diff --git a/git/git_client.cpp b/git/git_client.cpp
index 17eacd9..d71374d 100644
--- a/git/git_client.cpp
+++ b/git/git_client.cpp
@@ -1,36 +1,97 @@
 #include "git_client.h"
 #include "update.h"
+#include "worker.h"
 
 #include <QRegularExpression>
 #include <QDebug>
 #include <QDir>
 
-GitClient::GitClient(QString const &workingDirectory, QString const &branchName)
-  : m_workingDirectory(workingDirectory)
-  , m_branchName(branchName) {
+
+GitClient::GitClient(QString const &repositoryPath,
+                     QString const &customerId,
+                     QString const &workingDirectory,
+                     QString const &branchName,
+                     QObject *parent)
+  : QObject(parent)
+  , m_worker(qobject_cast<Worker *>(parent))
+  , m_repositoryPath(repositoryPath)
+  , m_customerId(customerId)
+  , m_workingDirectory(workingDirectory)
+  , m_branchName(branchName)
+  , m_customerRepository(QDir::cleanPath(m_workingDirectory
+                                       + QDir::separator()
+                                       + m_customerId)) {
+    if (!m_worker) {
+        qCritical() << "ERROR CASTING PARENT TO WORKER FAILED";
+    }
+
+    connect(this, SIGNAL(ismasUpdatesAvailable()),
+            this, SLOT(onIsmasUpdatesAvailable()), Qt::QueuedConnection);
 }
 
-void GitClient::setWorkingDirectory(QString const &workingDirectory) {
-    m_workingDirectory = workingDirectory;
+void GitClient::onIsmasUpdatesAvailable() {
+    if (QDir(m_customerRepository).exists()) {
+        qInfo() << "FETCHING OF" << m_repositoryPath
+                << "INTO" << m_customerRepository;
+        std::optional<QString> changes = gitFetch();
+        if (changes) {
+            std::optional<QStringList> changedFileNames = gitDiff(changes.value());
+            if (changedFileNames) {
+                for (int i=0;i<changedFileNames.value().size();++i) {
+                    QString fname = changedFileNames.value().at(i);
+                    QString lastCommit = gitLastCommit(fname);
+                    qDebug() << "CCCC" << changedFileNames.value().at(i) << lastCommit;
+                }
+                if (gitPull()) {
+                    emit m_worker->handleChangedFiles(changedFileNames.value());
+                } else {
+                    qCritical() << "PULL FAILED FOR" << m_repositoryPath
+                                << "IN " << m_customerRepository;
+                    emit m_worker->terminateUpdateProcess();
+                }
+            } else {
+                qCritical() << "NO CHANGES IN" << m_repositoryPath
+                            << "(" << m_customerRepository << ")";
+                emit m_worker->finishUpdateProcess(false);
+            }
+        } else {
+            qCritical() << "NO CHANGES IN" << m_repositoryPath
+                        << "(" << m_customerRepository << ")";
+            emit m_worker->finishUpdateProcess(false);
+        }
+    } else {
+        if (gitCloneAndCheckoutBranch()) {
+            qInfo() << "CLONED" << m_repositoryPath
+                    << "AND CHECKED OUT INTO" << m_customerRepository;
+            if (m_worker) {
+                qDebug() << "WORKER EXECUTE OPKG COMMANDS";
+                QStringList opkgCommands;
+                // To make sure that opkg upgrade does not break your system
+                // because of an unstable connection
+                // Add a line "option cache cachedir" to /etc/opkg/opkg.conf to
+                // avoid the --cache option on command line.
+                opkgCommands << "opkg update";
+                //opkgCommands << "opkg --cache cachedir --download-only upgrade";
+                //opkgCommands << "opkg --cache cachedir upgrade";
+                emit m_worker->executeOpkgCommands(opkgCommands);
+            }
+        } else {
+            qCritical() << "ERROR CLONING " << m_repositoryPath
+                        << "AND/OR CHECKING OUT INTO" << m_customerRepository;
+            emit m_worker->terminateUpdateProcess();
+        }
+    }
 }
 
