$ git clone -n https://gitee.com/opencloudos-stream/rubygem-safe_yaml.git /var/lib/mock/dist-oc9-epol-build-106626-66855/root/chroot_tmpdir/scmroot/rubygem-safe_yaml
Cloning into '/var/lib/mock/dist-oc9-epol-build-106626-66855/root/chroot_tmpdir/scmroot/rubygem-safe_yaml'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rubygem-safe_yaml
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8242e1 update