Update with latest OmniSharp and pick correct version for current Linux distribution

We've updated OmniSharp to build releases for each Linux distribution that we currently support: CentOS, Debian, Red Hat (RHEL), and Ubuntu. This change adds code to sniff out which of the supported Linux distros we're running on to determine which flavor of OmniSharp we need to download and install.

Author: DustinCampbell

package.json

@@ -1,7 +1,7 @@
 {
   "name": "csharp",
   "publisher": "ms-vscode",
-  "version": "1.0.1-rc2",
+  "version": "1.0.2-rc2",
   "description": "C# for Visual Studio Code (powered by OmniSharp).",
   "displayName": "C#",
   "author": "Microsoft Corporation",

src/omnisharpDownload.ts

@@ -8,26 +8,39 @@
 import * as fs from 'fs-extra-promise';
 import * as path from 'path';
 import * as tmp from 'tmp';
+import {SupportedPlatform, getSupportedPlatform} from './utils';
 
 const Decompress = require('decompress');
 const Github = require('github-releases');
 
 const OmnisharpRepo = 'OmniSharp/omnisharp-roslyn';
-const OmnisharpVersion = 'v1.9-alpha10';
+const OmnisharpVersion = 'v1.9-alpha13';
 const DefaultInstallLocation = path.join(__dirname, '../.omnisharp');
 
 tmp.setGracefulCleanup();
 
 function getOmnisharpAssetName(): string {
-    switch (process.platform) {
-        case 'win32':
+    switch (getSupportedPlatform()) {
+        case SupportedPlatform.Windows:
             return 'omnisharp-win-x64-net451.zip';
-        case 'darwin':
+        case SupportedPlatform.OSX:
             return 'omnisharp-osx-x64-netcoreapp1.0.tar.gz';
-        case 'linux':
-            return 'omnisharp-linux-x64-netcoreapp1.0.tar.gz';
+        case SupportedPlatform.CentOS:
+            return 'omnisharp-centos-x64-netcoreapp1.0.tar.gz';
+        case SupportedPlatform.Debian:
+            return 'omnisharp-debian-x64-netcoreapp1.0.tar.gz';
+        case SupportedPlatform.RHEL:
+            return 'omnisharp-rhel-x64-netcoreapp1.0.tar.gz';
+        case SupportedPlatform.Ubuntu:
+            return 'omnisharp-ubuntu-x64-netcoreapp1.0.tar.gz';
+            
         default:
-            throw new Error(`Unsupported platform: ${process.platform}`);
+            if (process.platform === 'linux') {
+                throw new Error(`Unsupported linux distribution`);
+            }
+            else {
+                throw new Error(`Unsupported platform: ${process.platform}`);
+            }
     }
 }
 

src/utils.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import * as child_process from 'child_process'
+
+export enum SupportedPlatform {
+    None,
+    Windows,
+    OSX,
+    CentOS,
+    Debian,
+    RHEL,
+    Ubuntu
+}
+
+export function getSupportedPlatform() {
+    if (process.platform === 'win32') {
+        return SupportedPlatform.Windows;
+    }
+    else if (process.platform === 'darwin') {
+        return SupportedPlatform.OSX;
+    }
+    else if (process.platform === 'linux') {
+        // Get the text of /etc/*-release to discover which Linux distribution we're running on.
+        let release = child_process.execSync('cat /etc/*-release').toString().toLowerCase();
+
+        if (release.indexOf('ubuntu') >= 0) {
+            return SupportedPlatform.Ubuntu;
+        }
+        else if (release.indexOf('centos') >= 0) {
+            return SupportedPlatform.CentOS;
+        }
+        else if (release.indexOf('rhel') >= 0) {
+            return SupportedPlatform.RHEL;
+        }
+        else if (release.indexOf('debian') >= 0) {
+            return SupportedPlatform.Debian;
+        }
+    }
+
+    return SupportedPlatform.None;	
+}