$ git clone -n https://gitee.com/src-anolis-os/mesa-demos.git /var/lib/mock/dist-an8.7-build-269839-64112/root/chroot_tmpdir/scmroot/mesa-demos
Cloning into '/var/lib/mock/dist-an8.7-build-269839-64112/root/chroot_tmpdir/scmroot/mesa-demos'...
$ git reset --hard origin/a8
HEAD is now at 134e8bc update to mesa-demos-8.4.0-5.20181118git1830dcb.el8.src.rpm