Remove all uses of fs.exists as it is deprecated

The tests still use it in places - particular localfilesystem tests,
but those tests need to be redone with sinon stubbing in place and
not rely on real fs operations.

red/runtime/index.js

@@ -28,18 +28,25 @@ var fs = require("fs");
 var runtimeMetricInterval = null;
 
 function init(userSettings) {
-    userSettings.version = version();
+    userSettings.version = getVersion();
     log.init(userSettings);
     settings.init(userSettings);
 }
 
-function version() {
-    var p = require(path.join(__dirname,"..","..","package.json")).version;
-    /* istanbul ignore else */
-    if (fs.existsSync(path.join(__dirname,"..","..",".git"))) {
-        p += "-git";
+var version;
+
+function getVersion() {
+    if (!version) {
+        version = require(path.join(__dirname,"..","..","package.json")).version;
+        /* istanbul ignore else */
+        try {
+            fs.statSync(path.join(__dirname,"..","..",".git"));
+            version += "-git";
+        } catch(err) {
+            // No git directory
+        }
     }
-    return p;
+    return version;
 }
 
 function start() {
@@ -142,7 +149,7 @@ var runtime = module.exports = {
     start: start,
     stop: stop,
 
-    version: version,
+    version: getVersion,
 
     log: log,
     i18n: i18n,

red/runtime/nodes/registry/installer.js

@@ -40,7 +40,7 @@ function checkModulePath(folder) {
     var err;
     var fullPath = path.resolve(folder);
     var packageFile = path.join(fullPath,'package.json');
-    if (fs.existsSync(packageFile)) {
+    try {
         var pkg = require(packageFile);
         moduleName = pkg.name;
         if (!pkg['node-red']) {
@@ -49,7 +49,7 @@ function checkModulePath(folder) {
             err.code = 'invalid_module';
             throw err;
         }
-    } else {
+    } catch(err2) {
         err = new Error("Module not found");
         err.code = 404;
         throw err;
@@ -151,7 +151,10 @@ function uninstallModule(module) {
         }
         var installDir = settings.userDir || process.env.NODE_RED_HOME || ".";
         var moduleDir = path.join(installDir,"node_modules",module);
-        if (!fs.existsSync(moduleDir)) {
+
+        try {
+            fs.statSync(moduleDir);
+        } catch(err) {
             return reject(new Error(log._("server.install.uninstall-failed",{name:module})));
         }
 

red/runtime/nodes/registry/localfilesystem.js

@@ -49,16 +49,17 @@ function getLocalFile(file) {
     if (isExcluded(path.basename(file))) {
         return null;
     }
-    if (fs.existsSync(file.replace(/\.js$/,".html"))) {
+    try {
+        fs.statSync(file.replace(/\.js$/,".html"));
         return {
             file:    file,
             module:  "node-red",
             name:    path.basename(file).replace(/^\d+-/,"").replace(/\.js$/,""),
             version: settings.version
         };
+    } catch(err) {
+        return null;
     }
-    return null;
-
 }
 
 
@@ -175,9 +176,11 @@ function getModuleNodeFiles(module) {
             });
             var iconDir = path.join(moduleDir,path.dirname(nodes[n]),"icons");
             if (iconDirs.indexOf(iconDir) == -1) {
-                if (fs.existsSync(iconDir)) {
+                try {
+                    fs.statSync(iconDir);
                     events.emit("node-icon-dir",iconDir);
                     iconDirs.push(iconDir);
+                } catch(err) {
                 }
             }
         }

red/runtime/storage/localfilesystem.js

@@ -128,9 +128,10 @@ var localfilesystem = {
         var promises = [];
 
