introduce and use extfs.realpath

src/vs/base/node/extfs.ts

@@ -374,13 +374,13 @@ export function writeFileAndFlush(path: string, data: string | NodeBuffer, optio
 /**
  * Copied from: https://github.com/Microsoft/vscode-node-debug/blob/master/src/node/pathUtilities.ts#L83
  *
- * Given an absolute, normalized, and existing file path 'realpath' returns the exact path that the file has on disk.
+ * Given an absolute, normalized, and existing file path 'realcase' returns the exact path that the file has on disk.
  * On a case insensitive file system, the returned path might differ from the original path by character casing.
  * On a case sensitive file system, the returned path will always be identical to the original path.
  * In case of errors, null is returned. But you cannot use this function to verify that a path exists.
- * realpathSync does not handle '..' or '.' path segments and it does not take the locale into account.
+ * realcaseSync does not handle '..' or '.' path segments and it does not take the locale into account.
  */
-export function realpathSync(path: string): string {
+export function realcaseSync(path: string): string {
 	const dir = paths.dirname(path);
 	if (path === dir) {	// end recursion
 		return path;
@@ -392,7 +392,7 @@ export function realpathSync(path: string): string {
 		const found = entries.filter(e => e.toLowerCase() === name);	// use a case insensitive search
 		if (found.length === 1) {
 			// on a case sensitive filesystem we cannot determine here, whether the file exists or not, hence we need the 'file exists' precondition
-			const prefix = realpathSync(dir);   // recurse
+			const prefix = realcaseSync(dir);   // recurse
 			if (prefix) {
 				return paths.join(prefix, found[0]);
 			}
@@ -400,7 +400,7 @@ export function realpathSync(path: string): string {
 			// must be a case sensitive $filesystem
 			const ix = found.indexOf(name);
 			if (ix >= 0) {	// case sensitive
-				const prefix = realpathSync(dir);   // recurse
+				const prefix = realcaseSync(dir);   // recurse
 				if (prefix) {
 					return paths.join(prefix, found[ix]);
 				}
@@ -411,4 +411,44 @@ export function realpathSync(path: string): string {
 	}
 
 	return null;
+}
+
+export function realpathSync(path: string): string {
+	try {
+		return fs.realpathSync(path);
+	} catch (error) {
+
+		// We hit an error calling fs.realpathSync(). Since fs.realpathSync() is doing some path normalization
+		// we now do a similar normalization and then try again if we can access the path with read
+		// permissions at least. If that succeeds, we return that path.
+		// fs.realpath() is resolving symlinks and that can fail in certain cases. The workaround is
+		// to not resolve links but to simply see if the path is read accessible or not.
+		const normalizedPath = normalizePath(path);
+		fs.accessSync(normalizedPath, fs.constants.R_OK); // throws in case of an error
+
+		return normalizedPath;
+	}
+}
+
+export function realpath(path: string, callback: (error: Error, realpath: string) => void): void {
+	return fs.realpath(path, (error, realpath) => {
+		if (!error) {
+			return callback(null, realpath);
+		}
+
+		// We hit an error calling fs.realpath(). Since fs.realpath() is doing some path normalization
+		// we now do a similar normalization and then try again if we can access the path with read
+		// permissions at least. If that succeeds, we return that path.
+		// fs.realpath() is resolving symlinks and that can fail in certain cases. The workaround is
+		// to not resolve links but to simply see if the path is read accessible or not.
+		const normalizedPath = normalizePath(path);
+
+		return fs.access(normalizedPath, fs.constants.R_OK, error => {
+			return callback(error, normalizedPath);
+		});
+	});
+}
+
+function normalizePath(path: string): string {
+	return strings.rtrim(paths.normalize(path), paths.sep);
 }
\ No newline at end of file

src/vs/base/node/pfs.ts

@@ -72,7 +72,7 @@ export function rimraf(path: string): TPromise<void> {
 }
 
 export function realpath(path: string): TPromise<string> {
-	return nfcall(fs.realpath, path, null);
+	return nfcall(extfs.realpath, path);
 }
 
 export function stat(path: string): TPromise<fs.Stats> {

src/vs/base/test/node/extfs/extfs.test.ts

@@ -203,7 +203,7 @@ suite('Extfs', () => {
 		});
 	});
 
