1 files changed, 1203 insertions, 0 deletions

diff --git a/src/engine/dependency.cpp b/src/engine/dependency.cpp
new file mode 100644
index 00000000..c7c6e024
--- /dev/null
+++ b/src/engine/dependency.cpp
@@ -0,0 +1,1203 @@
+// 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"
+
+// constants
+
+#define INITIAL_STRINGDICT_SIZE 48
+const LPCWSTR vcszIgnoreDependenciesDelim = L";";
+
+
+// internal function declarations
+
+static HRESULT SplitIgnoreDependencies(
+    __in_z LPCWSTR wzIgnoreDependencies,
+    __deref_inout_ecount_opt(*pcDependencies) DEPENDENCY** prgDependencies,
+    __inout LPUINT pcDependencies
+    );
+
+static HRESULT JoinIgnoreDependencies(
+    __out_z LPWSTR* psczIgnoreDependencies,
+    __in_ecount(cDependencies) const DEPENDENCY* rgDependencies,
+    __in UINT cDependencies
+    );
+
+static HRESULT GetIgnoredDependents(
+    __in const BURN_PACKAGE* pPackage,
+    __in const BURN_PLAN* pPlan,
+    __deref_inout STRINGDICT_HANDLE* psdIgnoredDependents
+    );
+
+static HRESULT GetProviderInformation(
+    __in HKEY hkRoot,
+    __in_z LPCWSTR wzProviderKey,
+    __deref_opt_out_z_opt LPWSTR* psczProviderKey,
+    __deref_opt_out_z_opt LPWSTR* psczId
+    );
+
+static void CalculateDependencyActionStates(
+    __in const BURN_PACKAGE* pPackage,
+    __in const BOOTSTRAPPER_ACTION action,
+    __out BURN_DEPENDENCY_ACTION* pDependencyExecuteAction,
+    __out BURN_DEPENDENCY_ACTION* pDependencyRollbackAction
+    );
+
+static HRESULT AddPackageDependencyActions(
+    __in_opt DWORD *pdwInsertSequence,
+    __in const BURN_PACKAGE* pPackage,
+    __in BURN_PLAN* pPlan,
+    __in const BURN_DEPENDENCY_ACTION dependencyExecuteAction,
+    __in const BURN_DEPENDENCY_ACTION dependencyRollbackAction
+    );
+
+static HRESULT RegisterPackageProvider(
+    __in const BURN_PACKAGE* pPackage
+    );
+
+static void UnregisterPackageProvider(
+    __in const BURN_PACKAGE* pPackage
+    );
+
+static HRESULT RegisterPackageDependency(
+    __in BOOL fPerMachine,
+    __in const BURN_PACKAGE* pPackage,
+    __in_z LPCWSTR wzDependentProviderKey
+    );
+
+static void UnregisterPackageDependency(
+    __in BOOL fPerMachine,
+    __in const BURN_PACKAGE* pPackage,
+    __in_z LPCWSTR wzDependentProviderKey
+    );
+
+static BOOL PackageProviderExists(
+    __in const BURN_PACKAGE* pPackage
+    );
+
+
+// functions
+
+extern "C" void DependencyUninitialize(
+    __in BURN_DEPENDENCY_PROVIDER* pProvider
+    )
+{
+    ReleaseStr(pProvider->sczKey);
+    ReleaseStr(pProvider->sczVersion);
+    ReleaseStr(pProvider->sczDisplayName);
+    memset(pProvider, 0, sizeof(BURN_DEPENDENCY_PROVIDER));
+}
+
+extern "C" HRESULT DependencyParseProvidersFromXml(
+    __in BURN_PACKAGE* pPackage,
+    __in IXMLDOMNode* pixnPackage
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNodeList* pixnNodes = NULL;
+    DWORD cNodes = 0;
+    IXMLDOMNode* pixnNode = NULL;
+
+    // Select dependency provider nodes.
+    hr = XmlSelectNodes(pixnPackage, L"Provides", &pixnNodes);
+    ExitOnFailure(hr, "Failed to select dependency provider nodes.");
+
+    // Get dependency provider node count.
+    hr = pixnNodes->get_length((long*)&cNodes);
+    ExitOnFailure(hr, "Failed to get the dependency provider node count.");
+
+    if (!cNodes)
+    {
+        ExitFunction1(hr = S_OK);
+    }
+
+    // Allocate memory for dependency provider pointers.
+    pPackage->rgDependencyProviders = (BURN_DEPENDENCY_PROVIDER*)MemAlloc(sizeof(BURN_DEPENDENCY_PROVIDER) * cNodes, TRUE);
+    ExitOnNull(pPackage->rgDependencyProviders, hr, E_OUTOFMEMORY, "Failed to allocate memory for dependency providers.");
+
+    pPackage->cDependencyProviders = cNodes;
+
+    // Parse dependency provider elements.
+    for (DWORD i = 0; i < cNodes; i++)
+    {
+        BURN_DEPENDENCY_PROVIDER* pDependencyProvider = &pPackage->rgDependencyProviders[i];
+
+        hr = XmlNextElement(pixnNodes, &pixnNode, NULL);
+        ExitOnFailure(hr, "Failed to get the next dependency provider node.");
+
+        // @Key
+        hr = XmlGetAttributeEx(pixnNode, L"Key", &pDependencyProvider->sczKey);
+        ExitOnFailure(hr, "Failed to get the Key attribute.");
+
+        // @Version
+        hr = XmlGetAttributeEx(pixnNode, L"Version", &pDependencyProvider->sczVersion);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get the Version attribute.");
+        }
+
+        // @DisplayName
+        hr = XmlGetAttributeEx(pixnNode, L"DisplayName", &pDependencyProvider->sczDisplayName);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get the DisplayName attribute.");
+        }
+
+        // @Imported
+        hr = XmlGetYesNoAttribute(pixnNode, L"Imported", &pDependencyProvider->fImported);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get the Imported attribute.");
+        }
+        else
+        {
+            pDependencyProvider->fImported = FALSE;
+            hr = S_OK;
+        }
+
+        // Prepare next iteration.
