package daemon: Add support for activation change request

* daemon: Handle new request B_MESSAGE_COMMIT_TRANSACTION. It activates
  and deactivates given sets of packages. The new packages must be
  placed in a directory in the administrative directory. The daemon
  moves them to the packages directory and the deactivated packages to
  a subdirectory it creates. It also save the old activation state
  there.
* Add private BActivationTransaction, describing an activation change
  transaction.
* BDaemonClient: Add CommitTransaction(), which sends a given
  BActivationTransaction as a B_MESSAGE_COMMIT_TRANSACTION request to
  the daemon.

Completely untested yet.

headers/build/private/package/ActivationTransaction.h

@@ -0,0 +1 @@
+#include <../private/package/ActivationTransaction.h>

headers/private/package/ActivationTransaction.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold <ingo_weinhold@gmx.de>
+ */
+#ifndef _PACKAGE__PRIVATE__ACTIVATION_TRANSACTION_H_
+#define _PACKAGE__PRIVATE__ACTIVATION_TRANSACTION_H_
+
+
+#include <package/PackageDefs.h>
+#include <StringList.h>
+
+
+namespace BPackageKit {
+namespace BPrivate {
+
+
+class BActivationTransaction {
+public:
+								BActivationTransaction();
+								BActivationTransaction(
+									BPackageInstallationLocation location,
+									int64 changeCount,
+									const BString& directoryName,
+									const BStringList& packagesToActivate,
+									const BStringList& packagesToDeactivate);
+								~BActivationTransaction();
+
+			status_t			InitCheck() const;
+			status_t			SetTo(BPackageInstallationLocation location,
+									int64 changeCount,
+									const BString& directoryName,
+									const BStringList& packagesToActivate,
+									const BStringList& packagesToDeactivate);
+
+			BPackageInstallationLocation Location() const;
+			void				SetLocation(
+									BPackageInstallationLocation location);
+
+			int64				ChangeCount() const;
+			void				SetChangeCount(int64 changeCount);
+
+			const BString&		TransactionDirectoryName() const;
+			void				SetTransactionDirectoryName(
+									const BString& directoryName);
+
+			const BStringList&	PackagesToActivate() const;
+			void				SetPackagesToActivate(
+									const BStringList& packages);
+
+			const BStringList&	PackagesToDeactivate() const;
+			void				SetPackagesToDeactivate(
+									const BStringList& packages);
+
+private:
+			BPackageInstallationLocation fLocation;
+			int64				fChangeCount;
+			BString				fTransactionDirectoryName;
+			BStringList			fPackagesToActivate;
+			BStringList			fPackagesToDeactivate;
+};
+
+
+}	// namespace BPrivate
+}	// namespace BPackageKit
+
+
+#endif	// _PACKAGE__PRIVATE__ACTIVATION_TRANSACTION_H_

headers/private/package/DaemonClient.h

@@ -11,6 +11,9 @@
 
 #include <Messenger.h>
 #include <package/PackageDefs.h>
+#include <String.h>
+
+#include <package/DaemonDefs.h>
 
 
 namespace BPackageKit {
@@ -23,7 +26,13 @@ class BPackageInfoSet;
 namespace BPrivate {
 
 
+class BActivationTransaction;
+
+
 class BDaemonClient {
+public:
+			class BCommitTransactionResult;
+
 public:
 								BDaemonClient();
 								~BDaemonClient();
@@ -31,17 +40,57 @@ public:
 			status_t			GetInstallationLocationInfo(
 									BPackageInstallationLocation location,
 									BInstallationLocationInfo& _info);
+			status_t			CommitTransaction(
+									const BActivationTransaction& transaction,
+									BCommitTransactionResult& _result);
 
 private:
 			status_t			_InitMessenger();
 			status_t			_ExtractPackageInfoSet(const BMessage& message,
 									const char* field, BPackageInfoSet& _infos);
 
