Maven enforcer plugin: Add support for Changed, Unmerged, Unknown git file filters

Signed-off-by: tvallin <[email protected]>

Author: tvallin

common/common/src/test/java/io/helidon/build/common/FileUtilsTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023, 2024 Oracle and/or its affiliates.
+ * Copyright (c) 2023, 2025 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,11 +32,13 @@
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
+import static io.helidon.build.common.FileUtils.ensureFile;
 import static io.helidon.build.common.FileUtils.list;
 import static io.helidon.build.common.FileUtils.newZipFileSystem;
 import static io.helidon.build.common.FileUtils.unique;
 import static io.helidon.build.common.FileUtils.unzip;
 import static io.helidon.build.common.FileUtils.zip;
+import static io.helidon.build.common.FileUtils.isSubModule;
 import static io.helidon.build.common.Unchecked.unchecked;
 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
 import static java.nio.file.attribute.PosixFilePermission.GROUP_EXECUTE;
@@ -155,6 +157,16 @@ void testE2ePermissions2() throws IOException {
         zipAndUnzip(zipDir);
     }
 
+    @Test
+    void testIsSubmodule() throws IOException {
+        Path blue = TestFiles.targetDir(FileUtilsTest.class).resolve("test-classes/vfs/blue");
+        Path submodule = ensureFile(outputDir.resolve("submodule"));
+        Files.write(submodule, "[submodule ...".getBytes());
+
+        assertThat(isSubModule(submodule), is(true));
+        assertThat(isSubModule(blue), is(false));
+    }
+
     private static void readZipFileContent(Path zip, Consumer<Path> consumer) {
         try (FileSystem fs = newZipFileSystem(zip)) {
             Path root = fs.getRootDirectories().iterator().next();