OSX-KVM/scripts/create_dmg_highsierra.sh

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#!/usr/bin/env bash
# Create a "ISO" (DMG) image for powering offline macOS installations
# Bail at first ISO creation error
set -e
display_help() {
echo "Usage: $(basename $0) [-h] [<path/to/install_app.app> <path/to/output_iso_file.iso>]"
exit 0
}
if [ "$1" == "-h" ] ; then
display_help
fi
if [ "$#" -eq 2 ]
then
in_path=$1
dmg_path=$2
elif [ "$#" -eq 0 ]
then
in_path=/Applications/Install\ macOS\ High\ Sierra.app
dmg_path=~/Desktop/HighSierra.dmg
echo "Using default paths:"
echo "Install app: $in_path"
echo "Output disk: $dmg_path"
else
display_help
fi
# Borrrowed from multiple internet sources
hdiutil create -o "$dmg_path" -size 5600m -layout GPTSPUD -fs HFS+J
hdiutil attach "$dmg_path" -noverify -mountpoint /Volumes/install_build
sudo "$in_path/Contents/Resources/createinstallmedia" --volume /Volumes/install_build --nointeraction
# createinstallmedia may leave a bunch of subvolumes still mounted when it exits, so we need to use -force here.
hdiutil detach -force "/Volumes/Install macOS High Sierra"