Update tf.exe

src/Agent.Plugins/TFCliManager.cs

@@ -12,6 +12,7 @@
 using System.Xml;
 using System.Security.Cryptography.X509Certificates;
 using Microsoft.VisualStudio.Services.Agent.Util;
+using Agent.Sdk.Knob;
 
 namespace Agent.Plugins.Repository
 {
@@ -37,11 +38,15 @@ public override TfsVCFeatures Features
 
         public static readonly int RetriesOnFailure = 3;
 
-        public string FilePath => Path.Combine(ExecutionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf", "tf.exe");
+        private string TfPath => AgentKnobs.InstallLegacyTfExe.GetValue(ExecutionContext).AsBoolean()
+            ? Path.Combine(ExecutionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf-legacy")
+            : Path.Combine(ExecutionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf");
 
-        private string AppConfigFile => Path.Combine(ExecutionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf", "tf.exe.config");
+        public string FilePath => Path.Combine(TfPath, "tf.exe");
 
-        private string AppConfigRestoreFile => Path.Combine(ExecutionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf", "tf.exe.config.restore");
+        private string AppConfigFile => Path.Combine(TfPath, "tf.exe.config");
+
+        private string AppConfigRestoreFile => Path.Combine(TfPath, "tf.exe.config.restore");
 
         // TODO: Remove AddAsync after last-saved-checkin-metadata problem is fixed properly.
         public async Task AddAsync(string localPath)

src/Agent.Plugins/TfsVCSourceProvider.cs

@@ -101,7 +101,8 @@ public async Task GetSourceAsync(
             if (PlatformUtil.RunningOnWindows)
             {
                 // Set TFVC_BUILDAGENT_POLICYPATH
-                string policyDllPath = Path.Combine(executionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", "tf", "Microsoft.TeamFoundation.VersionControl.Controls.dll");
+                string tfDirectoryName = AgentKnobs.InstallLegacyTfExe.GetValue(executionContext).AsBoolean() ? "tf-legacy" : "tf";
+                string policyDllPath = Path.Combine(executionContext.Variables.GetValueOrDefault("Agent.HomeDirectory")?.Value, "externals", tfDirectoryName, "Microsoft.TeamFoundation.VersionControl.Controls.dll");
                 ArgUtil.File(policyDllPath, nameof(policyDllPath));
                 const string policyPathEnvKey = "TFVC_BUILDAGENT_POLICYPATH";
                 executionContext.Output(StringUtil.Loc("SetEnvVar", policyPathEnvKey));

src/Agent.Sdk/Knob/AgentKnobs.cs

@@ -758,5 +758,12 @@ public class AgentKnobs
             "Use PowerShell script wrapper to handle PowerShell ConstrainedLanguage mode.",
             new PipelineFeatureSource("UsePSScriptWrapper"),
             new BuiltInDefaultKnobSource("false"));
+
+        public static readonly Knob InstallLegacyTfExe = new Knob(
+            nameof(InstallLegacyTfExe),
+            "If true, agent will install the previous version of TF.exe in the tf-legacy and vstsom-legacy directories",
+            new RuntimeKnobSource("AGENT_INSTALL_LEGACY_TF_EXE"),
+            new EnvironmentKnobSource("AGENT_INSTALL_LEGACY_TF_EXE"),
+            new BuiltInDefaultKnobSource("false"));
     }
 }

src/Agent.Worker/Build/TFCommandManager.cs

@@ -11,6 +11,7 @@
 using System.Text;
 using System.Xml;
 using System.Security.Cryptography.X509Certificates;
+using Agent.Sdk.Knob;
 
 namespace Microsoft.VisualStudio.Services.Agent.Worker.Build
 {
@@ -34,11 +35,15 @@ public override TfsVCFeatures Features
 
         protected override string Switch => "/";
 
-        public override string FilePath => Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Tf), "tf.exe");
+        private string TfPath => AgentKnobs.InstallLegacyTfExe.GetValue(ExecutionContext).AsBoolean()
+            ? HostContext.GetDirectory(WellKnownDirectory.TfLegacy)
+            : HostContext.GetDirectory(WellKnownDirectory.Tf);
 
-        private string AppConfigFile => Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Tf), "tf.exe.config");
+        public override string FilePath => Path.Combine(TfPath, "tf.exe");
 
-        private string AppConfigRestoreFile => Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Tf), "tf.exe.config.restore");
+        private string AppConfigFile => Path.Combine(TfPath, "tf.exe.config");
+
+        private string AppConfigRestoreFile => Path.Combine(TfPath, "tf.exe.config.restore");
 
