The "../.." folder is always ignored

[not-an-aardvark]

(Found while investigating this report from Gitter)

Tell us about your environment

• ESLint Version: v5.2.0
• Node Version: 8.11.3
• npm Version: 5.10.0

What parser (default, Babel-ESLint, etc.) are you using?

Please show your full configuration:

Configuration

(none)

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

mkdir -p foo/bar/baz
echo 'foo!' > foo/file.js
cd foo/bar/baz
eslint --no-eslintrc ../..

What did you expect to happen?

I expected ESLint to lint the foo/file.js file and report a parsing error for it, since its syntax is invalid.

What actually happened? Please include the actual, raw output from ESLint.

ESLint didn't find any files:

$ eslint --no-eslintrc ../..

Oops! Something went wrong! :(

ESLint: 5.2.0.
No files matching the pattern "../.." were found.
Please check for typing mistakes in the pattern.

This is happening as a result of the logic here. By default, ESLint ignores all folders starting with a . character (to prevent things like .git from being linted), and there is supposed to be an exception that prevents folders in .. from being ignored. However, it seems like this exception isn't working when a folder is ../.., so that folder is incorrectly being ignored.