prepare_yosemite-dmi.sh

 #!/bin/bash  
   
 # 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  
   
 # Rename the ISO and move it to the desktop  
 mv /tmp/Yosemite.cdr ~/Desktop/Yosemite.iso