+			status_t			_CommitTransaction(
+									const BActivationTransaction& transaction,
+									BCommitTransactionResult& _result);
+
 private:
 			BMessenger			fDaemonMessenger;
 };
 
 
+class BDaemonClient::BCommitTransactionResult {
+public:
+								BCommitTransactionResult();
+								BCommitTransactionResult(int32 error,
+									const BString& errorMessage,
+									const BString& errorPackage,
+									const BString& oldStateDirectory);
+								~BCommitTransactionResult();
+
+			void				SetTo(int32 error, const BString& errorMessage,
+									const BString& errorPackage,
+									const BString& oldStateDirectory);
+
+			status_t			Error() const;
+			BDaemonError		DaemonError() const;
+									// may be B_DAEMON_OK, even if Error() is
+									// != B_OK, then Error() is as specific as
+									// is known
+			const BString&		ErrorMessage() const;
+									// may be empty, even on error
+			const BString&		ErrorPackage() const;
+									// may be empty, even on error
+
+			const BString&		OldStateDirectory() const;
+
+private:
+			int32				fError;
+			BString				fErrorMessage;
+			BString				fErrorPackage;
+			BString				fOldStateDirectory;
+};
+
+
 }	// namespace BPrivate
 }	// namespace BPackageKit
 

headers/private/package/DaemonDefs.h

@@ -17,7 +17,11 @@ namespace BPrivate {
 
 
 enum BDaemonError {
-	B_DAEMON_OK
+	B_DAEMON_OK = 0,
+	B_DAEMON_CHANGE_COUNT_MISMATCH,
+	B_DAEMON_BAD_REQUEST,
+	B_DAEMON_NO_SUCH_PACKAGE,
+	B_DAEMON_PACKAGE_ALREADY_EXISTS
 };
 
 
@@ -36,11 +40,40 @@ enum {
 		//		archived BPackageInfos of the active packages
 		// "inactive packages": message[]
 		//		archived BPackageInfos of the inactive packages
+
+	B_MESSAGE_COMMIT_TRANSACTION		= 'PKTC',
+		// "location": int32
+		//		the respective installation location constant
+		// "change count": int64
+		//		the expected change count of the installation location; fail,
+		//		if something has changed in the meantime
+		// "transaction": string
+		//		name of the transaction directory (subdirectory of the
+		//		administrative directory) where to-be-activated packages live
+		// "activate": string[]
+		//		file names of the packages to activate; must be in the
+		//		transaction directory
+		// "deactivate": string[]
+		//		file names of the packages to activate; must be in the
+		//		transaction directory
+	B_MESSAGE_COMMIT_TRANSACTION_REPLY	= 'PKTR'
+		// "error": int32
+		//		regular error code or BDaemonError describing how committing
+		//		the transaction went
+		// "error message": string
+		//		[error case only] gives some additional information what went
+		//		wrong; optional
+		// "error package": string
+		//		[error case only] file name of the package causing the error,
+		//		if any in particarly; optional
+		// "old state": string
+		//		name of the directory (subdirectory of the administrative
+		//		directory) containing the deactivated packages
 };
 
 
-#endif	// _PACKAGE__PRIVATE__DAEMON_DEFS_H_
-
-
 }	// namespace BPrivate
 }	// namespace BPackageKit
+
+
+#endif	// _PACKAGE__PRIVATE__DAEMON_DEFS_H_

src/build/libpackage/Jamfile

@@ -67,6 +67,7 @@ BuildPlatformSharedLibrary libpackage_build.so
 	:
 	ActivateRepositoryCacheJob.cpp
 	ActivateRepositoryConfigJob.cpp
+	ActivationTransaction.cpp
 	AddRepositoryRequest.cpp
 	Attributes.cpp
 	BlockBufferCacheNoLock.cpp

