$ git clone -n https://gitee.com/wenyuzifang/re2.git /var/lib/mock/dist-an23-build-481760-74252/root/chroot_tmpdir/scmroot/re2
Cloning into '/var/lib/mock/dist-an23-build-481760-74252/root/chroot_tmpdir/scmroot/re2'...
$ git fetch origin 20bd900a8b184b9d188d8b10dd5ac2158e61471f:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/re2
 * [new ref]         20bd900a8b184b9d188d8b10dd5ac2158e61471f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20bd900 Update code from upstream