diff --git a/worker.cpp b/worker.cpp
index 4e79550..4a2a430 100644
--- a/worker.cpp
+++ b/worker.cpp
@@ -148,6 +148,83 @@ void Worker::update() {
     std::call_once(once, &Worker::privateUpdate, this);
 }
 
+bool Worker::isRepositoryCorrupted() {
+    QDir customerRepository(m_customerRepository);
+    if (customerRepository.exists()) {
+        QDir customerRepositoryEtc(QDir::cleanPath(m_customerRepository + QDir::separator() + "etc/"));
+        QDir customerRepositoryOpt(QDir::cleanPath(m_customerRepository + QDir::separator() + "opt/"));
+        QDir customerRepositoryGit(QDir::cleanPath(m_customerRepository + QDir::separator() + ".git/"));
+        // etc-directory inside git-repository does not exist, which means the
+        // git-repository is corrupted -> remove it and start from scratch
+        if (!customerRepositoryEtc.exists()
+         || !customerRepositoryGit.exists()
+         || !customerRepositoryOpt.exists()) {
+            // should never happen
+            Utils::printCriticalErrorMsg("CORRUPTED CUSTOMER REPOSITORY");
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool Worker::repairCorruptedRepository() {
+    QDir customerRepository(m_customerRepository);
+    if (!customerRepository.removeRecursively()) {
+        Utils::printCriticalErrorMsg("ERROR REMOVING CORR. CUST-REPOSITORY");
+        m_updateStatus = UpdateStatus(UPDATE_STATUS::REMOVE_GIT_REPOSITORY_FAILED,
+                            QString("REMOVAL OF GIT-REPOSITORY %1 FAILED").arg(m_customerRepository));
+        IsmasClient::sendRequestReceiveResponse(IsmasClient::APISM::DB_PORT,
+            QString("#M=APISM#C=CMD_EVENT#J=") +
+                m_ismasClient.sanityCheckFailed(IsmasClient::RESULT_CODE::INSTALL_ERROR,
+                                                m_updateStatus.m_statusDescription));
+        emit showErrorMessage("apism sanity check", m_updateStatus.m_statusDescription);
+        return false;
+    }
+    return true;
+
+}
+
+int Worker::sendCloneAndCheckoutFailure() {
+    stopProgressLoop();
+    setProgress(0);
+    m_updateStatus = UpdateStatus(UPDATE_STATUS::GIT_CLONE_AND_CHECKOUT_FAILURE,
+                          QString("CLONE OR CHECKOUT FAILED: ") + m_customerRepository);
+    IsmasClient::sendRequestReceiveResponse(IsmasClient::APISM::DB_PORT,
+        QString("#M=APISM#C=CMD_EVENT#J=") +
+            m_ismasClient.errorGitClone(100, m_updateStatus.m_statusDescription));
+
+    return CLONE_AND_CHECKOUT_FAILURE;
+}
+
+int Worker::sendCloneAndCheckoutSuccess() {
+    m_updateStatus = UpdateStatus(UPDATE_STATUS::GIT_CLONE_AND_CHECKOUT_SUCCESS,
+                          QString("CLONED REPOSITORY %1 AND CHECKED OUT BRANCH %2")
+                            .arg(m_customerRepository)
+                            .arg(m_gc.branchName()));
+
+    IsmasClient::sendRequestReceiveResponse(IsmasClient::APISM::DB_PORT,
+            QString("#M=APISM#C=CMD_EVENT#J=") +
+                m_ismasClient.cloneAndCheckoutCustomerRepository(
+                    m_updateStatus.m_statusDescription));
+
+    return CLONE_AND_CHECKOUT_SUCCESS;
+}
+
+int Worker::sendIsmasTriggerFailure() {
+    stopProgressLoop();
+    setProgress(0);
+    m_updateStatus = UpdateStatus(UPDATE_STATUS::ISMAS_UPDATE_TRIGGER_SET_FAILURE,
+                        QString("ISMAS update trigger wrong"));
+    IsmasClient::sendRequestReceiveResponse(IsmasClient::APISM::DB_PORT,
+        QString("#M=APISM#C=CMD_EVENT#J=") +
+            m_ismasClient.updateOfPSAFailed(IsmasClient::RESULT_CODE::INSTALL_ERROR,
+                                            "CHECK-UPDATE-TRIGGER",
+                                            m_updateStatus.m_statusDescription));
+    return ISMAS_TRIGGER_FAILURE;
+}
+
+
 void Worker::privateUpdate() {
     if (!m_mainWindow) {
         Utils::printCriticalErrorMsg("m_mainWindow NOT SET");