+        ReleaseNullObject(pixnNode);
+    }
+
+    hr = S_OK;
+
+LExit:
+    ReleaseObject(pixnNode);
+    ReleaseObject(pixnNodes);
+
+    return hr;
+}
+
+extern "C" HRESULT DependencyDetectProviderKeyPackageId(
+    __in const BURN_PACKAGE* pPackage,
+    __deref_opt_out_z_opt LPWSTR* psczProviderKey,
+    __deref_opt_out_z_opt LPWSTR* psczId
+    )
+{
+    HRESULT hr = E_NOTFOUND;
+    LPWSTR wzProviderKey = NULL;
+    HKEY hkRoot = pPackage->fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+    {
+        const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+        // Find the first package id registered for the provider key.
+        hr = GetProviderInformation(hkRoot, pProvider->sczKey, psczProviderKey, psczId);
+        if (E_NOTFOUND == hr)
+        {
+            continue;
+        }
+        ExitOnFailure(hr, "Failed to get the package provider information.");
+
+        ExitFunction();
+    }
+
+    // Older bundles may not have written the id so try the default.
+    if (BURN_PACKAGE_TYPE_MSI == pPackage->type)
+    {
+        wzProviderKey = pPackage->Msi.sczProductCode;
+    }
+
+    if (wzProviderKey)
+    {
+        hr = GetProviderInformation(hkRoot, wzProviderKey, psczProviderKey, psczId);
+        if (E_NOTFOUND == hr)
+        {
+            ExitFunction();
+        }
+        ExitOnFailure(hr, "Failed to get the package default provider information.");
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyDetectProviderKeyBundleId(
+    __in BURN_REGISTRATION* pRegistration
+    )
+{
+    HRESULT hr = S_OK;
+
+    hr = DepGetProviderInformation(pRegistration->hkRoot, pRegistration->sczProviderKey, &pRegistration->sczDetectedProviderKeyBundleId, NULL, NULL);
+    if (E_NOTFOUND == hr)
+    {
+        ExitFunction();
+    }
+    ExitOnFailure(hr, "Failed to get provider key bundle id.");
+
+    // If a bundle id was not explicitly set, default the provider key bundle id to this bundle's provider key.
+    if (!pRegistration->sczDetectedProviderKeyBundleId || !*pRegistration->sczDetectedProviderKeyBundleId)
+    {
+        hr = StrAllocString(&pRegistration->sczDetectedProviderKeyBundleId, pRegistration->sczProviderKey, 0);
+        ExitOnFailure(hr, "Failed to initialize provider key bundle id.");
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyPlanInitialize(
+    __in const BURN_ENGINE_STATE* pEngineState,
+    __in BURN_PLAN* pPlan
+    )
+{
+    HRESULT hr = S_OK;
+
+    // The current bundle provider key should always be ignored for dependency checks.
+    hr = DepDependencyArrayAlloc(&pPlan->rgPlannedProviders, &pPlan->cPlannedProviders, pEngineState->registration.sczProviderKey, NULL);
+    ExitOnFailure(hr, "Failed to add the bundle provider key to the list of dependencies to ignore.");
+
+    // Add the list of dependencies to ignore to the plan.
+    if (pEngineState->sczIgnoreDependencies)
+    {
+        // TODO: After adding enumeration to STRINGDICT, a single STRINGDICT_HANDLE can be used everywhere.
+        hr = SplitIgnoreDependencies(pEngineState->sczIgnoreDependencies, &pPlan->rgPlannedProviders, &pPlan->cPlannedProviders);
+        ExitOnFailure(hr, "Failed to split the list of dependencies to ignore.");
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyAllocIgnoreDependencies(
+    __in const BURN_PLAN *pPlan,
+    __out_z LPWSTR* psczIgnoreDependencies
+    )
+{
+    HRESULT hr = S_OK;
+
+    // Join the list of dependencies to ignore for each related bundle.
+    if (0 < pPlan->cPlannedProviders)
+    {
+        hr = JoinIgnoreDependencies(psczIgnoreDependencies, pPlan->rgPlannedProviders, pPlan->cPlannedProviders);
+        ExitOnFailure(hr, "Failed to join the list of dependencies to ignore.");
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyAddIgnoreDependencies(
+    __in STRINGDICT_HANDLE sdIgnoreDependencies,
+    __in_z LPCWSTR wzAddIgnoreDependencies
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR wzContext = NULL;
+
+    // Parse through the semicolon-delimited tokens and add to the array.
+    for (LPCWSTR wzToken = ::wcstok_s(const_cast<LPWSTR>(wzAddIgnoreDependencies), vcszIgnoreDependenciesDelim, &wzContext); wzToken; wzToken = ::wcstok_s(NULL, vcszIgnoreDependenciesDelim, &wzContext))
+    {
+        hr = DictKeyExists(sdIgnoreDependencies, wzToken);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to check the dictionary of unique dependencies.");
+        }
+        else
+        {
+            hr = DictAddKey(sdIgnoreDependencies, wzToken);
+            ExitOnFailure(hr, "Failed to add \"%ls\" to the string dictionary.", wzToken);
+        }
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" BOOL DependencyDependentExists(
+    __in const BURN_REGISTRATION* pRegistration,
+    __in_z LPCWSTR wzDependentProviderKey
+    )
+{
+    HRESULT hr = S_OK;
+
+    hr = DepDependentExists(pRegistration->hkRoot, pRegistration->sczProviderKey, wzDependentProviderKey);
+    return SUCCEEDED(hr);
+}
+
+extern "C" HRESULT DependencyPlanPackageBegin(
+    __in BOOL fPerMachine,
+    __in BURN_PACKAGE* pPackage,
+    __in BURN_PLAN* pPlan
+    )
+{
+    HRESULT hr = S_OK;
+    STRINGDICT_HANDLE sdIgnoredDependents = NULL;
+    DEPENDENCY* rgDependents = NULL;
+    UINT cDependents = 0;
+    HKEY hkHive = pPackage->fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+    BURN_DEPENDENCY_ACTION dependencyExecuteAction = BURN_DEPENDENCY_ACTION_NONE;
+    BURN_DEPENDENCY_ACTION dependencyRollbackAction = BURN_DEPENDENCY_ACTION_NONE;
+
+    pPackage->dependencyExecute = BURN_DEPENDENCY_ACTION_NONE;
+    pPackage->dependencyRollback = BURN_DEPENDENCY_ACTION_NONE;
+
+    // Make sure the package defines at least one provider.
