hass-devcontainer

Devcontainer for the development of Lovelace cards and custom components for Home Assistant.

Features:

1. HA Components
   • automatic download of third-party Lovelace cards from Github
   • automatic generation of Lovelace resources list (with your cards included)
   • HACS is preinstalled
   • automatic download of custom components from git
   • automatic creation of symlinks from custom_components to your code
2. Running HA
   • instantaneous startup because dependencies are already installed
   • colored logs
   • restart HA with a simple key press
   • ready-for-attach debug adapter is listening on port 5678
3. Development tools
   • Playwright dependencies & browsers
   • poetry and poethepoet
   • node.js 16 (with nvm)
   • sqlite3 cli

Custom component example

.devcontainer/devcontainer.json

{
    "image": "gwisp2/hass-devcontainer:latest",
    "postStartCommand": "hactl run",
    "forwardPorts": [
        8123
    ],
    "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind",
    "workspaceFolder": "/workspace",
    "mounts": [
        // hactl configuration
        "source=${localWorkspaceFolder}/.devcontainer/hactl.yaml,target=/etc/hactl.yaml,type=bind",
        // HA configuration.yaml
        "source=${localWorkspaceFolder}/.devcontainer/configuration.yaml,target=/hdata/configuration.yaml,type=bind"
    ],
    "extensions": [
        "ms-python.python"
    ]
}

.devcontainer/hactl.yaml

components:
- path: /workspace/custom_components/time_machine

.devcontainer/configuration.yaml

default_config:

time_machine:

input_boolean:
  hallway_light:
  room_light:
  kitchen_light:

HA credentials

dev:dev

Paths

Path	Purpose
/hdata	HA data (aka config) directory
/henv	venv where HA is installed
/hactl/.venv	venv where hactl is installed, hactl is an utility that controls HA
/usr/bin/hactl	hactl symlink, links to hactl executable inside venv

Probably you want to mount configuration.yaml or ui-lovelace.yaml inside /hdata.

Debugging

hactl always starts debugpy that can be attached from VS Code. Use --wait-for-debugger if you need to attach debugger before startup.

Warning: enable 'Debug: Show Sub Sessions In Tool Bar' in VS Code settings, VS Code is buggy without that flag.

Warning: your component code is accessed through a symlink, configure path mappings or your breakpoints won't work.

.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python: attach",
            "type": "python",
            "request": "attach",
            "connect": {
                "host": "localhost",
                "port": 5678
            },
            "justMyCode": false
        }
    ]
}