$ git clone -n https://gitee.com/opencloudos-stream/BackupPC-XS.git /var/lib/mock/dist-oc9-epol-build-90457-59064/root/chroot_tmpdir/scmroot/BackupPC-XS
Cloning into '/var/lib/mock/dist-oc9-epol-build-90457-59064/root/chroot_tmpdir/scmroot/BackupPC-XS'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/BackupPC-XS
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3901d71 package init