$ git clone -n https://src.fedoraproject.org/rpms/libxmp.git /var/lib/mock/f45-build-17333-498/root/chroot_tmpdir/scmroot/libxmp
Cloning into '/var/lib/mock/f45-build-17333-498/root/chroot_tmpdir/scmroot/libxmp'...
$ git fetch origin b70172a53d4abcab7f3eaa9b18f7b22e03d5a704:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxmp
 * [new ref]         b70172a53d4abcab7f3eaa9b18f7b22e03d5a704 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b70172a update to 4.7.2 (resolves rhbz#2509260)