[sxs] Add support for the undocumented loadFrom keyword

DependenciesLib/SxsManifest.cs

@@ -42,6 +42,31 @@ public SxsEntry(XElement SxsAssemblyIdentity, XElement SxsFile, string Folder)
             Type = "";
             PublicKeyToken = "";
 
+            string loadFrom = SxsFile.Attribute("loadFrom")?.Value?.ToString();
+            if (!string.IsNullOrEmpty(loadFrom))
+            {
+                loadFrom = Environment.ExpandEnvironmentVariables(loadFrom);
+                if (!System.IO.Path.IsPathRooted(loadFrom))
+                {
+                    loadFrom = System.IO.Path.Combine(Folder, loadFrom);
+                }
+
+                // It's only a folder
+                if (loadFrom.EndsWith("\\") || loadFrom.EndsWith("/"))
+                {
+                    Path = System.IO.Path.Combine(loadFrom, RelPath);
+                }
+                else
+                {
+                    // It's also a dll name!
+                    Path = loadFrom;
+                    if (!Path.ToLower().EndsWith(".dll"))
+                    {
+                        Path += ".DLL";
+                    }
+                }
+            }
+
             if (SxsAssemblyIdentity != null)
             {
                 if (SxsAssemblyIdentity.Attribute("version") != null)

test/manifest-regress/Test-ManifestRegress.ps1

@@ -53,7 +53,7 @@ function Test-Executable {
     }
     else 
     {
-        Write-Host -ForegroundColor Green "[+] $TestName test passed";    
+        Write-Host -ForegroundColor Green "[+] $TestName test passed";
     }
 
     Write-Output ""
@@ -72,4 +72,16 @@ Test-Executable -TestName "SystemSettings" -TestExecutable $SystemSettingsPath -
 
 # Double quotes in assemblyIdentity name attribute !
 $DevicePairingFolderPath = Join-Path $RegressDir "DevicePairingFolder.dll";
-Test-Executable -TestName "DevicePairingFolder" -TestExecutable $DevicePairingFolderPath -Command "-manifest" -StringToFound '<assemblyIdentity name="Microsoft.Windows.Shell.DevicePairingFolder" processorArchitecture="amd64"' -BinFolder $DependenciesDir
+Test-Executable -TestName "DevicePairingFolder" -TestExecutable $DevicePairingFolderPath -Command "-manifest" -StringToFound '<assemblyIdentity name="Microsoft.Windows.Shell.DevicePairingFolder" processorArchitecture="amd64"' -BinFolder $DependenciesDir
+
+# Redirect dll loading to a directory, so search for this directory name in the sxs dependencies
+$UseDll32Path = Join-Path $RegressDir "use_dll32.exe";
+Test-Executable -TestName "DllRedirection32" -TestExecutable $UseDll32Path -Command "-sxsentries" -StringToFound '\test_folder\depdll32.dll' -BinFolder $DependenciesDir
+
+# Redirect the dll to a directory, but also change the dll name!
+$UseDll64Path = Join-Path $RegressDir "use_dll64.exe";
+Test-Executable -TestName "DllRedirection64CustomName" -TestExecutable $UseDll64Path -Command "-sxsentries" -StringToFound '\test_folder\custom_name64.DLL' -BinFolder $DependenciesDir
+
+# Re-run the previous test, but ensure dependencies also knows the original dll name!
+$UseDll64Path = Join-Path $RegressDir "use_dll64.exe";
+Test-Executable -TestName "DllRedirection64RealName" -TestExecutable $UseDll64Path -Command "-sxsentries" -StringToFound 'depdll64.dll' -BinFolder $DependenciesDir

test/manifest-regress/use_dll32.exe.manifest

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+<assemblyIdentity type="win32" name="use_dll" version="0.0.0.0"/>
+
+<file name="depdll32.dll" loadFrom="test_folder\" />
+
+</assembly>
+

test/manifest-regress/use_dll64.exe.manifest

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+<assemblyIdentity type="win32" name="use_dll" version="0.0.0.0"/>
+
+<file name="depdll64.dll" loadFrom="test_folder/custom_name64" />
+
+</assembly>
+