$ git clone -n https://gitee.com/opencloudos-stream/jc.git /var/lib/mock/dist-oc9-epol-build-82542-57112/root/chroot_tmpdir/scmroot/jc
Cloning into '/var/lib/mock/dist-oc9-epol-build-82542-57112/root/chroot_tmpdir/scmroot/jc'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/jc
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b49a4b0 package init