$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-MIME-Base64.git /var/lib/mock/dist-oc9-build-64272-16463/root/chroot_tmpdir/scmroot/perl-MIME-Base64
Cloning into '/var/lib/mock/dist-oc9-build-64272-16463/root/chroot_tmpdir/scmroot/perl-MIME-Base64'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-MIME-Base64
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0191d28 import perl-MIME-Base64-3.16-5.tl4