TaskTree: Use common done handler

Instead of specifying two separate done and error handlers, specify just one that takes additional "bool success" argument. Task-number: QTCREATORBUG-29834 Change-Id: Ie4f92236a38b03dac3dd33b2c80a317b62772a12 Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
2023-11-02 16:14:50 +01:00
parent 0e7ecee489
commit 0fa16f8489
21 changed files with 209 additions and 217 deletions
--- a/src/libs/utils/filestreamer.cpp
+++ b/src/libs/utils/filestreamer.cpp
@@ -252,7 +252,7 @@ signals:

 private:
    GroupItem remoteTask() final {
-        const auto setup = [this](Process &process) {
+        const auto onSetup = [this](Process &process) {
            m_writeBuffer = new WriteBuffer(false, &process);
            connect(m_writeBuffer, &WriteBuffer::writeRequested, &process, &Process::writeRaw);
            connect(m_writeBuffer, &WriteBuffer::closeWriteChannelRequested,
@@ -266,23 +266,23 @@ private:
                process.setWriteData(m_writeData);
            connect(&process, &Process::started, this, [this] { emit started(); });
        };
-        const auto finalize = [this](const Process &) {
+        const auto onDone = [this](const Process &, bool) {
            delete m_writeBuffer;
            m_writeBuffer = nullptr;
        };
-        return ProcessTask(setup, finalize, finalize);
+        return ProcessTask(onSetup, onDone);
    }
    GroupItem localTask() final {
-        const auto setup = [this](Async<void> &async) {
+        const auto onSetup = [this](Async<void> &async) {
            m_writeBuffer = new WriteBuffer(isBuffered(), &async);
            async.setConcurrentCallData(localWrite, m_filePath, m_writeData, m_writeBuffer);
            emit started();
        };
-        const auto finalize = [this](const Async<void> &) {
+        const auto onDone = [this](const Async<void> &, bool) {
            delete m_writeBuffer;
            m_writeBuffer = nullptr;
        };
-        return AsyncTask<void>(setup, finalize, finalize);
+        return AsyncTask<void>(onSetup, onDone);
    }

    bool isBuffered() const { return m_writeData.isEmpty(); }
@@ -327,17 +327,17 @@ static Group interDeviceTransferTask(const FilePath &source, const FilePath &des
    SingleBarrier writerReadyBarrier;
    TreeStorage<TransferStorage> storage;

-    const auto setupReader = [=](FileStreamReader &reader) {
+    const auto onReaderSetup = [=](FileStreamReader &reader) {
        reader.setFilePath(source);
        QTC_CHECK(storage->writer != nullptr);
        QObject::connect(&reader, &FileStreamReader::readyRead,
                         storage->writer, &FileStreamWriter::write);
    };
-    const auto finalizeReader = [=](const FileStreamReader &) {
+    const auto onReaderDone = [=](const FileStreamReader &, bool) {
        if (storage->writer) // writer may be deleted before the reader on TaskTree::stop().
            storage->writer->closeWriteChannel();
    };
-    const auto setupWriter = [=](FileStreamWriter &writer) {
+    const auto onWriterSetup = [=](FileStreamWriter &writer) {
        writer.setFilePath(destination);
        QObject::connect(&writer, &FileStreamWriter::started,
                         writerReadyBarrier->barrier(), &Barrier::advance);
@@ -349,10 +349,10 @@ static Group interDeviceTransferTask(const FilePath &source, const FilePath &des
        Storage(writerReadyBarrier),
        parallel,
        Storage(storage),
-        FileStreamWriterTask(setupWriter),
+        FileStreamWriterTask(onWriterSetup),
        Group {
            waitForBarrierTask(writerReadyBarrier),
-            FileStreamReaderTask(setupReader, finalizeReader, finalizeReader)
+            FileStreamReaderTask(onReaderSetup, onReaderDone)
        }
    };

--- a/src/plugins/android/androidsdkdownloader.cpp
+++ b/src/plugins/android/androidsdkdownloader.cpp
@@ -130,10 +130,15 @@ void AndroidSdkDownloader::downloadAndExtractSdk()
 #endif
        });
    };
-    const auto onQueryDone = [this, storage](const NetworkQuery &query) {
+    const auto onQueryDone = [this, storage](const NetworkQuery &query, bool success) {
        QNetworkReply *reply = query.reply();
        QTC_ASSERT(reply, return);
        const QUrl url = reply->url();
+        if (!success) {
+            logError(Tr::tr("Downloading Android SDK Tools from URL %1 has failed: %2.")
+                         .arg(url.toString(), reply->errorString()));
+            return;
+        }
        if (isHttpRedirect(reply)) {
            logError(Tr::tr("Download from %1 was redirected.").arg(url.toString()));
            return;
@@ -146,13 +151,6 @@ void AndroidSdkDownloader::downloadAndExtractSdk()
        }
        *storage = sdkFileName;
    };
-    const auto onQueryError = [this](const NetworkQuery &query) {
-        QNetworkReply *reply = query.reply();
-        QTC_ASSERT(reply, return);
-        const QUrl url = reply->url();
-        logError(Tr::tr("Downloading Android SDK Tools from URL %1 has failed: %2.")
-                            .arg(url.toString(), reply->errorString()));
-    };

