Ah, I looked at the code. It's to determine if we're in the root directory (and need to step going up). I think `moz.build` would be a bad file to check for in that case, since there are plenty of duplicates of those in the tree. How about the `mach` file? That should be unique, and always in the root directory, since if it's not there you can't use any commands.
Bug 1798746 Comment 30 Edit History
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Ah, I looked at the code. It's to determine if we're in the root directory (and need to stop going up). I think `moz.build` would be a bad file to check for in that case, since there are plenty of duplicates of those in the tree. How about the `mach` file? That should be unique, and always in the root directory, since if it's not there you can't use any commands.