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feat(pivot_root): add pivot_root utility#443
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Implement the pivot_root(2) syscall wrapper for changing the rootfilesystem. This utility is commonly used during container initializationand system boot.Features:- Linux/Android support via direct syscall- Graceful error on unsupported platforms- Detailed error messages with errno-specific hints- Non-UTF-8 path support via OsStringThe implementation delegates all path validation to the kernel,only checking for embedded null bytes which are invalid for C strings.
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Implemented
pivot_root, which is a simple wrapper for thepivot_root(2)syscall to enable changing the root filesystem.Only Linux systems (including Android) have the needed syscall. I also tried to include descriptive error handling.