$ git clone -n https://src.fedoraproject.org/rpms/rust-two-face.git /var/lib/mock/f41-build-870906-16071/root/chroot_tmpdir/scmroot/rust-two-face
Cloning into '/var/lib/mock/f41-build-870906-16071/root/chroot_tmpdir/scmroot/rust-two-face'...
$ git fetch origin f1772a75a07d090265a8306461ca2926acd09f38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-two-face
 * [new ref]         f1772a75a07d090265a8306461ca2926acd09f38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1772a7 Initial import (#2281999)