$ git clone -n https://src.fedoraproject.org/rpms/SILLY.git /var/lib/mock/f41-build-1034161-18618/root/chroot_tmpdir/scmroot/SILLY
Cloning into '/var/lib/mock/f41-build-1034161-18618/root/chroot_tmpdir/scmroot/SILLY'...
$ git fetch origin c4d1c9271ab2b37fb79f8b57fe897d676609dd4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/SILLY
 * [new ref]         c4d1c9271ab2b37fb79f8b57fe897d676609dd4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4d1c92 Eliminate use of obsolete %patchN syntax (#2283636)