$ git clone -n https://gitee.com/src-opencloudos-rpms/libevent.git /var/lib/mock/dist-oc9-build-61874-16463/root/chroot_tmpdir/scmroot/libevent
Cloning into '/var/lib/mock/dist-oc9-build-61874-16463/root/chroot_tmpdir/scmroot/libevent'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libevent
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e57ef17 import libevent-2.1.12-4.tl4