$ git clone -n https://src.fedoraproject.org/rpms/kf5-kjs.git /var/lib/mock/f40-build-786952-134636/root/chroot_tmpdir/scmroot/kf5-kjs
Cloning into '/var/lib/mock/f40-build-786952-134636/root/chroot_tmpdir/scmroot/kf5-kjs'...
$ git fetch origin ad9f872854f6807aeec6fe5a03af855d84d30612:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kjs
 * [new ref]         ad9f872854f6807aeec6fe5a03af855d84d30612 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad9f872 5.115.0