testkernel

#!/bin/sh

set -euo pipefail

KERNEL_IMAGE=""
INITRD_IMAGE=""
HDA_IMAGE=""
MEMORY="512M"
CONSOLE="ttyS0"
QEMU_CMD="qemu-system-x86_64"
ENABLE_KVM=true
ADDITIONAL_ARGS=()

print_usage() {
    cat << EOF
Usage: $0 -k <kernel> -i <initrd> -h <hda> [options]

Required:
  -k PATH    Kernel image path
  -i PATH    Initrd image path
  -h PATH    Disk image (HDA) path

Optional:
  -m MEM     Memory size (default $MEMORY)
  -c CONSOLE Console (default $CONSOLE)
  -n         Disable KVM
  -a ARGS    Additional QEMU arguments (quoted)
  -?         Show this help

Example:
  $0 -k bzImage -i initrd.img -h disk.img -m 1G -a "-net user -net nic"
EOF
}

parse_args() {
    while getopts ":k:i:h:m:c:na:?" opt; do
        case "$opt" in
            k) KERNEL_IMAGE="$OPTARG" ;;
            i) INITRD_IMAGE="$OPTARG" ;;
            h) HDA_IMAGE="$OPTARG" ;;
            m) MEMORY="$OPTARG" ;;
            c) CONSOLE="$OPTARG" ;;
            n) ENABLE_KVM=false ;;
            a) IFS=' ' read -r -a ADDITIONAL_ARGS <<< "$OPTARG" ;;
            ?) print_usage ; exit 0 ;;
            *) echo "Unknown option: -$opt" >&2; print_usage; exit 1 ;;
        esac
    done

    if [[ -z "$KERNEL_IMAGE" || -z "$INITRD_IMAGE" || -z "$HDA_IMAGE" ]]; then
        echo "Error: kernel, initrd, and hda are required." >&2
        print_usage
        exit 1
    fi
}

validate_files() {
    for f in "$KERNEL_IMAGE" "$INITRD_IMAGE" "$HDA_IMAGE"; do
        if [[ ! -f "$f" ]]; then
            echo "Error: File not found - $f" >&2
            exit 1
        fi
    done
}

build_qemu_command() {
    local -a cmd=("$QEMU_CMD")

    cmd+=(
        -kernel "$KERNEL_IMAGE"
        -initrd "$INITRD_IMAGE"
        -hda "$HDA_IMAGE"
        -append "console=$CONSOLE"
        -nographic
        -m "$MEMORY"
    )

    if $ENABLE_KVM; then
        cmd+=(-enable-kvm)
    fi

    if [[ ${#ADDITIONAL_ARGS[@]} -gt 0 ]]; then
        cmd+=("${ADDITIONAL_ARGS[@]}")
    fi

    echo "${cmd[@]}"
}

main() {
    parse_args "$@"
    validate_files

    local qemu_command
    qemu_command=$(build_qemu_command)

    echo "Starting QEMU with command:"
    echo "$qemu_command"
    exec $qemu_command
}

main "$@"