$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng.git /var/lib/mock/dist-oc9-build-231599-81616/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-oc9-build-231599-81616/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 5fb1d3c1ebdbdaebf3b181f62ead9af9103b4e69:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng
 * [new ref]         5fb1d3c1ebdbdaebf3b181f62ead9af9103b4e69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fb1d3c import libpng-1.6.40-7.tl4