    const auto onUnarchiveSetup = [this, storage](Unarchiver &unarchiver) {
        m_progressDialog->setRange(0, 0);
@@ -173,19 +171,20 @@ void AndroidSdkDownloader::downloadAndExtractSdk()
        unarchiver.setDestDir(sdkFileName.parentDir());
        return SetupResult::Continue;
    };
-    const auto onUnarchiverDone = [this, storage](const Unarchiver &) {
+    const auto onUnarchiverDone = [this, storage](const Unarchiver &, bool success) {
+        if (!success) {
+            logError(Tr::tr("Unarchiving error."));
+            return;
+        }
        m_androidConfig.setTemporarySdkToolsPath(
            (*storage)->parentDir().pathAppended(Constants::cmdlineToolsName));
        QMetaObject::invokeMethod(this, [this] { emit sdkExtracted(); }, Qt::QueuedConnection);
    };
-    const auto onUnarchiverError = [this](const Unarchiver &) {
-        logError(Tr::tr("Unarchiving error."));
-    };

    const Group root {
        Tasking::Storage(storage),
-        NetworkQueryTask(onQuerySetup, onQueryDone, onQueryError),
-        UnarchiverTask(onUnarchiveSetup, onUnarchiverDone, onUnarchiverError)
+        NetworkQueryTask(onQuerySetup, onQueryDone),
+        UnarchiverTask(onUnarchiveSetup, onUnarchiverDone)
    };

    m_taskTree.reset(new TaskTree(root));
--- a/src/plugins/autotest/testrunner.cpp
+++ b/src/plugins/autotest/testrunner.cpp
@@ -410,7 +410,7 @@ void TestRunner::runTestsHelper()
            qCInfo(runnerLog) << "Working directory:" << process.workingDirectory();
            qCDebug(runnerLog) << "Environment:" << process.environment().toStringList();
        };
-        const auto onProcessDone = [this, config, storage](const Process &process) {
+        const auto onProcessDone = [this, config, storage](const Process &process, bool) {
            TestStorage *testStorage = storage.activeStorage();
            QTC_ASSERT(testStorage, return);
            if (process.result() == ProcessResult::StartFailed) {
@@ -448,7 +448,7 @@ void TestRunner::runTestsHelper()
            finishAllAndDone,
            Tasking::Storage(storage),
            onGroupSetup(onSetup),
-            ProcessTask(onProcessSetup, onProcessDone, onProcessDone)
+            ProcessTask(onProcessSetup, onProcessDone)
        };
        tasks.append(group);
    }
--- a/src/plugins/boot2qt/qdbmakedefaultappstep.cpp
+++ b/src/plugins/boot2qt/qdbmakedefaultappstep.cpp
@@ -38,7 +38,7 @@ public:
 private:
    GroupItem deployRecipe() final
    {
-        const auto setupHandler = [this](Process &process) {
+        const auto onSetup = [this](Process &process) {
            QString remoteExe;
            if (RunConfiguration *rc = target()->activeRunConfiguration()) {
                if (auto exeAspect = rc->aspect<ExecutableAspect>())
@@ -55,16 +55,15 @@ private:
                handleStdErrData(proc->readAllStandardError());
            });
        };
-        const auto doneHandler = [this](const Process &) {
-            if (selection() == 0)
+        const auto onDone = [this](const Process &process, bool success) {
+            if (!success)
+                addErrorMessage(Tr::tr("Remote process failed: %1").arg(process.errorString()));
+            else if (selection() == 0)
                addProgressMessage(Tr::tr("Application set as the default one."));
            else
                addProgressMessage(Tr::tr("Reset the default application."));
        };
-        const auto errorHandler = [this](const Process &process) {
-            addErrorMessage(Tr::tr("Remote process failed: %1").arg(process.errorString()));
-        };
-        return ProcessTask(setupHandler, doneHandler, errorHandler);
+        return ProcessTask(onSetup, onDone);
    }

    SelectionAspect selection{this};
--- a/src/plugins/boot2qt/qdbstopapplicationstep.cpp
+++ b/src/plugins/boot2qt/qdbstopapplicationstep.cpp
@@ -39,7 +39,7 @@ public:

 GroupItem QdbStopApplicationStep::deployRecipe()
 {
-    const auto setupHandler = [this](Process &process) {
+    const auto onSetup = [this](Process &process) {
        const auto device = DeviceKitAspect::device(target()->kit());
        if (!device) {
            addErrorMessage(Tr::tr("No device to stop the application on."));
@@ -54,10 +54,11 @@ GroupItem QdbStopApplicationStep::deployRecipe()
        });
        return SetupResult::Continue;
    };
-    const auto doneHandler = [this](const Process &) {
+    const auto onDone = [this](const Process &process, bool success) {
+        if (success) {
            addProgressMessage(Tr::tr("Stopped the running application."));
-    };
-    const auto errorHandler = [this](const Process &process) {
+            return;
+        }
        const QString errorOutput = process.cleanedStdErr();
        const QString failureMessage = Tr::tr("Could not check and possibly stop running application.");
        if (process.exitStatus() == QProcess::CrashExit) {
@@ -71,7 +72,7 @@ GroupItem QdbStopApplicationStep::deployRecipe()
            addErrorMessage(failureMessage);
        }
    };
-    return ProcessTask(setupHandler, doneHandler, errorHandler);
+    return ProcessTask(onSetup, onDone);
 }

 // QdbStopApplicationStepFactory
--- a/src/plugins/clangtools/clangtoolrunner.cpp
+++ b/src/plugins/clangtools/clangtoolrunner.cpp
@@ -163,24 +163,19 @@ GroupItem clangToolTask(const AnalyzeInputData &input,
        qCDebug(LOG).noquote() << "Starting" << commandLine.toUserOutput();
        process.setCommand(commandLine);
    };
-    const auto onProcessDone = [=](const Process &process) {
+    const auto onProcessDone = [=](const Process &process, bool success) {
        qCDebug(LOG).noquote() << "Output:\n" << process.cleanedStdOut();

