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Warn when using nix.optimise #488

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Merged
astro merged 1 commit into from
Mar 17, 2026
Merged

Warn when using nix.optimise #488

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3 changes: 3 additions & 0 deletions nixos-modules/microvm/asserts.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -120,5 +120,8 @@ lib.mkIf config.microvm.guest.enable {
# 32 MB is just an optimistic guess, not based on experience
lib.optional (config.microvm.mem < 32) ''
MicroVM ${hostName}: ${toString config.microvm.mem} MB of RAM is uncomfortably narrow.
''
++ lib.optional config.nix.optimise.automatic ''
Optimising the nix store is not recommended as it either uses lots of file handles with virtiofsd or as it doesn't do what you expect with a block device.
'';
}
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