$ git clone -n https://gitee.com/opencloudos-stream/bc.git /var/lib/mock/dist-ocs23-build-233667-20035/root/chroot_tmpdir/scmroot/bc
Cloning into '/var/lib/mock/dist-ocs23-build-233667-20035/root/chroot_tmpdir/scmroot/bc'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/bc
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f55e7b2 Rebuilt for loongarch release