$ git clone -n https://src.fedoraproject.org/rpms/CuraEngine.git /var/lib/mock/f39-build-2548931-61915/root/chroot_tmpdir/scmroot/CuraEngine
Cloning into '/var/lib/mock/f39-build-2548931-61915/root/chroot_tmpdir/scmroot/CuraEngine'...
$ git fetch origin 9293b0433c12efcd9df4f9af6fc764acf6ee3dfb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/CuraEngine
 * [new ref]         9293b0433c12efcd9df4f9af6fc764acf6ee3dfb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9293b04 Update to 5.4.0