         // TODO: Remove AddAsync after last-saved-checkin-metadata problem is fixed properly.
         public async Task AddAsync(string localPath)

src/Agent.Worker/Build/TfsVCSourceProvider.cs

@@ -17,6 +17,7 @@
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using Agent.Sdk.Knob;
 
 namespace Microsoft.VisualStudio.Services.Agent.Worker.Build
 {
@@ -88,7 +89,11 @@ public async Task GetSourceAsync(
             if (PlatformUtil.RunningOnWindows)
             {
                 // Set TFVC_BUILDAGENT_POLICYPATH
-                string policyDllPath = Path.Combine(HostContext.GetDirectory(WellKnownDirectory.ServerOM), "Microsoft.TeamFoundation.VersionControl.Controls.dll");
+                string vstsomPath = AgentKnobs.InstallLegacyTfExe.GetValue(executionContext).AsBoolean()
+                    ? HostContext.GetDirectory(WellKnownDirectory.ServerOMLegacy)
+                    : HostContext.GetDirectory(WellKnownDirectory.ServerOM);
+
+                string policyDllPath = Path.Combine(vstsomPath, "Microsoft.TeamFoundation.VersionControl.Controls.dll");
                 ArgUtil.File(policyDllPath, nameof(policyDllPath));
                 const string policyPathEnvKey = "TFVC_BUILDAGENT_POLICYPATH";
                 executionContext.Output(StringUtil.Loc("SetEnvVar", policyPathEnvKey));

src/Agent.Worker/Handlers/LegacyPowerShellHandler.cs

@@ -12,6 +12,7 @@
 using Microsoft.VisualStudio.Services.WebApi;
 using System.Xml;
 using Microsoft.TeamFoundation.DistributedTask.Pipelines;
+using Agent.Sdk.Knob;
 
 namespace Microsoft.VisualStudio.Services.Agent.Worker.Handlers
 {
@@ -205,8 +206,13 @@ public async Task RunAsync()
 
             // Copy the OM binaries into the legacy host folder.
             ExecutionContext.Output(StringUtil.Loc("PrepareTaskExecutionHandler"));
+
+            string sourceDirectory = AgentKnobs.InstallLegacyTfExe.GetValue(ExecutionContext).AsBoolean()
+                ? HostContext.GetDirectory(WellKnownDirectory.ServerOMLegacy)
+                : HostContext.GetDirectory(WellKnownDirectory.ServerOM);
+
             IOUtil.CopyDirectory(
-                source: HostContext.GetDirectory(WellKnownDirectory.ServerOM),
+                source: sourceDirectory,
                 target: HostContext.GetDirectory(WellKnownDirectory.LegacyPSHost),
                 cancellationToken: ExecutionContext.CancellationToken);
             Trace.Info("Finished copying files.");

src/Agent.Worker/JobExtension.cs

@@ -265,6 +265,11 @@ public async Task<List<IStep>> InitializeJob(IExecutionContext jobContext, Pipel
                         }
                     }
 
+                    if (AgentKnobs.InstallLegacyTfExe.GetValue(jobContext).AsBoolean())
+                    {
+                        await TfUtil.DownloadTfLegacyAsync(context);
+                    }
+
                     // build up 3 lists of steps, pre-job, job, post-job
                     Stack<IStep> postJobStepsBuilder = new Stack<IStep>();
                     Dictionary<Guid, Variables> taskVariablesMapping = new Dictionary<Guid, Variables>();

src/Agent.Worker/JobRunner.cs

@@ -177,7 +177,11 @@ public async Task<TaskResult> RunAsync(Pipelines.AgentJobRequestMessage message,
                 jobContext.SetVariable(Constants.Variables.Agent.RootDirectory, HostContext.GetDirectory(WellKnownDirectory.Work), isFilePath: true);
                 if (PlatformUtil.RunningOnWindows)
                 {
-                    jobContext.SetVariable(Constants.Variables.Agent.ServerOMDirectory, HostContext.GetDirectory(WellKnownDirectory.ServerOM), isFilePath: true);
+                    string serverOMDirectoryVariable = AgentKnobs.InstallLegacyTfExe.GetValue(jobContext).AsBoolean()
+                        ? HostContext.GetDirectory(WellKnownDirectory.ServerOMLegacy)
+                        : HostContext.GetDirectory(WellKnownDirectory.ServerOM);
+
+                    jobContext.SetVariable(Constants.Variables.Agent.ServerOMDirectory, serverOMDirectoryVariable, isFilePath: true);
                 }
                 if (!PlatformUtil.RunningOnWindows)
                 {

src/Agent.Worker/Release/ReleaseJobExtension.cs

@@ -229,6 +229,11 @@ private async Task DownloadArtifacts(IExecutionContext executionContext,
                 await teeUtil.DownloadTeeIfAbsent();
             }
 