src/kits/package/ActivationTransaction.cpp

@@ -0,0 +1,158 @@
+/*
+ * Copyright 2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Ingo Weinhold <ingo_weinhold@gmx.de>
+ */
+
+
+#include <package/ActivationTransaction.h>
+
+
+namespace BPackageKit {
+namespace BPrivate {
+
+
+BActivationTransaction::BActivationTransaction()
+	:
+	fLocation(B_PACKAGE_INSTALLATION_LOCATION_ENUM_COUNT),
+	fChangeCount(0),
+	fTransactionDirectoryName(),
+	fPackagesToActivate(),
+	fPackagesToDeactivate()
+{
+}
+
+
+BActivationTransaction::BActivationTransaction(
+	BPackageInstallationLocation location, int64 changeCount,
+	const BString& directoryName, const BStringList& packagesToActivate,
+	const BStringList& packagesToDeactivate)
+	:
+	fLocation(location),
+	fChangeCount(changeCount),
+	fTransactionDirectoryName(directoryName),
+	fPackagesToActivate(packagesToActivate),
+	fPackagesToDeactivate(packagesToDeactivate)
+{
+}
+
+
+BActivationTransaction::~BActivationTransaction()
+{
+}
+
+
+status_t
+BActivationTransaction::InitCheck() const
+{
+	if (fLocation < 0 || fLocation >= B_PACKAGE_INSTALLATION_LOCATION_ENUM_COUNT
+		|| fTransactionDirectoryName.IsEmpty()
+		|| (fPackagesToActivate.IsEmpty() && fPackagesToDeactivate.IsEmpty())) {
+		return B_BAD_VALUE;
+	}
+	return B_OK;
+}
+
+status_t
+BActivationTransaction::SetTo(BPackageInstallationLocation location,
+	int64 changeCount, const BString& directoryName,
+	const BStringList& packagesToActivate,
+	const BStringList& packagesToDeactivate)
+{
+	if (location < 0 || location >= B_PACKAGE_INSTALLATION_LOCATION_ENUM_COUNT
+		|| directoryName.IsEmpty()
+		|| (packagesToActivate.IsEmpty() && packagesToDeactivate.IsEmpty())) {
+		return B_BAD_VALUE;
+	}
+
+	fLocation = location;
+	fChangeCount = changeCount;
+	fTransactionDirectoryName = directoryName;
+	fPackagesToActivate = packagesToActivate;
+	fPackagesToDeactivate = packagesToDeactivate;
+
+	if (fPackagesToActivate.CountStrings() != packagesToActivate.CountStrings()
+		|| fPackagesToDeactivate.CountStrings()
+			!= packagesToDeactivate.CountStrings()) {
+		return B_NO_MEMORY;
+	}
+
+	return B_OK;
+}
+
+
+BPackageInstallationLocation
+BActivationTransaction::Location() const
+{
+	return fLocation;
+}
+
+
+void
+BActivationTransaction::SetLocation(BPackageInstallationLocation location)
+{
+	fLocation = location;
+}
+
+
+int64
+BActivationTransaction::ChangeCount() const
+{
+	return fChangeCount;
+}
+
+
+void
+BActivationTransaction::SetChangeCount(int64 changeCount)
+{
+	fChangeCount = changeCount;
+}
+
+
+const BString&
+BActivationTransaction::TransactionDirectoryName() const
+{
+	return fTransactionDirectoryName;
+}
+
+
+void
+BActivationTransaction::SetTransactionDirectoryName(
+	const BString& directoryName)
+{
+	fTransactionDirectoryName = directoryName;
+}
+
+
+const BStringList&
+BActivationTransaction::PackagesToActivate() const
+{
+	return fPackagesToActivate;
+}
+
+
+void
+BActivationTransaction::SetPackagesToActivate(const BStringList& packages)
+{
+	fPackagesToActivate = packages;
+}
+
+
+const BStringList&
+BActivationTransaction::PackagesToDeactivate() const
+{
+	return fPackagesToDeactivate;
+}
+
+
+void
+BActivationTransaction::SetPackagesToDeactivate(const BStringList& packages)
+{
+	fPackagesToDeactivate = packages;
+}
+
+
+}	// namespace BPrivate
+}	// namespace BPackageKit

src/kits/package/DaemonClient.cpp

@@ -12,13 +12,16 @@
 #include <package/InstallationLocationInfo.h>
 #include <package/PackageInfo.h>
 
