Add comprehensive documentation for all project sections

Introduced new and updated documentation files across the docs/ directory, including project structure guides, function library references, and standardized READMEs for ct, install, vm, tools, api, and misc. This update fully documents all nine function libraries, provides quick start and learning paths, and mirrors the project structure for easier navigation and contribution.
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# tools.func Functions Reference
Complete alphabetical reference of all functions in tools.func with parameters, usage, and examples.
## Function Index
### Package Management
- `pkg_install()` - Install packages safely with retry
- `pkg_update()` - Update package lists with retry
- `pkg_remove()` - Remove packages cleanly
### Repository Management
- `setup_deb822_repo()` - Add repository in modern deb822 format
- `cleanup_repo_metadata()` - Clean GPG keys and old repositories
- `check_repository()` - Verify repository accessibility
### Tool Installation Functions (30+)
**Programming Languages**:
- `setup_nodejs(VERSION)` - Install Node.js and npm
- `setup_php(VERSION)` - Install PHP-FPM and CLI
- `setup_python(VERSION)` - Install Python 3 with pip
- `setup_ruby(VERSION)` - Install Ruby with gem
- `setup_golang(VERSION)` - Install Go programming language
**Databases**:
- `setup_mariadb(VERSION)` - Install MariaDB server
- `setup_postgresql(VERSION)` - Install PostgreSQL
- `setup_mongodb(VERSION)` - Install MongoDB
- `setup_redis(VERSION)` - Install Redis cache
**Web Servers**:
- `setup_nginx()` - Install Nginx
- `setup_apache()` - Install Apache HTTP Server
- `setup_caddy()` - Install Caddy
- `setup_traefik()` - Install Traefik proxy
**Containers**:
- `setup_docker()` - Install Docker
- `setup_podman()` - Install Podman
**Development**:
- `setup_git()` - Install Git
- `setup_docker_compose()` - Install Docker Compose
- `setup_composer()` - Install PHP Composer
- `setup_build_tools()` - Install build-essential
**Monitoring**:
- `setup_grafana()` - Install Grafana
- `setup_prometheus()` - Install Prometheus
- `setup_telegraf()` - Install Telegraf
**System**:
- `setup_wireguard()` - Install WireGuard VPN
- `setup_netdata()` - Install Netdata monitoring
- `setup_tailscale()` - Install Tailscale
- (+ more...)
---
## Core Functions
### pkg_install()
Install one or more packages safely with automatic retry logic and error handling.
**Signature**:
```bash
pkg_install PACKAGE1 [PACKAGE2 ...]
```
**Parameters**:
- `PACKAGE1, PACKAGE2, ...` - Package names to install
**Returns**:
- `0` - All packages installed successfully
- `1` - Installation failed after retries
**Environment Variables**:
- `$STD` - Output suppression (`silent` or empty)
**Example**:
```bash
pkg_install curl wget git
```
---
### pkg_update()
Update package lists with automatic retry logic for network failures.
**Signature**:
```bash
pkg_update
```
**Parameters**: None
**Returns**:
- `0` - Package lists updated
- `1` - Failed after 3 retries
**Example**:
```bash
pkg_update
```
---
### pkg_remove()
Remove packages completely including dependencies.
**Signature**:
```bash
pkg_remove PACKAGE1 [PACKAGE2 ...]
```
**Parameters**:
- `PACKAGE1, PACKAGE2, ...` - Package names to remove
**Returns**:
- `0` - Packages removed
- `1` - Removal failed
**Example**:
```bash
pkg_remove old-package outdated-tool
```
---
### setup_deb822_repo()
Add repository in modern deb822 format (recommended over legacy format).
**Signature**:
```bash
setup_deb822_repo REPO_URL NAME DIST MAIN_URL RELEASE
```
**Parameters**:
- `REPO_URL` - URL to GPG key (e.g., https://example.com/key.gpg)
- `NAME` - Repository name (e.g., "nodejs")
- `DIST` - Distribution (jammy, bookworm, etc.)
- `MAIN_URL` - Main repository URL
- `RELEASE` - Release type (main, testing, etc.)
**Returns**:
- `0` - Repository added successfully
- `1` - Repository setup failed
**Example**:
```bash
setup_deb822_repo \
"https://deb.nodesource.com/gpgkey/nodesource.gpg.key" \
"nodejs" \
"jammy" \
"https://deb.nodesource.com/node_20.x" \
"main"
```
---
### cleanup_repo_metadata()
Clean up GPG keys and old repository configurations.
