$ git clone -n https://gitee.com/src-opencloudos-rpms/thunderbird /var/lib/mock/dist-oc8-build-38978-13101/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/dist-oc8-build-38978-13101/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard origin/oc8
HEAD is now at 2379cbd debranding for OpenCloudOS