$ git clone -n https://src.fedoraproject.org/rpms/mdk.git /var/lib/mock/f45-build-18189-511/root/chroot_tmpdir/scmroot/mdk
Cloning into '/var/lib/mock/f45-build-18189-511/root/chroot_tmpdir/scmroot/mdk'...
$ git fetch origin c0da23114b0fb775b4c1a04f250d1ebaf9b20985:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mdk
 * [new ref]         c0da23114b0fb775b4c1a04f250d1ebaf9b20985 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0da231 drop ix86 support