wagov-devcontainer 0.1.0

Provision the wagov devcontainer toolchain with pyinfra

Cloud Native Devcontainer

Production-ready development container with modern tooling for cloud-native and infrastructure development.

What's Inside

Languages: Go, Node.js, Python, Rust (via cargo-binstall), uv, pnpm
Cloud: AWS CLI, Terraform, Kubernetes (kubectl, k9s, k3d, helm, kustomize)
Development: Docker-from-Docker, git, just, mise, direnv, starship, zellij, neovim, lazygit
Security: Trivy, Semgrep, cosign, SLSA verifier, lychee (link checker)
Utilities: ripgrep, fzf, jq, yq, httpie, hurl, btop, restic, rclone

Complete list: See src/wagov_devcontainer/spec.py and src/wagov_devcontainer/deploy.py

Quick Start

VS Code Devcontainer (Recommended)

Create .devcontainer/devcontainer.json:

{
  "name": "My Project",
  "image": "ghcr.io/wagov-dtt/devcontainer-base",
  "mounts": [
    "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind"
  ],
  "onCreateCommand": "docker-init.sh",
  "remoteEnv": {
    "LOCAL_WORKSPACE_FOLDER": "${localWorkspaceFolder}",
    "DOCKER_API_VERSION": "1.43"
  },
  "remoteUser": "vscode"
}

Open in VS Code: Cmd/Ctrl+Shift+P → "Dev Containers: Reopen in Container"

Why these settings?

• Docker socket bind mount - Enables Docker via host socket (no privileged mode needed, Docker CLI pre-installed via extrepo)
• onCreateCommand - Runs baked-in docker-init.sh which fixes socket permissions
• DOCKER_API_VERSION - Caps Docker client API version for compatibility with older daemons (set to 1.43 for broad compatibility)
• LOCAL_WORKSPACE_FOLDER - Enables bind mounts from inside the container using host paths
• remoteUser: vscode - Correct user permissions

Docker CLI

# Basic usage (mount host Docker socket)
docker run -it --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  --group-add $(stat -c '%g' /var/run/docker.sock) \
  ghcr.io/wagov-dtt/devcontainer-base

# With your projects mounted
docker run -it --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  --group-add $(stat -c '%g' /var/run/docker.sock) \
  -v ~/projects:/workspaces \
  ghcr.io/wagov-dtt/devcontainer-base

Install on Existing System

# Preferred: run the published package directly
uvx wagov-devcontainer

# Or with pipx
pipx run --spec wagov-devcontainer wagov-devcontainer

# Repo helper script for Debian/Ubuntu
curl -sSL https://raw.githubusercontent.com/wagov-dtt/devcontainer-base/main/install.sh | sh

Use as Template

1. GitHub: Click "Use this template" to create your own repository
2. Codespaces: Works immediately - click "Code" → "Create codespace"
3. Local: Clone and customize as needed

CI/CD Integration

Run tests in the devcontainer for guaranteed consistency:

- name: Run tests in devcontainer
  uses: devcontainers/ci@v0.3
  with:
    imageName: local/devcontainer
    push: never
    runCmd: |
      just test
      mise run lint

See .github/workflows/test-devcontainer.yml for complete example.

How It Works

Architecture

• Base: Debian stable-backports (currently Trixie/13)
• Package Management: APT for system tools, mise for development tools
• Build: Python package (wagov-devcontainer) runs a pyinfra deploy during Docker build or local install
• Docker-from-Docker: Host socket bind mount (Docker CLI pre-installed via extrepo, no privileged mode needed)

Tool Sources

Tools are installed from two sources, preferring APT when available:

1. APT via extrepo (preferred) - Signed packages from official repos
   • Docker, GitHub CLI, Terraform, kubectl, mise
2. mise - Cross-platform tools not in APT, or needing version flexibility
   • Languages (Go, Node, Python), k9s, trivy, starship

Key Features

• Security: SBOM, signed images, Trivy scanning
• Performance: Multi-platform builds (amd64/arm64), layer caching
• Flexibility: mise auto-switches tool versions per project
• Supply Chain: Verified packages via extrepo

Adding Tools

Edit src/wagov_devcontainer/spec.py and add to the appropriate list:

MISE_TOOLS = (
    # Simple: just the tool name (defaults to latest)
    + ["pipx:your-tool"]  # or npm:, cargo:, github:user/repo

    # Complex: tuple with TOML config string
    + [("pipx:tool", '{ version = "latest", extras = "extra", uvx_args = "--with dep" }')]
)

For provisioning behaviour, edit src/wagov_devcontainer/deploy.py. Then rebuild: just build

See CONTRIBUTING.md for contributor guidance.

Optional Cloud CLIs

GCP CLI and Azure CLI are not installed by default (saves ~1 GB). Install them when needed:

# GCP CLI (repo already enabled via extrepo)
sudo apt-get update && sudo apt-get install -y google-cloud-cli

# Azure CLI (repo not available for Trixie, use pipx)
pipx install azure-cli

Development Commands

just              # List all commands
just build        # Build test image
just test         # Test Docker-from-Docker
just dev          # Interactive shell
just scan         # Security scan with Trivy
just lint         # Format and lint Python sources
just clean        # Clean up images

For maintainers:

just publish      # Multi-platform build + push
just shell        # Run published image interactively

Troubleshooting

Issue	Solution
Docker not working	Ensure Docker socket is available on the host
Tool missing	Check src/wagov_devcontainer/spec.py
Build fails	Run just clean then just build
Permission errors	User should be in docker group (automatic)
mise issues	Run mise doctor inside container

Contributing

1. Fork and clone the repo
2. Make changes to src/wagov_devcontainer/, Dockerfile, or docs
3. Test: just build && just test && just dev
4. Submit PR with test results

What to contribute:

• New tools or tool updates
• Documentation improvements
• Bug fixes
• Performance optimisations

See CONTRIBUTING.md for contributor guidance and project philosophy.