+    if (0 == pPackage->cDependencyProviders)
+    {
+        LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_SKIP_NOPROVIDERS, pPackage->sczId);
+        ExitFunction1(hr = S_OK);
+    }
+
+    // Make sure the package is in the same scope as the bundle.
+    if (fPerMachine != pPackage->fPerMachine)
+    {
+        LogId(REPORT_STANDARD, MSG_DEPENDENCY_PACKAGE_SKIP_WRONGSCOPE, pPackage->sczId, LoggingPerMachineToString(fPerMachine), LoggingPerMachineToString(pPackage->fPerMachine));
+        ExitFunction1(hr = S_OK);
+    }
+
+    // If we're uninstalling the package, check if any dependents are registered.
+    if (BOOTSTRAPPER_ACTION_STATE_UNINSTALL == pPackage->execute)
+    {
+        // Build up a list of dependents to ignore, including the current bundle.
+        hr = GetIgnoredDependents(pPackage, pPlan, &sdIgnoredDependents);
+        ExitOnFailure(hr, "Failed to build the list of ignored dependents.");
+
+        // Skip the dependency check if "ALL" was authored for IGNOREDEPENDENCIES.
+        hr = DictKeyExists(sdIgnoredDependents, L"ALL");
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to check if \"ALL\" was set in IGNOREDEPENDENCIES.");
+        }
+        else
+        {
+            for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+            {
+                const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+                hr = DepCheckDependents(hkHive, pProvider->sczKey, 0, sdIgnoredDependents, &rgDependents, &cDependents);
+                if (E_FILENOTFOUND != hr)
+                {
+                    ExitOnFailure(hr, "Failed dependents check on package provider: %ls", pProvider->sczKey);
+                }
+                else
+                {
+                    hr = S_OK;
+                }
+            }
+        }
+    }
+
+    // Calculate the dependency actions before the package itself is planned.
+    CalculateDependencyActionStates(pPackage, pPlan->action, &dependencyExecuteAction, &dependencyRollbackAction);
+
+    // If dependents were found, change the action to not uninstall the package.
+    if (0 < cDependents)
+    {
+        LogId(REPORT_STANDARD, MSG_DEPENDENCY_PACKAGE_HASDEPENDENTS, pPackage->sczId, cDependents);
+
+        for (DWORD i = 0; i < cDependents; ++i)
+        {
+            const DEPENDENCY* pDependency = &rgDependents[i];
+            LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_DEPENDENT, pDependency->sczKey, LoggingStringOrUnknownIfNull(pDependency->sczName));
+        }
+
+        pPackage->fDependencyManagerWasHere = TRUE;
+        pPackage->execute = BOOTSTRAPPER_ACTION_STATE_NONE;
+        pPackage->rollback = BOOTSTRAPPER_ACTION_STATE_NONE;
+    }
+    // Use the calculated dependency actions as the provider actions if there
+    // are any non-imported providers that need to be registered and the package
+    // is current (not obsolete).
+    else if (BOOTSTRAPPER_PACKAGE_STATE_OBSOLETE != pPackage->currentState)
+    {
+        BOOL fAllImportedProviders = TRUE; // assume all providers were imported.
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+            if (!pProvider->fImported)
+            {
+                fAllImportedProviders = FALSE;
+                break;
+            }
+        }
+
+        if (!fAllImportedProviders)
+        {
+            pPackage->providerExecute = dependencyExecuteAction;
+            pPackage->providerRollback = dependencyRollbackAction;
+        }
+    }
+
+    // If the package will be removed, add its providers to the growing list in the plan.
+    if (BOOTSTRAPPER_ACTION_STATE_UNINSTALL == pPackage->execute)
+    {
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+            hr = DepDependencyArrayAlloc(&pPlan->rgPlannedProviders, &pPlan->cPlannedProviders, pProvider->sczKey, NULL);
+            ExitOnFailure(hr, "Failed to add the package provider key \"%ls\" to the planned list.", pProvider->sczKey);
+        }
+    }
+
+    pPackage->dependencyExecute = dependencyExecuteAction;
+    pPackage->dependencyRollback = dependencyRollbackAction;
+
+LExit:
+    ReleaseDependencyArray(rgDependents, cDependents);
+    ReleaseDict(sdIgnoredDependents);
+
+    return hr;
+}
+
+extern "C" HRESULT DependencyPlanPackage(
+    __in_opt DWORD *pdwInsertSequence,
+    __in const BURN_PACKAGE* pPackage,
+    __in BURN_PLAN* pPlan
+    )
+{
+    HRESULT hr = S_OK;
+    BURN_EXECUTE_ACTION* pAction = NULL;
+
+    // If the dependency execution action is to unregister, add the dependency actions to the plan
+    // *before* the provider key is potentially removed.
+    if (BURN_DEPENDENCY_ACTION_UNREGISTER == pPackage->dependencyExecute)
+    {
+        hr = AddPackageDependencyActions(pdwInsertSequence, pPackage, pPlan, pPackage->dependencyExecute, pPackage->dependencyRollback);
+        ExitOnFailure(hr, "Failed to plan the dependency actions for package: %ls", pPackage->sczId);
+    }
+
+    // Add the provider rollback plan.
