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Add support for legacy ISOs and USBs on Apple Silicon#229

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sulliops wants to merge 7 commits into
ninxsoft:mainfrom
sulliops:legacy-isos
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Add support for legacy ISOs and USBs on Apple Silicon#229
sulliops wants to merge 7 commits into
ninxsoft:mainfrom
sulliops:legacy-isos

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@sulliops

@sulliops sulliops commented Jul 3, 2026

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This PR resolves #85 by porting the logic for generating ISOs and bootable USBs for legacy (Intel-only) installers (OS X Mavericks through macOS Catalina) on Apple Silicon Macs from ninxsoft/mist-cli#166, using #106 as a reference.

To enable the bootable USB functionality as intended, this PR addresses the bug from ninxsoft/mist-cli#194. This PR does not address the bug reported in #198 and related issues that prevents installers for macOS High Sierra through macOS Catalina from being built on macOS 15.6+. I'm hoping to resolve that one down the line.

@ninxsoft I recommend updating the README to indicate which versions can be built by Apple Silicon Macs. I did not do so, as I wasn't sure what language you would prefer. You may also want to add a disclaimer that building a legacy bootable USB on Apple Silicon Macs is slow due to all the file copying, and requires additional spare disk space.

And yes, I am aware that Mavericks is theoretical. I'm just a fan who holds out hope we'll find a way to generate a new installer application for it.

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Suggestion: Use Rosetta to create older ISOs on Apple Silicon

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