$ git clone -n https://gitee.com/opencloudos-stream/libpng.git /var/lib/mock/dist-ocs23-base-build-359765-42145/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-ocs23-base-build-359765-42145/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/libpng
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6866b4 !5 Apply security patch for libpng Merge pull request !5 from ocs-bot/master