         if (!settings.userDir) {
-            if (fs.existsSync(fspath.join(process.env.NODE_RED_HOME,".config.json"))) {
+            try {
+                fs.statSync(fspath.join(process.env.NODE_RED_HOME,".config.json"));
                 settings.userDir = process.env.NODE_RED_HOME;
-            } else {
+            } catch(err) {
                 settings.userDir = fspath.join(process.env.HOME || process.env.HOMEPATH || process.env.USERPROFILE || process.env.NODE_RED_HOME,".node-red");
                 if (!settings.readOnly) {
                     promises.push(promiseDir(settings.userDir));
@@ -148,10 +149,11 @@ var localfilesystem = {
                 // Relative to cwd
                 flowsFullPath = fspath.join(process.cwd(),flowsFile);
             } else {
-                if (fs.existsSync(fspath.join(process.cwd(),flowsFile))) {
+                try {
+                    fs.statSync(fspath.join(process.cwd(),flowsFile));
                     // Found in cwd
                     flowsFullPath = fspath.join(process.cwd(),flowsFile);
-                } else {
+                } catch(err) {
                     // Use userDir
                     flowsFullPath = fspath.join(settings.userDir,flowsFile);
                 }
@@ -191,15 +193,12 @@ var localfilesystem = {
         return when.promise(function(resolve) {
             log.info(log._("storage.localfilesystem.user-dir",{path:settings.userDir}));
             log.info(log._("storage.localfilesystem.flows-file",{path:flowsFullPath}));
-            fs.exists(flowsFullPath, function(exists) {
-                if (exists) {
-                    resolve(nodeFn.call(fs.readFile,flowsFullPath,'utf8').then(function(data) {
-                        return JSON.parse(data);
-                    }));
-                } else {
-                    log.info(log._("storage.localfilesystem.create"));
-                    resolve([]);
+            fs.readFile(flowsFullPath,'utf8',function(err,data) {
+                if (!err) {
+                    return resolve(JSON.parse(data));
                 }
+                log.info(log._("storage.localfilesystem.create"));
+                resolve([]);
             });
         });
     },
@@ -209,8 +208,9 @@ var localfilesystem = {
             return when.resolve();
         }
 
-        if (fs.existsSync(flowsFullPath)) {
+        try {
             fs.renameSync(flowsFullPath,flowsFileBackup);
+        } catch(err) {
         }
 
         var flowData;
@@ -225,17 +225,13 @@ var localfilesystem = {
 
     getCredentials: function() {
         return when.promise(function(resolve) {
-            fs.exists(credentialsFile, function(exists) {
-                if (exists) {
-                    resolve(nodeFn.call(fs.readFile, credentialsFile, 'utf8').then(function(data) {
-                        return JSON.parse(data)
-                    }));
+            fs.readFile(credentialsFile,'utf8',function(err,data) {
+                if (!err) {
+                    resolve(JSON.parse(data));
                 } else {
-                    fs.exists(oldCredentialsFile, function(exists) {
-                        if (exists) {
-                            resolve(nodeFn.call(fs.readFile, oldCredentialsFile, 'utf8').then(function(data) {
-                                return JSON.parse(data)
-                            }));
+                    fs.readFile(oldCredentialsFile,'utf8',function(err,data) {
+                        if (!err) {
+                            resolve(JSON.parse(data));
                         } else {
                             resolve({});
                         }
@@ -250,8 +246,9 @@ var localfilesystem = {
             return when.resolve();
         }
 
-        if (fs.existsSync(credentialsFile)) {
+        try {
             fs.renameSync(credentialsFile,credentialsFileBackup);
+        } catch(err) {
         }
         var credentialData;
         if (settings.flowFilePretty) {
@@ -263,21 +260,18 @@ var localfilesystem = {
     },
 
     getSettings: function() {
-        if (fs.existsSync(globalSettingsFile)) {
-            return nodeFn.call(fs.readFile,globalSettingsFile,'utf8').then(function(data) {
-                if (data) {
+        return when.promise(function(resolve,reject) {
+            fs.readFile(globalSettingsFile,'utf8',function(err,data) {
+                if (!err) {
                     try {
-                        return JSON.parse(data);
-                    } catch(err) {
+                        return resolve(JSON.parse(data));
+                    } catch(err2) {
                         log.trace("Corrupted config detected - resetting");
-                        return {};
                     }
-                } else {
-                    return {};
                 }
-            });
-        }
-        return when.resolve({});
+                return resolve({});
+            })
+        })
     },
     saveSettings: function(settings) {
         if (settings.readOnly) {
@@ -286,21 +280,18 @@ var localfilesystem = {
         return writeFile(globalSettingsFile,JSON.stringify(settings,null,1));
     },
     getSessions: function() {
-        if (fs.existsSync(sessionsFile)) {
-            return nodeFn.call(fs.readFile,sessionsFile,'utf8').then(function(data) {
-                if (data) {
+        return when.promise(function(resolve,reject) {
+            fs.readFile(sessionsFile,'utf8',function(err,data){
+                if (!err) {
                     try {
-                        return JSON.parse(data);
-                    } catch(err) {
+                        return resolve(JSON.parse(data));
+                    } catch(err2) {
                         log.trace("Corrupted sessions file - resetting");
-                        return {};
                     }
-                } else {
-                    return {};
                 }
-            });
-        }
-        return when.resolve({});
+                resolve({});
+            })
+        });
     },
     saveSessions: function(sessions) {
         if (settings.readOnly) {