34 lines
1.8 KiB
Markdown
34 lines
1.8 KiB
Markdown
---
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id: platform-tuios-package
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area: platform
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level: 3
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title: "Artefact — A hand-written Nix package with an exit plan"
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claim: "Twenty-five lines of Nix that pin a tool at 0.10.1 over nixpkgs' 0.7.0 — with a verified hash · a written reason and a written condition for deleting the file."
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confidence: running
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period: "2026–"
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tech: [Nix, NixOS]
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metrics: [{label: "pinned version", value: "0.10.1"}, {label: "nixpkgs version it overrides", value: "0.7.0"}]
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artefacts: [{type: repo, label: "Nix derivation — tuios 0.10.1 override with a removal condition", url: "content/assets/code/06-nix-derivation.nix"}]
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public: true
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last_verified: 2026-10-28
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tags: [platform, nix, packaging, artefact]
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---
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**Status: published.** The whole file is shown verbatim.
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## What the artefact is
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A package definition for the agent operations console: `fetchurl` against a released artifact with a verified hash, a documented reason for overriding nixpkgs, an `installPhase` that stages the binary, and a comment stating the condition under which the file should be deleted.
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## What it proves
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More than knowing Nix exists. The signals are that someone noticed a version gap, fixed it locally instead of waiting, pinned it so the fleet is reproducible, and wrote down when to remove their own patch. Knowing when to delete your own override is the senior part.
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## Why this exhibit is good code
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The override records why it exists and the exact condition under which it should be deleted, which is the part of a local patch that usually goes missing. Pinning a released binary by `fetchurl` with a verified hash keeps the result reproducible without waiting for nixpkgs.
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## When it is delivered
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Published. The file is in this repository at `content/assets/code/06-nix-derivation.nix`; the infrastructure repository remains the source. Source fact: content spine section 4.2.
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