---

name: swizzin-scripts-patterns description: Coding patterns extracted from swizzin-scripts repository for Swizzin installer scripts version: 1.0.0 source: local-git-analysis analyzed_commits: 187 date_range: 2025-12-19 to 2026-01-30

Swizzin Scripts Patterns

This skill teaches Claude the coding patterns, conventions, and workflows used in this repository of Swizzin installer scripts.

Commit Conventions

This project uses imperative mood commits with action prefixes:

Prefix	Usage	Frequency
Fix	Bug fixes and corrections	45 commits (24%)
Add	New features, files, or capabilities	57 commits (30%)
Update	Modifications to existing features	11 commits (6%)
Remove	Deletions and cleanup	5 commits (3%)

Examples of good commit messages:

• Fix LibreTranslate container permission error
• Add subdomain support to Lingarr installer
• Update docs for subgen Python 3.11 and GPU auto-detection
• Fix Lingarr: host networking, UrlBase support, remove broken auth rules

Anti-patterns to avoid:

• Past tense: "Fixed" → use "Fix"
• Vague descriptions: "Updates" → be specific about what changed
• No prefix: Always start with an action word

Code Architecture

swizzin-scripts/
├── *.sh                      # Main installer scripts
├── templates/                # Starter templates for new scripts
│   ├── template-binary.sh    # Single binary apps → /usr/bin
│   ├── template-python.sh    # Python/uv apps → /opt
│   ├── template-docker.sh    # Docker Compose apps → /opt
│   ├── template-subdomain.sh # Extended installers with subdomain
│   └── template-multiinstance.sh  # Multi-instance managers
├── panel_helpers.sh          # Shared panel integration utilities
├── backup/                   # BorgBackup system
├── watchdog/                 # Service health monitoring
├── configs/                  # Example configuration files
├── docs/plans/               # Design documents (YYYY-MM-DD-*-design.md)
├── CLAUDE.md                 # AI assistant context
└── README.md                 # User documentation

Script Categories

Type	Pattern	Binary Location	Examples
Single binary	template-binary.sh	/usr/bin/<app>	notifiarr, decypharr, cleanuparr
Python/uv	template-python.sh	/opt/<app>/	byparr, huntarr, subgen
Docker	template-docker.sh	/opt/<app>/	lingarr, libretranslate
Extended	template-subdomain.sh	varies	plex, emby, jellyfin, seerr
Multi-instance	template-multiinstance.sh	varies	sonarr, radarr, bazarr

Function Naming Convention

All internal functions use underscore prefix with pattern _<action>_<appname>():

_install_notifiarr()    # Main installation logic
_systemd_notifiarr()    # Create systemd service
_nginx_notifiarr()      # Create nginx config
_remove_notifiarr()     # Removal logic
_load_panel_helper()    # Load panel helper (standard)

Other common function names:

• _get_domain() / _prompt_domain() - Domain management
• _get_install_state() - Detect subfolder vs subdomain
• _create_subdomain_vhost() - Nginx subdomain config
• _validate_instance_name() - Input validation
• _ensure_base_installed() - Prerequisite checks

Script Structure Pattern

Every installer script follows this exact sequence:

#!/bin/bash
# <appname> installer
# STiXzoOR 2025
# Usage: bash <appname>.sh [--remove [--force]|--register-panel]

# 1. Source Swizzin utilities
. /etc/swizzin/sources/globals.sh
#shellcheck source=sources/functions/utils
. /etc/swizzin/sources/functions/utils

# 2. Panel helper (download and cache)
PANEL_HELPER_LOCAL="/opt/swizzin-extras/panel_helpers.sh"
PANEL_HELPER_URL="https://raw.githubusercontent.com/STiXzoOR/swizzin-scripts/main/panel_helpers.sh"
_load_panel_helper() { ... }

# 3. Logging setup
export log=/root/logs/swizzin.log
touch "$log"

# 4. App configuration variables
app_name="myapp"
app_port=$(port 10000 12000)
app_dir="/usr/bin"  # or /opt/myapp
app_configdir="/home/${user}/.config/Myapp"
app_icon_url="https://cdn.jsdelivr.net/gh/selfhst/icons@main/png/myapp.png"

# 5. Owner resolution (from swizdb or master user)
if ! app_owner="$(swizdb get "${app_name}/owner" 2>/dev/null)"; then
    app_owner="$(_get_master_username)"
fi
user="${app_owner}"

# 6. Core functions
_install_myapp() { ... }
_systemd_myapp() { ... }
_nginx_myapp() { ... }
_remove_myapp() { ... }

# 7. Main logic (argument parsing)
case "$1" in
    --remove) _remove_myapp "$@" ;;
    --register-panel) _load_panel_helper && panel_register_app ... ;;
    *) _install_myapp && _systemd_myapp && _nginx_myapp && ... ;;
esac

