$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng.git /var/lib/mock/dist-oc9-build-236841-82332/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-oc9-build-236841-82332/root/chroot_tmpdir/scmroot/libpng'...
$ git fetch origin 1db3f9b3f21773211f7c3b991622ea9ad4a8777e:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng
 * [new ref]         1db3f9b3f21773211f7c3b991622ea9ad4a8777e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1db3f9b import libpng-1.6.40-8.tl4