fs.readdirSync(recursive=true) should not follow follow symlinks by default

[myocytebd]

Version

v21.6.2

Platform

Linux 6.5.0-15-generic #15~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC x86_64 x86_64 x86_64 GNU/Linux

Subsystem

fs

What steps will reproduce the bug?

• Ensure a directory tree with symlink, e.g.

./
../
mylink -> ../other_dir/

• fs.readdirSync('.', { recursive: true })

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior? Why is that the expected behavior?

[ './mylink' ]

What do you see instead?

All files under ../other_dir/ are listed.

Additional information

This behavior is extremely surprising and error-prone, since common commands like find or Get-ChildItem does not follow symlink by default.
In addition, it is not documented.

[aduh95]

Would you like to send a PR adding an option to turn off/on that behavior?

[kylo5aby]

for the case below

dir
- dir1 -->dir-symlink
- file

fs.readdirSync('./dir', {{ recursive: true, withFileTypes: true }}) and fs.readdirSync('./dir', {{ recursive: true, withFileTypes: false}} have different output.:

fs.readdirSync('dir', {recursive: true, withFileTypes: true});
//Output:
// [
//     Dirent { name: 'dir1', path: 'dir', [Symbol(type)]: 2 },
//     Dirent { name: 'dir1-symlink', path: 'dir', [Symbol(type)]: 3 },
//     Dirent { name: '1.txt', path: 'dir/dir1', [Symbol(type)]: 1 }
// ]
fs.readdirSync('dir', {recursive: true, withFileTypes: false});
//Output:
//[ 'dir1', 'dir1-symlink', 'dir1/1.txt', 'dir1-symlink/1.txt' ]

I found that it due to

node/lib/fs.js

Line 1416 in 9ef03f1

if (dirent.isDirectory()) {

node/lib/fs.js

Line 1424 in 9ef03f1

const stat = binding.internalModuleStat(resultPath);

have different behavior.