$ git clone -n https://src.fedoraproject.org/rpms/gtengine.git /var/lib/mock/f41-build-836245-158792/root/chroot_tmpdir/scmroot/gtengine
Cloning into '/var/lib/mock/f41-build-836245-158792/root/chroot_tmpdir/scmroot/gtengine'...
$ git fetch origin 7af6aa09e520879f70e18bb14d7f509fc42a3afd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtengine
 * [new ref]         7af6aa09e520879f70e18bb14d7f509fc42a3afd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7af6aa0 Release 7.1|Fix library version