$ git clone -n https://src.fedoraproject.org/rpms/rust-binfmt-dispatcher.git /var/lib/mock/f42-build-3426600-45197/root/chroot_tmpdir/scmroot/rust-binfmt-dispatcher
Cloning into '/var/lib/mock/f42-build-3426600-45197/root/chroot_tmpdir/scmroot/rust-binfmt-dispatcher'...
$ git fetch origin 1cf2b069c0d40be31ede195b437fb7d31e52ffc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-binfmt-dispatcher
 * [new ref]         1cf2b069c0d40be31ede195b437fb7d31e52ffc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cf2b06 Update to 0.1.1