node.js implementation to move files avoiding EXDEV errors when moving files across different devices

gistfile1.js

'use strict';

var fs = require('fs'),
  q = require('q');

/**
 * Move a file from src to dest, avoiding cross-device rename failures.
 * This method will first try fs.rename and call the supplied callback if it succeeds. Otherwise
 * it will pump the conent of src into dest and unlink src upon completion.
 *
 * This might take a little more time than a single fs.rename, but it avoids error when
 * trying to rename files from one device to the other.
 *
 * @param src {String} absolute path to source file
 * @param dest {String} absolute path to destination file
 * @param cb {Function} callback to execute upon success or failure
 */
exports.move = function (src, dest, cb) {
	var renameDeferred = q.defer();

	fs.rename(src, dest, function (err) {
		if (err) {
			renameDeferred.reject(err);
		}
		else {
			renameDeferred.resolve();
		}
	});

	renameDeferred.promise.then(function () {
		// rename worked
		return cb(null);
	}, function (err) {

		console.warn('io.move: standard rename failed, trying stream pipe... (' + err + ')');

		// rename didn't work, try pumping
		var is = fs.createReadStream(src),
			os = fs.createWriteStream(dest);

		is.pipe(os);

		is.on('end', function () {
			fs.unlinkSync(src);
			cb(null);
		});

		is.on('error', function (err) {
			return cb(err);
		});

		os.on('error', function (err) {
			return cb(err);
		})
	});
};

Depends on q (npm install q)

thank you! It works on me