Move Dependency.wixext into ext

7 files changed, 683 insertions, 0 deletions

diff --git a/src/ext/Dependency/ca/custommsierrors.h b/src/ext/Dependency/ca/custommsierrors.h
new file mode 100644
index 00000000..26450452
--- /dev/null
+++ b/src/ext/Dependency/ca/custommsierrors.h
@@ -0,0 +1,5 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#define msierrDependencyMissingDependencies    26451
+#define msierrDependencyHasDependents          26452
diff --git a/src/ext/Dependency/ca/dependencyca.vcxproj b/src/ext/Dependency/ca/dependencyca.vcxproj
new file mode 100644
index 00000000..2a0760d6
--- /dev/null
+++ b/src/ext/Dependency/ca/dependencyca.vcxproj
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{B86AF46C-0F90-49CC-923F-A800B088D015}</ProjectGuid>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <TargetName>dependencyca</TargetName>
+    <ProjectModuleDefinitionFile>wixdepca.def</ProjectModuleDefinitionFile>
+    <Description>WiX Toolset Dependency CustomAction</Description>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+
+  <PropertyGroup>
+    <ProjectAdditionalLinkLibraries>msi.lib</ProjectAdditionalLinkLibraries>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+    <ClCompile Include="wixdepca.cpp" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="wixdepca.def" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="WixToolset.Dutil" Version="4.0.72" />
+    <PackageReference Include="WixToolset.WcaUtil" Version="4.0.19" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.3.37" />
+  </ItemGroup>
+
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+</Project>
diff --git a/src/ext/Dependency/ca/dependencyca.vcxproj.filters b/src/ext/Dependency/ca/dependencyca.vcxproj.filters
new file mode 100644
index 00000000..bfe457e2
--- /dev/null
+++ b/src/ext/Dependency/ca/dependencyca.vcxproj.filters
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="wixdepca.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="dllmain.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="wixdepca.def">
+      <Filter>Source Files</Filter>
+    </None>
+    <None Include="packages.config" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/src/ext/Dependency/ca/dllmain.cpp b/src/ext/Dependency/ca/dllmain.cpp
new file mode 100644
index 00000000..7d299feb
--- /dev/null
+++ b/src/ext/Dependency/ca/dllmain.cpp
@@ -0,0 +1,27 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+/********************************************************************
+DllMain - standard entry point for all WiX custom actions.
+
+********************************************************************/
+extern "C" BOOL WINAPI DllMain(
+    IN HINSTANCE hInstance,
+    IN ULONG ulReason,
+    IN LPVOID)
+{
+    switch(ulReason)
+    {
+    case DLL_PROCESS_ATTACH:
+        WcaGlobalInitialize(hInstance);
+        ::DisableThreadLibraryCalls(hInstance);
+        break;
+
+    case DLL_PROCESS_DETACH:
+        WcaGlobalFinalize();
+        break;
+    }
+
+    return TRUE;
+}
diff --git a/src/ext/Dependency/ca/precomp.h b/src/ext/Dependency/ca/precomp.h
new file mode 100644
index 00000000..5fd06cff
--- /dev/null
+++ b/src/ext/Dependency/ca/precomp.h
@@ -0,0 +1,18 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+
+#include <windows.h>
+#include <msiquery.h>
+#include <intsafe.h>
+#include <strsafe.h>
+
+#include "wcautil.h"
+#include "fileutil.h"
+#include "strutil.h"
+#include "memutil.h"
+#include "regutil.h"
+#include "dictutil.h"
+#include "deputil.h"
+
+#include "CustomMsiErrors.h"
diff --git a/src/ext/Dependency/ca/wixdepca.cpp b/src/ext/Dependency/ca/wixdepca.cpp
new file mode 100644
index 00000000..d6433707
