colima-start.sh

#!/bin/bash

usage() {
    echo "Usage: $0 [PERCENT]"
    echo "Start Colima with dynamically allocated memory and CPU"
    echo ""
    echo "Arguments:"
    echo "  PERCENT    Percentage of system memory and CPU to allocate (default: 75)"
    echo ""
    echo "Examples:"
    echo "  $0         # Use 75% of memory and CPU"
    echo "  $0 50      # Use 50% of memory and CPU"
    echo "  $0 90      # Use 90% of memory and CPU"
    exit 1
}

validate_percent() {
    local percent=$1
    if ! [[ "${percent}" =~ ^[0-9]+$ ]] || [[ "${percent}" -lt 1 ]] || [[ "${percent}" -gt 100 ]]; then
        echo "Error: Percent must be a number between 1 and 100" >&2
        exit 1
    fi
}


calculate_cpus() {
    local percent=$1
    local performance_cores
    performance_cores=$(sysctl -n hw.perflevel0.physicalcpu 2>/dev/null || sysctl -n hw.ncpu)
    local allocated_cpus=$((performance_cores * percent / 100))
    
    if [[ "${allocated_cpus}" -lt 1 ]]; then
        echo 1
    else
        echo "${allocated_cpus}"
    fi
}

calculate_memory() {
    local percent=$1
    local memory_bytes
    memory_bytes=$(sysctl -n hw.memsize)
    local memory_gb=$((memory_bytes / 1024 / 1024 / 1024))
    local allocated_memory=$((memory_gb * percent / 100))
    
    if [[ "${allocated_memory}" -lt 4 ]]; then
        echo 4
    else
        echo "${allocated_memory}"
    fi
}

start_colima() {
    local cpus=$1
    local memory=$2
    
    exec colima start \
        --vm-type=vz \
        --mount-type=virtiofs \
        --cpu "${cpus}" \
        --memory "${memory}"
}

main() {
    local percent=75
    
    if [[ $# -gt 1 ]]; then
        echo "Error: Too many arguments" >&2
        usage
    fi
    
    if [[ $# -eq 1 ]]; then
        if [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
            usage
        fi
        percent="$1"
    fi
    
    validate_percent "${percent}"
    
    local cpus
    cpus=$(calculate_cpus "${percent}")
    local memory
    memory=$(calculate_memory "${percent}")
    
    start_colima "${cpus}" "${memory}"
}

main "$@"