Erich Blume
a529d60f60
Devpi now runs natively on indri (uv venv via ansible role), so the Dagger container build at containers/devpi/ is unused. Removing it. Also updated dagger.md examples to use 'miniflux' as the example container-name argument. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
104 lines
4 KiB
Markdown
104 lines
4 KiB
Markdown
---
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title: Dagger
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modified: 2026-04-11
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tags:
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- reference
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- ci-cd
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- dagger
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---
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# Dagger
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Build engine for BlumeOps CI/CD pipelines. Replaces shell-based build scripts with Python functions that run identically locally and in CI.
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## Quick Reference
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| Property | Value |
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|----------|-------|
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| **Module** | `blumeops` |
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| **Engine Version** | v0.20.6 |
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| **SDK** | Python |
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| **Source** | `src/blumeops/main.py` |
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| **Config** | `dagger.json` (source: `.`) |
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## Functions
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| Function | Signature | Description |
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|----------|-----------|-------------|
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| `build` | `(src, container_name) → Container` | Build a container — uses native pipeline (`container.py`) if available, falls back to `docker_build()` for Dockerfile containers |
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| `container_version` | `(container_name) → str` | Return the `VERSION` from a container's `container.py` (empty string if no `container.py`) |
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| `publish` | `(src, container_name, version, registry?) → str` | Build and push to registry (default: `registry.ops.eblu.me`) |
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| `build_nix` | `(src, container_name) → File` | Build a nix container from `containers/<name>/default.nix`, return docker-archive tarball |
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| `nix_version` | `(package) → str` | Extract the version of a nixpkgs package |
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| `build_docs` | `(src, version) → File` | Build Quartz docs site, return docs tarball |
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| `flake_lock` | `(src, flake_path?) → File` | Resolve flake inputs, return updated `flake.lock` |
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| `flake_update` | `(src, flake_path?) → File` | Update all flake inputs to latest, return `flake.lock` |
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## Container Build Types
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Containers can be built in three ways:
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| Build file | How it works | Error visibility |
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|------------|-------------|-----------------|
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| `container.py` | Native Dagger pipeline (preferred) | Full per-step output |
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| `Dockerfile` | `docker_build()` fallback (legacy) | Opaque — errors swallowed |
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| `default.nix` | `nix-build` on ringtail runner | Full nix output |
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New containers for indri (k8s runner) should use `container.py`. Ringtail containers should continue using `default.nix`. Existing Dockerfile containers are migrated incrementally during [[review-services|service reviews]]. See `containers/navidrome/container.py` for the reference pattern.
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## CLI Examples
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```bash
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# Build a container
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dagger call build --src=. --container-name=miniflux
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# Drop into container shell for inspection
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dagger call build --src=. --container-name=miniflux terminal
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# Debug a failure interactively
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dagger call --interactive build --src=. --container-name=miniflux
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# Publish a container to zot
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dagger call publish --src=. --container-name=miniflux --version=v1.1.0
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# Build a nix container (no local nix required)
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dagger call build-nix --src=. --container-name=ntfy export --path=./ntfy.tar.gz
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# Check a nixpkgs package version
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dagger call nix-version --package=authentik
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# Build docs tarball locally
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dagger call build-docs --src=. --version=dev export --path=./docs-dev.tar.gz
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# Debug a docs build failure
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dagger call --interactive build-docs --src=. --version=dev
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# Update all ringtail flake inputs
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dagger call flake-update --src=. --flake-path=nixos/ringtail \
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export --path=nixos/ringtail/flake.lock
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```
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## Secrets
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Dagger has a first-class `Secret` type — values are never logged or cached. Pass secrets from environment variables using the `env:VAR` syntax:
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```bash
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dagger call release-docs \
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--src=. --version=v1.6.0 \
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--forgejo-token=env:FORGEJO_TOKEN \
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--argocd-token=env:ARGOCD_TOKEN
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```
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In [[forgejo]] Actions, secrets are injected as env vars. Locally, mise tasks call `op read` to populate them.
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## Caveats
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- **Pre-1.0 API** — Current version is v0.20.x. Pin the CLI version and test upgrades on a branch before adopting. See [[upgrade-dagger]] for the upgrade procedure.
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- **Privileged container** — The Dagger engine requires privileged container access. The Forgejo runner's DinD sidecar provides this.
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## Related
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- [[forgejo]] — CI/CD trigger layer
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- [[zot]] — Container registry (publish target)
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- [[docs]] — Documentation site (build target)
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- [[manage-lockfile]] — Ringtail flake lockfile management
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