--- /dev/null
+++ b/src/ext/Dependency/ca/wixdepca.cpp
@@ -0,0 +1,516 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+#define IDNOACTION 0
+#define INITIAL_STRINGDICT_SIZE 4
+
+LPCWSTR vcsDependencyProviderQuery =
+    L"SELECT `WixDependencyProvider`.`WixDependencyProvider`, `WixDependencyProvider`.`Component_`, `WixDependencyProvider`.`ProviderKey`, `WixDependencyProvider`.`Attributes` "
+    L"FROM `WixDependencyProvider`";
+enum eDependencyProviderQuery { dpqId = 1, dpqComponent, dpqProviderKey, dpqAttributes };
+
+LPCWSTR vcsDependencyQuery =
+    L"SELECT `WixDependency`.`WixDependency`, `WixDependencyProvider`.`Component_`, `WixDependency`.`ProviderKey`, `WixDependency`.`MinVersion`, `WixDependency`.`MaxVersion`, `WixDependency`.`Attributes` "
+    L"FROM `WixDependencyProvider`, `WixDependency`, `WixDependencyRef` "
+    L"WHERE `WixDependency`.`WixDependency` = `WixDependencyRef`.`WixDependency_` AND `WixDependencyProvider`.`WixDependencyProvider` = `WixDependencyRef`.`WixDependencyProvider_`";
+enum eDependencyComponentQuery { dqId = 1, dqComponent, dqProviderKey, dqMinVersion, dqMaxVersion, dqAttributes };
+
+static HRESULT EnsureRequiredDependencies(
+    __in MSIHANDLE hInstall,
+    __in BOOL fMachineContext
+    );
+
+static HRESULT EnsureAbsentDependents(
+    __in MSIHANDLE hInstall,
+    __in BOOL fMachineContext
+    );
+
+static HRESULT SplitIgnoredDependents(
+    __deref_inout STRINGDICT_HANDLE* psdIgnoredDependents
+    );
+
+static HRESULT CreateDependencyRecord(
+    __in int iMessageId,
+    __in_ecount(cDependencies) const DEPENDENCY* rgDependencies,
+    __in UINT cDependencies,
+    __out MSIHANDLE *phRecord
+    );
+
+static LPCWSTR LogDependencyName(
+    __in_z LPCWSTR wzName
+    );
+
+/***************************************************************************
+ WixDependencyRequire - Checks that all required dependencies are installed.
+
+***************************************************************************/
+extern "C" UINT __stdcall WixDependencyRequire(
+    __in MSIHANDLE hInstall
+    )
+{
+    HRESULT hr = S_OK;
+    UINT er = ERROR_SUCCESS;
+    BOOL fMachineContext = FALSE;
+
+    hr = WcaInitialize(hInstall, "WixDependencyRequire");
+    ExitOnFailure(hr, "Failed to initialize.");
+
+    hr = RegInitialize();
+    ExitOnFailure(hr, "Failed to initialize the registry functions.");
+
+    // Determine whether we're installing per-user or per-machine.
+    fMachineContext = WcaIsPropertySet("ALLUSERS");
+
+    // Check for any provider components being (re)installed that their requirements are already installed.
+    hr = EnsureRequiredDependencies(hInstall, fMachineContext);
+    ExitOnFailure(hr, "Failed to ensure required dependencies for (re)installing components.");
+
+LExit:
+    RegUninitialize();
+
+    er = FAILED(hr) ? ERROR_INSTALL_FAILURE : ERROR_SUCCESS;
+    return WcaFinalize(er);
+}
+
+/***************************************************************************
+ WixDependencyCheck - Check dependencies based on component state.
+
+ Note: may return ERROR_NO_MORE_ITEMS to terminate the session early.
+***************************************************************************/
+extern "C" UINT __stdcall WixDependencyCheck(
+    __in MSIHANDLE hInstall
+    )
+{
+    HRESULT hr = S_OK;
+    UINT er = ERROR_SUCCESS;
+    BOOL fMachineContext = FALSE;
+
+    hr = WcaInitialize(hInstall, "WixDependencyCheck");
+    ExitOnFailure(hr, "Failed to initialize.");
+
+    hr = RegInitialize();
+    ExitOnFailure(hr, "Failed to initialize the registry functions.");
+
+    // Determine whether we're installing per-user or per-machine.
