Refactor initalization

#!/usr/bin/env bash

set -Eeuo pipefail

# Docker environment variables

: ${BOOT:=''}           # URL of the ISO file

: ${DEBUG:='N'}         # Enable debugging mode

: ${ALLOCATE:='Y'}      # Preallocate diskspace

: ${ARGUMENTS:=''}      # Extra QEMU parameters

: ${CPU_CORES:='1'}     # Amount of CPU cores

: ${DISK_SIZE:='16G'}   # Initial data disk size

: ${RAM_SIZE:='512M'}   # Maximum RAM amount

echo "❯ Starting QEMU for Docker v${VERSION}..."

echo "❯ For support visit https://github.com/qemu-tools/qemu-docker/"

info () { echo -e "\E[1;34m❯ \E[1;36m$1\E[0m" ; }

error () { echo -e >&2 "\E[1;31m❯ ERROR: $1\E[0m" ; }

trap 'error "Status $? while: ${BASH_COMMAND} (line $LINENO/$BASH_LINENO)"' ERR

[ ! -f "/run/entry.sh" ] && error "Script must run inside Docker container!" && exit 11

[ "$(id -u)" -ne "0" ] && error "Script must be executed with root privileges." && exit 12

KERNEL=$(uname -r | cut -b 1)

MINOR=$(uname -r | cut -d '.' -f2)

ARCH=$(dpkg --print-architecture)

VERS=$(qemu-system-x86_64 --version | head -n 1 | cut -d '(' -f 1)

STORAGE="/storage"

[ ! -d "$STORAGE" ] && error "Storage folder (${STORAGE}) not found!" && exit 13

cd /run

. reset.sh      # Initialize system

. install.sh    # Get bootdisk

. disk.sh       # Initialize disks

. display.sh    # Initialize display

. network.sh    # Initialize network

KVM_ERR=""

KVM_OPTS=""

if [ -e /dev/kvm ] && sh -c 'echo -n > /dev/kvm' &> /dev/null; then

  if ! grep -q -e vmx -e svm /proc/cpuinfo; then

    KVM_ERR="(vmx/svm disabled)"

  fi

else

  [ -e /dev/kvm ] && KVM_ERR="(no write access)" || KVM_ERR="(device file missing)"

fi

if [ -n "${KVM_ERR}" ]; then

  if [ "$ARCH" == "amd64" ]; then

    error "KVM acceleration not detected ${KVM_ERR}, see the FAQ about this."

    [[ "${DEBUG}" != [Yy1]* ]] && exit 88

  fi

else

  KVM_OPTS=",accel=kvm -enable-kvm -cpu host"

fi

DEF_OPTS="-nodefaults"

RAM_OPTS=$(echo "-m ${RAM_SIZE}" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')

CPU_OPTS="-smp ${CPU_CORES},sockets=1,dies=1,cores=${CPU_CORES},threads=1"

MAC_OPTS="-machine type=q35,usb=off,dump-guest-core=off,hpet=off${KVM_OPTS}"

SERIAL_OPTS="-serial mon:stdio -device virtio-serial-pci,id=virtio-serial0,bus=pcie.0,addr=0x3"

EXTRA_OPTS="-device virtio-balloon-pci,id=balloon0 -object rng-random,id=rng0,filename=/dev/urandom -device virtio-rng-pci,rng=rng0"

ARGS="${DEF_OPTS} ${CPU_OPTS} ${RAM_OPTS} ${MAC_OPTS} ${SERIAL_OPTS} ${NET_OPTS} ${DISK_OPTS} ${DISPLAY_OPTS} ${EXTRA_OPTS} ${ARGUMENTS}"

ARGS=$(echo "$ARGS" | sed 's/\t/ /g' | tr -s ' ')

. config.sh     # Configure arguments

trap - ERR

info "Booting image using ${VERS}..."