Erich Blume ba7236ade0 Add how-to guide for upgrading Dagger

Documents the correct two-phase upgrade procedure to avoid the
chicken-and-egg problem where CI can't build its own replacement.
Also fixes outdated version references in the Dagger reference card.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-06 20:31:30 -08:00

3.1 KiB

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Dagger

Build engine for BlumeOps CI/CD pipelines. Replaces shell-based build scripts with Python functions that run identically locally and in CI.

Quick Reference

Property	Value
Module	`blumeops-ci`
Engine Version	v0.19.11
SDK	Python
Source	`.dagger/src/blumeops_ci/main.py`
Config	`dagger.json`

Functions

Function	Signature	Description
`build`	`(src, container_name) → Container`	Build a container from `containers/<name>/Dockerfile`
`publish`	`(src, container_name, version, registry?) → str`	Build and push to registry (default: `registry.ops.eblu.me`)
`build_nix`	`(src, container_name) → File`	Build a nix container from `containers/<name>/default.nix`, return docker-archive tarball
`nix_version`	`(package) → str`	Extract the version of a nixpkgs package
`build_docs`	`(src, version) → File`	Build Quartz docs site, return docs tarball
`flake_lock`	`(src, flake_path?) → File`	Resolve flake inputs, return updated `flake.lock`
`flake_update`	`(src, flake_path?) → File`	Update all flake inputs to latest, return `flake.lock`

CLI Examples

# Build a container
dagger call build --src=. --container-name=devpi

# Drop into container shell for inspection
dagger call build --src=. --container-name=devpi terminal

# Debug a failure interactively
dagger call --interactive build --src=. --container-name=devpi

# Publish a container to zot
dagger call publish --src=. --container-name=devpi --version=v1.1.0

# Build a nix container (no local nix required)
dagger call build-nix --src=. --container-name=nettest export --path=./nettest.tar.gz

# Check a nixpkgs package version
dagger call nix-version --package=authentik

# Build docs tarball locally
dagger call build-docs --src=. --version=dev export --path=./docs-dev.tar.gz

# Debug a docs build failure
dagger call --interactive build-docs --src=. --version=dev

# Update all ringtail flake inputs
dagger call flake-update --src=. --flake-path=nixos/ringtail \
    export --path=nixos/ringtail/flake.lock

Secrets

Dagger has a first-class Secret type — values are never logged or cached. Pass secrets from environment variables using the env:VAR syntax:

dagger call release-docs \
  --src=. --version=v1.6.0 \
  --forgejo-token=env:FORGEJO_TOKEN \
  --argocd-token=env:ARGOCD_TOKEN

In forgejo Actions, secrets are injected as env vars. Locally, mise tasks call op read to populate them.

Caveats

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.
Privileged container — The Dagger engine requires privileged container access. The Forgejo runner's DinD sidecar provides this.

forgejo — CI/CD trigger layer
zot — Container registry (publish target)
docs — Documentation site (build target)
manage-lockfile — Ringtail flake lockfile management

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