+    fMachineContext = WcaIsPropertySet("ALLUSERS");
+
+    // Check for any dependents of provider components being uninstalled.
+    hr = EnsureAbsentDependents(hInstall, fMachineContext);
+    ExitOnFailure(hr, "Failed to ensure absent dependents for uninstalling components.");
+
+LExit:
+    RegUninitialize();
+
+    er = FAILED(hr) ? ERROR_INSTALL_FAILURE : ERROR_SUCCESS;
+    return WcaFinalize(er);
+}
+
+/***************************************************************************
+ EnsureRequiredDependencies - Check that dependencies are installed for
+  any provider component that is being installed or reinstalled.
+
+ Note: Skipped if DISABLEDEPENDENCYCHECK is set.
+***************************************************************************/
+static HRESULT EnsureRequiredDependencies(
+    __in MSIHANDLE /*hInstall*/,
+    __in BOOL fMachineContext
+    )
+{
+    HRESULT hr = S_OK;
+    DWORD er = ERROR_SUCCESS;
+    STRINGDICT_HANDLE sdDependencies = NULL;
+    HKEY hkHive = NULL;
+    PMSIHANDLE hView = NULL;
+    PMSIHANDLE hRec = NULL;
+    LPWSTR sczId = NULL;
+    LPWSTR sczComponent = NULL;
+    LPWSTR sczProviderKey = NULL;
+    LPWSTR sczMinVersion = NULL;
+    LPWSTR sczMaxVersion = NULL;
+    int iAttributes = 0;
+    WCA_TODO tComponentAction = WCA_TODO_UNKNOWN;
+    DEPENDENCY* rgDependencies = NULL;
+    UINT cDependencies = 0;
+    PMSIHANDLE hDependencyRec = NULL;
+
+    // Skip the dependency check if the WixDependency table is missing (no dependencies to check for).
+    hr = WcaTableExists(L"WixDependency");
+    if (S_FALSE == hr)
+    {
+        WcaLog(LOGMSG_STANDARD, "Skipping the dependency check since no dependencies are authored.");
+        ExitFunction1(hr = S_OK);
+    }
+
+    // If the table exists but not the others, the database was not authored correctly.
+    ExitOnFailure(hr, "Failed to check if the WixDependency table exists.");
+
+    // Initialize the dictionary to keep track of unique dependency keys.
+    hr = DictCreateStringList(&sdDependencies, INITIAL_STRINGDICT_SIZE, DICT_FLAG_CASEINSENSITIVE);
+    ExitOnFailure(hr, "Failed to initialize the unique dependency string list.");
+
+    // Set the registry hive to use depending on install context.
+    hkHive = fMachineContext ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    // Loop over the provider components.
+    hr = WcaOpenExecuteView(vcsDependencyQuery, &hView);
+    ExitOnFailure(hr, "Failed to open the query view for dependencies.");
+
+    while (S_OK == (hr = WcaFetchRecord(hView, &hRec)))
+    {
+        hr = WcaGetRecordString(hRec, dqId, &sczId);
+        ExitOnFailure(hr, "Failed to get WixDependency.WixDependency.");
+
+        hr = WcaGetRecordString(hRec, dqComponent, &sczComponent);
+        ExitOnFailure(hr, "Failed to get WixDependencyProvider.Component_.");
+
+        // Skip the current component if its not being installed or reinstalled.
