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blumeops/docs/how-to/zot/install-dagger-on-nix-runner.md
Erich Blume 96a2d420fb Update install-dagger-on-nix-runner card with actual resolution 
Dagger can't run on the bare nix runner (needs container runtime).
Used nix eval directly instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-20 23:23:06 -08:00

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Install Dagger on Nix Runner 2026-02-20
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zot

Install Dagger on Nix Runner

Use nix eval instead of dagger call nix-version for version extraction on the ringtail nix-container-builder runner.

Context

The build-container-nix.yaml workflow extracts container versions in this order:

  1. version = "..." from default.nix (e.g. ntfy)
  2. ARG CONTAINER_APP_VERSION= from Dockerfile (e.g. nettest)
  3. Nixpkgs package version for packages without explicit versions (e.g. authentik)

Step 3 originally used dagger call nix-version, but dagger can't run on the bare nix runner:

  • Dagger is not in nixpkgs — removed due to trademark concerns. Available via github:dagger/nix flake.
  • Dagger needs a container runtime — the CLI is just an API client; the engine runs as a container via Docker/containerd, which the nix runner doesn't have.

The fix was to use nix eval --raw "nixpkgs#<package>.version" directly, which is already available on the nix host and more appropriate.

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