feat(terragrunt): add support for tfr prefix

lib/modules/manager/terragrunt/__fixtures__/1.hcl

@@ -0,0 +1,39 @@
+#real
+terraform {
+  extra_arguments "common_vars" {
+    commands = ["plan", "apply"]
+
+    arguments = [
+      "-var-file=../../common.tfvars",
+      "-var-file=../region.tfvars"
+    ]
+  }
+
+  before_hook "before_hook" {
+    commands     = ["apply", "plan"]
+    execute      = ["echo", "Running Terraform"]
+  }
+
+  source = "tfr:///myuser/myrepo//folder/modules/moduleone?ref=v0.0.9"
+
+  after_hook "after_hook" {
+    commands     = ["apply", "plan"]
+    execute      = ["echo", "Finished running Terraform"]
+    run_on_error = true
+  }
+}
+
+#submodule
+terraform {
+  source = "tfr:///terraform-google-modules/kubernetes-engine/google//modules/private-cluster?version=1.2.3"
+}
+
+#bar
+terraform {
+  source = "tfr:///terraform-aws-modules/vpc/aws?version=3.3.0"
+}
+
+#missing third backslash
+terraform {
+  source = "tfr://terraform-aws-modules/vpc/aws?version=3.3.0"
+}

lib/modules/manager/terragrunt/extract.spec.ts

@@ -7,6 +7,32 @@ describe('modules/manager/terragrunt/extract', () => {
       expect(extractPackageFile('nothing here')).toBeNull();
     });
 
+    it('extracts terragrunt sources using tfr protocol', () => {
+      const res = extractPackageFile(Fixtures.get('1.hcl'));
+      expect(res).toEqual({
+        deps: [
+          {
+            datasource: 'terraform-module',
+            depName: 'myuser/myrepo',
+            depType: 'terragrunt',
+          },
+          {
+            datasource: 'terraform-module',
+            depName: 'terraform-google-modules/kubernetes-engine/google',
+            depType: 'terragrunt',
+          },
+          {
+            datasource: 'terraform-module',
+            depName: 'terraform-aws-modules/vpc/aws',
+            depType: 'terragrunt',
+          },
+          {},
+        ],
+      });
+      expect(res?.deps).toHaveLength(4);
+      expect(res?.deps.filter((dep) => dep.skipReason)).toHaveLength(0);
+    });
+
     it('extracts terragrunt sources', () => {
       const res = extractPackageFile(Fixtures.get('2.hcl'));
       expect(res).toEqual({

lib/modules/manager/terragrunt/modules.ts

@@ -62,6 +62,10 @@ export function analyseTerragruntModule(
     const moduleParts = source.split('//')[0].split('/');
     if (moduleParts[0] === '..') {
       dep.skipReason = 'local';
+    } else if (source.startsWith('tfr:///')) {
+      dep.depType = 'terragrunt';
+      dep.depName = source.split('//')[1].split('?')[0].replace('/', '');
+      dep.datasource = TerraformModuleDatasource.id;
     } else if (moduleParts.length >= 3) {
       const hostnameMatch = hostnameMatchRegex.exec(source);
       if (hostnameMatch?.groups) {