$ git clone -n https://gitee.com/opencloudos-stream/open-sendmail.git /var/lib/mock/dist-oc9-epol-build-76766-52595/root/chroot_tmpdir/scmroot/open-sendmail
Cloning into '/var/lib/mock/dist-oc9-epol-build-76766-52595/root/chroot_tmpdir/scmroot/open-sendmail'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/open-sendmail
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2301b4e package init