$ git clone -n https://gitee.com/src-opencloudos-rpms/thunderbird.git /var/lib/mock/dist-oc8-build-34930-11389/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/dist-oc8-build-34930-11389/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard origin/oc8
HEAD is now at e088610 debranding