create_yosemite_iso.sh: Create a bootable .iso OS X Yosemite installer (for use with e.g. VirtualBox)

create_yosemite_iso.sh

#!/bin/bash  

# create_yosemite_iso.sh: Create a bootable .iso OS X Yosemite installer (for use with e.g. VirtualBox)
# See https://gist.github.com/cellularmitosis/6e902579296e82ec6273

# This is a (slightly) edited version of IOOI SqAR's script.
# See http://sqar.blogspot.de/2014/10/installing-yosemite-in-virtualbox.html

# Changes from IOOI SqAR's script include:
# * Use 'hdiutil makehybrid' to convert the .cdr image to a "real" .iso image.
# * Don't continue executing if you hit an error (set -e)
# * Verbose mode (set -x)
# * Place the .iso in the current directory (rather than ~/Desktop)

set -e
set -x

# Mount the installer image  
hdiutil attach /Applications/Install\ OS\ X\ Yosemite.app/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 Base System  
cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/install_build/  
cp -rp /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  

# Convert the .cdr to .iso
# Note: if I don't run this as sudo, I get the following error:
#   hdiutil: makehybrid failed - Operation not permitted
sudo hdiutil makehybrid -iso -joliet -o Yosemite.iso /tmp/Yosemite.cdr
sudo chown ${USER} Yosemite.iso

# Remove the .cdr file
rm /tmp/Yosemite.cdr