+            if (AgentKnobs.InstallLegacyTfExe.GetValue(executionContext).AsBoolean())
+            {
+                await TfUtil.DownloadTfLegacyAsync(executionContext);
+            }
+
             try
             {
                 foreach (AgentArtifactDefinition agentArtifactDefinition in agentArtifactDefinitions)

src/Agent.Worker/TfManager.cs

@@ -0,0 +1,131 @@
+using Microsoft.VisualStudio.Services.Agent.Util;
+using System;
+using System.IO;
+using System.IO.Compression;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Microsoft.VisualStudio.Services.Agent.Worker
+{
+    public static class TfUtil
+    {
+        public static async Task DownloadTfLegacyAsync(IExecutionContext executionContext)
+        {
+            ArgUtil.NotNull(executionContext, nameof(executionContext));
+            string externalsPath = Path.Combine(executionContext.GetVariableValueOrDefault("Agent.HomeDirectory"), Constants.Path.ExternalsDirectory);
+            ArgUtil.NotNull(externalsPath, nameof(externalsPath));
+
+            string tfLegacyExternalsPath = Path.Combine(externalsPath, "tf-legacy");
+
+            if (!Directory.Exists(tfLegacyExternalsPath))
+            {
+                const string tfDownloadUrl = "https://vstsagenttools.blob.core.windows.net/tools/vstsom/m153_47c0856d/vstsom.zip";
+
+                string tempTfDirectory = Path.Combine(externalsPath, "tf_download_temp");
+                Directory.CreateDirectory(tempTfDirectory);
+                string downloadTfPath = Path.ChangeExtension(Path.Combine(tempTfDirectory, "tfdownload"), ".completed");
+
+                if (!File.Exists(downloadTfPath))
+                {
+                    await DownloadAsync(downloadTfPath, tfDownloadUrl, executionContext);
+                }
+                else
+                {
+                    executionContext.Debug($"tf is already downloaded to {downloadTfPath}.");
+                }
+
+                try
+                {
+                    ZipFile.ExtractToDirectory(downloadTfPath, tfLegacyExternalsPath);
+                    File.WriteAllText(downloadTfPath, DateTime.UtcNow.ToString());
+                    executionContext.Debug("tf-legacy has been extracted and cleaned up");
+                }
+                catch (Exception ex)
+                {
+                    executionContext.Error(ex);
+                }
+            }
+            else
+            {
+                executionContext.Debug($"tf-legacy download already exists at {tfLegacyExternalsPath}.");
+            }
+
+            string vstsomLegacyExternalsPath = Path.Combine(externalsPath, "vstsom-legacy");
+
+            if (!Directory.Exists(vstsomLegacyExternalsPath))
+            {
+                const string vstsomDownloadUrl = "https://vstsagenttools.blob.core.windows.net/tools/vstsom/m122_887c6659/vstsom.zip";
+
+                string tempVstsomDirectory = Path.Combine(externalsPath, "vstsom_download_temp");
+                Directory.CreateDirectory(tempVstsomDirectory);
+                string downloadVstsomPath = Path.ChangeExtension(Path.Combine(tempVstsomDirectory, "vstsomdownload"), ".completed");
+
+                if (!File.Exists(downloadVstsomPath))
+                {
+                    await DownloadAsync(downloadVstsomPath, vstsomDownloadUrl, executionContext);
+                }
+                else
+                {
+                    executionContext.Debug($"vstsom is already downloaded to {downloadVstsomPath}.");
+                }
+
+                try
+                {
+                    ZipFile.ExtractToDirectory(downloadVstsomPath, vstsomLegacyExternalsPath);
+                    File.WriteAllText(downloadVstsomPath, DateTime.UtcNow.ToString());
+                    executionContext.Debug("vstsom-legacy has been extracted and cleaned up");
+                }
+                catch (Exception ex)
+                {
+                    executionContext.Error(ex);
+                }
+            }
+            else
+            {
+                executionContext.Debug($"vstsom-legacy download already exists at {vstsomLegacyExternalsPath}.");
+            }
+        }
+
+        private static async Task DownloadAsync(string downloadPath, string blobUrl, IExecutionContext executionContext)
+        {
+            int retryCount = 0;
+            const int retryLimit = 3;
+            const int timeout = 180;
+            const int defaultFileStreamBufferSize = 4096;
+            const int retryDelay = 10000;
+
+            while (retryCount < retryLimit)
+            {
+                using CancellationTokenSource downloadCts = new(TimeSpan.FromSeconds(timeout));
+                using CancellationTokenSource linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(downloadCts.Token, executionContext.CancellationToken);
+                CancellationToken cancellationToken = linkedTokenSource.Token;
+
+                try
+                {
+                    using HttpClient httpClient = new();
+                    using Stream stream = await httpClient.GetStreamAsync(blobUrl, cancellationToken);
+                    using FileStream fs = new(downloadPath, FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: defaultFileStreamBufferSize, useAsync: true);
+
+                    await stream.CopyToAsync(fs, cancellationToken);
+                    executionContext.Debug("Finished downloading tool.");
+                    await fs.FlushAsync(cancellationToken);
+                    fs.Close();
+                    break;
+                }
+                catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+                {
+                    executionContext.Debug("Tool download has been cancelled.");
+                    throw;
+                }
+                catch (Exception)
+                {
+                    retryCount++;
+                    executionContext.Debug("Failed to download tool");
+                    executionContext.Debug("Retry tool download in 10 seconds.");
+                    await Task.Delay(retryDelay, cancellationToken);
+                }
+            }
+        }
+    }
+}

