$ git clone -n https://src.fedoraproject.org/rpms/scratch.git /var/lib/mock/f41-build-1041620-18985/root/chroot_tmpdir/scmroot/scratch
Cloning into '/var/lib/mock/f41-build-1041620-18985/root/chroot_tmpdir/scmroot/scratch'...
$ git fetch origin 56126a5d98828625b66d7dd2efe1f01f98d6885d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scratch
 * [new ref]         56126a5d98828625b66d7dd2efe1f01f98d6885d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56126a5 Eliminate use of obsolete %patchN syntax (#2283636)