$ git clone -n https://src.fedoraproject.org/rpms/rocrand.git /var/lib/mock/f40-build-2648502-66783/root/chroot_tmpdir/scmroot/rocrand
Cloning into '/var/lib/mock/f40-build-2648502-66783/root/chroot_tmpdir/scmroot/rocrand'...
$ git fetch origin 8c5241e24f313b745b213bc9e4e41253ff692b32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rocrand
 * [new ref]         8c5241e24f313b745b213bc9e4e41253ff692b32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c5241e Update to 6.0.2