$ git clone -n https://src.fedoraproject.org/rpms/rubygem-websocket.git /var/lib/mock/f45-build-35402-695/root/chroot_tmpdir/scmroot/rubygem-websocket
Cloning into '/var/lib/mock/f45-build-35402-695/root/chroot_tmpdir/scmroot/rubygem-websocket'...
$ git fetch origin d1e2728d6493e0c9ff95e738fa07b6b6f5cb5a1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-websocket
 * [new ref]         d1e2728d6493e0c9ff95e738fa07b6b6f5cb5a1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1e2728 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild