$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng.git /var/lib/mock/dist-oc9-build-238155-82511/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-oc9-build-238155-82511/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 496f85d91b83994c67b5f99e3de4681a52c8374f:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng
 * [new ref]         496f85d91b83994c67b5f99e3de4681a52c8374f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 496f85d import libpng-1.6.40-9.tl4