$ git clone -n https://gitee.com/opencloudos-stream/libpng.git /var/lib/mock/dist-ocs23-build-25624-1191/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-ocs23-build-25624-1191/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin HEAD:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/libpng
 * [new ref]                    -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c1936a !1 Upgrade 1.6.40 Merge pull request !1 from kianli/master