Fix handling of unknown Linux distributions (#912)

This checkin fixes the behavior of the C# extension if we are on a Linux distribution that we don't understand or support. Before we would attempt to download every different x64 package, and then show a very generic error message.

Author: gregg-miskelly

src/coreclr-debug/activate.ts

@@ -9,6 +9,7 @@ import TelemetryReporter from 'vscode-extension-telemetry';
 import { CoreClrDebugUtil, DotnetInfo, } from './util';
 import * as debugInstall from './install';
 import { Logger } from './../logger';
+import { PlatformInformation } from './../platform';
 
 let _debugUtil: CoreClrDebugUtil = null;
 let _reporter: TelemetryReporter = null;
@@ -20,9 +21,22 @@ export function activate(context: vscode.ExtensionContext, reporter: TelemetryRe
     _logger = logger;
 
     if (!CoreClrDebugUtil.existsSync(_debugUtil.debugAdapterDir())) {
-        // We have been activated but it looks like our package was not installed. This is bad.
-        logger.appendLine("[ERROR]: C# Extension failed to install the debugger package");
-        showInstallErrorMessage();
+        PlatformInformation.GetCurrent().then((info) => {
+            if (info.runtimeId) {
+                logger.appendLine("[ERROR]: C# Extension failed to install the debugger package");
+                showInstallErrorMessage();
+            } else {
+                if (info.isLinux) { 
+                    logger.appendLine(`[WARNING]: The current Linux distribution '${info.distribution.name}' version '${info.distribution.version}' is not currently supported by the .NET Core debugger. Debugging will not be available.`);
+                } else {
+                    logger.appendLine(`[WARNING]: The current operating system is not currently supported by the .NET Core debugger. Debugging will not be available.`);
+                }
+            }
+        }, (err) => {
+            // Somehow we couldn't figure out the platform we are on
+            logger.appendLine("[ERROR]: C# Extension failed to install the debugger package");
+            showInstallErrorMessage();
+        });
     } else if (!CoreClrDebugUtil.existsSync(_debugUtil.installCompleteFilePath())) {
         _debugUtil.checkDotNetCli()
             .then((dotnetInfo: DotnetInfo) => {

src/packages.ts

@@ -92,8 +92,10 @@ export class PackageManager {
         return this.GetAllPackages()
             .then(list => {
                 return list.filter(pkg => {
-                    if (pkg.runtimeIds && this.platformInfo.runtimeId && pkg.runtimeIds.indexOf(this.platformInfo.runtimeId) === -1) {
-                        return false;
+                    if (pkg.runtimeIds) {
+                        if (!this.platformInfo.runtimeId || pkg.runtimeIds.indexOf(this.platformInfo.runtimeId) === -1) {
+                            return false;
+                        }
                     }
 
                     if (pkg.architectures && pkg.architectures.indexOf(this.platformInfo.architecture) === -1) {