+    if (BURN_DEPENDENCY_ACTION_NONE != pPackage->providerRollback)
+    {
+        hr = PlanAppendRollbackAction(pPlan, &pAction);
+        ExitOnFailure(hr, "Failed to append provider rollback action.");
+
+        pAction->type = BURN_EXECUTE_ACTION_TYPE_PACKAGE_PROVIDER;
+        pAction->packageProvider.pPackage = const_cast<BURN_PACKAGE*>(pPackage);
+        pAction->packageProvider.action = pPackage->providerRollback;
+
+        // Put a checkpoint before the execute action so that rollback happens
+        // if execute fails.
+        hr = PlanExecuteCheckpoint(pPlan);
+        ExitOnFailure(hr, "Failed to plan provider checkpoint action.");
+    }
+
+    // Add the provider execute plan. This comes after rollback so if something goes wrong
+    // rollback will try to clean up after us.
+    if (BURN_DEPENDENCY_ACTION_NONE != pPackage->providerExecute)
+    {
+        if (NULL != pdwInsertSequence)
+        {
+            hr = PlanInsertExecuteAction(*pdwInsertSequence, pPlan, &pAction);
+            ExitOnFailure(hr, "Failed to insert provider execute action.");
+
+            // Always move the sequence after this dependency action so the provider registration
+            // stays in front of the inserted actions.
+            ++(*pdwInsertSequence);
+        }
+        else
+        {
+            hr = PlanAppendExecuteAction(pPlan, &pAction);
+            ExitOnFailure(hr, "Failed to append provider execute action.");
+        }
+
+        pAction->type = BURN_EXECUTE_ACTION_TYPE_PACKAGE_PROVIDER;
+        pAction->packageProvider.pPackage = const_cast<BURN_PACKAGE*>(pPackage);
+        pAction->packageProvider.action = pPackage->providerExecute;
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyPlanPackageComplete(
+    __in BURN_PACKAGE* pPackage,
+    __in BURN_PLAN* pPlan
+    )
+{
+    HRESULT hr = S_OK;
+
+    // Registration of dependencies happens here, after the package is planned to be
+    // installed and all that good stuff.
+    if (BURN_DEPENDENCY_ACTION_REGISTER == pPackage->dependencyExecute)
+    {
+        // Recalculate the dependency actions in case other operations may have changed
+        // the package execution state.
+        CalculateDependencyActionStates(pPackage, pPlan->action, &pPackage->dependencyExecute, &pPackage->dependencyRollback);
+
+        // If the dependency execution action is *still* to register, add the dependency actions to the plan.
+        if (BURN_DEPENDENCY_ACTION_REGISTER == pPackage->dependencyExecute)
+        {
+            hr = AddPackageDependencyActions(NULL, pPackage, pPlan, pPackage->dependencyExecute, pPackage->dependencyRollback);
+            ExitOnFailure(hr, "Failed to plan the dependency actions for package: %ls", pPackage->sczId);
+        }
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" HRESULT DependencyExecutePackageProviderAction(
+    __in const BURN_EXECUTE_ACTION* pAction
+    )
+{
+    AssertSz(BURN_EXECUTE_ACTION_TYPE_PACKAGE_PROVIDER == pAction->type, "Execute action type not supported by this function.");
+
+    HRESULT hr = S_OK;
+    const BURN_PACKAGE* pPackage = pAction->packageProvider.pPackage;
+
+    // Register or unregister the package provider(s).
+    if (BURN_DEPENDENCY_ACTION_REGISTER == pAction->packageProvider.action)
+    {
+        hr = RegisterPackageProvider(pPackage);
+        ExitOnFailure(hr, "Failed to register the package providers.");
+    }
+    else if (BURN_DEPENDENCY_ACTION_UNREGISTER == pAction->packageProvider.action)
+    {
+        UnregisterPackageProvider(pPackage);
+    }
+
+LExit:
+    if (!pPackage->fVital)
+    {
+        hr = S_OK;
+    }
+
+    return hr;
+}
+
+extern "C" HRESULT DependencyExecutePackageDependencyAction(
+    __in BOOL fPerMachine,
+    __in const BURN_EXECUTE_ACTION* pAction
+    )
+{
+    AssertSz(BURN_EXECUTE_ACTION_TYPE_PACKAGE_DEPENDENCY == pAction->type, "Execute action type not supported by this function.");
+
+    HRESULT hr = S_OK;
+    const BURN_PACKAGE* pPackage = pAction->packageDependency.pPackage;
+
+    // Register or unregister the bundle as a dependent of each package dependency provider.
+    if (BURN_DEPENDENCY_ACTION_REGISTER == pAction->packageDependency.action)
+    {
+        hr = RegisterPackageDependency(fPerMachine, pPackage, pAction->packageDependency.sczBundleProviderKey);
+        ExitOnFailure(hr, "Failed to register the dependency on the package provider.");
+    }
+    else if (BURN_DEPENDENCY_ACTION_UNREGISTER == pAction->packageDependency.action)
+    {
+        UnregisterPackageDependency(fPerMachine, pPackage, pAction->packageDependency.sczBundleProviderKey);
+    }
+
+LExit:
+    if (!pPackage->fVital)
+    {
+        hr = S_OK;
+    }
+
+    return hr;
+}
+
+extern "C" HRESULT DependencyRegisterBundle(
+    __in const BURN_REGISTRATION* pRegistration
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczVersion = NULL;
+
+    hr = FileVersionToStringEx(pRegistration->qwVersion, &sczVersion);
+    ExitOnFailure(hr, "Failed to format the registration version string.");
+
+    LogId(REPORT_VERBOSE, MSG_DEPENDENCY_BUNDLE_REGISTER, pRegistration->sczProviderKey, sczVersion);
+
+    // Register the bundle provider key.
