bugfix #4884 On FreeBSD read(2) can read directories. Detect them before read. #8128
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Summary
This is a fix for issue #4884 which shows up on FreeBSD and other OSes where it is possible to read(2) a directory (depending on the filesystem actually) and get back some binary representation of it.
This causes yarn to file as described in issue #4884.
In the FreeBSD ports tree we are installing yarn with another patch fundamentally backing out commit 2cb2fc4. This is suboptimal, also because we are patching the compiled bundle at present. Having a proper fix included upstream would be great.
I'll update the CHANGELOG in a new commit on this same pull request shortly.
Test plan
I tested it locally by checking that the same operations failing with a clean install are not happening with the new bundle.