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@wuhao5
Created October 17, 2014 20:46
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1. Download Yosemite from the App Store (or your favorite digital content distribution warehouse)
2. Open terminal
3. Run "gem install iesd"
4. Run "iesd -i /Applications/Install\ OS\ X\ 10.10\ Developer\ Preview.app -o yosemite.dmg -t BaseSystem"
Adding additional steps because certain files end up missing from above:
5. Run "hdiutil convert yosemite.dmg -format UDSP -o yosemite.sparseimage"
6. Run "hdiutil mount /Applications/Install\ OS\ X\ 10.10\ Developer\ Preview.app/Contents/SharedSupport/InstallESD.dmg"
7. Run "hdiutil mount yosemite.sparseimage"
8. Run "cp /Volumes/OS\ X\ Install\ ESD/BaseSystem.* /Volumes/OS\ X\ Base\ System/"
9. Run "hdiutil unmount /Volumes/OS\ X\ Install\ ESD/"
10. Run "hdiutil unmount /Volumes/OS\ X\ Base\ System/"
11. Run "hdiutil convert yosemite.sparseimage -format UDZO -o yosemitefixed.dmg"
12. Add yosemitefixed.dmg as a live cd in virtual box
13. Change the chipset of your virtual machine to "PIIX3"
14. Start your VM, open Disk Utility within installer and create a new HFS+ partition on the virtual disk
15. Install it!
@livelively
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Have found a solution to do it from Mavericks (Maybe work for earlier os versions) from command line itself. Works perfectly for me & creates a 6 GB ISO for Yosemite. here are the instructions:

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 10g /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/

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

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