$ git clone -n https://gitee.com/src-opencloudos-rpms/firefox.git /var/lib/mock/dist-oc9-build-253831-84338/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/dist-oc9-build-253831-84338/root/chroot_tmpdir/scmroot/firefox'...
$ git fetch origin 3cc896f73d792016a8b0749fa2771d647fd76542:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/firefox
 * [new ref]         3cc896f73d792016a8b0749fa2771d647fd76542 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3cc896f import firefox-153.5.1-1.tl4.ap.1