$ git clone -n https://gitee.com/src-opencloudos-rpms/dovecot.git /var/lib/mock/dist-oc9-build-51947-14596/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/dist-oc9-build-51947-14596/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/dovecot
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0aacf9a import dovecot-2.3.19.1-3.tl4