-QString GitClient::workingDirectory() const {
-    return m_workingDirectory;
-}
-
-void GitClient::setBranchName(QString const &branchName) {
-    m_branchName = branchName;
-}
-
-QString GitClient::branchName() const {
-    return m_branchName;
-}
-
-std::optional<QString> GitClient::gitCloneRepository(QString const &repPath) {
+bool GitClient::gitCloneCustomerRepository() {
     QString gitCommand("git clone ");
-    gitCommand += repPath;
+    gitCommand += m_repositoryPath;
     Command c(gitCommand);
-    if (c.execute(m_workingDirectory)) {
+
+    qInfo() << "IN CURRENT WD" << m_workingDirectory
+            << "CLONE" << m_repositoryPath << "...";
+
+    if (c.execute(m_workingDirectory)) { // execute the command in wd
         QString result = c.getCommandResult();
         if (!result.isEmpty()) {
             // Cloning into 'customer_281'...\n
@@ -38,83 +99,128 @@ std::optional<QString> GitClient::gitCloneRepository(QString const &repPath) {
             QRegularExpressionMatch match = re.match(result);
             if (match.hasMatch()) {
                 if (re.captureCount() == 3) { // start with full match (0), then the other 3 matches
-                    return match.captured(2);
+                    if (match.captured(2).trimmed() == m_customerId) {
+                        qInfo() << "CLONING" << m_repositoryPath << "OK";
+                        return true;
+                    }
                 }
             }
+            qCritical() << "ERROR CLONE RESULT HAS WRONG FORMAT";
         }
     }
-    return std::nullopt;
+    return false;
 }
 
-bool GitClient::gitCheckout(QString const &branchName) {
-    QString gitCommand("git checkout ");
-    gitCommand += branchName;
-    Command c(gitCommand);
-    return c.execute(m_workingDirectory);
+bool GitClient::copyGitConfigFromMaster() { // only allowed when called in
+                                            // master branch
+    if (QDir(m_customerRepository).exists()) {
+        QString const cp = QString("cp .gitconfig .git/config");
+        Command c("bash");
+        if (c.execute(m_customerRepository, QStringList() << "-c" << cp)) {
+            qInfo() << "cp .gitconfig .git/config OK";
+            return true;
+        }
+        qCritical() << "ERROR cp .gitconfig .git/config";
+    }
+    return false;
 }
 
-std::optional<QString> GitClient::gitCloneBranch(QString const &repPath,
-                                                 QString const &branchName) {
-    if (std::optional<QString> rep = gitCloneRepository(repPath)) {
-        QDir wd(m_workingDirectory);
-        if (wd.cd(rep.value())) {
-            m_workingDirectory = wd.absolutePath();
-            if (gitCheckout(branchName)) {
-                return branchName;
-            }
+bool GitClient::gitCheckoutBranch() {
+    if (QDir(m_customerRepository).exists()) {
+        QString gitCommand("git checkout ");
+        gitCommand += m_branchName;
+        Command c(gitCommand);
+        return c.execute(m_customerRepository); // execute command in customerRepo
+    }
+    qCritical() << "ERROR" << m_customerRepository << "DOES NOT EXIST";
+    return false;
+}
+
+bool GitClient::gitCloneAndCheckoutBranch() {
+    qInfo() << "CLONE" << m_repositoryPath << "AND CHECKOUT" << m_branchName;
+    if (gitCloneCustomerRepository()) {
+        if (copyGitConfigFromMaster()) {
+            return gitCheckoutBranch();
         }
     }
-    return std::nullopt;
+    return false;
 }
 
+/*
+ Zu beachten: wird eine datei neu hinzugefuegt (git add/commit) dann aber gleich
+ wieder geloscht, so wird sie im diff nicht angezeigt.
+ */
 std::optional<QStringList> GitClient::gitDiff(QString const &commits) {
-    // 409f198..6c22726
-    QString gitCommand("git diff --compact-summary ");
-    gitCommand += commits;
+    if (QDir(m_customerRepository).exists()) {
+        // 409f198..6c22726
+        QString gitCommand("git diff --compact-summary ");
+        gitCommand += commits;
 
