$ git clone -n https://gitee.com/fundawang/libpng.git /var/lib/mock/dist-an23-build-132472-46872/root/chroot_tmpdir/scmroot/libpng
Cloning into '/var/lib/mock/dist-an23-build-132472-46872/root/chroot_tmpdir/scmroot/libpng'...
$ git reset --hard 8b8d2c159fa7dfbefe9b154f92696d3d534e5a15
HEAD is now at 8b8d2c1 New version 1.6.38