Ron/bdc script (#4221)

* WIP adding scripting support.

* Adding deploy command along with additional env vars needed.

* Adding script generation that sets envars, kube context, and mssqlctl

* Adding test email for docker email envar until we update UI.

* Adding cluster platform detection and disabling generate script after first click.

* Fix spacing and adding comment.

extensions/big-data-cluster/src/scripting/scripting.ts

@@ -0,0 +1,72 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+import { fs } from '../utility/fs';
+import { Shell } from '../utility/shell';
+import * as vscode from 'vscode';
+import * as path from 'path';
+import mkdirp = require('mkdirp');
+import { Kubectl, baseKubectlPath } from '../kubectl/kubectl';
+import { KubectlContext } from '../kubectl/kubectlUtils';
+
+ export interface Scriptable {
+		getScriptProperties(): Promise<ScriptingDictionary<string>>;
+		getTargetKubectlContext() : KubectlContext;
+ }
+
+ export interface ScriptingDictionary<V> {
+	[name: string]: V;
+}
+
+const deployFilePrefix : string = 'mssql-bdc-deploy';
+export class ScriptGenerator {
+
+	private _shell: Shell;
+	private _kubectl: Kubectl;
+
+	private _kubectlPath: string;
+	constructor(_kubectl: Kubectl) {
+		this._kubectl = _kubectl;
+		this._shell = this._kubectl.getContext().shell;
+		this._kubectlPath = baseKubectlPath(this._kubectl.getContext());
+	}
+
+	public async generateDeploymentScript(scriptable: Scriptable) : Promise<void> {
+		let targetClusterName = scriptable.getTargetKubectlContext().clusterName;
+		let targetContextName = scriptable.getTargetKubectlContext().contextName;
+
+		let timestamp = new Date().getTime();
+		let deployFolder = this.getDeploymentFolder(this._shell);
+		let deployFileSuffix = this._shell.isWindows() ? `.bat` : `.sh`;
+		let deployFileName = `${deployFilePrefix}-${targetClusterName}-${timestamp}${deployFileSuffix}`;
+		let deployFilePath = path.join(deployFolder, deployFileName);
+
+		let envVars = "";
+		let propertiesDict = await scriptable.getScriptProperties();
+		for (let key in propertiesDict) {
+			let value = propertiesDict[key];
+			envVars += this._shell.isWindows() ? `Set ${key} = ${value}\n` : `export ${key} = ${value}\n`;
+		}
+		envVars += '\n';
+
+		let kubeContextcommand = `${this._kubectlPath} config use-context ${targetContextName}\n`;
+		// Todo: The API for mssqlctl may change per version, so need a version check to use proper syntax.
+		let deployCommand = `mssqlctl create cluster ${targetClusterName}\n`;
+
+		let deployContent = envVars + kubeContextcommand + deployCommand;
+
+		mkdirp.sync(deployFolder);
+		await fs.writeFile(deployFilePath, deployContent, handleError);
+	}
+
+	public getDeploymentFolder(shell: Shell): string {
+		return path.join(shell.home(), `.mssql-bdc/deployment`);
+	}
+}
+
+const handleError = (err: NodeJS.ErrnoException) => {
+    if (err) {
+        vscode.window.showErrorMessage(err.message);
+    }
+};