$ git clone -n https://gitee.com/src-opencloudos-rpms/regexp.git /var/lib/mock/dist-oc9-build-62300-16463/root/chroot_tmpdir/scmroot/regexp
Cloning into '/var/lib/mock/dist-oc9-build-62300-16463/root/chroot_tmpdir/scmroot/regexp'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/regexp
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9e3fed import regexp-1.5-5.tl4