-	test('realpath', (done) => {
+	test('realcase', (done) => {
 		const id = uuid.generateUuid();
 		const parentDir = path.join(os.tmpdir(), 'vsctests', id);
 		const newDir = path.join(parentDir, 'extfs', id);
@@ -213,7 +213,7 @@ suite('Extfs', () => {
 			// assume case insensitive file system
 			if (process.platform === 'win32' || process.platform === 'darwin') {
 				const upper = newDir.toUpperCase();
-				const real = extfs.realpathSync(upper);
+				const real = extfs.realcaseSync(upper);
 
 				if (real) { // can be null in case of permission errors
 					assert.notEqual(real, upper);
@@ -224,11 +224,45 @@ suite('Extfs', () => {
 
 			// linux, unix, etc. -> assume case sensitive file system
 			else {
-				const real = extfs.realpathSync(newDir);
+				const real = extfs.realcaseSync(newDir);
 				assert.equal(real, newDir);
 			}
 
 			extfs.del(parentDir, os.tmpdir(), () => { }, done);
 		});
 	});
+
+	test('realpath', (done) => {
+		const id = uuid.generateUuid();
+		const parentDir = path.join(os.tmpdir(), 'vsctests', id);
+		const newDir = path.join(parentDir, 'extfs', id);
+
+		extfs.mkdirp(newDir, 493, (error) => {
+
+			extfs.realpath(newDir, (error, realpath) => {
+				assert.ok(realpath);
+				assert.ok(!error);
+
+				extfs.del(parentDir, os.tmpdir(), () => { }, done);
+			});
+		});
+	});
+
+	test('realpathSync', (done) => {
+		const id = uuid.generateUuid();
+		const parentDir = path.join(os.tmpdir(), 'vsctests', id);
+		const newDir = path.join(parentDir, 'extfs', id);
+
+		extfs.mkdirp(newDir, 493, (error) => {
+			let realpath: string;
+			try {
+				realpath = extfs.realpathSync(newDir);
+			} catch (error) {
+				assert.ok(!error);
+			}
+			assert.ok(realpath);
+
+			extfs.del(parentDir, os.tmpdir(), () => { }, done);
+		});
+	});
 });
\ No newline at end of file

src/vs/code/node/paths.ts

@@ -5,7 +5,6 @@
 
 'use strict';
 
-import * as fs from 'original-fs';
 import * as path from 'path';
 import * as arrays from 'vs/base/common/arrays';
 import * as strings from 'vs/base/common/strings';
@@ -13,6 +12,7 @@ import * as paths from 'vs/base/common/paths';
 import * as platform from 'vs/base/common/platform';
 import * as types from 'vs/base/common/types';
 import { ParsedArgs } from 'vs/platform/environment/common/environment';
+import { realpathSync } from "vs/base/node/extfs";
 
 export function validatePaths(args: ParsedArgs): ParsedArgs {
 
@@ -43,7 +43,7 @@ function doValidatePaths(args: string[], gotoLineMode?: boolean): string[] {
 
 		let realPath: string;
 		try {
-			realPath = fs.realpathSync(pathCandidate);
+			realPath = realpathSync(pathCandidate);
 		} catch (error) {
 			// in case of an error, assume the user wants to create this file
 			// if the path is relative, we join it to the cwd

src/vs/workbench/services/files/node/watcher/unix/chokidarWatcherService.ts

@@ -15,7 +15,7 @@ import { TPromise } from 'vs/base/common/winjs.base';
 import { FileChangeType } from 'vs/platform/files/common/files';
 import { ThrottledDelayer } from 'vs/base/common/async';
 import strings = require('vs/base/common/strings');
-import { realpathSync } from 'vs/base/node/extfs';
+import { realcaseSync } from 'vs/base/node/extfs';
 import { isMacintosh } from 'vs/base/common/platform';
 import watcher = require('vs/workbench/services/files/node/watcher/common');
 import { IWatcherRequest, IWatcherService } from './watcher';
@@ -43,7 +43,7 @@ export class ChokidarWatcherService implements IWatcherService {
 		// so we have to find the real casing of the path and do some path massaging to fix this
 		// see https://github.com/paulmillr/chokidar/issues/418
 		const originalBasePath = request.basePath;
-		const realBasePath = isMacintosh ? (realpathSync(originalBasePath) || originalBasePath) : originalBasePath;
+		const realBasePath = isMacintosh ? (realcaseSync(originalBasePath) || originalBasePath) : originalBasePath;
 		const realBasePathLength = realBasePath.length;
 		const realBasePathDiffers = (originalBasePath !== realBasePath);