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kevinveenbirkenbachandClaude Opus 5
c55f508e05
The cosmos generator linked a consumer to its provider only through an '<role>' in group_names reference or an explicit provides: name. A hard dependency has neither -- pinning the provider on unconditionally is exactly what removes the Jinja reference the generator was reading -- so web-svc-asset's bond to web-svc-file vanished from the diagram the moment it became binding. Match a service key against the provider's own primary key from the registry, in both directions. Services the role turns off drew a solid 1:1 edge, claiming a mandatory relationship for something that carries nothing at deploy time. They now render as a red 0..0 edge; edge merging gained a real precedence so a provider consumed through two keys stays live when only one is off. Named colour, not hex: a '#' opens an entity code in the mermaid lexer and turns the whole diagram into a parse error on GitHub. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
101 lines
3.6 KiB
Markdown
101 lines
3.6 KiB
Markdown
# dev-nix
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This role installs the Nix package manager in a **secure, reproducible, and
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idempotent** way across multiple Linux distributions.
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## Description
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The role installs **Nix** using either the native package manager
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(where supported and reliable) or the **official installer** with
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**SHA256 verification**.
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On platforms where distro packages are known to be problematic
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(e.g. Arch Linux ARM), the role deliberately avoids the system package
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and falls back to the official installer to ensure a working and
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up-to-date Nix installation.
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## Overview
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This role installs the Nix package manager via pacman on Arch x86_64 or via the official installer with SHA256 verification.
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## Cosmos
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The diagram places dev-nix in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).
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```mermaid
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flowchart LR
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subgraph role [dev-nix 💻]
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svc_nix["nix"]
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end
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```
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Solid `1:1` edges are fixed relationships; dashed `0..1` edges are conditional (enabled only in matching deployments); red `0..0` edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in `meta/main.yml`.
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## Installation Strategy
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The role automatically selects the appropriate installation method:
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- **Arch Linux (x86_64)**
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Installs `nix` via the system package manager (`pacman`).
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- **All other platforms** (including Arch Linux ARM, Debian, Ubuntu, Fedora, EL, Generic Linux)
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Uses the **official Nix installer** in multi-user (daemon) mode.
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This avoids ABI and SONAME mismatches on rolling or less frequently
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rebuilt distributions.
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## Security Model
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The official installer is **downloaded at runtime** and verified before execution:
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- The installer script is fetched from the official release location
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- Its SHA256 checksum is fetched from the same release
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- The checksum is validated **before** execution
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- Installation aborts immediately if verification fails
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No unverified code is executed on the target system.
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## Features
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- Automatic platform detection (Arch x86_64 vs others)
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- Verified official installer with SHA256 checksum validation
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- Multi-user (daemon) installation mode
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- Optional shell integration via `/etc/profile.d`
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- Optional activation of experimental features (`nix-command`, `flakes`)
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- Fully idempotent (safe to run multiple times)
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- Distro-agnostic fallback logic
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## Configuration Options
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Key variables (see `defaults/main.yml`):
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- `dev_nix_installer_version`
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Nix version to install via the official installer.
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- `dev_nix_enable_experimental_features`
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Enable experimental features such as `nix-command` and `flakes`.
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- `dev_nix_enable_shell_snippet`
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Whether to install a profile snippet for automatic environment loading.
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## Notes on Offline Usage
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This role **does not ship the installer script** and therefore requires
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network access during installation.
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If a fully offline or air-gapped setup is required, the role can be
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extended to use a locally vendored installer script with a pinned
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checksum.
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## Further Resources
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- Nix project: <https://nixos.org>
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- Nix releases: <https://releases.nixos.org>
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- Infinito.Nexus License: <https://s.infinito.nexus/license>
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## Credits
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Implemented by **[Kevin Veen-Birkenbach](https://www.veen.world)**.
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Part of the [Infinito.Nexus Project](https://s.infinito.nexus/code) and maintained by [Kevin Veen-Birkenbach](https://www.veen.world).
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Licensed under the [Infinito.Nexus Community License (Non-Commercial)](https://s.infinito.nexus/license).
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