feat: improve error message for invalid extra atlantis dependencies

cmd/generate_test.go

@@ -168,6 +168,28 @@ func TestExtraDeclaredDependencies(t *testing.T) {
 	})
 }
 
+func TestNonStringErrorOnExtraDeclaredDependencies(t *testing.T) {
+	err := resetForRun()
+	if err != nil {
+		t.Error("Failed to reset default flags")
+		return
+	}
+
+	rootCmd.SetArgs([]string{
+		"generate",
+		"--root",
+		filepath.Join("..", "test_examples_errors", "extra_dependency_error"),
+	})
+	err = rootCmd.Execute()
+
+	expectedError := "extra_atlantis_dependencies contains non-string value at position 4"
+	if err == nil || err.Error() != expectedError {
+		t.Errorf("Expected error '%s', got '%v'", expectedError, err)
+		return
+	}
+	return
+}
+
 func TestLocalTerraformModuleSource(t *testing.T) {
 	runTest(t, filepath.Join("golden", "local_terraform_module.yaml"), []string{
 		"--root",

cmd/parse_locals.go

@@ -12,7 +12,8 @@ import (
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hclparse"
 	"github.com/zclconf/go-cty/cty"
-
+
+	"fmt"
 	"path/filepath"
 )
 
@@ -126,17 +127,19 @@ func parseLocals(path string, terragruntOptions *options.TerragruntOptions, incl
 			mergedParentLocals = mergeResolvedLocals(mergedParentLocals, parentLocals)
 		}
 	}
-	childLocals := resolveLocals(*localsAsCty)
-
+	childLocals, err := resolveLocals(*localsAsCty)
+	if err != nil {
+		return ResolvedLocals{}, err
+	}
 	return mergeResolvedLocals(mergedParentLocals, childLocals), nil
 }
 
-func resolveLocals(localsAsCty cty.Value) ResolvedLocals {
+func resolveLocals(localsAsCty cty.Value) (ResolvedLocals,error) {
 	resolved := ResolvedLocals{}
 
 	// Return an empty set of locals if no `locals` block was present
 	if localsAsCty == cty.NilVal {
-		return resolved
+		return resolved, nil
 	}
 	rawLocals := localsAsCty.AsValueMap()
 
@@ -182,13 +185,18 @@ func resolveLocals(localsAsCty cty.Value) ResolvedLocals {
 	if ok {
 		it := extraDependenciesAsCty.ElementIterator()
 		for it.Next() {
-			_, val := it.Element()
+			pos, val := it.Element()
+			if !val.Type().Equals(cty.String) {
+				posInt, _ := pos.AsBigFloat().Int64()
+				return resolved, fmt.Errorf("extra_atlantis_dependencies contains non-string value at position %d", posInt)
+			}
+
 			resolved.ExtraAtlantisDependencies = append(
 				resolved.ExtraAtlantisDependencies,
 				filepath.ToSlash(val.AsString()),
 			)
 		}
 	}
 
-	return resolved
+	return resolved, nil
 }

test_examples_errors/extra_dependency_error/child/terragrunt.hcl

@@ -0,0 +1,15 @@
+terraform {
+  source = "git::git@github.com:transcend-io/terraform-aws-fargate-container?ref=v0.0.4"
+}
+
+locals {
+  tg_config = read_terragrunt_config(find_in_parent_folders("config.hcl"))
+
+  extra_atlantis_dependencies = [
+    "some_extra_dep0",
+    "some_extra_dep1",
+    "some_extra_dep2",
+    "some_extra_dep3",
+    local.tg_config
+  ]
+}

test_examples_errors/extra_dependency_error/config.hcl

@@ -0,0 +1,3 @@
+locals {
+  aws_account_id = "111131111219"
+}