$ git clone -n https://src.fedoraproject.org/rpms/rubygem-webrobots.git /var/lib/mock/f40-build-2034529-47899/root/chroot_tmpdir/scmroot/rubygem-webrobots
Cloning into '/var/lib/mock/f40-build-2034529-47899/root/chroot_tmpdir/scmroot/rubygem-webrobots'...
$ git fetch origin cbe86cd28eeae1499f7dfebd63638a0dbcae0965:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-webrobots
 * [new ref]         cbe86cd28eeae1499f7dfebd63638a0dbcae0965 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbe86cd SPDX migration