$ git clone -n https://src.fedoraproject.org/rpms/derrick.git /var/lib/mock/f41-build-2628690-25583/root/chroot_tmpdir/scmroot/derrick
Cloning into '/var/lib/mock/f41-build-2628690-25583/root/chroot_tmpdir/scmroot/derrick'...
$ git fetch origin ea6f7d4c313f38cfea81c5c1fece8ea35aba96cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/derrick
 * [new ref]         ea6f7d4c313f38cfea81c5c1fece8ea35aba96cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea6f7d4 convert license to SPDX