-    Command c(gitCommand);
-    if (c.execute(m_workingDirectory)) {
-        QString s = c.getCommandResult().trimmed();
-        QStringList lines = Update::split(s, '\n');
-        QStringList fileNames;
-        // each line has the format "etc/psa_config/DC2C_print01.json | 1 +
-        // or the format            "etc/psa_config/DC2C_print01.json (new) | 1 +
-        // the filenames are relativ to the repository
-        for (int i = 0; i < lines.size(); ++i) {
-            int newIndex = lines.at(i).indexOf("(new)");
-            if (newIndex != -1) {
-                QString fileName = lines.at(i).mid(0, newIndex).trimmed();
-                fileNames << fileName;
-            } else {
-                int pipeIndex = lines.at(i).indexOf('|');
-                if (pipeIndex != -1) {
-                    QString fileName = lines.at(i).mid(0, pipeIndex).trimmed();
+        Command c(gitCommand);
+        if (c.execute(m_customerRepository)) { // execute command in local customerRepo
+            QString s = c.getCommandResult().trimmed();
+            QStringList lines = Update::split(s, '\n');
+            QStringList fileNames;
+            // each line has the format "etc/psa_config/DC2C_print01.json | 1 +
+            // or the format            "etc/psa_config/DC2C_print01.json (new) | 1 +
+            // the filenames are relativ to the repository
+            for (int i = 0; i < lines.size(); ++i) {
+                // TODO: koennte auch (delete) kommen ?
+                int newIndex = lines.at(i).indexOf("(new)");    // for new files
+                // int goneIndex = lines.at(i).indexOf("(gone)");  // for removed files
+                if (newIndex != -1) {
+                    QString fileName = lines.at(i).mid(0, newIndex).trimmed();
                     fileNames << fileName;
+                } else {
+                    int pipeIndex = lines.at(i).indexOf('|');
+                    if (pipeIndex != -1) {
+                        QString fileName = lines.at(i).mid(0, pipeIndex).trimmed();
+                        fileNames << fileName;
+                    }
                 }
             }
-        }
-        if (!fileNames.isEmpty()) {
-            return fileNames;
+            if (!fileNames.isEmpty()) {
+                return fileNames;
+            }
         }
     }
     return std::nullopt;
 }
 
+/*
+ Hat sich nichts geaendert, so werden auch keine Commits <>..<> angezeigt
+ */
 std::optional<QString> GitClient::gitFetch() {
-    Command c("git fetch");
-    if (c.execute(m_workingDirectory)) {
-        QString s = c.getCommandResult().trimmed();
-        QStringList lines = Update::split(s, '\n');
-        if (!lines.empty()) {
-            // 409f198..6c22726  zg1/zone1  -> origin/zg1/zone1
-            static QRegularExpression re("(^\\s*)([0-9A-Fa-f]+..[0-9A-Fa-f]+)(.*$)");
-            QRegularExpressionMatch match = re.match(lines.last());
-            if (match.hasMatch()) {
-                if (re.captureCount() == 3) { // start with full match (0), then the other 3 matches
-                    return match.captured(2);
+    QString const &customerRepository
+        = QDir::cleanPath(m_workingDirectory + QDir::separator() + m_customerId);
+    if (QDir(customerRepository).exists()) {
+        Command c("git fetch");
+        if (c.execute(customerRepository)) {
+            QString const s = c.getCommandResult().trimmed();
+            if (!s.isEmpty()) {
+                QStringList lines = Update::split(s, '\n');
+                if (!lines.empty()) {
+                    // 409f198..6c22726  zg1/zone1  -> origin/zg1/zone1
+                    static QRegularExpression re("(^\\s*)([0-9A-Fa-f]+..[0-9A-Fa-f]+)(.*$)");
+                    QRegularExpressionMatch match = re.match(lines.last());
+                    if (match.hasMatch()) {
+                        if (re.captureCount() == 3) { // start with full match (0), then the other 3 matches
+                            return match.captured(2);
+                        } else {
+                            qCritical() << "ERROR WRONG CAPTURE COUNT FOR 'GIT FETCH'" << re.captureCount();
+                        }
+                    } else {
+                        qCritical() << "ERROR NO MATCH OF COMMITS FOR 'GIT FETCH'";
+                    }
+                } else {
+                    qCritical() << "ERROR WRONG FORMAT FOR RESULT FOR 'GIT FETCH'" << s;
                 }
+            } else {
+                qCritical() << "ERROR EMPTY RESULT FROM 'GIT FETCH'";
             }
         }
+    } else {
+        qCritical() << "ERROR" << customerRepository << "DOES NOT EXIST";
     }
     return std::nullopt;
 }
@@ -129,8 +235,15 @@ bool GitClient::gitFetchAndDiff() {
 }
 
