Create OS X Install ISO Scripts

create-elcap-install-iso.sh

#!/bin/bash  

OSX_NAME=ElCapitan
  
hdiutil attach "/Applications/Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg" -noverify -nobrowse -mountpoint /Volumes/esd
hdiutil create -o $OSX_NAME.cdr -size 7316m -layout SPUD -fs HFS+J
hdiutil attach $OSX_NAME.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/iso
asr restore -source /Volumes/esd/BaseSystem.dmg -target /Volumes/iso -noprompt -noverify -erase
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
cp -rp /Volumes/esd/Packages /Volumes/OS\ X\ Base\ System/System/Installation
cp -rp /Volumes/esd/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/
cp -rp /Volumes/esd/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/
hdiutil detach /Volumes/esd
hdiutil detach /Volumes/OS\ X\ Base\ System
hdiutil convert $OSX_NAME.cdr.dmg -format UDTO -o $OSX_NAME.iso
mv $OSX_NAME.iso.cdr ~/Desktop/$OSX_NAME.iso

create-yosemite-install-iso.sh

#!/bin/bash  

OSX_NAME=Yosemite

# 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/$OSX_NAME
   
# Increase the sparse bundle capacity to accommodate the packages  
hdiutil resize -size 8g /tmp/$OSX_NAME.sparseimage  
   
# Mount the sparse bundle for package addition  
hdiutil attach /tmp/$OSX_NAME.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/$OSX_NAME.sparseimage | tail -n 1 | awk '{ print $1 }'`b /tmp/$OSX_NAME.sparseimage  
   
# Convert the sparse bundle to ISO/CD master  
hdiutil convert /tmp/$OSX_NAME.sparseimage -format UDTO -o /tmp/$OSX_NAME  
   
# Remove the sparse bundle  
rm /tmp/$OSX_NAME.sparseimage  
   
# Rename the ISO and move it to the desktop  
mv /tmp/$OSX_NAME.cdr ~/Desktop/$OSX_NAME.iso