-        // Here we handle only the case of process success with stderr output.
        if (!outputHandler)
            return;
-        if (process.result() != ProcessResult::FinishedWithSuccess)
-            return;
+        if (success) {
            const QString stdErr = process.cleanedStdErr();
            if (stdErr.isEmpty())
                return;
-        outputHandler(
-            {true, input.unit.file, {}, {}, input.tool, Tr::tr("%1 produced stderr output:")
-                                                            .arg(storage->name), stdErr});
-    };
-    const auto onProcessError = [=](const Process &process) {
-        if (!outputHandler)
+            outputHandler({true, input.unit.file, {}, {}, input.tool,
+                           Tr::tr("%1 produced stderr output:").arg(storage->name), stdErr});
            return;
+        }
        const QString details = Tr::tr("Command line: %1\nProcess Error: %2\nOutput:\n%3")
                                    .arg(process.commandLine().toUserOutput())
                                    .arg(process.error())
@@ -203,31 +198,24 @@ GroupItem clangToolTask(const AnalyzeInputData &input,
                                   input.diagnosticsFilter);
        data.setFutureSynchronizer(ExtensionSystem::PluginManager::futureSynchronizer());
    };
-    const auto onReadDone = [=](const Async<expected_str<Diagnostics>> &data) {
+    const auto onReadDone = [=](const Async<expected_str<Diagnostics>> &data, bool success) {
        if (!outputHandler)
            return;
        const expected_str<Diagnostics> result = data.result();
-        const bool success = result.has_value();
+        const bool ok = success && result.has_value();
        Diagnostics diagnostics;
        QString error;
-        if (success)
+        if (ok)
            diagnostics = *result;
        else
            error = result.error();
-        outputHandler({success,
+        outputHandler({ok,
                       input.unit.file,
                       storage->outputFilePath,
                       diagnostics,
                       input.tool,
                       error});
    };
-    const auto onReadError = [=](const Async<expected_str<Diagnostics>> &data) {
-        if (!outputHandler)
-            return;
-        const expected_str<Diagnostics> result = data.result();
-        outputHandler(
-            {false, input.unit.file, storage->outputFilePath, {}, input.tool, result.error()});
-    };

    const Group group {
        finishAllAndDone,
@@ -235,8 +223,8 @@ GroupItem clangToolTask(const AnalyzeInputData &input,
        onGroupSetup(onSetup),
        Group {
            sequential,
-            ProcessTask(onProcessSetup, onProcessDone, onProcessError),
-            AsyncTask<expected_str<Diagnostics>>(onReadSetup, onReadDone, onReadError)
+            ProcessTask(onProcessSetup, onProcessDone),
+            AsyncTask<expected_str<Diagnostics>>(onReadSetup, onReadDone)
        }
    };
    return group;
--- a/src/plugins/coreplugin/locator/ilocatorfilter.cpp
+++ b/src/plugins/coreplugin/locator/ilocatorfilter.cpp
@@ -441,8 +441,7 @@ void LocatorMatcher::start()
            emit serialOutputDataReady(serialOutputData);
        });
    };
-    const auto onCollectorDone = [collectorStorage](const ResultsCollector &collector) {
-        Q_UNUSED(collector)
+    const auto onCollectorDone = [collectorStorage](const ResultsCollector &, bool) {
        collectorStorage->m_collector = nullptr;
    };

@@ -480,7 +479,7 @@ void LocatorMatcher::start()
    const Group root {
        parallel,
        Storage(collectorStorage),
-        ResultsCollectorTask(onCollectorSetup, onCollectorDone, onCollectorDone),
+        ResultsCollectorTask(onCollectorSetup, onCollectorDone),
        Group {
            parallelTasks
        }
--- a/src/plugins/coreplugin/locator/javascriptfilter.cpp
+++ b/src/plugins/coreplugin/locator/javascriptfilter.cpp
@@ -394,7 +394,13 @@ LocatorMatcherTasks JavaScriptFilter::matchers()
        request.setEngine(engine);
        request.setEvaluateData(storage->input());
    };
-    const auto onJavaScriptDone = [storage](const JavaScriptRequest &request) {
+    const auto onJavaScriptDone = [storage](const JavaScriptRequest &request, bool success) {
+        if (!success) {
+            LocatorFilterEntry entry;
+            entry.displayName = request.output().m_output;
+            storage->reportOutput({entry});
+            return;
+        }
        const auto acceptor = [](const QString &clipboardContents) {
            return [clipboardContents] {
                QGuiApplication::clipboard()->setText(clipboardContents);
@@ -418,15 +424,10 @@ LocatorMatcherTasks JavaScriptFilter::matchers()

        storage->reportOutput({entry, copyResultEntry, copyExpressionEntry});
    };
-    const auto onJavaScriptError = [storage](const JavaScriptRequest &request) {
-        LocatorFilterEntry entry;
-        entry.displayName = request.output().m_output;
-        storage->reportOutput({entry});
-    };

    const Group root {
        onGroupSetup(onSetup),
-        JavaScriptRequestTask(onJavaScriptSetup, onJavaScriptDone, onJavaScriptError)
+        JavaScriptRequestTask(onJavaScriptSetup, onJavaScriptDone)
    };

    return {{root, storage}};
--- a/src/plugins/projectexplorer/abstractprocessstep.cpp
+++ b/src/plugins/projectexplorer/abstractprocessstep.cpp
@@ -164,8 +164,8 @@ GroupItem AbstractProcessStep::defaultProcessTask()
    const auto onSetup = [this](Process &process) {
        return setupProcess(process) ? SetupResult::Continue : SetupResult::StopWithError;
    };
-    const auto onEnd = [this](const Process &process) { handleProcessDone(process); };
-    return ProcessTask(onSetup, onEnd, onEnd);
+    const auto onDone = [this](const Process &process, bool) { handleProcessDone(process); };
+    return ProcessTask(onSetup, onDone);
 }