-#include <package/DaemonDefs.h>
+#include <package/ActivationTransaction.h>
 
 
 namespace BPackageKit {
 namespace BPrivate {
 
 
+// #pragma mark - BCommitTransactionResult
+
+
 BDaemonClient::BDaemonClient()
 	:
 	fDaemonMessenger()
@@ -87,6 +90,19 @@ BDaemonClient::GetInstallationLocationInfo(
 }
 
 
+status_t
+BDaemonClient::CommitTransaction(const BActivationTransaction& transaction,
+	BCommitTransactionResult& _result)
+{
+	status_t error = _CommitTransaction(transaction, _result);
+		// B_OK just indicates that _result has been initialized.
+	if (error != B_OK)
+		_result.SetTo(error, BString(), BString(), BString());
+
+	return _result.Error();
+}
+
+
 status_t
 BDaemonClient::_InitMessenger()
 {
@@ -133,5 +149,136 @@ BDaemonClient::_ExtractPackageInfoSet(const BMessage& message,
 }
 
 
+status_t
+BDaemonClient::_CommitTransaction(const BActivationTransaction& transaction,
+	BCommitTransactionResult& _result)
+{
+	if (transaction.InitCheck() != B_OK)
+		return B_BAD_VALUE;
+
+	status_t error = _InitMessenger();
+	if (error != B_OK)
+		return error;
+
+	// send the request
+	BMessage request(B_MESSAGE_COMMIT_TRANSACTION);
+	if ((error = request.AddInt32("location", transaction.Location())) != B_OK
+		|| (error = request.AddInt64("change count",
+			transaction.ChangeCount())) != B_OK
+		|| (error = request.AddString("transaction",
+			transaction.TransactionDirectoryName())) != B_OK
+		|| (error = request.AddStrings("activate",
+			transaction.PackagesToActivate())) != B_OK
+		|| (error = request.AddStrings("deactivate",
+			transaction.PackagesToDeactivate())) != B_OK) {
+		return error;
+	}
+
+	BMessage reply;
+	fDaemonMessenger.SendMessage(&request, &reply);
+	if (reply.what != B_MESSAGE_COMMIT_TRANSACTION_REPLY)
+		return B_ERROR;
+
+	// extract the result
+	int32 requestError;
+	error = reply.FindInt32("error", &requestError);
+	if (error != B_OK)
+		return error;
+
+	BString errorMessage;
+	BString errorPackage;
+	BString oldStateDirectory;
+	if (requestError == 0) {
+		error = reply.FindString("old state", &oldStateDirectory);
+		if (error != B_OK)
+			return error;
+	} else {
+		reply.FindString("error message", &errorMessage);
+		reply.FindString("error package", &errorPackage);
+	}
+
+	_result.SetTo(requestError, errorMessage, errorPackage, oldStateDirectory);
+	return B_OK;
+		// Even on error. B_OK just indicates that we have initialized _result.
+}
+
+
+// #pragma mark - BCommitTransactionResult
+
+
+BDaemonClient::BCommitTransactionResult::BCommitTransactionResult()
+	:
+	fError(B_NO_INIT),
+	fErrorMessage(),
+	fErrorPackage(),
+	fOldStateDirectory()
+{
+}
+
+
+BDaemonClient::BCommitTransactionResult::BCommitTransactionResult(int32 error,
+	const BString& errorMessage, const BString& errorPackage,
+	const BString& oldStateDirectory)
+	:
+	fError(error),
+	fErrorMessage(errorMessage),
+	fErrorPackage(errorPackage),
+	fOldStateDirectory(oldStateDirectory)
+{
+}
+
+
+BDaemonClient::BCommitTransactionResult::~BCommitTransactionResult()
+{
+}
+
+
+void
+BDaemonClient::BCommitTransactionResult::SetTo(int32 error,
+	const BString& errorMessage, const BString& errorPackage,
+	const BString& oldStateDirectory)
+{
+	fError = error;
+	fErrorMessage = errorMessage;
+	fErrorPackage = errorPackage;
+	fOldStateDirectory = oldStateDirectory;
+}
+
+
+status_t
+BDaemonClient::BCommitTransactionResult::Error() const
+{
+	return fError <= 0 ? fError : B_ERROR;
+}
+
+
+BDaemonError
+BDaemonClient::BCommitTransactionResult::DaemonError() const
+{
+	return fError > 0 ? (BDaemonError)fError : B_DAEMON_OK;
+}
+
+
+const BString&
+BDaemonClient::BCommitTransactionResult::ErrorMessage() const
+{
+	return fErrorMessage;
+}
+
+
+const BString&
+BDaemonClient::BCommitTransactionResult::ErrorPackage() const
+{
+	return fErrorPackage;
+}
+
+
+const BString&
+BDaemonClient::BCommitTransactionResult::OldStateDirectory() const
+{
+	return fOldStateDirectory;
+}
+
+
 }	// namespace BPrivate
 }	// namespace BPackageKit