Variable Quoting Standards

Always quote variables and use braces for clarity:

# CORRECT
touch "$log"
chown "${user}:${user}" "$config_dir"
mkdir -p "${app_dir}/${app_name}"
if [[ -f "$file" ]]; then

# INCORRECT
touch $log
chown $user:$user $config_dir
mkdir -p $app_dir/$app_name

Swizzin API Functions

Function	Purpose	Example
port <start> <end>	Allocate free port	app_port=$(port 10000 12000)
apt_install <pkgs>	Install apt packages	apt_install curl jq
swizdb get/set	Persistent storage	swizdb set "myapp/port" "$port"
_get_master_username	Primary Swizzin user	user=$(_get_master_username)
ask "question?" Y/N	Interactive prompt	if ask "Continue?" Y; then
echo_progress_start/done	Progress indicators	echo_progress_start "Installing"
echo_error/info/query	Status messages	echo_error "Failed to install"

Panel Registration Pattern

_load_panel_helper

panel_register_app \
    "$app_name" \
    "$app_port" \
    "$app_lockname" \
    "$app_baseurl" \
    "$app_icon_name" \
    "$app_icon_url"

Lock File Convention

• Location: /install/.<appname>.lock
• Created at end of successful install
• Checked before install to prevent duplicate installs
• Removed during uninstall

# Check if already installed
if [[ -f "/install/.${app_lockname}.lock" ]]; then
    echo_error "${app_name} is already installed"
    exit 1
fi

# Create lock file at end
touch "/install/.${app_lockname}.lock"

Nginx Configuration Patterns

Subfolder Mode (location block)

location /${app_name}/ {
    proxy_pass http://127.0.0.1:${app_port}/;
    proxy_http_version 1.1;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
}

Subdomain Mode (dedicated vhost)

• File: /etc/nginx/sites-available/<appname>
• Symlink: /etc/nginx/sites-enabled/<appname>
• Let's Encrypt via box install letsencrypt

Systemd Service Pattern

[Unit]
Description=${app_pretty}
After=network-online.target

[Service]
User=${user}
Group=${user}
Type=simple
ExecStart=${app_binary} --config ${app_configdir}/config.yml
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

For Docker apps:

Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/docker compose -f /opt/${app_name}/docker-compose.yml up -d
ExecStop=/usr/bin/docker compose -f /opt/${app_name}/docker-compose.yml down

Design Document Pattern

Before implementing complex features, create a design document:

• Location: docs/plans/YYYY-MM-DD-<feature>-design.md
• Include: Goal, Architecture, Tech Stack, Design Decisions table, File Layout, Tasks
• Reference: > **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans

Common Workflows

Adding a New Binary App

1. Copy templates/template-binary.sh to <appname>.sh
2. Search/replace myapp → yourapp, Myapp → Yourapp
3. Customize:
   • Architecture mapping in _install_<app>()
   • Config file format
   • Systemd service options
   • Nginx location config
4. Add entry to swizzin-app-info APP_CONFIGS
5. Update backup/restore scripts
6. Update README.md and CLAUDE.md

Adding Subdomain Support

1. Copy templates/template-subdomain.sh
2. Implement:
   • _get_domain() / _prompt_domain()
   • _create_subdomain_vhost()
   • _revert_subdomain()
3. Handle Organizr SSO exclusion if needed
4. Support --subdomain and --subdomain --revert flags

Fixing a Bug

1. Identify root cause in existing script
2. Make minimal change to fix
3. Test on Swizzin system
4. Commit with Fix <description> message

Testing Approach

• No automated tests; manual testing on Swizzin systems
• Test both install and remove paths
• Verify nginx config with nginx -t
• Check systemd status after install
• Confirm panel registration

Environment Variable Bypass

Scripts support automation via environment variables:

# Skip interactive prompts
<APP>_DOMAIN="app.example.com"
<APP>_LE_HOSTNAME="app.example.com"
<APP>_LE_INTERACTIVE="yes"  # for CloudFlare DNS
<APP>_OWNER="username"
DN_API_KEY="xxxxx"  # for notifiarr

Files Modified Together

Based on git history, these files change together:

Primary File	Co-changed Files
lingarr.sh	CLAUDE.md, README.md, templates/template-docker.sh
zurg.sh	bootstrap/lib/apps.sh, decypharr.sh
*.sh (new)	CLAUDE.md, README.md, swizzin-app-info
organizr.sh	Related subdomain scripts

Anti-Patterns to Avoid

1. Don't skip panel helper - Always include _load_panel_helper()
2. Don't hardcode ports - Use port 10000 12000
3. Don't use [ ] for complex tests - Prefer [[ ]]
4. Don't forget lock files - Both create and check
5. Don't commit without testing remove - Always verify cleanup
6. Don't use interactive flags with git - No -i for rebase/add
7. Don't echo to communicate - Use proper Swizzin functions