$ git clone -n https://gitee.com/src-opencloudos-rpms/dovecot.git /var/lib/mock/dist-oc8-build-74751-51210/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/dist-oc8-build-74751-51210/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin 0a06ad1e392b8a5dc7848bf2344d275c2f487e19:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/dovecot
 * [new ref]         0a06ad1e392b8a5dc7848bf2344d275c2f487e19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a06ad1 import dovecot-2.3.16-5.tl3