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Experiments with AutoDMG, System Image Utility and OS version compatibility

I use AutoDMG to build restorable system images for OS X, which uses a technique similar to System Image Utility’s NetRestore: run the OS X installer on one machine, but targeted at a disk image which is later converted to a read-only disk image, which can be restored to a Mac. While running the 10.10.3 […]

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Security Updates leaving mach_kernel visible

In the past, there have been cases where system updates for 10.8.5 (and possibly earlier versions) leave the OS X kernel (at /mach_kernel) visible to users in the Finder. This file has since moved to /System/Library/Kernels/kernel in OS X Yosemite, but previously to Yosemite it is located at /, and included in the package payload […]

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darwinup, Apple’s Darwin Update utility

Yesterday in ##osx-server, Pepijn Bruienne mentioned having stumbled upon an OS X system binary he’d never seen before, which was new to me as well: darwinup. This tool is used (or was used – public development of it seems to have stopped around OS X 10.7) for the purpose of managing versions of OS X […]

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