$ git clone -n https://src.fedoraproject.org/rpms/genesis-simulator.git /var/lib/mock/f40-build-763403-122479/root/chroot_tmpdir/scmroot/genesis-simulator
Cloning into '/var/lib/mock/f40-build-763403-122479/root/chroot_tmpdir/scmroot/genesis-simulator'...
$ git fetch origin fc3ca06f81f1e04adcba46c2220def9aec188a17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/genesis-simulator
 * [new ref]         fc3ca06f81f1e04adcba46c2220def9aec188a17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc3ca06 Set build_type_safety_c to 0 (#2150772)