[UseDotNetV2] Update task to node16 using codegen

Tasks/UseDotNetV2/_buildConfigs/Node16/FilesOverriddenForConfigGoHereREADME.txt

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+Place files overridden for this config in this directory

Tasks/UseDotNetV2/_buildConfigs/Node16/Tests/globaljsonfetcherTest.ts

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+"use strict";
+import * as tl from 'azure-pipelines-task-lib/task';
+import { GlobalJson } from "../globaljsonfetcher";
+import { Buffer } from "buffer";
+import { VersionInfo } from '../models';
+import { Promise } from 'q';
+import fs = require('fs');
+var mockery = require('mockery');
+
+const workingDir: string = "work/";
+const validRootGlobalJson = workingDir + "global.json";
+const rootVersionNumber = "2.2.2";
+const workingSubDir = workingDir + "testdir/";
+const validSubDirGlobalJson = workingSubDir + "global.json";
+const subDirVersionNumber = "3.0.0-pre285754637";
+const pathToEmptyGlobalJsonDir = workingDir + "empty/";
+const pathToEmptyGlobalJson = pathToEmptyGlobalJsonDir + "global.json";
+
+//setup mocks
+mockery.enable({
+    useCleanCache: true,
+    warnOnReplace: false,
+    warnOnUnregistered: false
+});
+
+mockery.registerMock('azure-pipelines-task-lib/task', {
+    findMatch: function (path: string, searchPattern: string): string[] {
+        if (searchPattern != "**/global.json") {
+            return [];
+        }
+        if (path == workingDir) {
+            // If it's working dir subdir is included, because it is a child;
+            return [validRootGlobalJson, validSubDirGlobalJson];
+        }
+        if (path == workingSubDir) {
+            return [validSubDirGlobalJson];
+        }
+        if (path == pathToEmptyGlobalJsonDir) {
+            return [pathToEmptyGlobalJson];
+        }
+        return [];
+    },
+    loc: function (locString, ...param: string[]) { return tl.loc(locString, param); },
+    debug: function (message) { return tl.debug(message); }
+});
+
+mockery.registerMock('fs', {
+    ...fs,
+    readFileSync: function (path: string): Buffer {
+        if (path == validRootGlobalJson) {
+            var globalJson = new GlobalJson(rootVersionNumber);
+            return Buffer.from(JSON.stringify(globalJson));
+        }
+        if (path == validSubDirGlobalJson) {
+            var globalJson = new GlobalJson(subDirVersionNumber);
+            return Buffer.from(JSON.stringify(globalJson));
+        }
+        if (path == pathToEmptyGlobalJson) {
+            return Buffer.from("");
+        }
+        return Buffer.from(null);
+    }
+});
+
+mockery.registerMock('./versionfetcher', {
+    DotNetCoreVersionFetcher: function (explicitVersioning: boolean = false) {
+        return {
+            getVersionInfo: function (versionSpec: string, vsVersionSpec: string, packageType: string, includePreviewVersions: boolean): Promise<VersionInfo> {
+                return Promise<VersionInfo>((resolve, reject) => {
+                    resolve(new VersionInfo({ 
+                        version: versionSpec, 
+                        files: [{
+                            name: 'testfile.json',
+                            hash: 'testhash',
+                            url: 'testurl',
+                            rid: 'testrid'
+                        }],
+                        "runtime-version": versionSpec,
+                        "vs-version": vsVersionSpec 
+                    }, packageType));
+                });
+            }
+        }
+    }
+
+});
+
+// start test
+import { globalJsonFetcher } from "../globaljsonfetcher";
+if (process.env["__case__"] == "subdirAsRoot") {
+    let fetcher = new globalJsonFetcher(workingSubDir);
+    fetcher.GetVersions().then(versionInfos => {
+        if (versionInfos.length != 1) {
+            throw "GetVersions should return one result if one global.json is found.";
+        }
+        if (versionInfos[0].getVersion() != subDirVersionNumber) {
+            throw `GetVersions should return the version number that was inside the global.json. Expected: ${subDirVersionNumber} Actual: ${versionInfos[0].getVersion()}`;
+        }
+        if (versionInfos[0].getPackageType() != 'sdk') {
+            throw `GetVersions return always 'sdk' as package type. Actual: ${versionInfos[0].getPackageType()}`;
+        }
+    });
+}
+
+if (process.env["__case__"] == "rootAsRoot") {
+    let fetcher = new globalJsonFetcher(workingDir);
+    fetcher.GetVersions().then(versionInfos => {
+        if (versionInfos.length != 2) {
+            throw "GetVersions should return all global.json in a folder hierarchy result if multiple global.json are found.";
+        }
+    });
+}
+
+if (process.env["__case__"] == "invalidDir") {
+    let fetcher = new globalJsonFetcher("invalidDir");
+    fetcher.GetVersions().then(versionInfos => {
+        throw "GetVersions shouldn't success if no matching version was found.";
+    }, err => {
+        // here we are good because the getVersion throw an error.
+        return;
+    });
+}
+
+if (process.env["__case__"] == "emptyGlobalJson") {
+    let fetcher = new globalJsonFetcher(pathToEmptyGlobalJsonDir);
+    fetcher.GetVersions().then(versionInfos => {
+        if (versionInfos == null) {
+            throw "GetVersions shouldn't return null if the global.json is empty.";
+        }
+        if (versionInfos.length != 0) {
+            throw "GetVersions shouldn't return a arry with 0 elements if global.json is empty.";
+        }
+    }, err => {
+        throw "GetVersions shouldn't throw an error if global.json is empty.";
+    });
+}