 bool AbstractProcessStep::setupProcess(Process &process)
--- a/src/plugins/projectexplorer/copystep.cpp
+++ b/src/plugins/projectexplorer/copystep.cpp
@@ -52,13 +52,13 @@ private:
            streamer.setDestination(m_target);
            return SetupResult::Continue;
        };
-        const auto onDone = [this](const FileStreamer &) {
+        const auto onDone = [this](const FileStreamer &, bool success) {
+            if (success)
                addOutput(Tr::tr("Copying finished."), OutputFormat::NormalMessage);
-        };
-        const auto onError = [this](const FileStreamer &) {
+            else
                addOutput(Tr::tr("Copying failed."), OutputFormat::ErrorMessage);
        };
-        return FileStreamerTask(onSetup, onDone, onError);
+        return FileStreamerTask(onSetup, onDone);
    }

    FilePath m_source;
--- a/src/plugins/qmakeprojectmanager/qmakestep.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakestep.cpp
@@ -275,14 +275,14 @@ Tasking::GroupItem QMakeStep::runRecipe()
        return SetupResult::StopWithDone;
    };

-    const auto setupQMake = [this](Process &process) {
+    const auto onQMakeSetup = [this](Process &process) {
        m_outputFormatter->setLineParsers({new QMakeParser});
        ProcessParameters *pp = processParameters();
        pp->setCommandLine(m_qmakeCommand);
        return setupProcess(process) ? SetupResult::Continue : SetupResult::StopWithError;
    };

-    const auto setupMakeQMake = [this](Process &process) {
+    const auto onMakeQMakeSetup = [this](Process &process) {
        auto *parser = new GnuMakeParser;
        parser->addSearchDir(processParameters()->workingDirectory());
        m_outputFormatter->setLineParsers({parser});
@@ -291,7 +291,7 @@ Tasking::GroupItem QMakeStep::runRecipe()
        return setupProcess(process) ? SetupResult::Continue : SetupResult::StopWithError;
    };

-    const auto onProcessDone = [this](const Process &process) { handleProcessDone(process); };
+    const auto onProcessDone = [this](const Process &process, bool) { handleProcessDone(process); };

    const auto onDone = [this] {
        emit buildConfiguration()->buildDirectoryInitialized();
@@ -300,9 +300,9 @@ Tasking::GroupItem QMakeStep::runRecipe()

    QList<GroupItem> processList = {onGroupSetup(onSetup),
                                    onGroupDone(onDone),
-                                    ProcessTask(setupQMake, onProcessDone, onProcessDone)};
+                                    ProcessTask(onQMakeSetup, onProcessDone)};
    if (m_runMakeQmake)
-        processList << ProcessTask(setupMakeQMake, onProcessDone, onProcessDone);
+        processList << ProcessTask(onMakeQMakeSetup, onProcessDone);

    return Group(processList);
 }
--- a/src/plugins/qnx/qnxdeployqtlibrariesdialog.cpp
+++ b/src/plugins/qnx/qnxdeployqtlibrariesdialog.cpp
@@ -119,21 +119,13 @@ QList<DeployableFile> collectFilesToUpload(const DeployableFile &deployable)

 GroupItem QnxDeployQtLibrariesDialogPrivate::checkDirTask()
 {
-    const auto setupHandler = [this](Process &process) {
+    const auto onSetup = [this](Process &process) {
        m_deployLogWindow->appendPlainText(Tr::tr("Checking existence of \"%1\"")
                                           .arg(fullRemoteDirectory()));
        process.setCommand({m_device->filePath("test"), {"-d", fullRemoteDirectory()}});
    };
-    const auto doneHandler = [this](const Process &process) {
-        Q_UNUSED(process)
-        const int answer = QMessageBox::question(q, q->windowTitle(),
-                Tr::tr("The remote directory \"%1\" already exists.\n"
-                       "Deploying to that directory will remove any files already present.\n\n"
-                       "Are you sure you want to continue?").arg(fullRemoteDirectory()),
-                       QMessageBox::Yes | QMessageBox::No);
-        m_checkResult = answer == QMessageBox::Yes ? CheckResult::RemoveDir : CheckResult::Abort;
-    };
-    const auto errorHandler = [this](const Process &process) {
+    const auto onDone = [this](const Process &process, bool success) {
+        if (!success) {
            if (process.result() != ProcessResult::FinishedWithError) {
                m_deployLogWindow->appendPlainText(Tr::tr("Connection failed: %1")
                                                       .arg(process.errorString()));
@@ -141,8 +133,16 @@ GroupItem QnxDeployQtLibrariesDialogPrivate::checkDirTask()
                return;
            }
            m_checkResult = CheckResult::SkipRemoveDir;
+            return;
+        }
+        const int answer = QMessageBox::question(q, q->windowTitle(),
+                Tr::tr("The remote directory \"%1\" already exists.\n"
+                       "Deploying to that directory will remove any files already present.\n\n"
+                       "Are you sure you want to continue?").arg(fullRemoteDirectory()),
+                       QMessageBox::Yes | QMessageBox::No);
+        m_checkResult = answer == QMessageBox::Yes ? CheckResult::RemoveDir : CheckResult::Abort;
    };
-    return ProcessTask(setupHandler, doneHandler, errorHandler);
+    return ProcessTask(onSetup, onDone);
 }

 GroupItem QnxDeployQtLibrariesDialogPrivate::removeDirTask()
--- a/src/plugins/qnx/qnxdevicetester.cpp
+++ b/src/plugins/qnx/qnxdevicetester.cpp
@@ -43,7 +43,7 @@ void QnxDeviceTester::testDevice(const ProjectExplorer::IDevice::Ptr &device)

    using namespace Tasking;

