async function run() {
    try {
        taskLib.setResourcePath(path.join(__dirname, 'task.json'));

        const versionSpec = taskLib.getInput('versionSpec', false) || DEFAULT_NUGET_VERSION;
        const checkLatest = taskLib.getBoolInput('checkLatest', false);
        await nuGetGetter.getNuGet(versionSpec, checkLatest, true);
    } catch (error) {
        console.error('ERR:' + error.message);
        taskLib.setResult(taskLib.TaskResult.Failed, '');
    }
}

 public static async installNuGet(version: string) {
     try {
         const proxy: tl.ProxyConfiguration = tl.getHttpProxyConfiguration();
         if (proxy) {
             console.log(tl.loc("InstallingNuGetVersion", version));
             await nuGetGetter.getNuGet(version, false, true);
             NuGetInstaller.setProxy(proxy);
         }
     }
     catch (error) {
         throw tl.loc("FailureWhileInstallingNuGetVersion", version, error.message);
     }
 }

async function main(): Promise<void> {
    tl.setResourcePath(path.join(__dirname, "task.json"));

    // Getting NuGet
    tl.debug("Getting NuGet");
    let nuGetPath: string;
    let nugetVersion: string;
    try {
        nuGetPath = tl.getVariable(nuGetGetter.NUGET_EXE_TOOL_PATH_ENV_VAR)
                    || tl.getVariable(NUGET_EXE_CUSTOM_LOCATION);
        if (!nuGetPath) {
            const cachedVersionToUse = await nuGetGetter.cacheBundledNuGet();
            nuGetPath = await nuGetGetter.getNuGet(cachedVersionToUse);
        }
        const nugetVersionInfo: VersionInfo = await peParser.getFileVersionInfoAsync(nuGetPath);
        if (nugetVersionInfo && nugetVersionInfo.fileVersion){
            nugetVersion = nugetVersionInfo.fileVersion.toString();
        }
    }
    catch (error) {
        tl.setResult(tl.TaskResult.Failed, error.message);
        return;
    } finally{
        _logNugetStartupVariables(nuGetPath, nugetVersion);
    }

    const nugetCommand = tl.getInput("command", true);
    switch (nugetCommand) {
        case "restore":
            nugetRestore.run(nuGetPath);
            break;
        case "pack":
            nugetPack.run(nuGetPath);
            break;
        case "push":
            nugetPublish.run(nuGetPath);
            break;
        case "custom":
            nugetCustom.run(nuGetPath);
            break;
        default:
            tl.setResult(tl.TaskResult.Failed, tl.loc("Error_CommandNotRecognized", nugetCommand));
            break;
    }
}

async function main(): Promise<void> {
    let packagingLocation: pkgLocationUtils.PackagingLocation;
    try {
        packagingLocation = await pkgLocationUtils.getPackagingUris(pkgLocationUtils.ProtocolType.NuGet);
    } catch (error) {
        tl.debug("Unable to get packaging URIs, using default collection URI");
        tl.debug(JSON.stringify(error));
        const collectionUrl = tl.getVariable("System.TeamFoundationCollectionUri");
        packagingLocation = {
            PackagingUris: [collectionUrl],
            DefaultPackagingUri: collectionUrl};
    }

    let buildIdentityDisplayName: string = null;
    let buildIdentityAccount: string = null;

    try {
        tl.setResourcePath(path.join(__dirname, "task.json"));

        nutil.setConsoleCodePage();

        // read inputs
        let solution = tl.getPathInput("solution", true, false);
        let filesList = nutil.resolveFilterSpec(
            solution,
            tl.getVariable("System.DefaultWorkingDirectory") || process.cwd());
        filesList.forEach(solutionFile => {
            if (!tl.stats(solutionFile).isFile()) {
                throw new Error(tl.loc("NotARegularFile", solutionFile));
            }
        });

        let noCache = tl.getBoolInput("noCache");
        let nuGetRestoreArgs = tl.getInput("nuGetRestoreArgs");
        let verbosity = tl.getInput("verbosity");

        let restoreMode = tl.getInput("restoreMode") || "Restore";
        // normalize the restore mode for display purposes, and ensure it's a known one
        let normalizedRestoreMode = ["restore", "install"].find(x => restoreMode.toUpperCase() === x.toUpperCase());
        if (!normalizedRestoreMode) {
            throw new Error(tl.loc("UnknownRestoreMode", restoreMode));
        }

        restoreMode = normalizedRestoreMode;

        let nugetConfigPath = tl.getPathInput("nugetConfigPath", false, true);
        if (!tl.filePathSupplied("nugetConfigPath")) {
            nugetConfigPath = null;
        }

        let nugetUxOption = tl.getInput('nuGetVersion');

        // due to a bug where we accidentally allowed nuGetPath to be surrounded by quotes before,
        // locateNuGetExe() will strip them and check for existence there.
        let nuGetPath = tl.getPathInput("nuGetPath", false, false);
        let userNuGetProvided = false;
        if(nuGetPath !== null && tl.filePathSupplied("nuGetPath")){
            nuGetPath = nutil.stripLeadingAndTrailingQuotes(nuGetPath);
            // True if the user provided their own version of NuGet
            userNuGetProvided = true;
            if (nugetUxOption !== "custom"){
                // For back compat, if a path has already been specificed then use it.
                // However warn the user in the build of this behavior
                tl.warning(tl.loc("Warning_ConflictingNuGetPreference"));
            }
        }
        else {
            if (nugetUxOption === "custom")
            {
                throw new Error(tl.loc("NoNuGetSpecified"))
            }
            // Pull the pre-installed path for NuGet.
            let nuGetPathSuffix: string;
            let versionToUse: string;
            if (nugetUxOption === "4.0.0.2283") {
                nuGetPathSuffix = "NuGet/4.0.0/";
                versionToUse = "4.0.0";
            }
            else if (nugetUxOption === "3.5.0.1829") {
                nuGetPathSuffix = "NuGet/3.5.0/";
                versionToUse = "3.5.0";
            }
            else if (nugetUxOption === "3.3.0") {
                nuGetPathSuffix = "NuGet/3.3.0/";
                versionToUse = "3.3.0";
            }
            else {
                throw new Error(tl.loc("NGCommon_UnabletoDetectNuGetVersion"));
            }

            // save and reset the tool path env var, so this task doesn't act as a tool installer
            const tempNuGetPath = tl.getVariable(ngToolGetter.NUGET_EXE_TOOL_PATH_ENV_VAR);
            const cachedVersion = await ngToolGetter.cacheBundledNuGet(versionToUse, nuGetPathSuffix);
            nuGetPath = await ngToolGetter.getNuGet(cachedVersion);
            tl.setVariable(ngToolGetter.NUGET_EXE_TOOL_PATH_ENV_VAR, tempNuGetPath);
        }
        //find nuget location to use
        let credProviderPath = nutil.locateCredentialProvider();

        const quirks = await ngToolRunner.getNuGetQuirksAsync(nuGetPath);
//.........这里部分代码省略.........