fix: set default branch on main

Author: sparsick

testcontainers-gitserver/src/main/java/com/github/sparsick/testcontainers/gitserver/plain/GitServerContainer.java

@@ -17,7 +17,7 @@
 public class GitServerContainer extends GenericContainer<GitServerContainer> {
 
     private static final String GIT_PASSWORD_KEY = "GIT_PASSWORD";
-    private static DockerImageName DEFAULT_DOCKER_IMAGE_NAME = DockerImageName.parse("rockstorm/git-server");
+    private static final DockerImageName DEFAULT_DOCKER_IMAGE_NAME = DockerImageName.parse("rockstorm/git-server");
     private String gitRepoName = "testRepo";
     private String pathToExistingRepo;
     private SshIdentity sshClientIdentity;
@@ -153,6 +153,7 @@ private void configureGitRepository() {
                 execInContainer("git", "init", "--bare", gitRepoPath);
                 execInContainer("chown", "-R", "git:git", "/srv");
             }
+            execInContainer("git", "symbolic-ref", "HEAD", "refs/heads/main");
         } catch (IOException | InterruptedException e) {
             throw new RuntimeException("Configure Git repository failed",e);
         }

testcontainers-gitserver/src/test/java/com/github/sparsick/testcontainers/gitserver/plain/GitServerContainerTest.java

@@ -31,7 +31,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Stream;
-import java.util.stream.StreamSupport;
 
 import static org.assertj.core.api.Assertions.assertThatNoException;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
@@ -126,7 +125,6 @@ void copyExistingGitRepo(@TempDir File sampleRepo) throws GitAPIException, IOExc
                 Git.cloneRepository()
                         .setURI(gitRepoURI.toString())
                         .setDirectory(tempDir)
-                        .setBranch("main")
                         .setTransportConfigCallback(GitServerContainerTest::configureWithPasswordAndNoHostKeyChecking)
                         .call()
         );
@@ -149,7 +147,6 @@ void copyExistingGitRepoWithCustomRepoName(@TempDir File sampleRepo) throws IOEx
                 Git.cloneRepository()
                         .setURI(gitRepoURI.toString())
                         .setDirectory(tempDir)
-                        .setBranch("main")
                         .setTransportConfigCallback(GitServerContainerTest::configureWithPasswordAndNoHostKeyChecking)
                         .call()
         );
@@ -170,7 +167,6 @@ void setupGitRepo(GitServerVersions gitServer) {
                 Git.cloneRepository()
                         .setURI(gitRepoURI.toString())
                         .setDirectory(tempDir)
-                        .setBranch("main")
                         .setTransportConfigCallback(GitServerContainerTest::configureWithPasswordAndNoHostKeyChecking)
                         .call()
         );
@@ -189,7 +185,6 @@ void pubKeyAuth(GitServerVersions gitServer) {
                 Git.cloneRepository()
                         .setURI(gitRepoURI.toString())
                         .setDirectory(tempDir)
-                        .setBranch("main")
                         .setTransportConfigCallback(configureWithSshIdentityAndNoHostVerification(containerUnderTest.getSshClientIdentity()))
                         .call()
         );
@@ -210,12 +205,30 @@ void strictHostKeyVerifivation(GitServerVersions gitServer) {
                 Git.cloneRepository()
                         .setURI(gitRepoURI.toString())
                         .setDirectory(tempDir)
-                        .setBranch("main")
                         .setTransportConfigCallback(configureWithSshIdentityAndHostKey(containerUnderTest.getSshClientIdentity(), containerUnderTest.getHostKey()))
                         .call()
         );
     }
 
+    @ParameterizedTest
+    @EnumSource(GitServerVersions.class)
+    void defaultBranch(GitServerVersions gitServer) throws GitAPIException, IOException {
+        var containerUnderTest = new GitServerContainer(gitServer.getDockerImageName());
+
+        containerUnderTest.start();
+
+        URI gitRepoURI = containerUnderTest.getGitRepoURIAsSSH();
+
+        Git repo = Git.cloneRepository()
+                .setURI(gitRepoURI.toString())
+                .setDirectory(tempDir)
+                .setTransportConfigCallback(GitServerContainerTest::configureWithPasswordAndNoHostKeyChecking)
+                .call();
+
+        String currentBranch = repo.getRepository().getBranch();
+        assertThat(currentBranch).isEqualTo("main");
+    }
+
     @NotNull
     private TransportConfigCallback configureWithSshIdentityAndHostKey(SshIdentity sshIdentity, SshHostKey hostKey) {
         return transport -> {