$ git clone -n https://gitee.com/sys0613/mesa-demos.git /var/lib/mock/dist-an23-build-273702-64217/root/chroot_tmpdir/scmroot/mesa-demos
Cloning into '/var/lib/mock/dist-an23-build-273702-64217/root/chroot_tmpdir/scmroot/mesa-demos'...
$ git fetch origin 134e8bc8e97c5214262181413647ba564ce0150e:KOJI_FETCH_HEAD
From https://gitee.com/sys0613/mesa-demos
 * [new ref]         134e8bc8e97c5214262181413647ba564ce0150e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 134e8bc update to mesa-demos-8.4.0-5.20181118git1830dcb.el8.src.rpm