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add disk script - #469
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add disk script#469
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ryantm
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airportyh and
vlinkz
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airportyh
January 28, 2026 21:53
Why === * The nix modules disk builds too slowly. * Moving the squashfs and tarball steps out of nix should make it faster * We can also speed up things and make the disk smaller with different compression choices What changed === * move squashfs and tarball steps into one script called disk-script that you can run with `nix run -L .#disk-script` or `nix run -L .#disk-script-dev` * run xargs cp in parallel * use lz4 compression for squashfs and 1M block size * use --best --recursive for pigz compression on tarball * add output for the time each stage takes Test plan === * ran it locally ``` xargs copy took 306 seconds mksquashfs took 148 seconds tar took 140 seconds ``` ~10 minutes ``` $ du -h /tmp/tmp.Lj42PAdmKN/disk.sqsh 21G /tmp/tmp.Lj42PAdmKN/disk.sqsh $ du -h /tmp/tmp.Lj42PAdmKN/disk.sqsh.tar.gz 17G /tmp/tmp.Lj42PAdmKN/disk.sqsh.tar.gz ```
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vlinkz
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Jan 28, 2026
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Why
What changed
nix run -L .#disk-scriptornix run -L .#disk-script-devTest plan
~10 minutes (note this was with the .#bundle already being built and cached on my local system.)