Do not try to init non-git repos for git

The initialization to set the default branch in
git repositories should not be executed for
non-git repositories. Otherwise, this throws
exceptions in SVN repositories all the time
because the branch command is not supported.

Committed-by: Konstantin Schaper <konstantin.schaper@cloudogu.com>

gradle/changelog/git_initialization.yaml

@@ -0,0 +1,2 @@
+- type: fixed
+  description: Exception in SVN repositories due to incorrect git initialization

scm-plugins/scm-git-plugin/src/main/java/sonia/scm/repository/GitRepositoryConfigInitializer.java

@@ -50,6 +50,7 @@ public class GitRepositoryConfigInitializer {
 
   @Subscribe
   public void initConfig(PostReceiveRepositoryHookEvent event) {
+    if (GitRepositoryHandler.TYPE_NAME.equals(event.getRepository().getType())) {
       ConfigurationStore<GitRepositoryConfig> store = storeProvider.get(event.getRepository());
       GitRepositoryConfig repositoryConfig = store.get();
       if (repositoryConfig == null || Strings.isNullOrEmpty(repositoryConfig.getDefaultBranch())) {
@@ -61,6 +62,7 @@ public class GitRepositoryConfigInitializer {
         store.set(gitRepositoryConfig);
       }
     }
+  }
 
   private String determineDefaultBranch(List<String> defaultBranchCandidates) {
     String globalConfigDefaultBranch = repoHandler.getConfig().getDefaultBranch();

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/GitRepositoryConfigInitializerTest.java

@@ -65,10 +65,27 @@ class GitRepositoryConfigInitializerTest {
   @InjectMocks
   private GitRepositoryConfigInitializer initializer;
 
+  @Test
+  void shouldSkipNonGitRepositories() {
+    REPOSITORY.setType("svn");
+
+    initializer.initConfig(event);
+
+    verify(event, never()).getContext();
+  }
+
+  @BeforeEach
+  void initEvent() {
+    when(event.getRepository()).thenReturn(REPOSITORY);
+  }
+
+  @Nested
+  class ForGitRepositories {
+
     @BeforeEach
     void initMocks() {
       when(storeProvider.get(REPOSITORY)).thenReturn(configStore);
-    when(event.getRepository()).thenReturn(REPOSITORY);
+      REPOSITORY.setType("git");
     }
 
     @Test
@@ -173,5 +190,5 @@ class GitRepositoryConfigInitializerTest {
       when(hookContext.getBranchProvider()).thenReturn(branchProvider);
       when(branchProvider.getCreatedOrModified()).thenReturn(branches);
     }
-
+  }
 }