Ned Deily <n...@python.org> added the comment:
> Is there anything more to do here?
A belated response: probably not, so I'm OK with closing this.
A quick check shows that macOS behavior has changed a bit on more recent
releases. On current macOS Big Sur (11.6.3) and Monterey (12.2) releases, Bo's
test:
$ python3 -c 'import os; open(os.path.relpath("/tmp/test.txt"), "w")'
now works and Ronald's touch example now fails with a somewhat more meaningful
message:
$ touch ../../foo.txt
touch: ../../foo.txt: Read-only file system
In general, though, even on pre-APFS older macOS systems, it is still best to
avoid or at least be very careful about using /tmp with any sort of relative
path testing because of the linking of /tmp to /private/tmp. :(
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<https://bugs.python.org/issue38295>
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