$ git clone -n https://gitee.com/opencloudos-stream/iso-country-flags.git /var/lib/mock/dist-oc9-epol-build-76005-52395/root/chroot_tmpdir/scmroot/iso-country-flags
Cloning into '/var/lib/mock/dist-oc9-epol-build-76005-52395/root/chroot_tmpdir/scmroot/iso-country-flags'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/iso-country-flags
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4afc769 package init