 bool GitClient::gitPull() {
-    Command c("git pull");
-    return c.execute(m_workingDirectory);
+    if (QDir(m_customerRepository).exists()) {
+        Command c("git pull");
+        if (c.execute(m_customerRepository)) {
+            qInfo() << "PULLED INTO" << m_customerRepository;
+            return true;
+        }
+        qCritical() << "PULL INTO" << m_customerRepository << "FAILED";
+    }
+    return false;
 }
 
 std::optional<QStringList> GitClient::gitMerge() {
@@ -142,3 +255,65 @@ std::optional<QStringList> GitClient::gitMerge() {
     }
     return std::nullopt;
 }
+
+QString GitClient::gitLastCommit(QString fileName) {
+    if (QDir(m_customerRepository).exists()) {
+        QString const filePath
+            = QDir::cleanPath(m_customerRepository + QDir::separator() + fileName);
+        QString const gitCommand = QString("git log %1 | head -n 1").arg(fileName);
+        Command c("bash");
+        if (c.execute(m_customerRepository, QStringList() << "-c" << gitCommand)) {
+            QString const r = c.getCommandResult();
+            int const idx = r.indexOf("commit ");
+            if (idx != -1) {
+                return r.mid(idx + 8).trimmed();
+            }
+        }
+    }
+    return "";
+}
+
+// get the blob of the file(name) passed as $1
+// note: this can be used for any file in the filesystem
+QString GitClient::gitBlob(QString fileName) {
+    if (QDir(m_customerRepository).exists()) {
+        QString const filePath
+            = QDir::cleanPath(m_customerRepository + QDir::separator() + fileName);
+        QString const gitCommand = QString("git hash-object %1").arg(fileName);
+        Command c(gitCommand);
+        if (c.execute(m_customerRepository)) {
+            return c.getCommandResult();
+        }
+    }
+    return "";
+}
+
+QString GitClient::gitCommitForBlob(QString blob) {
+    if (QDir(m_customerRepository).exists()) {
+        QString const gitCommand
+            = QString("git whatchanged --all --find-object=%1 | head -n 1").arg(blob);
+        Command c(gitCommand);
+        if (c.execute(m_customerRepository)) {
+            return c.getCommandResult();
+        }
+    }
+    return "";
+}
+
+bool GitClient::gitIsFileTracked(QString fName) {
+    if (QDir(m_customerRepository).exists()) {
+        QString const gitCommand
+            = QString("git ls-files --error-unmatch %1").arg(fName);
+        Command c(gitCommand);
+        return c.execute(m_customerRepository);
+    }
+    return false;
+}
+
+
+//get_commit_for_blob () {
+//    # search for the blob in all commits for the file(name) $1
+//    echo $(git log --all --pretty=format:%H -- $2   |
+//           xargs -I{} bash -c "git ls-tree {} -- $2 |
+//           grep -q $1 && echo -n {} && head -n 1")
+//}