prettier does not prune directories from the tree when they are ignored by .prettierignore. This seems to mean that there is no way to avoid errors from directories which are not readable by the user running prettier.

Environments

• Prettier Version: 2.4.1
• Running Prettier via: CLI
• Runtime: Node.js v14
• Operating System: openSUSE Linux
• Prettier plugins (if any): none

Steps to reproduce

mkdir -p prettier-test/ignore-me/root-only-dir
cd prettier-test/
echo ignore-me > .prettierignore
echo '{}' > foo.json
echo '{}' > ignore-me/root-only-dir/foo.json
sudo chown root:root ignore-me/root-only-dir/
sudo chmod 700 ignore-me/root-only-dir/

Expected behavior

prettier -c . runs with no errors.

Actual behavior

prettier -c . issues an EACCES error due to trying to read root-only-dir and failing:

$ prettier -c . --loglevel debug
[debug] normalized argv: {"_":["."],"color":true,"editorconfig":true,"loglevel":"debug","config-precedence":"cli-override","debug-repeat":0,"ignore-path":".prettierignore","plugin":[],"plugin-search-dir":[],"check":true}
Checking formatting...
[error] Unable to expand directory: .
[error] EACCES: permission denied, scandir '/home/adam/prettier-test/ignore-me/root-owned-dir'
All matched files use Prettier code style!

Example use case

If docker containers are run from a subtree, this may cause files and directories owned by root. It should be possible to tell prettier to prune that entire subtree from its search.