mk_mojave_beta_iso.sh

#!/bin/sh
#
# Created 18H28
#

if [ $# -ne 1 ]; then
    echo "`basename $0` installer_app"
    exit 1
fi

set -e

OSX_APP="$1"
VOL_BUILD="/Volumes/install_build"
IMG_CDR="/tmp/Mojave_beta.cdr"
ISO_NAME="Mojave_beta.iso"

if [ ! -d "$OSX_APP" ]; then
	echo "$OSX_APP not directory"
	exit 1
fi

if [ ! -f "$OSX_APP"/Contents/Resources/createinstallmedia ]; then
	echo "createinstallmedia not found in $OSX_APP"
	exit 2
fi

# Cache sudo in advance
sudo true

hdiutil create -o $IMG_CDR -size 6g -layout SPUD -fs HFS+J
hdiutil attach ${IMG_CDR}.dmg -noverify -nobrowse -mountpoint $VOL_BUILD
sudo "$OSX_APP"/Contents/Resources/createinstallmedia \
        --volume $VOL_BUILD --nointeraction
hdiutil detach "/Volumes/Install macOS Mojave Beta"
hdiutil convert ${IMG_CDR}.dmg -format UDTO -o /tmp/$ISO_NAME
mv /tmp/${ISO_NAME}.cdr ~/Desktop/$ISO_NAME
rm ${IMG_CDR}.dmg