mkdir -p my-addon/{rootfs,rootfs/etc/s6-overlay/s6-rc.d/service-name}
cd my-addon

---
name: My Custom Add-On
description: My awesome Home Assistant add-on
version: 1.0.0
slug: my-addon
image: ghcr.io/home-assistant/{arch}-addon-my-addon
arch:
  - amd64
  - armv7
  - aarch64
ports:
  8080/tcp: null
options:
  debug: false
schema:
  debug: bool
permissions:
  - homeassistant  # Read/write Home Assistant core data

FROM ghcr.io/home-assistant/amd64-base:latest

# Install dependencies
RUN apk add --no-cache python3 py3-pip

# Copy application
COPY rootfs /

# Set working directory
WORKDIR /app

# Install Python packages if needed
RUN if [ -f requirements.txt ]; then pip install -r requirements.txt; fi

# Run using S6 overlay
CMD ["/init"]

#!/command/execlineb -P
foreground { echo "Starting my add-on..." }
/app/my-service

chmod +x rootfs/etc/s6-overlay/s6-rc.d/service-name/run

#!/bin/bash
CONFIG_PATH="/config/my-addon"

#!/command/execlineb -P
CONFIG_PATH=${"$(bashio::addon::config_path)"}

---
name: String                          # Display name
description: String                   # Short description
version: String                       # Semantic version (1.0.0)
slug: String                          # URL-safe identifier
image: String                         # Docker image URL with {arch} placeholder
arch:
  - amd64|armv7|aarch64|armhf|i386    # Supported architectures
ports:
  8080/tcp: null                      # TCP port (null=internal only, number=external)
  53/udp: 53                          # UDP with external port mapping
devices:
  - /dev/ttyACM0                      # Device access
services:
  - mysql                             # Depends on other service
options:
  debug: false                        # User configuration options
  log_level: info
schema:
  debug: bool                         # Configuration validation schema
  log_level:
    - debug
    - info
    - warning
    - error
permissions:
  - homeassistant                     # Read/write HA config
  - hassio                            # Full supervisor API access
  - admin                             # Broad system access
  - backup                            # Backup/restore operations
environment:
  NODE_ENV: production
webui: http://[HOST]:[PORT:8080]     # Web UI URL pattern
ingress: true                         # Enable ingress proxy
ingress_port: 8080                    # Internal port for ingress
ingress_entry: /                      # URL path for ingress entry

#!/command/execlineb -P
foreground { bashio::log::info "Add-on started" }
foreground { bashio::log::warning "Low disk space" }
foreground { bashio::log::error "Failed to connect" }

#!/command/execlineb -P
define DEBUG "$(bashio::addon::option 'debug')"
define LOG_LEVEL "$(bashio::addon::option 'log_level')"
if { test "${DEBUG}" = "true" }
  bashio::log::debug "Debug mode enabled"

#!/bin/bash
# Get addon info
curl -X GET \
  -H "Authorization: Bearer $SUPERVISOR_TOKEN" \
  http://supervisor/addons/self/info | jq .

# Send notification
curl -X POST \
  -H "Authorization: Bearer $SUPERVISOR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"message":"Warning message"}' \
  http://supervisor/notifications/create

build_from:
  amd64: ghcr.io/home-assistant/amd64-base:latest
  armv7: ghcr.io/home-assistant/armv7-base:latest
  aarch64: ghcr.io/home-assistant/aarch64-base:latest
  armhf: ghcr.io/home-assistant/armhf-base:latest
codenotary: your-notary-id  # Optional code signing

ingress: true
ingress_port: 8080
ingress_entry: /
# Optional ingress_stream for streaming endpoints

# nginx configuration in your app
location / {
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header Host $host;
  proxy_pass http://localhost:8080;
}

# Authentication: Pass SUPERVISOR_TOKEN header
# Base URL: http://supervisor

GET /addons/self/info            # Get current add-on details
POST /addons/self/restart        # Restart this add-on
GET /addons/installed            # List installed add-ons
GET /info                        # System information
POST /notifications/create       # Send notification to user
GET /config/homeassistant        # Read Home Assistant config

# Example with bashio
bashio::addon::self_info         # Helper function for self info

# Check logs
docker logs addon_name_latest  # Or use HA UI: Settings > System > Logs

# Common causes:
# 1. Invalid config.yaml syntax
# 2. Missing S6 service files
# 3. Dockerfile can't find base image
# 4. Permission denied on rootfs files

# Verify SUPERVISOR_TOKEN is set
echo $SUPERVISOR_TOKEN

# Check add-on logs for token errors
# Token is automatically injected by Home Assistant

# Verify permissions in config.yaml
# If calling hassio endpoints, add: permissions: [hassio]

# Always save to /data/ or use bashio
CONFIG_PATH="$(bashio::addon::config_path)"  # Returns /data/
echo "my_value=123" > "${CONFIG_PATH}/settings.json"

# Verify /data/ exists and is writable
ls -la /data/

# 1. Verify service is listening on correct port
netstat -tlnp | grep 8080

# 2. Check reverse proxy headers in app config
# X-Forwarded-For, X-Forwarded-Proto must be set

# 3. Verify ingress settings in config.yaml
ingress: true
ingress_port: 8080
ingress_entry: /

# Check config.yaml has valid arch values
arch:
  - amd64      # x86 64-bit
  - armv7      # 32-bit ARM (Pi 2/3)
  - aarch64    # 64-bit ARM (Pi 4+)
  - armhf      # 32-bit ARM (older devices)
  - i386       # 32-bit x86 (rare)

# Dockerfile must use {arch} placeholder
FROM ghcr.io/home-assistant/{arch}-base:latest

mkdir my-addon-repo
cd my-addon-repo

---
name: My Add-On Repository
url: https://github.com/username/my-addon-repo
maintainer: Your Name <email@example.com>

my-addon-repo/
├── repository.yaml
├── my-addon-1/
│   ├── config.yaml
│   ├── Dockerfile
│   └── rootfs/
└── my-addon-2/
    ├── config.yaml
    ├── Dockerfile
    └── rootfs/

# Build and push for all architectures
docker buildx build \
  --platform linux/amd64,linux/arm/v7,linux/arm64/v8 \
  -t ghcr.io/username/my-addon:1.0.0 \
  --push .