+    hr = DepRegisterDependency(pRegistration->hkRoot, pRegistration->sczProviderKey, sczVersion, pRegistration->sczDisplayName, pRegistration->sczId, 0);
+    ExitOnFailure(hr, "Failed to register the bundle dependency provider.");
+
+LExit:
+    ReleaseStr(sczVersion);
+
+    return hr;
+}
+
+extern "C" HRESULT DependencyProcessDependentRegistration(
+    __in const BURN_REGISTRATION* pRegistration,
+    __in const BURN_DEPENDENT_REGISTRATION_ACTION* pAction
+    )
+{
+    HRESULT hr = S_OK;
+
+    switch (pAction->type)
+    {
+    case BURN_DEPENDENT_REGISTRATION_ACTION_TYPE_REGISTER:
+        hr = DepRegisterDependent(pRegistration->hkRoot, pRegistration->sczProviderKey, pAction->sczDependentProviderKey, NULL, NULL, 0);
+        ExitOnFailure(hr, "Failed to register dependent: %ls", pAction->sczDependentProviderKey);
+        break;
+
+    case BURN_DEPENDENT_REGISTRATION_ACTION_TYPE_UNREGISTER:
+        hr = DepUnregisterDependent(pRegistration->hkRoot, pRegistration->sczProviderKey, pAction->sczDependentProviderKey);
+        ExitOnFailure(hr, "Failed to unregister dependent: %ls", pAction->sczDependentProviderKey);
+        break;
+
+    default:
+        hr = E_INVALIDARG;
+        ExitOnRootFailure(hr, "Unrecognized registration action type: %d", pAction->type);
+    }
+
+LExit:
+    return hr;
+}
+
+extern "C" void DependencyUnregisterBundle(
+    __in const BURN_REGISTRATION* pRegistration
+    )
+{
+    HRESULT hr = S_OK;
+
+    // Remove the bundle provider key.
+    hr = DepUnregisterDependency(pRegistration->hkRoot, pRegistration->sczProviderKey);
+    if (SUCCEEDED(hr))
+    {
+        LogId(REPORT_VERBOSE, MSG_DEPENDENCY_BUNDLE_UNREGISTERED, pRegistration->sczProviderKey);
+    }
+    else if (FAILED(hr) && E_FILENOTFOUND != hr)
+    {
+        LogId(REPORT_VERBOSE, MSG_DEPENDENCY_BUNDLE_UNREGISTERED_FAILED, pRegistration->sczProviderKey, hr);
+    }
+}
+
+// internal functions
+
+/********************************************************************
+ SplitIgnoreDependencies - Splits a semicolon-delimited
+  string into a list of unique dependencies to ignore.
+
+*********************************************************************/
+static HRESULT SplitIgnoreDependencies(
+    __in_z LPCWSTR wzIgnoreDependencies,
+    __deref_inout_ecount_opt(*pcDependencies) DEPENDENCY** prgDependencies,
+    __inout LPUINT pcDependencies
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR wzContext = NULL;
+    STRINGDICT_HANDLE sdIgnoreDependencies = NULL;
+
+    // Create a dictionary to hold unique dependencies.
+    hr = DictCreateStringList(&sdIgnoreDependencies, INITIAL_STRINGDICT_SIZE, DICT_FLAG_CASEINSENSITIVE);
+    ExitOnFailure(hr, "Failed to create the string dictionary.");
+
+    // Parse through the semicolon-delimited tokens and add to the array.
+    for (LPCWSTR wzToken = ::wcstok_s(const_cast<LPWSTR>(wzIgnoreDependencies), vcszIgnoreDependenciesDelim, &wzContext); wzToken; wzToken = ::wcstok_s(NULL, vcszIgnoreDependenciesDelim, &wzContext))
+    {
+        hr = DictKeyExists(sdIgnoreDependencies, wzToken);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to check the dictionary of unique dependencies.");
+        }
+        else
+        {
+            hr = DepDependencyArrayAlloc(prgDependencies, pcDependencies, wzToken, NULL);
+            ExitOnFailure(hr, "Failed to add \"%ls\" to the list of dependencies to ignore.", wzToken);
+
+            hr = DictAddKey(sdIgnoreDependencies, wzToken);
+            ExitOnFailure(hr, "Failed to add \"%ls\" to the string dictionary.", wzToken);
+        }
+    }
+
+LExit:
+    ReleaseDict(sdIgnoreDependencies);
+
+    return hr;
+}
+
+/********************************************************************
+ JoinIgnoreDependencies - Joins a list of dependencies
+  to ignore into a semicolon-delimited string of unique values.
+
+*********************************************************************/
+static HRESULT JoinIgnoreDependencies(
+    __out_z LPWSTR* psczIgnoreDependencies,
+    __in_ecount(cDependencies) const DEPENDENCY* rgDependencies,
+    __in UINT cDependencies
+    )
+{
+    HRESULT hr = S_OK;
+    STRINGDICT_HANDLE sdIgnoreDependencies = NULL;
+
+    // Make sure we pass back an empty string if there are no dependencies.
+    if (0 == cDependencies)
+    {
+        ExitFunction1(hr = S_OK);
+    }
+
+    // Create a dictionary to hold unique dependencies.
+    hr = DictCreateStringList(&sdIgnoreDependencies, INITIAL_STRINGDICT_SIZE, DICT_FLAG_CASEINSENSITIVE);
+    ExitOnFailure(hr, "Failed to create the string dictionary.");
+
+    for (UINT i = 0; i < cDependencies; ++i)
+    {
+        const DEPENDENCY* pDependency = &rgDependencies[i];
+
+        hr = DictKeyExists(sdIgnoreDependencies, pDependency->sczKey);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to check the dictionary of unique dependencies.");
+        }
+        else
+        {
+            if (0 < i)
+            {
+                hr = StrAllocConcat(psczIgnoreDependencies, vcszIgnoreDependenciesDelim, 1);
+                ExitOnFailure(hr, "Failed to append the string delimiter.");
+            }
+
+            hr = StrAllocConcat(psczIgnoreDependencies, pDependency->sczKey, 0);
+            ExitOnFailure(hr, "Failed to append the key \"%ls\".", pDependency->sczKey);
+
+            hr = DictAddKey(sdIgnoreDependencies, pDependency->sczKey);
+            ExitOnFailure(hr, "Failed to add \"%ls\" to the string dictionary.", pDependency->sczKey);
+        }
+    }
+
+LExit:
+    ReleaseDict(sdIgnoreDependencies);
+
+    return hr;
+}
+
+/********************************************************************
+ GetIgnoredDependents - Combines the current bundle's
+  provider key, packages' provider keys that are being uninstalled,
+  and any ignored dependencies authored for packages into a string
+  list to pass to deputil.