+        tComponentAction = WcaGetComponentToDo(sczComponent);
+        if (WCA_TODO_INSTALL != tComponentAction && WCA_TODO_REINSTALL != tComponentAction)
+        {
+            WcaLog(LOGMSG_STANDARD, "Skipping dependency check for %ls because the component %ls is not being (re)installed.", sczId, sczComponent);
+            continue;
+        }
+
+        hr = WcaGetRecordString(hRec, dqProviderKey, &sczProviderKey);
+        ExitOnFailure(hr, "Failed to get WixDependency.ProviderKey.");
+
+        hr = WcaGetRecordString(hRec, dqMinVersion, &sczMinVersion);
+        ExitOnFailure(hr, "Failed to get WixDependency.MinVersion.");
+
+        hr = WcaGetRecordString(hRec, dqMaxVersion, &sczMaxVersion);
+        ExitOnFailure(hr, "Failed to get WixDependency.MaxVersion.");
+
+        hr = WcaGetRecordInteger(hRec, dqAttributes, &iAttributes);
+        ExitOnFailure(hr, "Failed to get WixDependency.Attributes.");
+
+        // Check the registry to see if the required providers (dependencies) exist.
+        hr = DepCheckDependency(hkHive, sczProviderKey, sczMinVersion, sczMaxVersion, iAttributes, sdDependencies, &rgDependencies, &cDependencies);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed dependency check for %ls.", sczId);
+        }
+    }
+
+    if (E_NOMOREITEMS != hr)
+    {
+        ExitOnFailure(hr, "Failed to enumerate all of the rows in the dependency query view.");
+    }
+    else
+    {
+        hr = S_OK;
+    }
+
+    // If we collected any dependencies in the previous check, pump a message and prompt the user.
+    if (0 < cDependencies)
+    {
+        hr = CreateDependencyRecord(msierrDependencyMissingDependencies, rgDependencies, cDependencies, &hDependencyRec);
+        ExitOnFailure(hr, "Failed to create the dependency record for message %d.", msierrDependencyMissingDependencies);
+
+        // Send a yes/no message with a warning icon since continuing could be detrimental.
+        // This is sent as a USER message to better detect whether a user or dependency-aware bootstrapper is responding
+        // or if Windows Installer or a dependency-unaware boostrapper is returning a typical default response.
+        er = WcaProcessMessage(static_cast<INSTALLMESSAGE>(INSTALLMESSAGE_USER | MB_ICONWARNING | MB_YESNO | MB_DEFBUTTON2), hDependencyRec);
+        switch (er)
+        {
+        // Only a user or dependency-aware bootstrapper that prompted the user should return IDYES to continue anyway.
+        case IDYES:
+            ExitFunction1(hr = S_OK);
+
+        // Only a user or dependency-aware bootstrapper that prompted the user should return IDNO to terminate the operation.
+        case IDNO:
+            WcaSetReturnValue(ERROR_INSTALL_USEREXIT);
+            ExitFunction1(hr = S_OK);
+
+        // A dependency-aware bootstrapper should return IDCANCEL if running silently and the operation should be canceled.
+        case IDCANCEL:
+            __fallthrough;
+
+        // Bootstrappers which are not dependency-aware may return IDOK for unhandled messages.
+        case IDOK:
+            __fallthrough;
+
+        // Windows Installer returns 0 for USER messages when silent or passive, or when a bootstrapper does not handle the message.
+        case IDNOACTION:
+            WcaSetReturnValue(ERROR_INSTALL_FAILURE);
+            ExitFunction1(hr = S_OK);
+
+        default:
+            ExitOnFailure(hr = E_UNEXPECTED, "Unexpected message response %d from user or bootstrapper application.", er);
+        }
+    }
+
+LExit:
+    ReleaseDependencyArray(rgDependencies, cDependencies);
+    ReleaseStr(sczId);
+    ReleaseStr(sczComponent);
+    ReleaseStr(sczProviderKey);
+    ReleaseStr(sczMinVersion);
+    ReleaseStr(sczMaxVersion);
+    ReleaseDict(sdDependencies);
+
+    return hr;
+}
+
+/***************************************************************************
+ EnsureAbsentDependents - Checks that there are no dependents
+  registered for providers that are being uninstalled.
+
+ Note: Skipped if UPGRADINGPRODUCTCODE is set.
