$ git clone -n https://gitee.com/xzyang-anolis/docker.git /var/lib/mock/dist-an7-extras-build-374926-60069/root/chroot_tmpdir/scmroot/docker
Cloning into '/var/lib/mock/dist-an7-extras-build-374926-60069/root/chroot_tmpdir/scmroot/docker'...
$ git fetch origin a7-extras:KOJI_FETCH_HEAD
From https://gitee.com/xzyang-anolis/docker
 * [new branch]      a7-extras  -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a30f309 Update to docker-1.13.1-210.git7d71120.el7_9