$ git clone -n https://gitee.com/src-opencloudos-rpms/postfix.git /var/lib/mock/dist-oc9-build-210504-80609/root/chroot_tmpdir/scmroot/postfix
Cloning into '/var/lib/mock/dist-oc9-build-210504-80609/root/chroot_tmpdir/scmroot/postfix'...
$ git fetch origin f4555be33443e1c6fda3d9dc38f884434d853f14:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/postfix
 * [new ref]         f4555be33443e1c6fda3d9dc38f884434d853f14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4555be import postfix-3.8.5-5.tl4