$ git clone -n https://gitee.com/opencloudos-stream/bootc.git /var/lib/mock/dist-oc9-epol-build-229186-81294/root/chroot_tmpdir/scmroot/bootc
Cloning into '/var/lib/mock/dist-oc9-epol-build-229186-81294/root/chroot_tmpdir/scmroot/bootc'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/bootc
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54e186e !2 init Merge pull request !2 from doriscchao/master