src/Microsoft.VisualStudio.Services.Agent/Constants.cs

@@ -22,6 +22,8 @@ public enum WellKnownDirectory
         Tools,
         Update,
         Work,
+        TfLegacy,
+        ServerOMLegacy
     }
 
     public enum WellKnownConfigFile
@@ -313,9 +315,11 @@ public static class Path
             public static readonly string ExternalsDirectory = "externals";
             public static readonly string LegacyPSHostDirectory = "vstshost";
             public static readonly string ServerOMDirectory = "vstsom";
+            public static readonly string ServerOMLegacyDirectory = "vstsom-legacy";
             public static readonly string TempDirectory = "_temp";
             public static readonly string TeeDirectory = "tee";
             public static readonly string TfDirectory = "tf";
+            public static readonly string TfLegacyDirectory = "tf-legacy";
             public static readonly string ToolDirectory = "_tool";
             public static readonly string TaskJsonFile = "task.json";
             public static readonly string TasksDirectory = "_tasks";

src/Microsoft.VisualStudio.Services.Agent/HostContext.cs

@@ -206,12 +206,24 @@ public virtual string GetDirectory(WellKnownDirectory directory)
                         Constants.Path.ServerOMDirectory);
                     break;
 
+                case WellKnownDirectory.ServerOMLegacy:
+                    path = Path.Combine(
+                        GetDirectory(WellKnownDirectory.Externals),
+                        Constants.Path.ServerOMLegacyDirectory);
+                    break;
+
                 case WellKnownDirectory.Tf:
                     path = Path.Combine(
                         GetDirectory(WellKnownDirectory.Externals),
                         Constants.Path.TfDirectory);
                     break;
 
+                case WellKnownDirectory.TfLegacy:
+                    path = Path.Combine(
+                        GetDirectory(WellKnownDirectory.Externals),
+                        Constants.Path.TfLegacyDirectory);
+                    break;
+
                 case WellKnownDirectory.Tee:
                     path = Path.Combine(
                         GetDirectory(WellKnownDirectory.Externals),

src/Misc/externals.sh

@@ -164,14 +164,14 @@ if [[ "$PACKAGERUNTIME" == "win-x"* ]]; then
 
         acquireExternalTool "$CONTAINER_URL/azcopy/1/azcopy.zip" azcopy
         acquireExternalTool "$CONTAINER_URL/vstshost/m122_887c6659/vstshost.zip" vstshost
-        acquireExternalTool "$CONTAINER_URL/vstsom/m122_887c6659/vstsom.zip" vstsom
+        acquireExternalTool "$CONTAINER_URL/vstsom/m153_47c0856d_adhoc/vstsom.zip" vstsom
     fi
 
     acquireExternalTool "$CONTAINER_URL/mingit/${MINGIT_VERSION}/MinGit-${MINGIT_VERSION}-${BIT}-bit.zip" git
     acquireExternalTool "$CONTAINER_URL/git-lfs/${LFS_VERSION}/x${BIT}/git-lfs.exe" "git/mingw${BIT}/bin"
     acquireExternalTool "$CONTAINER_URL/pdbstr/1/pdbstr.zip" pdbstr
     acquireExternalTool "$CONTAINER_URL/symstore/1/symstore.zip" symstore
-    acquireExternalTool "$CONTAINER_URL/vstsom/m153_47c0856d/vstsom.zip" tf
+    acquireExternalTool "$CONTAINER_URL/vstsom/m153_47c0856d_adhoc/vstsom.zip" tf
     acquireExternalTool "$CONTAINER_URL/vswhere/2_8_4/vswhere.zip" vswhere
     acquireExternalTool "https://dist.nuget.org/win-x86-commandline/v3.4.4/nuget.exe" nuget
 

src/Test/L0/TestHostContext.cs

@@ -217,6 +217,12 @@ public string GetDirectory(WellKnownDirectory directory)
                         Constants.Path.TfDirectory);
                     break;
 
+                case WellKnownDirectory.TfLegacy:
+                    path = Path.Combine(
+                        GetDirectory(WellKnownDirectory.Externals),
+                        Constants.Path.TfLegacyDirectory);
+                    break;
+
                 case WellKnownDirectory.Tee:
                     path = Path.Combine(
                         GetDirectory(WellKnownDirectory.Externals),