-    auto setupHandler = [device, this](Process &process) {
+    auto onSetup = [device, this](Process &process) {
        emit progressMessage(Tr::tr("Checking that files can be created in %1...")
                .arg(Constants::QNX_TMP_DIR));
        const QString pidFile = QString("%1/qtc_xxxx.pid").arg(Constants::QNX_TMP_DIR);
@@ -51,17 +51,18 @@ void QnxDeviceTester::testDevice(const ProjectExplorer::IDevice::Ptr &device)
            {"-c", QLatin1String("rm %1 > /dev/null 2>&1; echo ABC > %1 && rm %1").arg(pidFile)});
        process.setCommand(cmd);
    };
-    auto doneHandler = [this](const Process &) {
+    auto onDone = [this](const Process &process, bool success) {
+        if (success) {
            emit progressMessage(Tr::tr("Files can be created in /var/run.") + '\n');
-    };
-    auto errorHandler = [this](const Process &process) {
+            return;
+        }
        const QString message = process.result() == ProcessResult::StartFailed
                ? Tr::tr("An error occurred while checking that files can be created in %1.")
                    .arg(Constants::QNX_TMP_DIR) + '\n' + process.errorString()
                : Tr::tr("Files cannot be created in %1.").arg(Constants::QNX_TMP_DIR);
        emit errorMessage(message + '\n');
    };
-    setExtraTests({ProcessTask(setupHandler, doneHandler, errorHandler)});
+    setExtraTests({ProcessTask(onSetup, onDone)});

    RemoteLinux::GenericLinuxDeviceTester::testDevice(device);
 }
--- a/src/plugins/qnx/slog2inforunner.cpp
+++ b/src/plugins/qnx/slog2inforunner.cpp
@@ -34,27 +34,28 @@ void Slog2InfoRunner::start()
    using namespace Tasking;
    QTC_CHECK(!m_taskTree);

-    const auto testStartHandler = [this](Process &process) {
+    const auto onTestSetup = [this](Process &process) {
        process.setCommand({device()->filePath("slog2info"), {}});
    };
-    const auto testDoneHandler = [this](const Process &) {
+    const auto onTestDone = [this](const Process &, bool success) {
+        if (success) {
            m_found = true;
-    };
-    const auto testErrorHandler = [this](const Process &) {
+            return;
+        }
        appendMessage(Tr::tr("Warning: \"slog2info\" is not found on the device, "
                             "debug output not available."), ErrorMessageFormat);
    };

-    const auto launchTimeStartHandler = [this](Process &process) {
+    const auto onLaunchTimeSetup = [this](Process &process) {
        process.setCommand({device()->filePath("date"), "+\"%d %H:%M:%S\"", CommandLine::Raw});
    };
-    const auto launchTimeDoneHandler = [this](const Process &process) {
+    const auto onLaunchTimeDone = [this](const Process &process) {
        QTC_CHECK(!m_applicationId.isEmpty());
        QTC_CHECK(m_found);
        m_launchDateTime = QDateTime::fromString(process.cleanedStdOut().trimmed(), "dd HH:mm:ss");
    };

-    const auto logStartHandler = [this](Process &process) {
+    const auto onLogSetup = [this](Process &process) {
        process.setCommand({device()->filePath("slog2info"), {"-w"}});
        connect(&process, &Process::readyReadStandardOutput, this, [&] {
            processLogInput(QString::fromLatin1(process.readAllRawStandardOutput()));
@@ -63,15 +64,15 @@ void Slog2InfoRunner::start()
            appendMessage(QString::fromLatin1(process.readAllRawStandardError()), StdErrFormat);
        });
    };
-    const auto logErrorHandler = [this](const Process &process) {
+    const auto onLogError = [this](const Process &process) {
        appendMessage(Tr::tr("Cannot show slog2info output. Error: %1").arg(process.errorString()),
                      StdErrFormat);
    };

    const Group root {
-        ProcessTask(testStartHandler, testDoneHandler, testErrorHandler),
-        ProcessTask(launchTimeStartHandler, launchTimeDoneHandler),
-        ProcessTask(logStartHandler, {}, logErrorHandler)
+        ProcessTask(onTestSetup, onTestDone),
+        ProcessTask(onLaunchTimeSetup, onLaunchTimeDone),
+        ProcessTask(onLogSetup, {}, onLogError)
    };

    m_taskTree.reset(new TaskTree(root));
--- a/src/plugins/remotelinux/customcommanddeploystep.cpp
+++ b/src/plugins/remotelinux/customcommanddeploystep.cpp
@@ -53,7 +53,7 @@ expected_str<void> CustomCommandDeployStep::isDeploymentPossible() const

 GroupItem CustomCommandDeployStep::deployRecipe()
 {
-    const auto setupHandler = [this](Process &process) {
+    const auto onSetup = [this](Process &process) {
        addProgressMessage(Tr::tr("Starting remote command \"%1\"...").arg(commandLine()));
        process.setCommand({deviceConfiguration()->filePath("/bin/sh"),
                                 {"-c", commandLine()}});
@@ -65,11 +65,10 @@ GroupItem CustomCommandDeployStep::deployRecipe()
            handleStdErrData(proc->readAllStandardError());
        });
    };
-    const auto doneHandler = [this](const Process &) {
+    const auto onDone = [this](const Process &process, bool success) {
+        if (success) {
            addProgressMessage(Tr::tr("Remote command finished successfully."));
-    };
-    const auto errorHandler = [this](const Process &process) {
-        if (process.error() != QProcess::UnknownError
+        } else if (process.error() != QProcess::UnknownError
                || process.exitStatus() != QProcess::NormalExit) {
            addErrorMessage(Tr::tr("Remote process failed: %1").arg(process.errorString()));
        } else if (process.exitCode() != 0) {
@@ -77,7 +76,7 @@ GroupItem CustomCommandDeployStep::deployRecipe()
                .arg(process.exitCode()));
        }
    };
-    return ProcessTask(setupHandler, doneHandler, errorHandler);
+    return ProcessTask(onSetup, onDone);
 }


