$ git clone -n https://gitee.com/opencloudos-stream/firefox.git /var/lib/mock/dist-ocs23-base-build-320408-33736/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/dist-ocs23-base-build-320408-33736/root/chroot_tmpdir/scmroot/firefox'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/firefox
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a56e73 !35 Add script for rpm-upgrade. Merge pull request !35 from doriscchao/master