+***************************************************************************/
+static HRESULT EnsureAbsentDependents(
+    __in MSIHANDLE /*hInstall*/,
+    __in BOOL fMachineContext
+    )
+{
+    HRESULT hr = S_OK;
+    DWORD er = ERROR_SUCCESS;
+    STRINGDICT_HANDLE sdIgnoredDependents = NULL;
+    HKEY hkHive = NULL;
+    PMSIHANDLE hView = NULL;
+    PMSIHANDLE hRec = NULL;
+    LPWSTR sczId = NULL;
+    LPWSTR sczComponent = NULL;
+    LPWSTR sczProviderKey = NULL;
+    int iAttributes = 0;
+    WCA_TODO tComponentAction = WCA_TODO_UNKNOWN;
+    DEPENDENCY* rgDependents = NULL;
+    UINT cDependents = 0;
+    PMSIHANDLE hDependencyRec = NULL;
+
+    // Skip the dependent check if the WixDependencyProvider table is missing (no dependency providers).
+    hr = WcaTableExists(L"WixDependencyProvider");
+    if (S_FALSE == hr)
+    {
+        WcaLog(LOGMSG_STANDARD, "Skipping the dependents check since no dependency providers are authored.");
+        ExitFunction1(hr = S_OK);
+    }
+
+    ExitOnFailure(hr, "Failed to check if the WixDependencyProvider table exists.");
+
+    // Split the IGNOREDEPENDENCIES property for use below if set. If it is "ALL", then quit now.
+    hr = SplitIgnoredDependents(&sdIgnoredDependents);
+    ExitOnFailure(hr, "Failed to get the ignored dependents.");
+
+    hr = DictKeyExists(sdIgnoredDependents, L"ALL");
+    if (E_NOTFOUND != hr)
+    {
+        ExitOnFailure(hr, "Failed to check if \"ALL\" was set in IGNOREDEPENDENCIES.");
+
+        // Otherwise...
+        WcaLog(LOGMSG_STANDARD, "Skipping the dependencies check since IGNOREDEPENDENCIES contains \"ALL\".");
+        ExitFunction();
+    }
+    else
+    {
+        // Key was not found, so proceed.
+        hr = S_OK;
+    }
+
+    // Set the registry hive to use depending on install context.
+    hkHive = fMachineContext ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    // Loop over the provider components.
+    hr = WcaOpenExecuteView(vcsDependencyProviderQuery, &hView);
+    ExitOnFailure(hr, "Failed to open the query view for dependency providers.");
+
+    while (S_OK == (hr = WcaFetchRecord(hView, &hRec)))
+    {
+        hr = WcaGetRecordString(hRec, dpqId, &sczId);
+        ExitOnFailure(hr, "Failed to get WixDependencyProvider.WixDependencyProvider.");
+
+        hr = WcaGetRecordString(hRec, dpqComponent, &sczComponent);
+        ExitOnFailure(hr, "Failed to get WixDependencyProvider.Component.");
+
+        // Skip the current component if its not being uninstalled.
+        tComponentAction = WcaGetComponentToDo(sczComponent);
+        if (WCA_TODO_UNINSTALL != tComponentAction)
+        {
+            WcaLog(LOGMSG_STANDARD, "Skipping dependents check for %ls because the component %ls is not being uninstalled.", sczId, sczComponent);
+            continue;
+        }
+
+        hr = WcaGetRecordString(hRec, dpqProviderKey, &sczProviderKey);
+        ExitOnFailure(hr, "Failed to get WixDependencyProvider.ProviderKey.");
+
+        hr = WcaGetRecordInteger(hRec, dpqAttributes, &iAttributes);
+        ExitOnFailure(hr, "Failed to get WixDependencyProvider.Attributes.");
+
+        // Check the registry to see if the provider has any dependents registered.
