Node occasionally gives multiple files/folders the same inode #12115
Description
Moderator's note (@Fishrock123): Off-topic comments have and will be deleted.
- Version: v7.2.1
- Platform: Windows 10 Pro 64bit, Windows 7 Enterprise 64bit (Both using NTFS)
- Subsystem: File System
Node sometimes reports different files/folders to have identical ino values.
I can't reproduce this consistently and copying/reproducing a folder structure that contains dupes elsewhere doesn't replicate the issue.
I did encounter lots of duplicates under C:\Users\%USER%\AppData but it may be different for other people
Example
Specific example I encountered
# Structure │ ServerStore.jsx │ ├───constants │ Api.jsx │ └───stores UserStore.jsx > fs.lstatSync("stores").ino 5910974511014218 > fs.lstatSync("stores/UserStore.jsx").ino 24206847997202570 > fs.lstatSync("constants").ino //Duplicate 9851624184963316 > fs.lstatSync("constants/Api.jsx").ino //Duplicate 9851624184963316 > fs.lstatSync("ServerStore.jsx").ino 3659174697792238 Test Script
Here's a hacky node script to loop through a directory and look for duplicate inodes.
Running it on most of my other folders didn't yield a result, until I ran it on C:\Users\%USER%\AppData where I encounted loads of duplicates
Usage: node dupe.js [dir]
var fs = require('fs'); var path = require('path'); var process = require('process'); // Recursively walks a directory and looks for duplicate inodes // loop from http://stackoverflow.com/questions/5827612/node-js-fs-readdir-recursive-directory-search var dir = process.argv[2]; if (dir == undefined) { dir = '.'; } var walk = function(dir, done) { var results = []; fs.readdir(dir, function(err, list) { if (err) return done(err); var pending = list.length; if (!pending) return done(null, results); list.forEach(function(file) { file = path.resolve(dir, file); fs.stat(file, function(err, stat) { if(stat && stat.ino) { results.push({ file: file, ino: stat.ino }); } if (stat && stat.isDirectory()) { walk(file, function(err, res) { if(res) { results = results.concat(res); } if (!--pending) done(null, results); }); } else { if (!--pending) done(null, results); } }); }); }); }; walk(dir, function(err, results) { var merge = {}; results.forEach(function(it) { if (!merge[it.ino]) { merge[it.ino] = []; } merge[it.ino].push(it.file); }); var dupes = Object.keys(merge).filter(key => merge[key].length > 1); dupes.forEach(it => console.log(it, merge[it])); })