Tasks/UseDotNetV2/_buildConfigs/Node16/globaljsonfetcher.ts

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+"use strict";
+import * as fileSystem from "fs";
+import * as tl from 'azure-pipelines-task-lib/task';
+import { DotNetCoreVersionFetcher } from "./versionfetcher";
+import { VersionInfo } from "./models";
+
+export class globalJsonFetcher {
+
+    private workingDirectory: string;
+    private versionFetcher: DotNetCoreVersionFetcher = new DotNetCoreVersionFetcher(true);
+    /**
+     * The global json fetcher provider functionality to extract the version information from all global json in the working directory.
+     * @param workingDirectory
+     */
+    constructor(workingDirectory: string) {
+        this.workingDirectory = workingDirectory;
+    }
+
+    /**
+     * Get all version information from all global.json starting from the working directory without duplicates.
+     */
+    public async GetVersions(): Promise<VersionInfo[]> {
+        var versionInformation: VersionInfo[] = new Array<VersionInfo>();
+        var versionStrings = this.getVersionStrings();
+        for (let index = 0; index < versionStrings.length; index++) {
+            const version = versionStrings[index];
+            if (version != null) {
+                var versionInfo = await this.versionFetcher.getVersionInfo(version, null, "sdk", false);
+                versionInformation.push(versionInfo);
+            }
+        }
+
+        return Array.from(new Set(versionInformation)); // this remove all not unique values.
+    }
+
+    private getVersionStrings(): Array<string | null> {
+        let filePathsToGlobalJson = tl.findMatch(this.workingDirectory, "**/global.json");
+        if (filePathsToGlobalJson == null || filePathsToGlobalJson.length == 0) {
+            throw tl.loc("FailedToFindGlobalJson", this.workingDirectory);
+        }
+
+        return filePathsToGlobalJson.map(path => {
+            var content = this.readGlobalJson(path);
+            if (content != null) {
+                tl.loc("GlobalJsonSdkVersion", content.sdk.version, path);
+                return content.sdk.version;
+            }
+
+            return null;
+        })
+            .filter(d => d != null); // remove all global.json that can't read
+    }
+
+    private readGlobalJson(path: string): GlobalJson | null {
+        let globalJson: GlobalJson | null = null;
+        tl.loc("GlobalJsonFound", path);
+        try {
+            let fileContent = fileSystem.readFileSync(path);
+            // Since here is a buffer, we need to check length property to determine if it is empty. 
+            if (!fileContent.length) {
+            // do not throw if globa.json is empty, task need not install any version in such case.
+                tl.loc("GlobalJsonIsEmpty", path);
+                return null;
+            }
+
+            globalJson = (JSON.parse(fileContent.toString())) as { sdk: { version: string } };
+        } catch (error) {
+            // we throw if the global.json is invalid
+            throw tl.loc("FailedToReadGlobalJson", path, error); // We don't throw if a global.json is invalid.
+        }
+
+        if (globalJson == null || globalJson.sdk == null || globalJson.sdk.version == null) {
+            tl.loc("FailedToReadGlobalJson", path);
+            return null;
+        }
+
+        return globalJson;
+    }
+
+}
+
+export class GlobalJson {
+    constructor(version: string | null = null) {
+        if (version != null) {
+            this.sdk = new sdk();
+            this.sdk.version = version;
+        }
+    }
+    public sdk: sdk;
+}
+
+class sdk {
+    public version: string;
+}