src/kits/package/Jamfile

@@ -46,6 +46,7 @@ SharedLibrary libpackage.so
 	:
 	ActivateRepositoryCacheJob.cpp
 	ActivateRepositoryConfigJob.cpp
+	ActivationTransaction.cpp
 	AddRepositoryRequest.cpp
 	Attributes.cpp
 	BlockBufferCacheNoLock.cpp

src/servers/package/Package.cpp

@@ -25,7 +25,9 @@ Package::Package()
 	fInfo(),
 	fActive(false),
 	fFileNameHashTableNext(NULL),
-	fNodeRefHashTableNext(NULL)
+	fNodeRefHashTableNext(NULL),
+	fIgnoreEntryCreated(0),
+	fIgnoreEntryRemoved(0)
 {
 }
 

src/servers/package/Package.h

@@ -39,6 +39,20 @@ public:
 			void				SetActive(bool active)
 									{ fActive = active; }
 
+			int32				EntryCreatedIgnoreLevel() const
+									{ return fIgnoreEntryCreated; }
+			void				IncrementEntryCreatedIgnoreLevel()
+									{ fIgnoreEntryCreated++; }
+			void				DecrementEntryCreatedIgnoreLevel()
+									{ fIgnoreEntryCreated--; }
+
+			int32				EntryRemovedIgnoreLevel() const
+									{ return fIgnoreEntryRemoved; }
+			void				IncrementEntryRemovedIgnoreLevel()
+									{ fIgnoreEntryRemoved++; }
+			void				DecrementEntryRemovedIgnoreLevel()
+									{ fIgnoreEntryRemoved--; }
+
 			Package*&			FileNameHashTableNext()
 									{ return fFileNameHashTableNext; }
 			Package*&			NodeRefHashTableNext()
@@ -51,6 +65,8 @@ private:
 			bool				fActive;
 			Package*			fFileNameHashTableNext;
 			Package*			fNodeRefHashTableNext;
+			int32				fIgnoreEntryCreated;
+			int32				fIgnoreEntryRemoved;
 };
 
 

src/servers/package/PackageDaemon.cpp

@@ -86,11 +86,10 @@ PackageDaemon::MessageReceived(BMessage* message)
 		}
 
 		case B_MESSAGE_GET_INSTALLATION_LOCATION_INFO:
+		case B_MESSAGE_COMMIT_TRANSACTION:
 		{
-			if (fSystemRoot == NULL)
-				break;
-
-			fSystemRoot->HandleGetLocationInfoRequest(DetachCurrentMessage());
+			if (fSystemRoot != NULL)
+				fSystemRoot->HandleRequest(DetachCurrentMessage());
 			break;
 		}
 

src/servers/package/Root.cpp

@@ -17,9 +17,14 @@
 #include <AutoDeleter.h>
 #include <AutoLocker.h>
 
+#include <package/DaemonDefs.h>
+
 #include "DebugSupport.h"
 