--- a/src/plugins/remotelinux/genericdirectuploadstep.cpp
+++ b/src/plugins/remotelinux/genericdirectuploadstep.cpp
@@ -135,17 +135,17 @@ GroupItem GenericDirectUploadStep::statTask(UploadStorage *storage,
                                            const DeployableFile &file,
                                            StatEndHandler statEndHandler)
 {
-    const auto setupHandler = [=](Process &process) {
+    const auto onSetup = [this, file](Process &process) {
        // We'd like to use --format=%Y, but it's not supported by busybox.
        process.setCommand({deviceConfiguration()->filePath("stat"),
                            {"-t", Utils::ProcessArgs::quoteArgUnix(file.remoteFilePath())}});
    };
-    const auto endHandler = [=](const Process &process) {
+    const auto onDone = [this, storage, file, statEndHandler](const Process &process, bool) {
        Process *proc = const_cast<Process *>(&process);
        const QDateTime timestamp = timestampFromStat(file, proc);
        statEndHandler(storage, file, timestamp);
    };
-    return ProcessTask(setupHandler, endHandler, endHandler);
+    return ProcessTask(onSetup, onDone);
 }

 GroupItem GenericDirectUploadStep::statTree(const TreeStorage<UploadStorage> &storage,
--- a/src/plugins/remotelinux/killappstep.cpp
+++ b/src/plugins/remotelinux/killappstep.cpp
@@ -45,7 +45,7 @@ private:

 GroupItem KillAppStep::deployRecipe()
 {
-    const auto setupHandler = [this](DeviceProcessKiller &killer) {
+    const auto onSetup = [this](DeviceProcessKiller &killer) {
        if (m_remoteExecutable.isEmpty()) {
            addSkipDeploymentMessage();
            return SetupResult::StopWithDone;
@@ -55,14 +55,13 @@ GroupItem KillAppStep::deployRecipe()
                                  .arg(m_remoteExecutable.path()));
        return SetupResult::Continue;
    };
-    const auto doneHandler = [this](const DeviceProcessKiller &) {
-        addProgressMessage(Tr::tr("Remote application killed."));
+    const auto onDone = [this](const DeviceProcessKiller &, bool success) {
+        const QString message = success ? Tr::tr("Remote application killed.")
+                                        : Tr::tr("Failed to kill remote application. "
+                                                 "Assuming it was not running.");
+        addProgressMessage(message);
    };
-    const auto errorHandler = [this](const DeviceProcessKiller &) {
-        addProgressMessage(Tr::tr("Failed to kill remote application. "
-                                    "Assuming it was not running."));
-    };
-    return DeviceProcessKillerTask(setupHandler, doneHandler, errorHandler);
+    return DeviceProcessKillerTask(onSetup, onDone);
 }

 KillAppStepFactory::KillAppStepFactory()
--- a/src/plugins/remotelinux/linuxdevicetester.cpp
+++ b/src/plugins/remotelinux/linuxdevicetester.cpp
@@ -92,38 +92,42 @@ QStringList GenericLinuxDeviceTesterPrivate::commandsToTest() const

 GroupItem GenericLinuxDeviceTesterPrivate::echoTask(const QString &contents) const
 {
-    const auto setup = [this, contents](Process &process) {
+    const auto onSetup = [this, contents](Process &process) {
        emit q->progressMessage(Tr::tr("Sending echo to device..."));
        process.setCommand({m_device->filePath("echo"), {contents}});
    };
-    const auto done = [this, contents](const Process &process) {
-        const QString reply = Utils::chopIfEndsWith(process.cleanedStdOut(), '\n');
-        if (reply != contents)
-            emit q->errorMessage(Tr::tr("Device replied to echo with unexpected contents: \"%1\"")
-                    .arg(reply) + '\n');
-        else
-            emit q->progressMessage(Tr::tr("Device replied to echo with expected contents.") + '\n');
-    };
-    const auto error = [this](const Process &process) {
+    const auto onDone = [this, contents](const Process &process, bool success) {
+        if (!success) {
            const QString stdErrOutput = process.cleanedStdErr();
            if (!stdErrOutput.isEmpty())
                emit q->errorMessage(Tr::tr("echo failed: %1").arg(stdErrOutput) + '\n');
            else
                emit q->errorMessage(Tr::tr("echo failed.") + '\n');
+            return;
+        }
+        const QString reply = Utils::chopIfEndsWith(process.cleanedStdOut(), '\n');
+        if (reply != contents) {
+            emit q->errorMessage(Tr::tr("Device replied to echo with unexpected contents: \"%1\"")
+                                     .arg(reply) + '\n');
+        } else {
+            emit q->progressMessage(Tr::tr("Device replied to echo with expected contents.")
+                                    + '\n');
+        }
    };
-    return ProcessTask(setup, done, error);
+    return ProcessTask(onSetup, onDone);
 }

 GroupItem GenericLinuxDeviceTesterPrivate::unameTask() const
 {
-    const auto setup = [this](Process &process) {
+    const auto onSetup = [this](Process &process) {
        emit q->progressMessage(Tr::tr("Checking kernel version..."));
        process.setCommand({m_device->filePath("uname"), {"-rsm"}});
    };
-    const auto done = [this](const Process &process) {
+    const auto onDone = [this](const Process &process, bool success) {
+        if (success) {
            emit q->progressMessage(process.cleanedStdOut());
-    };
-    const auto error = [this](const Process &process) {
+            return;
+        }
        const QString stdErrOutput = process.cleanedStdErr();
        if (!stdErrOutput.isEmpty())
            emit q->errorMessage(Tr::tr("uname failed: %1").arg(stdErrOutput) + '\n');
@@ -132,18 +136,21 @@ GroupItem GenericLinuxDeviceTesterPrivate::unameTask() const
    };
    return Group {
        finishAllAndDone,
-        ProcessTask(setup, done, error)
+        ProcessTask(onSetup, onDone)
    };
 }

