added pack3 command for dotnet (#4058)

src/dotnet/Program.cs

@@ -15,6 +15,7 @@ using Microsoft.DotNet.Tools.Compiler;
 using Microsoft.DotNet.Tools.Compiler.Csc;
 using Microsoft.DotNet.Tools.Help;
 using Microsoft.DotNet.Tools.New;
+using Microsoft.DotNet.Tools.Pack3;
 using Microsoft.DotNet.Tools.Publish;
 using Microsoft.DotNet.Tools.Restore;
 using Microsoft.DotNet.Tools.Restore3;
@@ -40,6 +41,7 @@ namespace Microsoft.DotNet.Cli
             ["build3"] = Build3Command.Run,
             ["run3"] = Run3Command.Run,
             ["restore3"] = Restore3Command.Run,
+            ["pack3"] = Pack3Command.Run,
         };
 
         public static int Main(string[] args)

src/dotnet/commands/dotnet-pack3/Pack3Command.cs

@@ -0,0 +1,87 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.DotNet.Cli;
+using Microsoft.DotNet.Cli.CommandLine;
+using Microsoft.DotNet.Cli.Utils;
+
+namespace Microsoft.DotNet.Tools.Pack3
+{
+    public class Pack3Command
+    {
+        public static int Run(string[] args)
+        {
+            DebugHelper.HandleDebugSwitch(ref args);
+
+            CommandLineApplication cmd = new CommandLineApplication(throwOnUnexpectedArg: false)
+            {
+                Name = "pack3",
+                FullName = "pack3",
+                Description = "pack for msbuild"
+            };
+
+            cmd.HelpOption("-h|--help");
+
+            var output = cmd.Option("-o|--output <OUTPUT_DIR>",
+                "Directory in which to place outputs",
+                CommandOptionType.SingleValue);
+            var noBuild = cmd.Option("--no-build",
+                "Do not build project before packing", 
+                CommandOptionType.NoValue);
+            var configuration = cmd.Option("-c|--configuration <CONFIGURATION>",
+                "Configuration under which to build", 
+                CommandOptionType.SingleValue);
+            var versionSuffix = cmd.Option("--version-suffix <VERSION_SUFFIX>",
+                "Defines what `*` should be replaced with in version field in project.json",
+                CommandOptionType.SingleValue);
+            var serviceable = cmd.Option("-s|--serviceable", 
+                "Set the serviceable flag in the package", 
+                CommandOptionType.NoValue);
+            var argRoot = cmd.Argument("<PROJECT>",
+                "The project to pack, defaults to the project file in the current directory. Can be a path to any project file",
+                multipleValues:true);
+
+            cmd.OnExecute(() =>
+            {
+                var msbuildArgs = new List<string>()
+                {
+                     "/t:pack"
+                };
+
+                if (noBuild.HasValue())
+                {
+                    msbuildArgs.Add($"/p:NoBuild=true");
+                }
+
+                if (output.HasValue())
+                {
+                    msbuildArgs.Add($"/p:PackageOutputPath={output.Value()}");
+                }
+
+                if (configuration.HasValue())
+                {
+                    msbuildArgs.Add($"/p:Configuration={configuration.Value()}");
+                }
+
+                if (versionSuffix.HasValue())
+                {
+                    msbuildArgs.Add($"/p:VersionSuffix={versionSuffix.Value()}");
+                }
+
+                if (serviceable.HasValue())
+                {
+                    msbuildArgs.Add($"/p:Serviceable=true");
+                }
+
+                msbuildArgs.AddRange(argRoot.Values);
+
+                msbuildArgs.AddRange(cmd.RemainingArguments);
+                return new MSBuildForwardingApp(msbuildArgs).Execute();
+            });
+
+            return cmd.Execute(args);
+        }
+    }
+}