$ git clone -n https://gitee.com/src-opencloudos-rpms/boom-boot.git /var/lib/mock/dist-oc9-build-40735-14591/root/chroot_tmpdir/scmroot/boom-boot
Cloning into '/var/lib/mock/dist-oc9-build-40735-14591/root/chroot_tmpdir/scmroot/boom-boot'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/boom-boot
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 541dcf7 import boom-boot-1.5.1-1.tl4