Set ManagedDependenciesPath for both AppService and Linux Consumption environments (#633)

* Set the Managed Dependencies path when running in Azure App Service or Linux Consumption.

* Add unit test to validate setting the ManagedDependenciesPath.

Author: Francisco-Gamino

src/DependencyManagement/ManagedDependenciesPathDetector.cs

@@ -12,6 +12,8 @@ internal static class ManagedDependenciesPathDetector
     {
         // Environment variables to help figure out if we are running in Azure.
         private const string AzureWebsiteInstanceId = "WEBSITE_INSTANCE_ID";
+        private const string ContainerName = "CONTAINER_NAME";
+
         private const string HomeDriveName = "HOME";
         private const string DataFolderName = "data";
 
@@ -28,8 +30,8 @@ internal static class ManagedDependenciesPathDetector
         /// </summary>
         public static string GetManagedDependenciesPath(string functionAppRootPath)
         {
-            // If we are running in Azure use the 'HOME\Data' path.
-            if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable(AzureWebsiteInstanceId)))
+            // If we are running in Azure App Service or Linux Consumption use the 'HOME\data' path.
+            if (IsAppService() || IsLinuxConsumption())
             {
                 var homeDriveVariable = Environment.GetEnvironmentVariable(HomeDriveName);
                 if (string.IsNullOrEmpty(homeDriveVariable))
@@ -46,5 +48,15 @@ public static string GetManagedDependenciesPath(string functionAppRootPath)
             string appDataFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData, Environment.SpecialFolderOption.DoNotVerify);
             return Path.Combine(appDataFolder, AzureFunctionsFolderName, functionAppName, ManagedDependenciesFolderName);
         }
+
+        private static bool IsAppService()
+        {
+            return !string.IsNullOrEmpty(Environment.GetEnvironmentVariable(AzureWebsiteInstanceId));
+        }
+
+        private static bool IsLinuxConsumption()
+        {
+            return !IsAppService() && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable(ContainerName));
+        }
     }
 }

test/Unit/DependencyManagement/ManagedDependenciesPathDetectorTests.cs

@@ -0,0 +1,66 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.Azure.Functions.PowerShellWorker.Test.DependencyManagement
+{
+    using System;
+    using System.IO;
+    using Xunit;
+    using Microsoft.Azure.Functions.PowerShellWorker.DependencyManagement;
+
+    public class ManagedDependenciesPathDetectorTests
+    {
+        [Theory]
+        [InlineData("CONTAINER_NAME", "MyContainerName", true)]
+        [InlineData("WEBSITE_INSTANCE_ID", "MyInstanceId", true)]
+        [InlineData(null, null, false)]
+        public void ValidateManagedDependenciesPath(string name, string value, bool setEnvironmentVariable)
+        {
+            const string HomeDriveName = "HOME";
+            const string FunctionName = "MyFunction";
+
+            string expectedPath = null;
+
+            if (setEnvironmentVariable)
+            {
+                Environment.SetEnvironmentVariable(name, value);
+                Environment.SetEnvironmentVariable(HomeDriveName, "home");
+
+                const string DataFolderName = "data";
+                const string ManagedDependenciesFolderName = "ManagedDependencies";
+                expectedPath = Path.Combine(HomeDriveName, DataFolderName, ManagedDependenciesFolderName);
+            }
+            else
+            {
+                const string ManagedDependenciesFolderName = "ManagedDependencies";
+                const string AzureFunctionsFolderName = "AzureFunctions";
+                string appDataFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData, Environment.SpecialFolderOption.DoNotVerify);
+                expectedPath = Path.Combine(appDataFolder, AzureFunctionsFolderName, FunctionName, ManagedDependenciesFolderName);
+            }
+
+            var functionAppRoot = Path.Join(Path.GetTempPath(), FunctionName);
+
+            try
+            {
+                var managedDependenciesPath = ManagedDependenciesPathDetector.GetManagedDependenciesPath(functionAppRoot);
+                var dependenciesPathIsValid = managedDependenciesPath.StartsWith(expectedPath, StringComparison.CurrentCultureIgnoreCase);
+                Assert.True(dependenciesPathIsValid);
+            }
+            finally
+            {
+                if (setEnvironmentVariable)
+                {
+                    Environment.SetEnvironmentVariable(name, null);
+                    Environment.SetEnvironmentVariable(HomeDriveName, null);
+                }
+
+                if (Directory.Exists(functionAppRoot))
+                {
+                    Directory.Delete(functionAppRoot);
+                }
+            }
+        }
+    }
+}