startosinstall updated in macOS 10.12.4 app installer and can no longer target a volume

I recently blogged about my upgrade process with Jamf Pro. The script I had worked well with 10.12.3. One would assume it would work well with the 10.12.4 macOS app installer as well. However it appears that Apple has removed a flag. Specifically, you can no longer specify what volume you want to target for the installation.

The command that you could use previously in 10.12.3 looked like:

"/Applications/Install macOS Sierra.app/Contents/Resources/startosinstall" --applicationpath "/Applications/Install macOS Sierra.app" --volume / --rebootdelay 30 --nointeraction

In 10.12.4, it now looks like:

"/Applications/Install macOS Sierra.app/Contents/Resources/startosinstall" --applicationpath "/Applications/Install macOS Sierra.app" --rebootdelay 30 --nointeraction

Those are just examples of some of the flags you could use. Basically they’ve removed --volume /. All this to say I had to update my script to account for this. This led to a bunch of other code I saw that I could optimize. I have added some additional exit codes and added additional functions to reduce code re-use. The updated script can be downloaded from my GitHub repo. For instructions on how to use it, please refer to my previous blog post.

Another method for macOS upgrades via the JSS using Self Service

There are quite a few methods that people use to make macOS updates available to their end users. My method takes a little inspiration from those posts with a few differences. This time around I wanted to use the macOS installer app from Apple which has a neat little command line tool call startosinstall. There was no particular reason to use this method other than there were no requirements to install any particular packages post-install which you can do with a tool like createOSinstallerPKG. We had a few requirements:

  1. Computer has sufficient free drive space.
  2. User is not logged in to avoid the new iCloud Drive Document Sync feature.
  3. Ensure the user is plugged into a power source.
  4. Provide dialogs to give the user feedback such as a time estimate and dialogs on what to expect next.
  5. Make use of the JSS parameter to allow for customization and potential re-use for future operating systems.

Continue reading Another method for macOS upgrades via the JSS using Self Service