$ git clone -n https://gitee.com/src-opencloudos-rpms/dovecot /var/lib/mock/dist-oc8-build-57869-15781/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/dist-oc8-build-57869-15781/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin oc8:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/dovecot
 * [new branch]      oc8        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 363d8ea import dovecot-2.3.16-4.tl3