$ git clone -n https://src.fedoraproject.org/rpms/trafficserver.git /var/lib/mock/f40-build-757039-119116/root/chroot_tmpdir/scmroot/trafficserver
Cloning into '/var/lib/mock/f40-build-757039-119116/root/chroot_tmpdir/scmroot/trafficserver'...
$ git fetch origin d1a41acd919d61017c4eda0982cf29dc0a656180:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trafficserver
 * [new ref]         d1a41acd919d61017c4eda0982cf29dc0a656180 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1a41ac Update to upstream 9.2.3