Set OpenBSD screen resolution on Virtualbox

openbsd_vbox_resolution.sh

#!/bin/sh

# inspired by https://www.tumfatig.net/20190131/customized-resolution-for-openbsd-in-virtualbox/

if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run as root"
    exit 1
fi

mkdir -p /etc/X11/xorg.conf.d

cat << EOF > /etc/X11/xorg.conf.d/00-virtualbox-monitor.conf
Section "Device"
  Identifier   "VirtualBox-Card"
  Driver       "vesa"
  VendorName   "InnoTek"
  BoardName    "VirtualBox Graphics Adapter"
EndSection
Section "Monitor"
  Identifier   "VirtualBox-Monitor"
  VendorName   "InnoTek"
  ModelName    "VirtualBox Screen"
  HorizSync    1.0 - 1000.0
  VertRefresh  1.0 - 1000.0
EndSection
Section "Screen"
  Identifier   "VirtualBox-Screen"
  Device       "VirtualBox-Card"
  Monitor      "VirtualBox-Monitor"
  DefaultDepth 24
  SubSection "Display"
    Viewport   0 0
    Depth      24
    #Modes "1368x768" "1360x768" "1280x800" "1024x768"
    Modes  "$1"
  EndSubSection
EndSection
EOF

echo "Success - reboot your system"