+
+*********************************************************************/
+static HRESULT GetIgnoredDependents(
+    __in const BURN_PACKAGE* pPackage,
+    __in const BURN_PLAN* pPlan,
+    __deref_inout STRINGDICT_HANDLE* psdIgnoredDependents
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczIgnoreDependencies = NULL;
+
+    // Create the dictionary and add the bundle provider key initially.
+    hr = DictCreateStringList(psdIgnoredDependents, INITIAL_STRINGDICT_SIZE, DICT_FLAG_CASEINSENSITIVE);
+    ExitOnFailure(hr, "Failed to create the string dictionary.");
+
+    hr = DictAddKey(*psdIgnoredDependents, pPlan->wzBundleProviderKey);
+    ExitOnFailure(hr, "Failed to add the bundle provider key \"%ls\" to the list of ignored dependencies.", pPlan->wzBundleProviderKey);
+
+    // Add previously planned package providers to the dictionary.
+    for (DWORD i = 0; i < pPlan->cPlannedProviders; ++i)
+    {
+        const DEPENDENCY* pDependency = &pPlan->rgPlannedProviders[i];
+
+        hr = DictAddKey(*psdIgnoredDependents, pDependency->sczKey);
+        ExitOnFailure(hr, "Failed to add the package provider key \"%ls\" to the list of ignored dependencies.", pDependency->sczKey);
+    }
+
+    // Get the IGNOREDEPENDENCIES property if defined.
+    hr = PackageGetProperty(pPackage, DEPENDENCY_IGNOREDEPENDENCIES, &sczIgnoreDependencies);
+    if (E_NOTFOUND != hr)
+    {
+        ExitOnFailure(hr, "Failed to get the package property: %ls", DEPENDENCY_IGNOREDEPENDENCIES);
+
+        hr = DependencyAddIgnoreDependencies(*psdIgnoredDependents, sczIgnoreDependencies);
+        ExitOnFailure(hr, "Failed to add the authored ignored dependencies to the cumulative list of ignored dependencies.");
+    }
+    else
+    {
+        hr = S_OK;
+    }
+
+LExit:
+    ReleaseStr(sczIgnoreDependencies);
+
+    return hr;
+}
+
+/********************************************************************
+ GetProviderId - Gets the ID of the package given the provider key.
+
+*********************************************************************/
+static HRESULT GetProviderInformation(
+    __in HKEY hkRoot,
+    __in_z LPCWSTR wzProviderKey,
+    __deref_opt_out_z_opt LPWSTR* psczProviderKey,
+    __deref_opt_out_z_opt LPWSTR* psczId
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczId = NULL;
+
+    hr = DepGetProviderInformation(hkRoot, wzProviderKey, &sczId, NULL, NULL);
+    if (E_NOTFOUND == hr)
+    {
+        ExitFunction();
+    }
+    ExitOnFailure(hr, "Failed to get the provider key package id.");
+
+    // If the id was registered return it and exit.
+    if (sczId && *sczId)
+    {
+        if (psczProviderKey)
+        {
+            hr = StrAllocString(psczProviderKey, wzProviderKey, 0);
+            ExitOnFailure(hr, "Failed to copy the provider key.");
+        }
+
+        if (psczId)
+        {
+            *psczId = sczId;
+            sczId = NULL;
+        }
+
+        ExitFunction();
+    }
+    else
+    {
+        hr = E_NOTFOUND;
+    }
+
+LExit:
+    ReleaseStr(sczId);
+
+    return hr;
+}
+
+/********************************************************************
+ CalculateDependencyActionStates - Calculates the dependency execute and
+  rollback actions for a package.
+
+*********************************************************************/
+static void CalculateDependencyActionStates(
+    __in const BURN_PACKAGE* pPackage,
+    __in const BOOTSTRAPPER_ACTION action,
+    __out BURN_DEPENDENCY_ACTION* pDependencyExecuteAction,
+    __out BURN_DEPENDENCY_ACTION* pDependencyRollbackAction
+    )
+{
+    switch (action)
+    {
+    case BOOTSTRAPPER_ACTION_UNINSTALL:
+        // Always remove the dependency when uninstalling a bundle even if the package is absent.
+        *pDependencyExecuteAction = BURN_DEPENDENCY_ACTION_UNREGISTER;
+        break;
+    case BOOTSTRAPPER_ACTION_INSTALL: __fallthrough;
+    case BOOTSTRAPPER_ACTION_CACHE:
+        // Always remove the dependency during rollback when installing a bundle.
+        *pDependencyRollbackAction = BURN_DEPENDENCY_ACTION_UNREGISTER;
+        __fallthrough;
+    case BOOTSTRAPPER_ACTION_MODIFY: __fallthrough;
+    case BOOTSTRAPPER_ACTION_REPAIR:
+        switch (pPackage->execute)
+        {
+        case BOOTSTRAPPER_ACTION_STATE_NONE:
+            switch (pPackage->requested)
+            {
+            case BOOTSTRAPPER_REQUEST_STATE_NONE:
+                // Register if a newer, compatible package is already installed.
+                switch (pPackage->currentState)
+                {
+                case BOOTSTRAPPER_PACKAGE_STATE_OBSOLETE:
+                    if (!PackageProviderExists(pPackage))
+                    {
+                        break;
+                    }
+                    __fallthrough;
+                case BOOTSTRAPPER_PACKAGE_STATE_SUPERSEDED:
+                    *pDependencyExecuteAction = BURN_DEPENDENCY_ACTION_REGISTER;
+                    break;
+                }
+                break;
+            case BOOTSTRAPPER_REQUEST_STATE_PRESENT: __fallthrough;
+            case BOOTSTRAPPER_REQUEST_STATE_REPAIR:
+                // Register if the package is requested but already installed.
