[feature] experimental feature for temp drive

src/System.Management.Automation/engine/DriveNames.cs

@@ -28,5 +28,10 @@ internal static class DriveNames
         /// The default FunctionProvider drive name.
         /// </summary>
         internal const string FunctionDrive = "Function";
+
+        /// <summary>
+        /// The Temp drive name.
+        /// </summary>
+        internal const string TempDrive = "Temp";
     }
 }

src/System.Management.Automation/engine/ExperimentalFeature/ExperimentalFeature.cs

@@ -83,19 +83,27 @@ static ExperimentalFeature()
             // Initialize the readonly collection 'EngineExperimentalFeatures'.
             var engineFeatures = new ExperimentalFeature[] {
                 /* Register engine experimental features here. Follow the same pattern as the example:
-                new ExperimentalFeature(name: "PSFileSystemProviderV2",
-                                        description: "Replace the old FileSystemProvider with cleaner design and faster code",
-                                        source: EngineSource,
-                                        isEnabled: false),
+                new ExperimentalFeature(
+                    name: "PSFileSystemProviderV2",
+                    description: "Replace the old FileSystemProvider with cleaner design and faster code",
+                    source: EngineSource,
+                    isEnabled: false),
                 */
-                new ExperimentalFeature(name: "PSImplicitRemotingBatching",
-                                        description: "Batch implicit remoting proxy commands to improve performance",
-                                        source: EngineSource,
-                                        isEnabled: false),
-                new ExperimentalFeature(name: "PSUseAbbreviationExpansion",
-                                        description: "Allow tab completion of cmdlets and functions by abbreviation",
-                                        source: EngineSource,
-                                        isEnabled: false),
+                new ExperimentalFeature(
+                    name: "PSImplicitRemotingBatching",
+                    description: "Batch implicit remoting proxy commands to improve performance",
+                    source: EngineSource,
+                    isEnabled: false),
+                new ExperimentalFeature(
+                    name: "PSUseAbbreviationExpansion",
+                    description: "Allow tab completion of cmdlets and functions by abbreviation",
+                    source: EngineSource,
+                    isEnabled: false),
+                new ExperimentalFeature(
+                    name: "PSTempDrive",
+                    description: "Create TEMP: PS Drive mapped to user's temporary directory path",
+                    source: EngineSource,
+                    isEnabled: false),
             };
             EngineExperimentalFeatures = new ReadOnlyCollection<ExperimentalFeature>(engineFeatures);
 

src/System.Management.Automation/namespaces/FileSystemProvider.cs

@@ -1000,6 +1000,19 @@ protected override Collection<PSDriveInfo> InitializeDefaultDrives()
                 }
             }
 
+            if (ExperimentalFeature.IsEnabled("PSTempDrive"))
+            {
+                PSDriveInfo newPSDriveInfo =
+                    new PSDriveInfo(
+                        DriveNames.TempDrive,
+                        ProviderInfo,
+                        Path.GetTempPath(),
+                        SessionStateStrings.TempDriveDescription,
+                        credential: null,
+                        displayRoot: null);
+                results.Add(newPSDriveInfo);
+            }
+
             return results;
         }
 

src/System.Management.Automation/resources/SessionStateStrings.resx

@@ -624,6 +624,9 @@
   <data name="VariableDriveDescription" xml:space="preserve">
     <value>Drive that contains a view of those variables stored in a session state</value>
   </data>
+  <data name="TempDriveDescription" xml:space="preserve">
+    <value>Drive that maps to the temporary directory path for the current user</value>
+  </data>
   <data name="ProviderProviderPathFormatException" xml:space="preserve">
     <value>The path is not in the correct format. Paths can contain only provider and drive names separated by slashes or backslashes.</value>
   </data>

test/powershell/Modules/Microsoft.PowerShell.Management/Get-PSDrive.Tests.ps1

@@ -57,3 +57,27 @@ Describe "Get-PSDrive" -Tags "CI" {
         $dInfo.Used -ge 0 | Should -BeTrue
     }
 }
+
+Describe "Experimental Feature Temp: drive" -Tag Feature {
+    BeforeAll {
+        $configFilePath = Join-Path $testdrive "experimentalfeature.json"
+
+        @"
+        {
+            "ExperimentalFeatures": [
+              "PSTempDrive"
+            ]
+        }
+"@ > $configFilePath
+    }
+
+    It "TEMP: drive exists if experimental feature is enabled" {
+        $res = pwsh -outputformat xml -settingsfile $configFilePath -command "Get-PSDrive Temp"
+        $res.Name | Should -BeExactly "Temp"
+        $res.Root | Should -BeExactly ([System.IO.Path]::GetTempPath())
+    }
+
+    It "TEMP: drive does not exist if experimental feature is not enabled" {
+        { Get-PSDrive Temp -ErrorAction Stop } | Should -Throw -ErrorId "GetLocationNoMatchingDrive,Microsoft.PowerShell.Commands.GetPSDriveCommand"
+    }
+}