$ git clone -n https://gitee.com/src-opencloudos-rpms/thunderbird.git /var/lib/mock/dist-oc8-firefox-build-241555-82855/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/dist-oc8-firefox-build-241555-82855/root/chroot_tmpdir/scmroot/thunderbird'...
$ git fetch origin 34c39e4b2b6a147abdf3f750248d8a289c987231:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/thunderbird
 * [new ref]         34c39e4b2b6a147abdf3f750248d8a289c987231 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34c39e4 import thunderbird-140.11.0-1.tl3.ap.1