Use "real paths" instead of absolute paths

See issue #82 for details:
https://bitbucket.org/sdorra/scm-manager/issues/82/symbolic-link-in-hg-repository-path

scm-dao-xml/src/main/java/sonia/scm/repository/xml/XmlRepositoryDAO.java

@@ -45,8 +45,8 @@ import sonia.scm.store.ConfigurationStoreFactory;
 import sonia.scm.xml.AbstractXmlDAO;
 
 import java.io.File;
+import java.io.IOException;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.Collection;
 import java.util.Optional;
 
@@ -158,11 +158,22 @@ public class XmlRepositoryDAO
 
   @Override
   public String getIdForDirectory(File path) {
-    return db.getPaths().stream()
-      .filter(p -> path.toPath().startsWith(context.getBaseDirectory().toPath().resolve(p.getPath()).toAbsolutePath()))
-      .map(RepositoryPath::getId)
-      .findAny()
-      .orElseThrow(() -> new RuntimeException("could not find repository for directory: " + path));
+    for (RepositoryPath p : db.getPaths()) {
+      if (toRealPath(path.toPath()).startsWith(toRealPath(context.getBaseDirectory().toPath().resolve(p.getPath())))) {
+        return p.getId();
+      }
+    }
+    throw new RuntimeException("could not find repository for directory: " + path);
+  }
+
+  private Path toRealPath(Path path) {
+    try {
+      // resolve links and other indirections
+      // (see issue #82, https://bitbucket.org/sdorra/scm-manager/issues/82/symbolic-link-in-hg-repository-path)
+      return path.toRealPath();
+    } catch (IOException e) {
+      throw new RuntimeException("could not get Path$toRealPath for path: " + path);
+    }
   }
 
   private Optional<RepositoryPath> findExistingRepositoryPath(Repository repository) {

scm-dao-xml/src/test/java/sonia/scm/repository/xml/XmlRepositoryDAOTest.java

@@ -15,6 +15,7 @@ import sonia.scm.store.ConfigurationStoreFactory;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Path;
 
 import static java.util.Collections.emptyList;
@@ -118,6 +119,7 @@ public class XmlRepositoryDAOTest {
 
   @Test
   public void shouldFindRepositoryForRelativePath() {
+    new File(context.getBaseDirectory(), "relative/path/data").mkdirs();
     Repository existingRepository = new Repository("id", "old", null, null);
     RepositoryPath repositoryPath = new RepositoryPath("relative/path", "id", existingRepository);
     when(db.getPaths()).thenReturn(asList(repositoryPath));
@@ -130,14 +132,31 @@ public class XmlRepositoryDAOTest {
   }
 
   @Test
-  public void shouldFindRepositoryForAbsolutePath() {
+  public void shouldFindRepositoryForAbsolutePath() throws IOException {
     Repository existingRepository = new Repository("id", "old", null, null);
-    RepositoryPath repositoryPath = new RepositoryPath("/tmp/somewhere/else", "id", existingRepository);
+    File folder = temporaryFolder.newFolder("somewhere", "data");
+    RepositoryPath repositoryPath = new RepositoryPath(folder.getParent(), "id", existingRepository);
     when(db.getPaths()).thenReturn(asList(repositoryPath));
 
     XmlRepositoryDAO dao = new XmlRepositoryDAO(storeFactory, new InitialRepositoryLocationResolver(context), context);
 
-    String id = dao.getIdForDirectory(new File("/tmp/somewhere/else/data"));
+    String id = dao.getIdForDirectory(folder);
+
+    assertThat(id).isEqualTo("id");
+  }
+
+  @Test
+  public void shouldFindRepositoryForLinks() throws IOException {
+    Repository existingRepository = new Repository("id", "old", null, null);
+    File folder = temporaryFolder.newFolder("somewhere", "else", "data");
+    File link = new File(folder.getParentFile().getParentFile(), "link");
+    Files.createSymbolicLink(link.toPath(), folder.getParentFile().toPath());
+    RepositoryPath repositoryPath = new RepositoryPath(new File(link, "data").getPath(), "id", existingRepository);
+    when(db.getPaths()).thenReturn(asList(repositoryPath));
+
+    XmlRepositoryDAO dao = new XmlRepositoryDAO(storeFactory, new InitialRepositoryLocationResolver(context), context);
+
+    String id = dao.getIdForDirectory(folder);
 
     assertThat(id).isEqualTo("id");
   }

scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgHookCallbackServlet.java

@@ -455,10 +455,6 @@ public class HgHookCallbackServlet extends HttpServlet
     String path = request.getParameter(PARAM_REPOSITORYPATH);
 
     if (Util.isNotEmpty(path)) {
-      /*
-       * use canonical path to fix symbolic links
-       * https://bitbucket.org/sdorra/scm-manager/issue/82/symbolic-link-in-hg-repository-path
-       */
       id = repositoryDAO.getIdForDirectory(new File(path));
     }
     else if (logger.isWarnEnabled())