+                switch (pPackage->currentState)
+                {
+                case BOOTSTRAPPER_PACKAGE_STATE_OBSOLETE:
+                    if (!PackageProviderExists(pPackage))
+                    {
+                        break;
+                    }
+                    __fallthrough;
+                case BOOTSTRAPPER_PACKAGE_STATE_PRESENT: __fallthrough;
+                case BOOTSTRAPPER_PACKAGE_STATE_SUPERSEDED:
+                    *pDependencyExecuteAction = BURN_DEPENDENCY_ACTION_REGISTER;
+                    break;
+                }
+                break;
+            }
+            break;
+        case BOOTSTRAPPER_ACTION_STATE_UNINSTALL:
+            *pDependencyExecuteAction = BURN_DEPENDENCY_ACTION_UNREGISTER;
+            break;
+        case BOOTSTRAPPER_ACTION_STATE_INSTALL: __fallthrough;
+        case BOOTSTRAPPER_ACTION_STATE_MODIFY: __fallthrough;
+        case BOOTSTRAPPER_ACTION_STATE_REPAIR: __fallthrough;
+        case BOOTSTRAPPER_ACTION_STATE_MINOR_UPGRADE: __fallthrough;
+        case BOOTSTRAPPER_ACTION_STATE_MAJOR_UPGRADE: __fallthrough;
+        case BOOTSTRAPPER_ACTION_STATE_PATCH:
+            *pDependencyExecuteAction = BURN_DEPENDENCY_ACTION_REGISTER;
+            break;
+        }
+        break;
+    }
+
+    switch (*pDependencyExecuteAction)
+    {
+    case BURN_DEPENDENCY_ACTION_REGISTER:
+        switch (pPackage->currentState)
+        {
+        case BOOTSTRAPPER_PACKAGE_STATE_OBSOLETE: __fallthrough;
+        case BOOTSTRAPPER_PACKAGE_STATE_ABSENT: __fallthrough;
+        case BOOTSTRAPPER_PACKAGE_STATE_CACHED:
+            *pDependencyRollbackAction = BURN_DEPENDENCY_ACTION_UNREGISTER;
+            break;
+        }
+        break;
+    case BURN_DEPENDENCY_ACTION_UNREGISTER:
+        switch (pPackage->currentState)
+        {
+        case BOOTSTRAPPER_PACKAGE_STATE_PRESENT: __fallthrough;
+        case BOOTSTRAPPER_PACKAGE_STATE_SUPERSEDED:
+            *pDependencyRollbackAction = BURN_DEPENDENCY_ACTION_REGISTER;
+            break;
+        }
+        break;
+    }
+}
+
+/********************************************************************
+ AddPackageDependencyActions - Adds the dependency execute and rollback
+  actions to the plan.
+
+*********************************************************************/
+static HRESULT AddPackageDependencyActions(
+    __in_opt DWORD *pdwInsertSequence,
+    __in const BURN_PACKAGE* pPackage,
+    __in BURN_PLAN* pPlan,
+    __in const BURN_DEPENDENCY_ACTION dependencyExecuteAction,
+    __in const BURN_DEPENDENCY_ACTION dependencyRollbackAction
+    )
+{
+    HRESULT hr = S_OK;
+    BURN_EXECUTE_ACTION* pAction = NULL;
+
+    // Add the rollback plan.
+    if (BURN_DEPENDENCY_ACTION_NONE != dependencyRollbackAction)
+    {
+        hr = PlanAppendRollbackAction(pPlan, &pAction);
+        ExitOnFailure(hr, "Failed to append rollback action.");
+
+        pAction->type = BURN_EXECUTE_ACTION_TYPE_PACKAGE_DEPENDENCY;
+        pAction->packageDependency.pPackage = const_cast<BURN_PACKAGE*>(pPackage);
+        pAction->packageDependency.action = dependencyRollbackAction;
+
+        hr = StrAllocString(&pAction->packageDependency.sczBundleProviderKey, pPlan->wzBundleProviderKey, 0);
+        ExitOnFailure(hr, "Failed to copy the bundle dependency provider.");
+
+        // Put a checkpoint before the execute action so that rollback happens
+        // if execute fails.
+        hr = PlanExecuteCheckpoint(pPlan);
+        ExitOnFailure(hr, "Failed to plan dependency checkpoint action.");
+    }
+
+    // Add the execute plan. This comes after rollback so if something goes wrong
+    // rollback will try to clean up after us correctly.
+    if (BURN_DEPENDENCY_ACTION_NONE != dependencyExecuteAction)
+    {
+        if (NULL != pdwInsertSequence)
+        {
+            hr = PlanInsertExecuteAction(*pdwInsertSequence, pPlan, &pAction);
+            ExitOnFailure(hr, "Failed to insert execute action.");
+
+            // Always move the sequence after this dependency action so the dependency registration
+            // stays in front of the inserted actions.
