Use relative linking (#6011)

* Use relative linking

* Add copyFile method and tests

Closes #5988

* Fix relative linking on Windows

Hard links and junctions don't work with relative paths

* Fix tests

* Revert ghange to gitignore

src/file.js

@@ -12,35 +12,76 @@ var utils = require('./utils');
 
 var file = module.exports;
 
+/**
+ * Asynchronously copies `src` to `dest`
+ * @param {string} src - source filename to copy
+ * @param {string} dest - destination filename of the copy operation
+ * @param {function(Error): void} callback
+ */
+function copyFile(src, dest, callback) {
+	var calledBack = false;
+
+	var read;
+	var write;
+
+	function done(err) {
+		if (calledBack) {
+			return;
+		}
+		calledBack = true;
+
+		if (err) {
+			if (read) {
+				read.destroy();
+			}
+			if (write) {
+				write.destroy();
+			}
+		}
+
+		callback(err);
+	}
+
+	read = fs.createReadStream(src);
+	read.on('error', done);
+
+	write = fs.createWriteStream(dest);
+	write.on('error', done);
+	write.on('close', function () {
+		done();
+	});
+
+	read.pipe(write);
+}
+
+file.copyFile = (typeof fs.copyFile === 'function') ? fs.copyFile : copyFile;
+
 file.saveFileToLocal = function (filename, folder, tempPath, callback) {
 	/*
 	 * remarkable doesn't allow spaces in hyperlinks, once that's fixed, remove this.
 	 */
-	filename = filename.split('.');
-	filename.forEach(function (name, idx) {
-		filename[idx] = utils.slugify(name);
-	});
-	filename = filename.join('.');
+	filename = filename.split('.').map(function (name) {
+		return utils.slugify(name);
+	}).join('.');
 
 	var uploadPath = path.join(nconf.get('upload_path'), folder, filename);
 
 	winston.verbose('Saving file ' + filename + ' to : ' + uploadPath);
 	mkdirp(path.dirname(uploadPath), function (err) {
 		if (err) {
-			callback(err);
+			return callback(err);
 		}
 
-		var is = fs.createReadStream(tempPath);
-		var os = fs.createWriteStream(uploadPath);
-		is.on('end', function () {
+		file.copyFile(tempPath, uploadPath, function (err) {
+			if (err) {
+				return callback(err);
+			}
+
 			callback(null, {
 				url: '/assets/uploads/' + folder + '/' + filename,
 				path: uploadPath,
 			});
 		});
-
-		os.on('error', callback);
-		is.pipe(os);
 	});
 };
 
@@ -125,15 +166,33 @@ file.delete = function (path) {
 	}
 };
 
-file.link = function link(filePath, destPath, cb) {
+file.link = function link(filePath, destPath, relative, callback) {
+	if (!callback) {
+		callback = relative;
+		relative = false;
+	}
+
+	if (relative && process.platform !== 'win32') {
+		filePath = path.relative(path.dirname(destPath), filePath);
+	}
+
 	if (process.platform === 'win32') {
-		fs.link(filePath, destPath, cb);
+		fs.link(filePath, destPath, callback);
 	} else {
-		fs.symlink(filePath, destPath, 'file', cb);
+		fs.symlink(filePath, destPath, 'file', callback);
 	}
 };
 
-file.linkDirs = function linkDirs(sourceDir, destDir, callback) {
+file.linkDirs = function linkDirs(sourceDir, destDir, relative, callback) {
+	if (!callback) {
+		callback = relative;
+		relative = false;
+	}
+
+	if (relative && process.platform !== 'win32') {
+		sourceDir = path.relative(path.dirname(destDir), sourceDir);
+	}
+
 	var type = (process.platform === 'win32') ? 'junction' : 'dir';
 	fs.symlink(sourceDir, destDir, type, callback);
 };

src/meta/js.js

@@ -88,6 +88,14 @@ JS.scripts = {
 	},
 };
 