 GroupItem GenericLinuxDeviceTesterPrivate::gathererTask() const
 {
-    const auto setup = [this](DeviceUsedPortsGatherer &gatherer) {
+    const auto onSetup = [this](DeviceUsedPortsGatherer &gatherer) {
        emit q->progressMessage(Tr::tr("Checking if specified ports are available..."));
        gatherer.setDevice(m_device);
    };
-    const auto done = [this](const DeviceUsedPortsGatherer &gatherer) {
-        if (gatherer.usedPorts().isEmpty()) {
+    const auto onDone = [this](const DeviceUsedPortsGatherer &gatherer, bool success) {
+        if (!success) {
+            emit q->errorMessage(Tr::tr("Error gathering ports: %1").arg(gatherer.errorString()) + '\n'
+                                 + Tr::tr("Some tools will not work out of the box.\n"));
+        } else if (gatherer.usedPorts().isEmpty()) {
            emit q->progressMessage(Tr::tr("All specified ports are available.") + '\n');
        } else {
            const QString portList = transform(gatherer.usedPorts(), [](const Port &port) {
@@ -153,28 +160,25 @@ GroupItem GenericLinuxDeviceTesterPrivate::gathererTask() const
                .arg(portList) + '\n');
        }
    };
-    const auto error = [this](const DeviceUsedPortsGatherer &gatherer) {
-        emit q->errorMessage(Tr::tr("Error gathering ports: %1").arg(gatherer.errorString()) + '\n'
-                           + Tr::tr("Some tools will not work out of the box.\n"));
-    };

    return Group {
        finishAllAndDone,
-        DeviceUsedPortsGathererTask(setup, done, error)
+        DeviceUsedPortsGathererTask(onSetup, onDone)
    };
 }

 GroupItem GenericLinuxDeviceTesterPrivate::transferTask(FileTransferMethod method,
                                           const TreeStorage<TransferStorage> &storage) const
 {
-    const auto setup = [this, method](FileTransfer &transfer) {
+    const auto onSetup = [this, method](FileTransfer &transfer) {
        emit q->progressMessage(Tr::tr("Checking whether \"%1\" works...")
                                .arg(FileTransfer::transferMethodName(method)));
        transfer.setTransferMethod(method);
        transfer.setTestDevice(m_device);
    };
-    const auto done = [this, method, storage](const FileTransfer &) {
+    const auto onDone = [this, method, storage](const FileTransfer &transfer, bool success) {
        const QString methodName = FileTransfer::transferMethodName(method);
+        if (success) {
            emit q->progressMessage(Tr::tr("\"%1\" is functional.\n").arg(methodName));
            if (method == FileTransferMethod::Rsync)
                m_device->setExtraData(Constants::SUPPORTS_RSYNC, true);
@@ -182,9 +186,8 @@ GroupItem GenericLinuxDeviceTesterPrivate::transferTask(FileTransferMethod metho
                m_device->setExtraData(Constants::SUPPORTS_SFTP, true);
            else
                storage->useGenericCopy = true;
-    };
-    const auto error = [this, method, storage](const FileTransfer &transfer) {
-        const QString methodName = FileTransfer::transferMethodName(method);
+            return;
+        }
        const ProcessResultData resultData = transfer.resultData();
        QString error;
        if (resultData.m_error == QProcess::FailedToStart) {
@@ -218,7 +221,7 @@ GroupItem GenericLinuxDeviceTesterPrivate::transferTask(FileTransferMethod metho
                                    + "\n");
        }
    };
-    return FileTransferTestTask(setup, done, error);
+    return FileTransferTestTask(onSetup, onDone);
 }

 GroupItem GenericLinuxDeviceTesterPrivate::transferTasks() const
@@ -238,23 +241,24 @@ GroupItem GenericLinuxDeviceTesterPrivate::transferTasks() const

 GroupItem GenericLinuxDeviceTesterPrivate::commandTask(const QString &commandName) const
 {
-    const auto setup = [this, commandName](Process &process) {
+    const auto onSetup = [this, commandName](Process &process) {
        emit q->progressMessage(Tr::tr("%1...").arg(commandName));
        CommandLine command{m_device->filePath("/bin/sh"), {"-c"}};
        command.addArgs(QLatin1String("\"command -v %1\"").arg(commandName), CommandLine::Raw);
        process.setCommand(command);
    };
-    const auto done = [this, commandName](const Process &) {
+    const auto onDone = [this, commandName](const Process &process, bool success) {
+        if (success) {
            emit q->progressMessage(Tr::tr("%1 found.").arg(commandName));
-    };
-    const auto error = [this, commandName](const Process &process) {
+            return;
+        }
        const QString message = process.result() == ProcessResult::StartFailed
                ? Tr::tr("An error occurred while checking for %1.").arg(commandName)
                  + '\n' + process.errorString()
                : Tr::tr("%1 not found.").arg(commandName);
        emit q->errorMessage(message);
    };
-    return ProcessTask(setup, done, error);
+    return ProcessTask(onSetup, onDone);
 }