+        hr = DepCheckDependents(hkHive, sczProviderKey, iAttributes, sdIgnoredDependents, &rgDependents, &cDependents);
+        ExitOnFailure(hr, "Failed dependents check for %ls.", sczId);
+    }
+
+    if (E_NOMOREITEMS != hr)
+    {
+        ExitOnFailure(hr, "Failed to enumerate all of the rows in the dependency provider query view.");
+    }
+    else
+    {
+        hr = S_OK;
+    }
+
+    // If we collected any providers with dependents in the previous check, pump a message and prompt the user.
+    if (0 < cDependents)
+    {
+        hr = CreateDependencyRecord(msierrDependencyHasDependents, rgDependents, cDependents, &hDependencyRec);
+        ExitOnFailure(hr, "Failed to create the dependency record for message %d.", msierrDependencyHasDependents);
+
+        // Send a yes/no message with a warning icon since continuing could be detrimental.
+        // This is sent as a USER message to better detect whether a user or dependency-aware bootstrapper is responding
+        // or if Windows Installer or a dependency-unaware boostrapper is returning a typical default response.
+        er = WcaProcessMessage(static_cast<INSTALLMESSAGE>(INSTALLMESSAGE_USER | MB_ICONWARNING | MB_YESNO | MB_DEFBUTTON2), hDependencyRec);
+        switch (er)
+        {
+        // Only a user or dependency-aware bootstrapper that prompted the user should return IDYES to continue anyway.
+        case IDYES:
+            ExitFunction1(hr = S_OK);
+
+        // Only a user or dependency-aware bootstrapper that prompted the user should return IDNO to terminate the operation.
+        case IDNO:
+            __fallthrough;
+
+        // Bootstrappers which are not dependency-aware may return IDOK for unhandled messages.
+        case IDOK:
+            __fallthrough;
+
+        // Windows Installer returns 0 for USER messages when silent or passive, or when a bootstrapper does not handle the message.
+        case IDNOACTION:
+            WcaSetReturnValue(ERROR_NO_MORE_ITEMS);
+            ExitFunction1(hr = S_OK);
+
+        // A dependency-aware bootstrapper should return IDCANCEL if running silently and the operation should be canceled.
+        case IDCANCEL:
+            WcaSetReturnValue(ERROR_INSTALL_FAILURE);
+            ExitFunction1(hr = S_OK);
+
+        default:
+            hr = E_UNEXPECTED;
+            ExitOnFailure(hr, "Unexpected message response %d from user or bootstrapper application.", er);
+        }
+    }
+
+LExit:
+    ReleaseDependencyArray(rgDependents, cDependents);
+    ReleaseStr(sczId);
+    ReleaseStr(sczComponent);
+    ReleaseStr(sczProviderKey);
+
+    return hr;
+}
+
+/***************************************************************************
+ SplitIgnoredDependents - Splits the IGNOREDEPENDENCIES property into a map.
+
+***************************************************************************/
+static HRESULT SplitIgnoredDependents(
+    __deref_inout STRINGDICT_HANDLE* psdIgnoredDependents
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczIgnoreDependencies = NULL;
+    LPCWSTR wzDelim = L";";
+    LPWSTR wzContext = NULL;
+
+    hr = WcaGetProperty(L"IGNOREDEPENDENCIES", &sczIgnoreDependencies);
+    ExitOnFailure(hr, "Failed to get the string value of the IGNOREDEPENDENCIES property.");
+
+    hr = DictCreateStringList(psdIgnoredDependents, INITIAL_STRINGDICT_SIZE, DICT_FLAG_CASEINSENSITIVE);
+    ExitOnFailure(hr, "Failed to create the string dictionary.");
+
+    // Parse through the semicolon-delimited tokens and add to the string dictionary.
+    for (LPCWSTR wzToken = ::wcstok_s(sczIgnoreDependencies, wzDelim, &wzContext); wzToken; wzToken = ::wcstok_s(NULL, wzDelim, &wzContext))
+    {
+        hr = DictAddKey(*psdIgnoredDependents, wzToken);
+        ExitOnFailure(hr, "Failed to ignored dependency \"%ls\" to the string dictionary.", wzToken);
+    }
+
+LExit:
+    ReleaseStr(sczIgnoreDependencies);
+
+    return hr;
+}
+
+/***************************************************************************
+ CreateDependencyRecord - Creates a record containing the message template
+  and records to send to the UI handler.
