copyFileSync on Windows error: uncaughtException: EPERM: operation not permitted, copyfile

[rlyders]

graceful-fs@4.1.15

---

Error occurs on Windows 10 whether I am in DOS (Admin mode or not), Powershell (Admin mode or not), or GitBash.

---

Environment:
npm 6.4.1
node v10.14.2
tsc 3.2.2

Tutorial I am working through: https://gonehybrid.com/ionic-4-appsync-set-up-authentication-with-amazon-cognito-part-5/

---

I was able to work around this issue by always deleting the dest file when any error occurs and then trying again.

NOTE: You will notice that I also added 10 re-attempts to allow for the chance that files were being locked by virus protection, but that did not seem to be the case in my situation.

FILE: %userprofile%\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js

`
function wait(ms) {
var start = Date.now(),
now = start;
while (now - start < ms) {
now = Date.now();
}
}

function copyFile(srcStat, src, dest, opts) {
if (typeof fs.copyFileSync === 'function') {
console.log('----------------------------------');
console.log('----------------------------------');
console.log('fs.copyFileSync( src=' + src + ',');
console.log(' dest=' + dest + ')');

let fileCopyDone = false;
let attempts = 0;
do {
  try {
    attempts++;
    console.log('Attempt #' + attempts + '...');
    fs.copyFileSync(src, dest)
    fileCopyDone = true;
  } catch (err) {
    console.log('ERROR: fs.copyFileSync: ' + err.message);
    if (attempts > 10)
      throw err;
    wait(300);
    if (basicFs.existsSync(dest)) {
      console.log('Delete dest file: ' + dest);
      try {
        basicFs.unlinkSync(dest);
        console.log('successfully deleted: ' + dest);
      } catch (err) {
        console.log('ERROR: basicFs.unlinkSync: ' + err.message);
      }
    }
  }
} while (!fileCopyDone);

console.log('----------------------------------');
console.log('fs.chmodSync(dest=' + dest + ',');
console.log('    srcStat.mode=' + srcStat.mode + ')');
fs.chmodSync(dest, srcStat.mode)
console.log('----------------------------------');
console.log('----------------------------------');
if (opts.preserveTimestamps) {
  return utimesSync(dest, srcStat.atime, srcStat.mtime)
}
return

}
return copyFileFallback(srcStat, src, dest, opts)
}

`

Detailed error message:

2018-12-16T18:08:39.503Z - error: uncaughtException: EPERM: operation not permitted, copyfile 'C:\Users\Richa\projects\quiz-app\amplify\backend\api\quizapp\build\schema.graphql' -> 'C:\Users\Richa\projects\quiz-app\amplify#current-cloud-backend\api\quizapp\build\schema.graphql' date=Sun Dec 16 2018 12:08:39 GMT-0600 (Central Standard Time), pid=23448, uid=null, gid=null, cwd=C:\Users\Richa\projects\quiz-app, execPath=C:\Program Files\nodejs\node.exe, version=v10.14.2, argv=[C:\Program Files\nodejs\node.exe, C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\bin\amplify, push], rss=123424768, heapTotal=99049472, heapUsed=76451904, external=2053595, loadavg=[0, 0, 0], uptime=89738, trace=[column=3, file=fs.js, function=Object.copyFileSync, line=1724, method=copyFileSync, native=false, column=12, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=copyFile, line=85, method=null, native=false, column=12, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=mayCopyFile, line=60, method=null, native=false, column=47, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=onFile, line=53, method=null, native=false, column=32, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=getStats, line=47, method=null, native=false, column=10, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=startCopy, line=37, method=null, native=false, column=10, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=copyDirItem, line=166, method=null, native=false, column=39, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=fs.readdirSync.forEach.item, line=159, method=item, native=false, column=null, file=null, function=Array.forEach, line=null, method=forEach, native=false, column=23, file=C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js, function=copyDir, line=159, method=null, native=false], stack=[Error: EPERM: operation not permitted, copyfile 'C:\Users\Richa\projects\quiz-app\amplify\backend\api\quizapp\build\schema.graphql' -> 'C:\Users\Richa\projects\quiz-app\amplify#current-cloud-backend\api\quizapp\build\schema.graphql', at Object.copyFileSync (fs.js:1724:3), at copyFile (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:85:12), at mayCopyFile (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:60:12), at onFile (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:53:47), at getStats (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:47:32),
at startCopy (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:37:10), at copyDirItem (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:166:10), at fs.readdirSync.forEach.item (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:159:39), at Array.forEach (), at copyDir (C:\Users\Richa\AppData\Roaming\npm\node_modules@aws-amplify\cli\node_modules\fs-extra\lib\copy-sync\copy-sync.js:159:23)]