+function linkIfLinux(srcPath, destPath, next) {
+	if (process.platform === 'win32') {
+		file.copyFile(srcPath, destPath, next);
+	} else {
+		file.link(srcPath, destPath, true, next);
+	}
+}
+
 var basePath = path.resolve(__dirname, '../..');
 
 function minifyModules(modules, fork, callback) {
@@ -120,7 +128,7 @@ function minifyModules(modules, fork, callback) {
 			},
 			function (cb) {
 				async.eachLimit(filtered.skip, 500, function (mod, next) {
-					file.link(mod.srcPath, mod.destPath, next);
+					linkIfLinux(mod.srcPath, mod.destPath, next);
 				}, cb);
 			},
 		], callback);
@@ -148,20 +156,10 @@ function linkModules(callback) {
 				return next(err);
 			}
 			if (res.stats.isDirectory()) {
-				return file.linkDirs(srcPath, destPath, next);
+				return file.linkDirs(srcPath, destPath, true, next);
 			}
 
-			if (process.platform === 'win32') {
-				fs.readFile(srcPath, function (err, file) {
-					if (err) {
-						return next(err);
-					}
-
-					fs.writeFile(destPath, file, next);
-				});
-			} else {
-				file.link(srcPath, destPath, next);
-			}
+			linkIfLinux(srcPath, destPath, next);
 		});
 	}, callback);
 }
@@ -267,7 +265,7 @@ JS.linkStatics = function (callback) {
 					return next(err);
 				}
 
-				file.linkDirs(sourceDir, destDir, next);
+				file.linkDirs(sourceDir, destDir, true, next);
 			});
 		}, callback);
 	});

test/file.js

@@ -0,0 +1,100 @@
+'use strict';
+
+var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
+var nconf = require('nconf');
+
+var utils = require('../src/utils');
+var file = require('../src/file');
+
+describe('file', function () {
+	var filename = utils.generateUUID() + '.png';
+	var folder = 'files';
+	var uploadPath = path.join(nconf.get('upload_path'), folder, filename);
+	var tempPath = path.join(__dirname, './files/test.png');
+
+	afterEach(function (done) {
+		fs.unlink(uploadPath, function () {
+			done();
+		});
+	});
+
+	describe('copyFile', function () {
+		it('should copy a file', function (done) {
+			file.copyFile(tempPath, uploadPath, function (err) {
+				assert.ifError(err);
+
+				assert(file.existsSync(uploadPath));
+
+				var srcContent = fs.readFileSync(tempPath, 'utf8');
+				var destContent = fs.readFileSync(uploadPath, 'utf8');
+
+				assert.strictEqual(srcContent, destContent);
+				done();
+			});
+		});
+
+		it('should override an existing file', function (done) {
+			fs.writeFileSync(uploadPath, 'hsdkjhgkjsfhkgj');
+
+			file.copyFile(tempPath, uploadPath, function (err) {
+				assert.ifError(err);
+
+				assert(file.existsSync(uploadPath));
+
+				var srcContent = fs.readFileSync(tempPath, 'utf8');
+				var destContent = fs.readFileSync(uploadPath, 'utf8');
+
+				assert.strictEqual(srcContent, destContent);
+				done();
+			});
+		});
+
+		it('should error if source file does not exist', function (done) {
+			file.copyFile(tempPath + '0000000000', uploadPath, function (err) {
+				assert(err);
+				assert.strictEqual(err.code, 'ENOENT');
+
+				done();
+			});
+		});
+
+		it('should error if existing file is read only', function (done) {
+			fs.writeFileSync(uploadPath, 'hsdkjhgkjsfhkgj');
+			fs.chmodSync(uploadPath, '444');
+
+			file.copyFile(tempPath, uploadPath, function (err) {
+				assert(err);
+				assert(err.code === 'EPERM' || err.code === 'EACCES');
+
+				done();
+			});
+		});
+	});
+
+	describe('saveFileToLocal', function () {
+		it('should work', function (done) {
+			file.saveFileToLocal(filename, folder, tempPath, function (err) {
+				assert.ifError(err);
+
+				assert(file.existsSync(uploadPath));
+
+				var oldFile = fs.readFileSync(tempPath, 'utf8');
+				var newFile = fs.readFileSync(uploadPath, 'utf8');
+				assert.strictEqual(oldFile, newFile);
+
+				done();
+			});
+		});
+
+		it('should error if source does not exist', function (done) {
+			file.saveFileToLocal(filename, folder, tempPath + '000000000', function (err) {
+				assert(err);
+				assert.strictEqual(err.code, 'ENOENT');
+
+				done();
+			});
+		});
+	});
+});