$ git clone -n https://gitee.com/src-opencloudos-rpms/thunderbird.git /var/lib/mock/dist-oc8-firefox-build-241253-82834/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/dist-oc8-firefox-build-241253-82834/root/chroot_tmpdir/scmroot/thunderbird'...
$ git fetch origin b246e253e90523b3106ff1bd8a7b6f44108635a8:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/thunderbird
 * [new ref]         b246e253e90523b3106ff1bd8a7b6f44108635a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b246e25 import thunderbird-140.10.1-1.tl3.ap.1