 
+using namespace BPackageKit::BPrivate;
+
+
 // #pragma mark - VolumeJob
 
 
@@ -42,11 +47,11 @@ private:
 };
 
 
-// #pragma mark - HandleGetLocationInfoRequestJob
+// #pragma mark - RequestJob
 
 
-struct Root::HandleGetLocationInfoRequestJob : public Job {
-	HandleGetLocationInfoRequestJob(Root* root, BMessage* message)
+struct Root::RequestJob : public Job {
+	RequestJob(Root* root, BMessage* message)
 		:
 		fRoot(root),
 		fMessage(message)
@@ -55,7 +60,7 @@ struct Root::HandleGetLocationInfoRequestJob : public Job {
 
 	virtual void Do()
 	{
-		fRoot->_HandleGetLocationInfoRequest(fMessage.Get());
+		fRoot->_HandleRequest(fMessage.Get());
 	}
 
 private:
@@ -209,10 +214,9 @@ Root::FindVolume(dev_t deviceID) const
 
 
 void
-Root::HandleGetLocationInfoRequest(BMessage* message)
+Root::HandleRequest(BMessage* message)
 {
-	HandleGetLocationInfoRequestJob* job
-		= new(std::nothrow) HandleGetLocationInfoRequestJob(this, message);
+	RequestJob* job = new(std::nothrow) RequestJob(this, message);
 	if (job == NULL) {
 		delete message;
 		return;
@@ -253,6 +257,22 @@ Root::_GetVolume(PackageFSMountType mountType)
 }
 
 
+Volume*
+Root::_GetVolume(BPackageInstallationLocation location)
+{
+	switch ((BPackageInstallationLocation)location) {
+		case B_PACKAGE_INSTALLATION_LOCATION_SYSTEM:
+			return fSystemVolume;
+		case B_PACKAGE_INSTALLATION_LOCATION_COMMON:
+			return fCommonVolume;
+		case B_PACKAGE_INSTALLATION_LOCATION_HOME:
+			return fHomeVolume;
+		default:
+			return NULL;
+	}
+}
+
+
 Volume*
 Root::_NextVolumeFor(Volume* volume)
 {
@@ -314,7 +334,7 @@ Root::_ProcessNodeMonitorEvents(Volume* volume)
 
 
 void
-Root::_HandleGetLocationInfoRequest(BMessage* message)
+Root::_HandleRequest(BMessage* message)
 {
 	int32 location;
 	if (message->FindInt32("location", &location) != B_OK
@@ -325,23 +345,19 @@ Root::_HandleGetLocationInfoRequest(BMessage* message)
 
 	// get the volume and let it handle the message
 	AutoLocker<BLocker> locker(fLock);
-	Volume* volume;
-	switch ((BPackageInstallationLocation)location) {
-		case B_PACKAGE_INSTALLATION_LOCATION_SYSTEM:
-			volume = fSystemVolume;
-			break;
-		case B_PACKAGE_INSTALLATION_LOCATION_COMMON:
-			volume = fCommonVolume;
-			break;
-		case B_PACKAGE_INSTALLATION_LOCATION_HOME:
-			volume = fHomeVolume;
-			break;
-		default:
-			return;
-	}
+	Volume* volume = _GetVolume((BPackageInstallationLocation)location);
+	locker.Unlock();
 
