Santa Overslept Mac OS

In the past, I'd used the fake installer approach to stop users from upgrading to the newest macOS version.

1. Santa Overslept Mac Os X
2. Santa Overslept Mac Os Download
3. Santa Overslept Mac Os 11
4. Mac Os Versions
5. Santa Overslept Mac Os Catalina

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But with macOS 10.14 (Mojave), I started blocking using Santa (see Using Santa to block an .app for more details on general Santa use). It's likely this Santa-blocking approach also works for High Sierra and Sierra as well—I just haven't tested it on those.

Santa Overslept Mac Os X

Just download Mojave to your Mac, and then run

Then run a modified version of this command (substituting in the actual SHA-256 hash for the placeholder) to add it to the Santa blacklist:

We were able to test this on two Mojave installers downloaded using two separate Apple IDs, so the binary seems to be the same regardless of which Apple ID is used to download it.

If a user then tries to run the Mojave installer, she or he will see a message like this:

Again, since it's based on the binary (and since you don't want to block by Apple certificate—which you may not be able to do anyway with Santa?—so you have to block by binary), you would have to create a new rule for every new macOS installer that comes out (10.14, 10.14.1, 10.14.2, 10.14.3.. 10.15, 10.15.1.. 10.16.. and so on).

Special Note

Thanks to @elios (on Mac Admins Slack) for pointing out that this probably would not block the startosinstall binary from running. I was able to test and verify blocking the .app binary does not, in fact, block the startosinstall binary from running.

Also, by default, Santa will get the binary for InstallAssistant_springboard. If you want to be super aggressive, you might also want to block the InstallAssistant and InstallAssistant_plain binaries. Otherwise, the user can still run those two to get the GUI assistant to launch up.

Lego game with 1 lvl and its kinda trash (first project) mac os. So you really have to ask yourself how aggressively you want to block Mojave. Are you preventing users from just accidentally upgrading? Or do you want to prevent from upgrading even the most determined users who have admin privileges?

If you want to block startosinstall as well, you can do that. Just find (and subsequently block) the SHA-256 hash it:

Santa Overslept Mac Os Download

Santa Overslept Mac Os 11

Mac Os Versions

Santa Overslept Mac Os X

Just download Mojave to your Mac, and then run

Then run a modified version of this command (substituting in the actual SHA-256 hash for the placeholder) to add it to the Santa blacklist:

We were able to test this on two Mojave installers downloaded using two separate Apple IDs, so the binary seems to be the same regardless of which Apple ID is used to download it.

If a user then tries to run the Mojave installer, she or he will see a message like this:

Again, since it's based on the binary (and since you don't want to block by Apple certificate—which you may not be able to do anyway with Santa?—so you have to block by binary), you would have to create a new rule for every new macOS installer that comes out (10.14, 10.14.1, 10.14.2, 10.14.3.. 10.15, 10.15.1.. 10.16.. and so on).

Special Note

Thanks to @elios (on Mac Admins Slack) for pointing out that this probably would not block the startosinstall binary from running. I was able to test and verify blocking the .app binary does not, in fact, block the startosinstall binary from running.

Also, by default, Santa will get the binary for InstallAssistant_springboard. If you want to be super aggressive, you might also want to block the InstallAssistant and InstallAssistant_plain binaries. Otherwise, the user can still run those two to get the GUI assistant to launch up.

Lego game with 1 lvl and its kinda trash (first project) mac os. So you really have to ask yourself how aggressively you want to block Mojave. Are you preventing users from just accidentally upgrading? Or do you want to prevent from upgrading even the most determined users who have admin privileges?

If you want to block startosinstall as well, you can do that. Just find (and subsequently block) the SHA-256 hash it:

Santa Overslept Mac Os Download

Santa Overslept Mac Os 11

Mac Os Versions

Santa Overslept Mac Os Catalina

If you block startosinstall, then try to install the upgrade with Munki, you'll see it mount the .dmg, then stop. The log entries will look something like this: