Revert "Allow running agent in debugging mode for specific node task (microsoft#4838)" (microsoft#4898)

This reverts commit 3f88445.

Author: kirill-ivlev

src/Agent.Listener/Agent.cs

@@ -216,13 +216,6 @@ public async Task<int> ExecuteCommand(CommandSettings command)
                 Trace.Info($"Set agent startup type - {startType}");
                 HostContext.StartupType = startType;
 
-                bool debugModeEnabled = command.GetDebugMode();
-                settings.DebugMode = debugModeEnabled;
-                store.SaveSettings(settings);
-                if (debugModeEnabled)
-                {
-                    Trace.Warning("Agent is running in debug mode, don't use it in production");
-                }
                 if (PlatformUtil.RunningOnWindows)
                 {
                     if (store.IsAutoLogonConfigured())

src/Agent.Listener/CommandLine/RunAgent.cs

@@ -18,8 +18,5 @@ public class RunAgent : BaseCommand
 
         [Option(Constants.Agent.CommandLine.Args.StartupType)]
         public string StartupType { get; set; }
-
-        [Option(Constants.Agent.CommandLine.Flags.DebugMode)]
-        public bool DebugMode { get; set; }
     }
 }

src/Agent.Listener/CommandSettings.cs

@@ -550,11 +550,6 @@ public bool GetRunOnce()
                    TestFlag(Run?.RunOnce, Constants.Agent.CommandLine.Flags.Once);
         }
 
-        public bool GetDebugMode()
-        {
-            return TestFlag(Run?.DebugMode, Constants.Agent.CommandLine.Flags.DebugMode);
-        }
-
         public bool GetDeploymentPool()
         {
             return TestFlag(Configure?.DeploymentPool, Constants.Agent.CommandLine.Flags.DeploymentPool);

src/Agent.Sdk/Knob/AgentKnobs.cs

@@ -213,12 +213,6 @@ public class AgentKnobs
             new EnvironmentKnobSource("VSTSAGENT_TRACE"),
             new BuiltInDefaultKnobSource(string.Empty));
 
-        public static readonly Knob DebugTask = new Knob(
-            nameof(DebugTask),
-            "If the agent executes a task which ID or name matches the value provided, it will run the task so that it will wait for debugger to attach",
-            new EnvironmentKnobSource("VSTSAGENT_DEBUG_TASK"),
-            new BuiltInDefaultKnobSource(string.Empty));
-
         public static readonly Knob DumpJobEventLogs = new Knob(
             nameof(DumpJobEventLogs),
             "If true, dump event viewer logs",

src/Agent.Worker/Handlers/NodeHandler.cs

@@ -224,21 +224,6 @@ public async Task RunAsync()
             var sigtermTimeout = TimeSpan.FromMilliseconds(AgentKnobs.ProccessSigtermTimeout.GetValue(ExecutionContext).AsInt());
             var useGracefulShutdown = AgentKnobs.UseGracefulProcessShutdown.GetValue(ExecutionContext).AsBoolean();
 
-            var configStore = HostContext.GetService<IConfigurationStore>();
-            var agentSettings = configStore.GetSettings();
-            if (agentSettings.DebugMode)
-            {
-                var debugTask = AgentKnobs.DebugTask.GetValue(ExecutionContext).AsString();
-                if (!string.IsNullOrEmpty(debugTask))
-                {
-                    if (string.Equals(Task?.Id.ToString("D"), debugTask, StringComparison.OrdinalIgnoreCase) || string.Equals(Task?.Name, debugTask, StringComparison.OrdinalIgnoreCase))
-                    {
-                        arguments = $"--inspect-brk {arguments}";
-                    }
-                }
-            }
-            
-
             try
             {
                 // Execute the process. Exit code 0 should always be returned.

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

@@ -132,9 +132,6 @@ public string Fingerprint
 
         [DataMember(EmitDefaultValue = false)]
         public int MaxDedupParallelism { get; set; }
-        
-        [DataMember(EmitDefaultValue = false)]
-        public bool DebugMode { get; set; }
     }
 
     [DataContract]

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

@@ -225,7 +225,6 @@ public static class Flags
                     public const string NoRestart = "norestart";
                     public const string LaunchBrowser = "launchbrowser";
                     public const string Once = "once";
-                    public const string DebugMode = "debug";
                     public const string RunAsAutoLogon = "runasautologon";
                     public const string RunAsService = "runasservice";
                     public const string PreventServiceStart = "preventservicestart";