Node fs.copyfileSync hangs when source and destination are identical

[fgauthie]

• Version: v10.15.3
• Platform: 4.15.0-46-generic debugger: use requireRepl() to load debugger repl #49~16.04.1-Ubuntu x86_64
• Subsystem: fs

Unless the fs.constants.COPYFILE_EXCL flag is passed, when source and destination are the same, Node hangs forever.

const fs = require('fs'); 

fs.writeFileSync('foo', 'Hello World!');
fs.copyFileSync('foo', 'foo');

//Never reach here
console.log('Done');

[santigimeno]

I think if the proposal in libuv/libuv#2237 is implemented, this should be fixed.

[fgauthie]

Thanks for quick response!

Indeed, it seems likely that this would fix the issue.