f7f75f883c3a2e3565c13a9d22b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pretty-git-prompt
 * [new ref]         7d2044142f11f7f75f883c3a2e3565c13a9d22b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d20441 Bump git2 dependency from 0.18 to 0.19