Replace %v with %w to wrap underlying errors

[corpix]

Main motivation was fix to ListChain error to be able to handle errors.Is(err, unix.ENOENT), but then I found more errors which doesn't pass underlying error information and decided to fix them all.

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[stapelberg]

Thanks for your PR!

Main motivation was fix to ListChain error to be able to handle errors.Is(err, unix.ENOENT), but then I found more errors which doesn't pass underlying error information and decided to fix them all.

Changing all functions to pass through underlying errors is not “fixing them all”: Whether or not it makes sense to pass through an underlying error needs to be carefully examined on a case-by-case basis. See https://groups.google.com/g/golang-nuts/c/-bYObQTWX_8/m/9iwZrQnIBAAJ and https://matttproud.com/blog/posts/go-errors-and-api-contracts.html for rationale/discussion.

If you want to move forward with your PR, please reduce scope to only the errors you specifically care about and have tested, and then I can take another look. Thanks.