+            ++(*pdwInsertSequence);
+        }
+        else
+        {
+            hr = PlanAppendExecuteAction(pPlan, &pAction);
+            ExitOnFailure(hr, "Failed to append execute action.");
+        }
+
+        pAction->type = BURN_EXECUTE_ACTION_TYPE_PACKAGE_DEPENDENCY;
+        pAction->packageDependency.pPackage = const_cast<BURN_PACKAGE*>(pPackage);
+        pAction->packageDependency.action = dependencyExecuteAction;
+
+        hr = StrAllocString(&pAction->packageDependency.sczBundleProviderKey, pPlan->wzBundleProviderKey, 0);
+        ExitOnFailure(hr, "Failed to copy the bundle dependency provider.");
+    }
+
+LExit:
+    return hr;
+}
+
+static HRESULT RegisterPackageProvider(
+    __in const BURN_PACKAGE* pPackage
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR wzId = NULL;
+    HKEY hkRoot = pPackage->fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    if (pPackage->rgDependencyProviders)
+    {
+        if (BURN_PACKAGE_TYPE_MSI == pPackage->type)
+        {
+            wzId = pPackage->Msi.sczProductCode;
+        }
+        else if (BURN_PACKAGE_TYPE_MSP == pPackage->type)
+        {
+            wzId = pPackage->Msp.sczPatchCode;
+        }
+
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+            if (!pProvider->fImported)
+            {
+                LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_REGISTER, pProvider->sczKey, pProvider->sczVersion, pPackage->sczId);
+
+                hr = DepRegisterDependency(hkRoot, pProvider->sczKey, pProvider->sczVersion, pProvider->sczDisplayName, wzId, 0);
+                ExitOnFailure(hr, "Failed to register the package dependency provider: %ls", pProvider->sczKey);
+            }
+        }
+    }
+
+LExit:
+    if (!pPackage->fVital)
+    {
+        hr = S_OK;
+    }
+
+    return hr;
+}
+
+/********************************************************************
+ UnregisterPackageProvider - Removes each dependency provider
+  for the package (if not imported from the package itself).
+
+ Note: Does not check for existing dependents before removing the key.
+*********************************************************************/
+static void UnregisterPackageProvider(
+    __in const BURN_PACKAGE* pPackage
+    )
+{
+    HRESULT hr = S_OK;
+    HKEY hkRoot = pPackage->fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    if (pPackage->rgDependencyProviders)
+    {
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+            if (!pProvider->fImported)
+            {
+                hr = DepUnregisterDependency(hkRoot, pProvider->sczKey);
+                if (SUCCEEDED(hr))
+                {
+                    LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_UNREGISTERED, pProvider->sczKey, pPackage->sczId);
+                }
+                else if (FAILED(hr) && E_FILENOTFOUND != hr)
+                {
+                    LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_UNREGISTERED_FAILED, pProvider->sczKey, pPackage->sczId, hr);
+                }
+            }
+        }
+    }
+}
+
+/********************************************************************
+ RegisterPackageDependency - Registers the provider key
+  as a dependent of a package.
+
+*********************************************************************/
+static HRESULT RegisterPackageDependency(
+    __in BOOL fPerMachine,
+    __in const BURN_PACKAGE* pPackage,
+    __in_z LPCWSTR wzDependentProviderKey
+    )
+{
+    HRESULT hr = S_OK;
+    HKEY hkRoot = fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    // Do not register a dependency on a package in a different install context.
+    if (fPerMachine != pPackage->fPerMachine)
+    {
+        LogId(REPORT_STANDARD, MSG_DEPENDENCY_PACKAGE_SKIP_WRONGSCOPE, pPackage->sczId, LoggingPerMachineToString(fPerMachine), LoggingPerMachineToString(pPackage->fPerMachine));
+        ExitFunction1(hr = S_OK);
+    }
+
+    if (pPackage->rgDependencyProviders)
+    {
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+            LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_REGISTER_DEPENDENCY, wzDependentProviderKey, pProvider->sczKey, pPackage->sczId);
+
+            hr = DepRegisterDependent(hkRoot, pProvider->sczKey, wzDependentProviderKey, NULL, NULL, 0);
+            if (E_FILENOTFOUND != hr || pPackage->fVital)
+            {
+                ExitOnFailure(hr, "Failed to register the dependency on package dependency provider: %ls", pProvider->sczKey);
+            }
+            else
+            {
+                LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_SKIP_MISSING, pProvider->sczKey, pPackage->sczId);
+                hr = S_OK;
+            }
+        }
+    }
+
+LExit:
+    return hr;
+}
+
+/********************************************************************
+ UnregisterPackageDependency - Unregisters the provider key
+  as a dependent of a package.
+
+*********************************************************************/
+static void UnregisterPackageDependency(
+    __in BOOL fPerMachine,
+    __in const BURN_PACKAGE* pPackage,
+    __in_z LPCWSTR wzDependentProviderKey
+    )
+{
+    HRESULT hr = S_OK;
+    HKEY hkRoot = fPerMachine ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
+
+    // Should be no registration to remove since we don't write keys across contexts.
+    if (fPerMachine != pPackage->fPerMachine)
+    {
+        LogId(REPORT_STANDARD, MSG_DEPENDENCY_PACKAGE_SKIP_WRONGSCOPE, pPackage->sczId, LoggingPerMachineToString(fPerMachine), LoggingPerMachineToString(pPackage->fPerMachine));
+        return;
+    }
+
+    // Loop through each package provider and remove the bundle dependency key.
+    if (pPackage->rgDependencyProviders)
+    {
+        for (DWORD i = 0; i < pPackage->cDependencyProviders; ++i)
+        {
+            const BURN_DEPENDENCY_PROVIDER* pProvider = &pPackage->rgDependencyProviders[i];
+
+            hr = DepUnregisterDependent(hkRoot, pProvider->sczKey, wzDependentProviderKey);
+            if (SUCCEEDED(hr))
+            {
+                LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_UNREGISTERED_DEPENDENCY, wzDependentProviderKey, pProvider->sczKey, pPackage->sczId);
+            }
+            else if (FAILED(hr) && E_FILENOTFOUND != hr)
+            {
+                LogId(REPORT_VERBOSE, MSG_DEPENDENCY_PACKAGE_UNREGISTERED_DEPENDENCY_FAILED, wzDependentProviderKey, pProvider->sczKey, pPackage->sczId, hr);
+            }
+        }
+    }
+}
+
+/********************************************************************
+ PackageProviderExists - Checks if a package provider is registered.
+
+*********************************************************************/
+static BOOL PackageProviderExists(
+    __in const BURN_PACKAGE* pPackage
+    )
+{
+    HRESULT hr = DependencyDetectProviderKeyPackageId(pPackage, NULL, NULL);
+    return SUCCEEDED(hr);
+}