 GroupItem GenericLinuxDeviceTesterPrivate::commandTasks() const
--- a/src/plugins/remotelinux/tarpackagecreationstep.cpp
+++ b/src/plugins/remotelinux/tarpackagecreationstep.cpp
@@ -153,17 +153,18 @@ Tasking::GroupItem TarPackageCreationStep::runRecipe()
        async.setFutureSynchronizer(&m_synchronizer);
        return SetupResult::Continue;
    };
-    const auto onDone = [this](const Async<void> &) {
+    const auto onDone = [this](const Async<void> &, bool success) {
+        if (!success) {
+            emit addOutput(Tr::tr("Packaging failed."), OutputFormat::ErrorMessage);
+            return;
+        }
        m_deploymentDataModified = false;
        emit addOutput(Tr::tr("Packaging finished successfully."), OutputFormat::NormalMessage);
        // TODO: Should it be the next task in sequence?
        connect(BuildManager::instance(), &BuildManager::buildQueueFinished,
                this, &TarPackageCreationStep::deployFinished);
    };
-    const auto onError = [this](const Async<void> &) {
-        emit addOutput(Tr::tr("Packaging failed."), OutputFormat::ErrorMessage);
-    };
-    return AsyncTask<void>(onSetup, onDone, onError);
+    return AsyncTask<void>(onSetup, onDone);
 }

 void TarPackageCreationStep::fromMap(const Store &map)
--- a/src/plugins/remotelinux/tarpackagedeploystep.cpp
+++ b/src/plugins/remotelinux/tarpackagedeploystep.cpp
@@ -67,26 +67,25 @@ QString TarPackageDeployStep::remoteFilePath() const

 GroupItem TarPackageDeployStep::uploadTask()
 {
-    const auto setupHandler = [this](FileTransfer &transfer) {
+    const auto onSetup = [this](FileTransfer &transfer) {
        const FilesToTransfer files {{m_packageFilePath,
                        deviceConfiguration()->filePath(remoteFilePath())}};
        transfer.setFilesToTransfer(files);
        connect(&transfer, &FileTransfer::progress, this, &TarPackageDeployStep::addProgressMessage);
        addProgressMessage(Tr::tr("Uploading package to device..."));
    };
-    const auto doneHandler = [this](const FileTransfer &) {
+    const auto onDone = [this](const FileTransfer &transfer, bool success) {
+        if (success)
            addProgressMessage(Tr::tr("Successfully uploaded package file."));
+        else
+            addErrorMessage(transfer.resultData().m_errorString);
    };
-    const auto errorHandler = [this](const FileTransfer &transfer) {
-        const ProcessResultData result = transfer.resultData();
-        addErrorMessage(result.m_errorString);
-    };
-    return FileTransferTask(setupHandler, doneHandler, errorHandler);
+    return FileTransferTask(onSetup, onDone);
 }

 GroupItem TarPackageDeployStep::installTask()
 {
-    const auto setupHandler = [this](Process &process) {
+    const auto onSetup = [this](Process &process) {
        const QString cmdLine = QLatin1String("cd / && tar xvf ") + remoteFilePath()
                + " && (rm " + remoteFilePath() + " || :)";
        process.setCommand({deviceConfiguration()->filePath("/bin/sh"), {"-c", cmdLine}});
@@ -99,14 +98,15 @@ GroupItem TarPackageDeployStep::installTask()
        });
        addProgressMessage(Tr::tr("Installing package to device..."));
    };
-    const auto doneHandler = [this](const Process &) {
+    const auto onDone = [this](const Process &process, bool success) {
+        if (success) {
            saveDeploymentTimeStamp(DeployableFile(m_packageFilePath, {}), {});
            addProgressMessage(Tr::tr("Successfully installed package file."));
-    };
-    const auto errorHandler = [this](const Process &process) {
+            return;
+        }
        addErrorMessage(Tr::tr("Installing package failed.") + process.errorString());
    };
-    return ProcessTask(setupHandler, doneHandler, errorHandler);
+    return ProcessTask(onSetup, onDone);
 }

 GroupItem TarPackageDeployStep::deployRecipe()
--- a/tests/manual/tasking/imagescaling/imagescaling.cpp
+++ b/tests/manual/tasking/imagescaling/imagescaling.cpp
@@ -79,27 +79,27 @@ void Images::process()
            query.setNetworkAccessManager(&qnam);
            query.setRequest(QNetworkRequest(url));
        };
-        const auto onDownloadDone = [storage](const NetworkQuery &query) {
+        const auto onDownloadDone = [this, storage, i](const NetworkQuery &query, bool success) {
+            if (success)
                *storage = query.reply()->readAll();
-        };
-        const auto onDownloadError = [this, i](const NetworkQuery &query) {
+            else
                labels[i]->setText(tr("Download\nError.\nCode: %1.").arg(query.reply()->error()));
        };

        const auto onScalingSetup = [storage](ConcurrentCall<QImage> &data) {
            data.setConcurrentCallData(&scale, *storage);
        };
-        const auto onScalingDone = [this, i](const ConcurrentCall<QImage> &data) {
+        const auto onScalingDone = [this, i](const ConcurrentCall<QImage> &data, bool success) {
+            if (success)
                labels[i]->setPixmap(QPixmap::fromImage(data.result()));
-        };
-        const auto onScalingError = [this, i](const ConcurrentCall<QImage> &) {
+            else
                labels[i]->setText(tr("Image\nData\nError."));
        };

        const Group group {
            Storage(storage),
-            NetworkQueryTask(onDownloadSetup, onDownloadDone, onDownloadError),
-            ConcurrentCallTask<QImage>(onScalingSetup, onScalingDone, onScalingError)
+            NetworkQueryTask(onDownloadSetup, onDownloadDone),
+            ConcurrentCallTask<QImage>(onScalingSetup, onScalingDone)
        };
        tasks.append(group);
        ++i;