+
+ Notes: Callers should call WcaProcessMessage and handle return codes.
+***************************************************************************/
+static HRESULT CreateDependencyRecord(
+    __in int iMessageId,
+    __in_ecount(cDependencies) const DEPENDENCY* rgDependencies,
+    __in UINT cDependencies,
+    __out MSIHANDLE *phRecord
+    )
+{
+    HRESULT hr = S_OK;
+    UINT er = ERROR_SUCCESS;
+    UINT cParams = 0;
+    UINT iParam = 0;
+
+    // Should not be PMSIHANDLE.
+    MSIHANDLE hRec = NULL;
+
+    // Calculate the number of parameters based on the format:
+    // msgId, count, key1, name1, key2, name2, etc.
+    cParams = 2 + 2 * cDependencies;
+
+    hRec = ::MsiCreateRecord(cParams);
+    ExitOnNull(hRec, hr, E_OUTOFMEMORY, "Not enough memory to create the message record.");
+
+    er = ::MsiRecordSetInteger(hRec, ++iParam, iMessageId);
+    ExitOnFailure(hr = HRESULT_FROM_WIN32(er), "Failed to set the message identifier into the message record.");
+
+    er = ::MsiRecordSetInteger(hRec, ++iParam, cDependencies);
+    ExitOnFailure(hr = HRESULT_FROM_WIN32(er), "Failed to set the number of dependencies into the message record.");
+
+    // Now loop through each dependency and add the key and name to the record.
+    for (UINT i = 0; i < cDependencies; i++)
+    {
+        const DEPENDENCY* pDependency = &rgDependencies[i];
+
+        // Log message type-specific information.
+        switch (iMessageId)
+        {
+        // Send a user message when installing a component that is missing some dependencies.
+        case msierrDependencyMissingDependencies:
+            WcaLog(LOGMSG_VERBOSE, "The dependency \"%ls\" is missing or is not the required version.", pDependency->sczKey);
+            break;
+
+        // Send a user message when uninstalling a component that still has registered dependents.
+        case msierrDependencyHasDependents:
+            WcaLog(LOGMSG_VERBOSE, "Found dependent \"%ls\", name: \"%ls\".", pDependency->sczKey, LogDependencyName(pDependency->sczName));
+            break;
+        }
+
+        er = ::MsiRecordSetStringW(hRec, ++iParam, pDependency->sczKey);
+        ExitOnFailure(hr = HRESULT_FROM_WIN32(er), "Failed to set the dependency key \"%ls\" into the message record.", pDependency->sczKey);
+
+        er = ::MsiRecordSetStringW(hRec, ++iParam, pDependency->sczName);
+        ExitOnFailure(hr = HRESULT_FROM_WIN32(er), "Failed to set the dependency name \"%ls\" into the message record.", pDependency->sczName);
+    }
+
+    // Only assign the out parameter if successful to this point.
+    *phRecord = hRec;
+    hRec = NULL;
+
+LExit:
+    if (hRec)
+    {
+        ::MsiCloseHandle(hRec);
+    }
+
+    return hr;
+}
+
+/***************************************************************************
+ LogDependencyName - Returns the dependency name or "Unknown" if null.
+
+***************************************************************************/
+static LPCWSTR LogDependencyName(
+    __in_z LPCWSTR wzName
+    )
+{
+    return wzName ? wzName : L"Unknown";
+}
diff --git a/src/ext/Dependency/ca/wixdepca.def b/src/ext/Dependency/ca/wixdepca.def
new file mode 100644
index 00000000..651c6373
--- /dev/null
+++ b/src/ext/Dependency/ca/wixdepca.def
@@ -0,0 +1,8 @@
+; Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+
+LIBRARY      "dependencyca"
+
+EXPORTS
+        WixDependencyRequire
+        WixDependencyCheck