ServerManagementUtils/share/os-detection.sh

#!/bin/bash

# OS Detection and Path Configuration
# This script provides OS-specific paths and configurations

# Detect OS
DetectOS() {
    if [[ "$OSTYPE" == "darwin"* ]]; then
        echo "macos"
    elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
        echo "linux"
    else
        echo "unknown"
    fi
}

# Get config directory for Filebeat
GetFilebeatConfigDir() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            echo "/usr/local/etc/filebeat"
            ;;
        linux)
            echo "/etc/filebeat"
            ;;
        *)
            echo "/etc/filebeat"
            ;;
    esac
}

# Get config directory for Metricbeat
GetMetricbeatConfigDir() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            echo "/usr/local/etc/metricbeat"
            ;;
        linux)
            echo "/etc/metricbeat"
            ;;
        *)
            echo "/etc/metricbeat"
            ;;
    esac
}

# Get config directory for Logstash
GetLogstashConfigDir() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # Homebrew installation path
            echo "/usr/local/etc/logstash"
            ;;
        linux)
            echo "/etc/logstash"
            ;;
        *)
            echo "/etc/logstash"
            ;;
    esac
}

# Get logrotate/newsyslog config directory
GetLogRotateConfigDir() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # macOS uses newsyslog instead of logrotate
            echo "/usr/local/etc/newsyslog.d"
            ;;
        linux)
            echo "/etc/logrotate.d"
            ;;
        *)
            echo "/etc/logrotate.d"
            ;;
    esac
}

# Check if logrotate is available
IsLogRotateAvailable() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # macOS uses newsyslog
            command -v newsyslog &> /dev/null
            ;;
        linux)
            command -v logrotate &> /dev/null
            ;;
        *)
            command -v logrotate &> /dev/null
            ;;
    esac
}

# Get log rotation command
GetLogRotateCommand() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            echo "newsyslog"
            ;;
        linux)
            echo "logrotate"
            ;;
        *)
            echo "logrotate"
            ;;
    esac
}

# Check if thermal monitoring is supported
IsThermalMonitoringSupported() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # Check if osx-cpu-temp or powermetrics is available
            # Check both PATH and common install locations
            command -v osx-cpu-temp &> /dev/null || [[ -x /usr/local/bin/osx-cpu-temp ]] || [[ -x /usr/bin/powermetrics ]]
            ;;
        linux)
            # Check if thermal zones exist
            [[ -e /sys/class/thermal/thermal_zone0/type ]]
            ;;
        *)
            return 1
            ;;
    esac
}

# Check if power monitoring is supported
IsPowerMonitoringSupported() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # powermetrics requires sudo and is available on all recent macOS versions
            [[ -x /usr/bin/powermetrics ]]
            ;;
        linux)
            # Check if Intel RAPL is available
            [[ -r /sys/class/powercap/intel-rapl:0/energy_uj ]]
            ;;
        *)
            return 1
            ;;
    esac
}

# Get OS-specific df flags for disk usage
GetDfFlags() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            # macOS df doesn't support --output flag
            echo ""
            ;;
        linux)
            echo "--output=target,used,size -B1"
            ;;
        *)
            echo ""
            ;;
    esac
}

# Get service management command (systemctl vs launchctl)
GetServiceCommand() {
    local os=$(DetectOS)
    case "$os" in
        macos)
            echo "brew services"
            ;;
        linux)
            echo "systemctl"
            ;;
        *)
            echo "systemctl"
            ;;
    esac
}

# Export functions for sourcing
export -f DetectOS
export -f GetFilebeatConfigDir
export -f GetMetricbeatConfigDir
export -f GetLogstashConfigDir
export -f GetLogRotateConfigDir
export -f IsLogRotateAvailable
export -f GetLogRotateCommand
export -f IsThermalMonitoringSupported
export -f IsPowerMonitoringSupported
export -f GetDfFlags
export -f GetServiceCommand