Users/nmalkapuram/user name detection logic (#252)

* Adding username detection logic

* create package directory if it doesn't exists for wgetInstallationDependency

* updating unit tests and resolving comments

* removing unused library reference

* fixinf scenario name in redis profile

* username changes

* Adding username detection logic

* updating unit tests and resolving comments

* removing unused library reference

* removing comments

* resolving comments

* resolving comments

---------

Co-authored-by: Yang Pan <31965446+yangpanMS@users.noreply.github.com>

src/VirtualClient/VirtualClient.Actions.FunctionalTests/Memcached/MemcachedServerProfileTests.cs

@@ -10,6 +10,7 @@ namespace VirtualClient.Actions
     using System.Runtime.InteropServices;
     using System.Threading;
     using System.Threading.Tasks;
+    using Moq;
     using NUnit.Framework;
     using VirtualClient.Actions.Memtier;
     using VirtualClient.Common;
@@ -62,9 +63,12 @@ await executor.ExecuteAsync(ProfileTiming.OneIteration(), CancellationToken.None
         [TestCase("PERF-MEMCACHED.json")]
         public async Task MemcachedMemtierWorkloadProfileExecutesTheWorkloadAsExpectedOfServerOnUnixPlatformMultiVM(string profile)
         {
+            this.mockFixture.SystemManagement.Setup(mgr => mgr.GetLoggedInUserName())
+                            .Returns("mockuser");
+
             IEnumerable<string> expectedCommands = new List<string>
             {
-                $"sudo -u {Environment.UserName} bash -c \"numactl -C {string.Join(",", Enumerable.Range(0, Environment.ProcessorCount))} /.+/memcached -p 6379 -t 4 -m 30720 -c 16384\""
+                $"sudo -u mockuser bash -c \"numactl -C {string.Join(",", Enumerable.Range(0, Environment.ProcessorCount))} /.+/memcached -p 6379 -t 4 -m 30720 -c 16384\""
             };
 
             // Setup the expectations for the workload

src/VirtualClient/VirtualClient.Actions/Memcached/MemcachedExecutor.cs

@@ -59,7 +59,7 @@ public string Username
                 string username = this.Parameters.GetValue<string>(nameof(MemcachedExecutor.Username), string.Empty);
                 if (string.IsNullOrWhiteSpace(username))
                 {
-                    username = Environment.UserName;
+                    username = this.SystemManagement.GetLoggedInUserName();
                 }
 
                 return username;

src/VirtualClient/VirtualClient.Actions/Memtier/MemtierBenchmarkClientExecutor.cs

@@ -383,7 +383,7 @@ private void CaptureMetrics(EventContext telemetryContext, CancellationToken can
                             {
                                 this.Logger.LogMetrics(
                                     $"Memtier-{this.Benchmark}",
-                                    this.Scenario,
+                                    this.MetricScenario ?? this.Scenario,
                                     processInfo.StartTime,
                                     processInfo.EndTime,
                                     metric.Name,
@@ -409,7 +409,7 @@ private void CaptureMetrics(EventContext telemetryContext, CancellationToken can
                         {
                             this.Logger.LogMetrics(
                                 $"Memtier-{this.Benchmark}",
-                                this.Scenario,
+                                this.MetricScenario ?? this.Scenario,
                                 processReference.StartTime,
                                 processReference.EndTime,
                                 metric.Name,

src/VirtualClient/VirtualClient.Contracts/ISystemInfo.cs

@@ -57,6 +57,12 @@ public interface ISystemInfo
         /// <returns>True/False is an IP is defined on current system.</returns>
         bool IsLocalIPAddress(string ipAddress);
 
+        /// <summary>
+        /// Get the logged In Username i.e, username of the user who invoked a command with elevated privileges using the "sudo" command in Unix operating system.
+        /// </summary>
+        /// <returns>Username of the logged In user</returns>
+        string GetLoggedInUserName();
+
         /// <summary>
         /// Returns information about the CPU on the system.
         /// </summary>

src/VirtualClient/VirtualClient.Core/SystemManagement.cs

@@ -126,6 +126,30 @@ public async Task<CpuInfo> GetCpuInfoAsync(CancellationToken cancellationToken)
             return info;
         }
 
+        /// <summary>
+        /// Get the logged In Username i.e, username of the user who invoked a command with elevated privileges using the "sudo" command in Unix operating system.
+        /// </summary>
+        public string GetLoggedInUserName()
+        {
+            string loggedInUserName = Environment.UserName;
+            if (string.Equals(loggedInUserName, "root"))
+            {
+                loggedInUserName = Environment.GetEnvironmentVariable("SUDO_USER");
+                if (string.Equals(loggedInUserName, "root") || string.IsNullOrEmpty(loggedInUserName))
+                {
+                    loggedInUserName = Environment.GetEnvironmentVariable("VC_SUDO_USER");
+                    if (string.IsNullOrEmpty(loggedInUserName))
+                    {
+                        throw new EnvironmentSetupException($"'USER' Environment variable is set to root and 'SUDO_USER' Environment variable is either root or null." +
+                            "The required environment variable 'VC_SUDO_USER' is expected to be set to a valid non-empty value." +
+                            "Please ensure that the necessary environment variables are configured properly for the execution environment.", ErrorReason.EnvironmentIsInsufficent);
+                    }
+                }
+            }
+
+            return loggedInUserName;
+        }
+
         /// <summary>
         /// Returns information about the specific Linux distribution (e.g. Ubuntu, CentOS).
         /// </summary>

src/VirtualClient/VirtualClient.Dependencies/Packaging/WgetPackageInstallation.cs

@@ -122,6 +122,12 @@ protected override async Task ExecuteAsync(EventContext telemetryContext, Cancel
                         string installationPath = downloadedPackagePath;
                         string packagesDirectory = this.GetPackagePath();
 
+                        // Create packages directory if not present.
+                        if (!this.fileSystem.Directory.Exists(packagesDirectory))
+                        {
+                            this.fileSystem.Directory.CreateDirectory(packagesDirectory);
+                        }
+
                         // Cleanup the file if it exists.
                         if (this.fileSystem.File.Exists(downloadedPackagePath))
                         {