Support *.tofu and .*tofu.json file detection

cli/commands/run/errors.go

@@ -39,7 +39,7 @@ func (err BackendNotDefined) Error() string {
 type NoTerraformFilesFound string
 
 func (path NoTerraformFilesFound) Error() string {
-	return "Did not find any Terraform files (*.tf) in " + string(path)
+	return "Did not find any Terraform files (*.tf) or OpenTofu files (*.tofu) in " + string(path)
 }
 
 type ModuleIsProtected struct {

cli/commands/run/run.go

@@ -540,13 +540,27 @@ func CheckFolderContainsTerraformCode(terragruntOptions *options.TerragruntOptio
 
 	files = append(files, hclFiles...)
 
+	tofuHclFiles, err := zglob.Glob(terragruntOptions.WorkingDir + "/**/*.tofu")
+	if err != nil {
+		return errors.New(err)
+	}
+
+	files = append(files, tofuHclFiles...)
+
 	jsonFiles, err := zglob.Glob(terragruntOptions.WorkingDir + "/**/*.tf.json")
 	if err != nil {
 		return errors.New(err)
 	}
 
 	files = append(files, jsonFiles...)
 
+	tofuJSONFiles, err := zglob.Glob(terragruntOptions.WorkingDir + "/**/*.tofu.json")
+	if err != nil {
+		return errors.New(err)
+	}
+
+	files = append(files, tofuJSONFiles...)
+
 	if len(files) == 0 {
 		return errors.New(NoTerraformFilesFound(terragruntOptions.WorkingDir))
 	}

cli/commands/run/run_test.go

@@ -96,13 +96,33 @@ func TestTerragruntTerraformCodeCheck(t *testing.T) {
 			workingDir:  "test-fixtures/dir-with-terraform",
 			valid:       true,
 		},
+		{
+			description: "Directory with plain OpenTofu",
+			workingDir:  "test-fixtures/dir-with-tofu",
+			valid:       true,
+		},
+		{
+			description: "Directory with plain Terraform and OpenTofu",
+			workingDir:  "test-fixtures/dir-with-terraform-and-tofu",
+			valid:       true,
+		},
 		{
 			description: "Directory with JSON formatted Terraform",
 			workingDir:  "test-fixtures/dir-with-terraform-json",
 			valid:       true,
 		},
 		{
-			description: "Directory with no Terraform",
+			description: "Directory with JSON formatted OpenTofu",
+			workingDir:  "test-fixtures/dir-with-tofu-json",
+			valid:       true,
+		},
+		{
+			description: "Directory with JSON formatted Terraform and OpenTofu",
+			workingDir:  "test-fixtures/dir-with-terraform-and-tofu-json",
+			valid:       true,
+		},
+		{
+			description: "Directory with no Terraform or OpenTofu",
 			workingDir:  "test-fixtures/dir-with-no-terraform",
 			valid:       false,
 		},