$ git clone -n https://gitee.com/src-opencloudos-rpms/cyrus-imapd.git /var/lib/mock/dist-oc8-build-236491-82298/root/chroot_tmpdir/scmroot/cyrus-imapd
Cloning into '/var/lib/mock/dist-oc8-build-236491-82298/root/chroot_tmpdir/scmroot/cyrus-imapd'...
$ git fetch origin b2e852506ab5018d28ee065f15f2c4b1fc53cb42:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/cyrus-imapd
 * [new ref]         b2e852506ab5018d28ee065f15f2c4b1fc53cb42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2e8525 import cyrus-imapd-3.0.7-28.tl3