$ git clone -n https://gitee.com/opencloudos-stream/golang-github-emersion-mbox.git /var/lib/mock/dist-oc9-epol-build-102789-66087/root/chroot_tmpdir/scmroot/golang-github-emersion-mbox
Cloning into '/var/lib/mock/dist-oc9-epol-build-102789-66087/root/chroot_tmpdir/scmroot/golang-github-emersion-mbox'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/golang-github-emersion-mbox
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b12d1b0 update