$ git clone -n https://gitee.com/zhuhong_bo/lightdm.git /var/lib/mock/dist-an23-dde-build-543039-85941/root/chroot_tmpdir/scmroot/lightdm
Cloning into '/var/lib/mock/dist-an23-dde-build-543039-85941/root/chroot_tmpdir/scmroot/lightdm'...
$ git fetch origin dd7c49346b26c8ef216479dea8ca47554779eca7:KOJI_FETCH_HEAD
From https://gitee.com/zhuhong_bo/lightdm
 * [new ref]         dd7c49346b26c8ef216479dea8ca47554779eca7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd7c493 add enable lightdm