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I noticed that on panfs, Python's copystat fails when the source file does not have the u+w permission bit set; setting attributes fails with Permission denied command line equivalent: (attr_set: Permission denied).

Considering that for "normal" files on "normal" filesystems, file ownership is enough to change attributes, I wonder if panfs is being unreasonable, or if this is something the calling application (in this case Python's copystat or a higher level function) should be expected to catch.

What are the normal requirements for the ability to set extended file attributes? Is panfs unreasonable? Or should I file with the Python folk that they should catch this?

It's causing pip install to fail, so it's a rather annoying problem in practice.

See also this Python bug report.

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