disko builds its format/mount script at install time; offline, the script's tool closure (file, which, wrapper hooks) wasn't on the ISO and nix tried to build it from source — which needs the network. Pre-building one representative script (luks + swap variant) pins every input; the user's actual invocation then differs only in the final text-generation derivation, which builds offline in seconds. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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