$ git clone -n https://src.fedoraproject.org/rpms/dosbox-staging.git /var/lib/mock/f42-build-3424836-45166/root/chroot_tmpdir/scmroot/dosbox-staging
Cloning into '/var/lib/mock/f42-build-3424836-45166/root/chroot_tmpdir/scmroot/dosbox-staging'...
$ git fetch origin 4202c8fe895e9fa1bc7ae6865d95166f7a0508cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dosbox-staging
 * [new ref]         4202c8fe895e9fa1bc7ae6865d95166f7a0508cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4202c8f Disable SSE2 and SSSE3 (rhbz#2347233)