Fix detection of application and result existence

convert_osx_to_iso.sh

#!/usr/bin/env bash

# taken from http://www.fredmastro.com/?p=40


set -e # exit when some command fails


if [[ $# != 2 ]]; then
	echo "Usage: $0 <path-to-osx-install-application> <result-ios-path>" >&2
	exit 1
fi

app_path=$1
if [[ ! -d "$app_path" ]]; then
	echo "$0: path to application '$app_path' doesn't exist" >&2
	exit 1
fi

result_iso=$2
if [[ -f "$result_iso" ]]; then
	echo "$0: file at result path '$result_iso' already exist" >&2
	exit 1
fi


# Mount the installer image
hdiutil attach "${app_path}/Contents/SharedSupport/InstallESD.dmg" -noverify -nobrowse -mountpoint /Volumes/install_app
 
# Convert the boot image to a sparse bundle
hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/Yosemite
 
# Increase the sparse bundle capacity to accommodate the packages
hdiutil resize -size 8g /tmp/Yosemite.sparseimage
 
# Mount the sparse bundle for package addition
hdiutil attach /tmp/Yosemite.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
 
# Remove Package link and replace with actual files
rm /Volumes/install_build/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/install_build/System/Installation/

# Copy missing BaseSystem files
cp /Volumes/install_app/BaseSystem.dmg /Volumes/install_build/
cp /Volumes/install_app/BaseSystem.chunklist /Volumes/install_build/

# Unmount the installer image
hdiutil detach /Volumes/install_app
 
# Unmount the sparse bundle
hdiutil detach /Volumes/install_build
 
# Resize the partition in the sparse bundle to remove any free space
hdiutil resize -size `hdiutil resize -limits /tmp/Yosemite.sparseimage | tail -n 1 | awk '{ print $1 }'`b /tmp/Yosemite.sparseimage
 
# Convert the sparse bundle to ISO/CD master
hdiutil convert /tmp/Yosemite.sparseimage -format UDTO -o /tmp/Yosemite
 
# Remove the sparse bundle
rm /tmp/Yosemite.sparseimage
 
# Rename the ISO and move it to the desktop
mv /tmp/Yosemite.cdr "$result_iso"