-	if (volume != NULL)
-		volume->HandleGetLocationInfoRequest(message);
+	if (volume != NULL) {
+		switch (message->what) {
+			case B_MESSAGE_GET_INSTALLATION_LOCATION_INFO:
+				volume->HandleGetLocationInfoRequest(message);
+				break;
+			case B_MESSAGE_COMMIT_TRANSACTION:
+				volume->HandleCommitTransactionRequest(message);
+				break;
+		}
+	}
 }
 
 

src/servers/package/Root.h

@@ -13,6 +13,7 @@
 #include <Node.h>
 #include <ObjectList.h>
 #include <OS.h>
+#include <package/PackageDefs.h>
 #include <String.h>
 
 #include <Referenceable.h>
@@ -41,7 +42,7 @@ public:
 
 			Volume*				FindVolume(dev_t deviceID) const;
 
-			void				HandleGetLocationInfoRequest(BMessage* message);
+			void				HandleRequest(BMessage* message);
 
 private:
 	// Volume::Listener
@@ -52,19 +53,20 @@ protected:
 
 private:
 			struct VolumeJob;
-			struct HandleGetLocationInfoRequestJob;
+			struct RequestJob;
 
-			friend struct HandleGetLocationInfoRequestJob;
+			friend struct RequestJob;
 
 private:
 			Volume**			_GetVolume(PackageFSMountType mountType);
+			Volume*				_GetVolume(
+									BPackageInstallationLocation location);
 			Volume*				_NextVolumeFor(Volume* volume);
 
 			void				_InitPackages(Volume* volume);
 			void				_DeleteVolume(Volume* volume);
 			void				_ProcessNodeMonitorEvents(Volume* volume);
-			void				_HandleGetLocationInfoRequest(
-									BMessage* message);
+			void				_HandleRequest(BMessage* message);
 
 			status_t			_QueueJob(Job* job);
 

src/servers/package/Volume.h

@@ -50,6 +50,8 @@ public:
 			void				InitialVerify(Volume* nextVolume,
 									Volume* nextNextVolume);
 			void				HandleGetLocationInfoRequest(BMessage* message);
+			void				HandleCommitTransactionRequest(
+									BMessage* message);
 
 			void				Unmounted();
 
@@ -88,8 +90,13 @@ public:
 
 private:
 			struct NodeMonitorEvent;
-			typedef DoublyLinkedList<NodeMonitorEvent> NodeMonitorEventList;
+			struct RelativePath;
+			struct Exception;
+			struct CommitTransactionHandler;
 
+			friend struct CommitTransactionHandler;
+
+			typedef DoublyLinkedList<NodeMonitorEvent> NodeMonitorEventList;
 			typedef std::set<Package*> PackageSet;
 
 private:
@@ -117,11 +124,34 @@ private:
 									BSolverRepository& repository,
 							 		bool activeOnly, bool installed);
 
-			status_t			_OpenPackagesFile(const char* subDirectoryPath,
+			status_t			_OpenPackagesFile(
+									const RelativePath& subDirectoryPath,
 									const char* fileName, uint32 openMode,
 									BFile& _file, BEntry* _entry = NULL);
-			status_t			_OpenPackagesSubDirectory(const char* path,
-									bool create, BDirectory& _directory);
+			status_t			_OpenPackagesSubDirectory(
+									const RelativePath& path, bool create,
+									BDirectory& _directory);
+
+			status_t			_CreateActivationFileContent(
+									const PackageSet& toActivate,
+									const PackageSet& toDeactivate,
+									BString& _content);
+			status_t			_WriteActivationFile(
+									const RelativePath& directoryPath,
+									const char* fileName,
+									const PackageSet& toActivate,
+									const PackageSet& toDeactivate,
+									BEntry& _entry);
+
+			status_t			_WriteTextFile(
+									const RelativePath& directoryPath,
+									const char* fileName,
+									const BString& content, BEntry& _entry);
+
+			void				_ChangePackageActivation(
+									const PackageSet& packagesToActivate,
+									const PackageSet& packagesToDeactivate);
+									// throws Exception
 
 private:
 			BString				fPath;