**Signature**:
```bash
cleanup_repo_metadata
```
**Parameters**: None
**Returns**:
- `0` - Cleanup complete
**Example**:
```bash
cleanup_repo_metadata
```
---
## Tool Installation Functions
### setup_nodejs(VERSION)
Install Node.js and npm from official repositories.
**Signature**:
```bash
setup_nodejs VERSION
```
**Parameters**:
- `VERSION` - Node.js version (e.g., "20", "22", "lts")
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/opt/nodejs_version.txt` - Version file
**Example**:
```bash
setup_nodejs "20"
```
---
### setup_php(VERSION)
Install PHP-FPM, CLI, and common extensions.
**Signature**:
```bash
setup_php VERSION
```
**Parameters**:
- `VERSION` - PHP version (e.g., "8.2", "8.3")
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/opt/php_version.txt` - Version file
**Example**:
```bash
setup_php "8.3"
```
---
### setup_mariadb(VERSION)
Install MariaDB server and client utilities.
**Signature**:
```bash
setup_mariadb VERSION
```
**Parameters**:
- `VERSION` - MariaDB version (e.g., "10.6", "11.0")
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/opt/mariadb_version.txt` - Version file
**Example**:
```bash
setup_mariadb "11.0"
```
---
### setup_postgresql(VERSION)
Install PostgreSQL server and client utilities.
**Signature**:
```bash
setup_postgresql VERSION
```
**Parameters**:
- `VERSION` - PostgreSQL version (e.g., "14", "15", "16")
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/opt/postgresql_version.txt` - Version file
**Example**:
```bash
setup_postgresql "16"
```
---
### setup_docker()
Install Docker and Docker CLI.
**Signature**:
```bash
setup_docker
```
**Parameters**: None
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/opt/docker_version.txt` - Version file
**Example**:
```bash
setup_docker
```
---
### setup_composer()
Install PHP Composer (dependency manager).
**Signature**:
```bash
setup_composer
```
**Parameters**: None
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Creates**:
- `/usr/local/bin/composer` - Composer executable
**Example**:
```bash
setup_composer
```
---
### setup_build_tools()
Install build-essential and development tools (gcc, make, etc.).
**Signature**:
```bash
setup_build_tools
```
**Parameters**: None
**Returns**:
- `0` - Installation successful
- `1` - Installation failed
**Example**:
```bash
setup_build_tools
```
---
## System Configuration
### setting_up_container()
Display setup message and initialize container environment.
**Signature**:
```bash
setting_up_container
```
**Example**:
```bash
setting_up_container
# Output: ⏳ Setting up container...
```
---
### motd_ssh()
Configure SSH daemon and MOTD for container.
**Signature**:
```bash
motd_ssh
```
**Example**:
```bash
motd_ssh
# Configures SSH and creates MOTD
```
---
### customize()
Apply container customizations and final setup.
**Signature**:
```bash
customize
```
**Example**:
```bash
customize
```
---
### cleanup_lxc()
Final cleanup of temporary files and logs.
**Signature**:
```bash
cleanup_lxc
```
**Example**:
```bash
cleanup_lxc
# Removes temp files, finalizes installation
```
---
## Usage Patterns
### Basic Installation Sequence
```bash
#!/usr/bin/env bash
source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
pkg_update # Update package lists
setup_nodejs "20" # Install Node.js
setup_mariadb "11" # Install MariaDB
# ... application installation ...
motd_ssh # Setup SSH/MOTD
customize # Apply customizations
cleanup_lxc # Final cleanup
```
### Tool Chain Installation
```bash
#!/usr/bin/env bash
source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
# Install full web stack
pkg_update
setup_nginx
setup_php "8.3"
setup_mariadb "11"
setup_composer
```
### With Repository Setup
```bash
#!/usr/bin/env bash
source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
pkg_update
# Add Node.js repository
setup_deb822_repo \
"https://deb.nodesource.com/gpgkey/nodesource.gpg.key" \
"nodejs" \
"jammy" \
"https://deb.nodesource.com/node_20.x" \
"main"
pkg_update
setup_nodejs "20"
```
---
**Last Updated**: December 2025
**Total Functions**: 30+
**Maintained by**: community-scripts team