Enable usage in AppContainers (PowerShell#27266)

SeeminglyScience · TravisEz13 · web-flow · commit 2475feb87698 · 2026-04-20T11:49:52.000-05:00
Co-authored-by: Travis Plunk &lt;travis.plunk@microsoft.com&gt;
diff --git a/src/System.Management.Automation/engine/Modules/ModuleIntrinsics.cs b/src/System.Management.Automation/engine/Modules/ModuleIntrinsics.cs
@@ -967,7 +967,9 @@ internal static string GetPersonalModulePath()
 #if UNIX
             return Platform.SelectProductNameForDirectory(Platform.XDG_Type.USER_MODULES);
 #else
-            string myDocumentsPath = InternalTestHooks.SetMyDocumentsSpecialFolderToBlank ? string.Empty : Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
+            string myDocumentsPath = InternalTestHooks.SetMyDocumentsSpecialFolderToBlank
+                ? string.Empty
+                : Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments, Environment.SpecialFolderOption.DoNotVerify);
             return string.IsNullOrEmpty(myDocumentsPath) ? null : Path.Combine(myDocumentsPath, Utils.ModuleDirectory);
 #endif
         }
diff --git a/src/System.Management.Automation/namespaces/FileSystemProvider.cs b/src/System.Management.Automation/namespaces/FileSystemProvider.cs
@@ -569,7 +569,7 @@ protected override PSDriveInfo NewDrive(PSDriveInfo drive)
             if (driveIsFixed)
             {
                 // Since the drive is fixed, ensure the root is valid.
-                validDrive = Directory.Exists(drive.Root);
+                validDrive = SafeDoesPathExist(drive.Root);
             }
 
             if (validDrive)
@@ -908,7 +908,7 @@ protected override Collection<PSDriveInfo> InitializeDefaultDrives()
 
                         if (newDrive.DriveType == DriveType.Fixed)
                         {
-                            if (!newDrive.RootDirectory.Exists)
+                            if (!SafeDoesPathExist(newDrive.RootDirectory.FullName))
                             {
                                 continue;
                             }
@@ -1227,6 +1227,29 @@ protected override void GetItem(string path)
             }
         }
 
+        private static bool SafeDoesPathExist(string rootDirectory)
+        {
+            if (Directory.Exists(rootDirectory))
+            {
+                return true;
+            }
+
+            try
+            {
+                return (File.GetAttributes(rootDirectory) & FileAttributes.Directory) is not 0;
+            }
+            // In some scenarios (like AppContainers) direct access to the root directory may
+            // be prevented, but more specific paths may be accessible.
+            catch (UnauthorizedAccessException)
+            {
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
         private FileSystemInfo GetFileSystemItem(string path, ref bool isContainer, bool showHidden)
         {
             path = NormalizePath(path);

Original file line number	Diff line number	Diff line change
`@@ -569,7 +569,7 @@ protected override PSDriveInfo NewDrive(PSDriveInfo drive)`
`569`	`569`	`if (driveIsFixed)`
`570`	`570`	`{`
`571`	`571`	`// Since the drive is fixed, ensure the root is valid.`
`572`		`- validDrive = Directory.Exists(drive.Root);`
	`572`	`+ validDrive = SafeDoesPathExist(drive.Root);`
`573`	`573`	`}`
`574`	`574`
`575`	`575`	`if (validDrive)`
`@@ -908,7 +908,7 @@ protected override Collection<PSDriveInfo> InitializeDefaultDrives()`
`908`	`908`
`909`	`909`	`if (newDrive.DriveType == DriveType.Fixed)`
`910`	`910`	`{`
`911`		`- if (!newDrive.RootDirectory.Exists)`
	`911`	`+ if (!SafeDoesPathExist(newDrive.RootDirectory.FullName))`
`912`	`912`	`{`
`913`	`913`	`continue;`
`914`	`914`	`}`
`@@ -1227,6 +1227,29 @@ protected override void GetItem(string path)`
`1227`	`1227`	`}`
`1228`	`1228`	`}`
`1229`	`1229`
	`1230`	`+ private static bool SafeDoesPathExist(string rootDirectory)`
	`1231`	`+ {`
	`1232`	`+ if (Directory.Exists(rootDirectory))`
	`1233`	`+ {`
	`1234`	`+ return true;`
	`1235`	`+ }`
	`1236`	`+`
	`1237`	`+ try`
	`1238`	`+ {`
	`1239`	`+ return (File.GetAttributes(rootDirectory) & FileAttributes.Directory) is not 0;`
	`1240`	`+ }`
	`1241`	`+ // In some scenarios (like AppContainers) direct access to the root directory may`
	`1242`	`+ // be prevented, but more specific paths may be accessible.`
	`1243`	`+ catch (UnauthorizedAccessException)`
	`1244`	`+ {`
	`1245`	`+ return true;`
	`1246`	`+ }`
	`1247`	`+ catch`
	`1248`	`+ {`
	`1249`	`+ return false;`
	`1250`	`+ }`
	`1251`	`+ }`
	`1252`	`+`
`1230`	`1253`	`private FileSystemInfo GetFileSystemItem(string path, ref bool isContainer, bool showHidden)`
`1231`	`1254`	`{`
`1232`	`1255`	`path = NormalizePath(path);`