$ git clone -n https://gitee.com/opencloudos-stream/rubygem-mime-types.git /var/lib/mock/dist-oc9-epol-build-78448-53040/root/chroot_tmpdir/scmroot/rubygem-mime-types
Cloning into '/var/lib/mock/dist-oc9-epol-build-78448-53040/root/chroot_tmpdir/scmroot/rubygem-mime-types'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/rubygem-mime-types
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 453ff97 package init