PowerShell · adityapatwardhan · Oct 19, 2017 · Oct 12, 2017 · Oct 13, 2017 · Oct 15, 2017
diff --git a/src/System.Management.Automation/engine/Modules/ModuleCmdletBase.cs b/src/System.Management.Automation/engine/Modules/ModuleCmdletBase.cs
@@ -293,34 +293,42 @@ internal bool LoadUsingModulePath(PSModuleInfo parentModule, bool found, IEnumer
             // Now search using the module path...
             foreach (string path in modulePath)
             {
-                // a name takes the form of .../moduleDir/moduleName.<ext>
-                // if only one name has been specified, then the moduleDir
-                // and moduleName are identical and repeated...
-                // Also append th ename if the path currently points at a directory
-                string qualifiedPath = Path.Combine(path, fileBaseName);
-
-                // Load the latest valid version if it is a multi-version module directory
-                module = LoadUsingMultiVersionModuleBase(qualifiedPath, manifestProcessingFlags, options, out found);
-
-                if (!found)
+#if UNIX
+                foreach (string folder in Directory.EnumerateDirectories(path))
                 {
-                    if (name.IndexOfAny(Utils.Separators.Directory) == -1)
+                    string moduleName = Path.GetFileName(folder);
+                    if (String.Compare(moduleName, fileBaseName, StringComparison.OrdinalIgnoreCase) == 0)
                     {
-                        qualifiedPath = Path.Combine(qualifiedPath, fileBaseName);
+                        fileBaseName = moduleName;
+#endif
+                        string qualifiedPath = Path.Combine(path, fileBaseName);
+                        module = LoadUsingMultiVersionModuleBase(qualifiedPath, manifestProcessingFlags, options, out found);
+                        if (!found)
+                        {
+                            if (name.IndexOfAny(Utils.Separators.Directory) == -1)
+                            {
+                                qualifiedPath = Path.Combine(qualifiedPath, fileBaseName);
+                            }
+                            else if (Utils.NativeDirectoryExists(qualifiedPath))
+                            {
+                                // if it points to a directory, add the basename back onto the path...
+                                qualifiedPath = Path.Combine(qualifiedPath, Path.GetFileName(fileBaseName));
+                            }
+
+                            module = LoadUsingExtensions(parentModule, name, qualifiedPath, extension, null, this.BasePrefix, ss, options, manifestProcessingFlags, out found);
+                        }
+#if UNIX
                     }
-                    else if (Directory.Exists(qualifiedPath))
+                    if (found)
                     {
-                        // if it points to a directory, add the basename back onto the path...
-                        qualifiedPath = Path.Combine(qualifiedPath, Path.GetFileName(fileBaseName));
+                        break;
                     }
-
-                    module = LoadUsingExtensions(parentModule, name, qualifiedPath, extension, null, this.BasePrefix, ss, options, manifestProcessingFlags, out found);
                 }
-
                 if (found)
                 {
                     break;
                 }
+#endif
             }
 
             if (found)

diff --git a/test/powershell/Modules/Microsoft.PowerShell.Core/Import-Module.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Core/Import-Module.Tests.ps1
@@ -103,7 +103,7 @@ using System.Management.Automation;           // Windows PowerShell namespace.
 
 namespace ModuleCmdlets
 {
-  [Cmdlet(VerbsDiagnostic.Test,"BinaryModuleCmdlet1")]   
+  [Cmdlet(VerbsDiagnostic.Test,"BinaryModuleCmdlet1")]
   public class TestBinaryModuleCmdlet1Command : Cmdlet
   {
     protected override void BeginProcessing()
@@ -124,3 +124,41 @@ namespace ModuleCmdlets
     }
  }
 
+Describe "Import-Module should be case insensitive" -Tags 'CI' {
+    BeforeAll {
+        $defaultPSModuleAutoloadingPreference = $PSModuleAutoloadingPreference
+        $originalPSModulePath = $env:PSModulePath.Clone()
+        $modulesPath = "$TestDrive\Modules"
+        $env:PSModulePath += [System.IO.Path]::PathSeparator + $modulesPath
+        $PSModuleAutoloadingPreference = "none"
+    }
+
+    AfterAll {
+        $global:PSModuleAutoloadingPreference = $defaultPSModuleAutoloadingPreference
+        $env:PSModulePath = $originalPSModulePath
+    }
+
+    AfterEach {
+        Remove-Item -Recurse -Path $modulesPath -Force -ErrorAction SilentlyContinue
+    }
+
+    It "Import-Module can import a module using different casing using '<modulePath>' and manifest:<manifest>" -TestCases @(
+        @{modulePath="TESTMODULE/1.1"; manifest=$true},
+        @{modulePath="TESTMODULE"    ; manifest=$true},
+        @{modulePath="TESTMODULE"    ; manifest=$false}
+        ) {
+        param ($modulePath, $manifest)
+        New-Item -ItemType Directory -Path "$modulesPath/$modulePath" -Force > $null
+        if ($manifest) {
+            New-ModuleManifest -Path "$modulesPath/$modulePath/TESTMODULE.psd1" -RootModule "TESTMODULE.psm1" -ModuleVersion 1.1
+        }
+        Set-Content -Path "$modulesPath/$modulePath/TESTMODULE.psm1" -Value "function mytest { 'hello' }"
+        Import-Module testMODULE
+        $m = Get-Module TESTmodule
+        $m | Should BeOfType "System.Management.Automation.PSModuleInfo"
+        $m.Name | Should Be "TESTMODULE"
+        mytest | Should BeExactly "hello"
+        Remove-Module TestModule
+        Get-Module tESTmODULE | Should BeNullOrEmpty
+    }
+}