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The RNG can't actually be seeded from a shell script, due to the reliance on ioctls. For this reason, the seedrng project provides a basic script meant to be copy and pasted into projects like OpenWRT and tweaked as needed: <https://git.zx2c4.com/seedrng/about/>. This commit imports it into the urandom-seed package and wires up the init scripts to call it. This also is a significant improvement over the current init script, which does not robustly handle cleaning up of seeds and syncing to prevent reuse. Additionally, the existing script creates a new seed immediately after writing an old one, which means that the amount of entropy might actually regress, due to failing to credit the old seed. Closes: https://github.com/openwrt/openwrt/issues/9570 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Petr Štetiar <ynezz@true.cz> [fixed missing INSTALL_DIR]