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This mirrors what was done for pathlib.Path to avoid confusion about
argument order.
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As we learn from util-linux, MS_RDONLY is ignored on MS_BIND. Rather
than remount, just use the new mount API as it doesn't suffer this
limitation.
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In particular, one can now pass newdev = origdev.
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Fixes: 1de72653e0b9 ("add function linuxnamespaces.populate_sys")
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pathlib.Path(somebytes) fails. Hence bytes is not actually convertible
and should not be included in PathConvertible. Then, we can simplify
matters in quite a few places by knowing that the thing we work with is
not bytes.
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When using sys.exit, we actually raise a SystemExit exception and as a
consequence exit all context managers. If a particular context manager
pertains only the process at hand, we don't really care, because our
process is supposed to vanish. If a context manager changes external
state such as tempfile.NamedTemporaryFile, this is very bad and
unexpected. We need to ensure that such cleanup is not performed.
This also simplifies the test suite that had to emulate this behaviour
already as pytest uses a context manager.
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Most frequently, the root user is allocated.
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