When opening a repo in a dir that is not a bare repo then an exception is thrown

src/main/java/net/kemitix/gitdb/GitDB.java

@@ -22,6 +22,7 @@
 package net.kemitix.gitdb;
 
 import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
 
 import java.io.IOException;
 import java.nio.file.Path;
@@ -47,4 +48,12 @@ public interface GitDB {
         );
     }
 
+    static GitDBLocal openLocal(final Path dbDir) throws IOException {
+        try {
+            final Git git = Git.open(dbDir.toFile());
+            return new GitDBLocal(git);
+        } catch (RepositoryNotFoundException e) {
+            throw new GitDbRepoNotFoundException(dbDir, e);
+        }
+    }
 }

src/main/java/net/kemitix/gitdb/GitDBLocal.java

@@ -58,6 +58,10 @@ class GitDBLocal implements GitDB {
         }
     }
 
+    GitDBLocal(final Git git) {
+        this.git = git;
+    }
+
     private void validateDbDir(final File dbDir) throws IOException {
         verifyIsNotAFile(dbDir);
         if (dbDir.exists()) {

src/main/java/net/kemitix/gitdb/GitDbRepoNotFoundException.java

@@ -0,0 +1,23 @@
+package net.kemitix.gitdb;
+
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
+
+import java.nio.file.Path;
+
+/**
+ * Runtime exception thrown when attempting to open to location that is not a GitDB repo.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+public class GitDbRepoNotFoundException extends RuntimeException {
+
+    /**
+     * Constructor.
+     *
+     * @param path the path that is not a valid GitDB repo
+     * @param cause the original exception
+     */
+    GitDbRepoNotFoundException(final Path path, final RepositoryNotFoundException cause) {
+        super(cause);
+    }
+}

src/test/java/net/kemitix/gitdb/GitDBTest.java

@@ -6,14 +6,11 @@ import org.eclipse.jgit.api.errors.GitAPIException;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.junit.jupiter.MockitoExtension;
-import org.mockito.junit.jupiter.MockitoSettings;
-import org.mockito.quality.Strictness;
 
 import java.io.IOException;
 import java.nio.file.*;
 import java.util.List;
 
-import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.*;
 
@@ -120,6 +117,16 @@ class GitDBTest implements WithAssertions {
     }
 
     // When opening a repo in a dir that is not a bare repo then an exception is thrown
+    @Test
+    void openRepo_NotBareRepo_thenThrowException() throws IOException {
+        //given
+        final Path dir = dirExists();
+        //then
+        assertThatExceptionOfType(GitDbRepoNotFoundException.class)
+                .isThrownBy(() -> GitDB.openLocal(dir))
+                .withMessageContaining(dir.toString());
+    }
+
     // When opening a repo in a dir that is a file then an exception is thrown
     // When opening a repo in a dir that doesn't exist then an exception is thrown