Make clone actually fallback to import instead of just importing.

src/de/uni_passau/fim/gitwrapper/GitWrapper.java

 package de.uni_passau.fim.gitwrapper;
 
+import de.uni_passau.fim.processexecutor.ProcessExecutor;
+import de.uni_passau.fim.processexecutor.ToolNotWorkingException;
+import de.uni_passau.fim.processexecutor.ToolWrapper;
+
 import java.io.File;
 import java.io.IOException;
 import java.io.StringReader;
@@ -7,24 +11,13 @@ import java.io.StringWriter;
 import java.nio.file.InvalidPathException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.Scanner;
+import java.util.*;
 import java.util.function.Function;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import de.uni_passau.fim.processexecutor.ProcessExecutor;
-import de.uni_passau.fim.processexecutor.ToolNotWorkingException;
-import de.uni_passau.fim.processexecutor.ToolWrapper;
-
 import static java.util.Collections.singletonList;
 
 /**
@@ -91,7 +84,7 @@ public class GitWrapper extends ToolWrapper {
     /**
      * Attempts to clone the git repository at the given <code>url</code> into a directory under <code>parentDir</code>.
      * If <code>parentDir</code> already contains a git repository with the name that would be produced when cloning
-     * <code>url</code> it is assumed to be a clone of <code>url</code> and returned as a {@link Repository}.
+     * <code>url</code> it is assumed to be a clone of <code>url</code> and {@link #importRepository(File) imported} as a {@link Repository}.
      *
      * @param parentDir
      *         the directory in which to place the clone of <code>url</code>
@@ -143,7 +136,17 @@ public class GitWrapper extends ToolWrapper {
                 }
 
                 LOG.fine(() -> String.format("'%s' is a git repository. Assuming it is a clone of '%s'.", repoPath, url));
-                Repository repo = new Repository(this, url, repoDir);
+                Optional<Repository> maybeRepo = importRepository(repoDir);
+
+                if (!maybeRepo.isPresent()) {
+                    LOG.warning("Could not import repo from " + repoDir);
+                    return null;
+                }
+                Repository repo = maybeRepo.get();
+
+                if (!repo.getUrl().equals(url)) {
+                    LOG.warning("URL of imported repository (" + repo.getUrl() + ") does not match given URL (" + url + "). Proceeding anyway.");
+                }
 
                 if (fetch && !repo.fetch()) {
                     LOG.warning("Could not fetch " + repo + ". It may be out of date.");