Fixed auto-detect Terragrunt dependencies from read_terragrunt_config calls in locals blocks

go.work.sum

@@ -947,6 +947,7 @@ github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSV
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f h1:lBNOc5arjvs8E5mO2tbpBpLoyyu8B6e44T7hJy6potg=
 github.com/cpuguy83/go-md2man v1.0.10 h1:BSKMNlYxDvnunlTymqtgONjNnaRV1sTpcovwwjF22jk=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v0.0.0-20161028175848-04cdfd42973b/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0-20210816181553-5444fa50b93d h1:1iy2qD6JEhHKKhUOA9IWs7mjco7lnw2qx8FsRI2wirE=
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0-20210816181553-5444fa50b93d/go.mod h1:tmAIfUFEirG/Y8jhZ9M+h36obRZAk/1fcSpXwAVlfqE=
@@ -1100,6 +1101,7 @@ github.com/google/go-pkcs11 v0.3.0/go.mod h1:6eQoGcuNJpa7jnd5pMGdkSaQpNDYvPlXWMc
 github.com/google/pprof v0.0.0-20210720184732-4bb14d4b1be1 h1:K6RDEckDVWvDI9JAJYCmNdQXq6neHJOYx3V6jnqNEec=
 github.com/google/renameio v0.1.0 h1:GOZbcHa3HfsPKPlmyPyN2KEohoMXOhdMbHrvbpl2QaA=
 github.com/google/uuid v1.4.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/cloud-bigtable-clients-test v0.0.2 h1:S+sCHWAiAc+urcEnvg5JYJUOdlQEm/SEzQ/c/IdAH5M=
 github.com/googleapis/cloud-bigtable-clients-test v0.0.2/go.mod h1:mk3CrkrouRgtnhID6UZQDK3DrFFa7cYCAJcEmNsHYrY=
 github.com/googleapis/enterprise-certificate-proxy v0.3.3/go.mod h1:YKe7cfqYXjKGpGvmSg28/fFvhNzinZQm8DGnaburhGA=
@@ -1462,6 +1464,7 @@ github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B
 github.com/spf13/afero v1.10.0/go.mod h1:UBogFpq8E9Hx+xc5CNTTEpTnuHVmXDwZcZcE1eb/UhQ=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
 github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tLCHU=
+github.com/spf13/cobra v1.8.0/go.mod h1:WXLWApfZ71AjXPya3WOlMsY9yMs7YeiHhFVlvLyhcho=
 github.com/spf13/jwalterweatherman v0.0.0-20180109140146-7c0cea34c8ec h1:2ZXvIUGghLpdTVHR1UfvfrzoVlZaE/yOWC5LueIHZig=
 github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9Gc1vn7yk=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=

libs/digger_config/terragrunt/tac/parse_locals.go

@@ -13,6 +13,7 @@ import (
 	"github.com/hashicorp/hcl/v2/hclparse"
 	"github.com/zclconf/go-cty/cty"
 	"log/slog"
+	"regexp"
 
 	"path/filepath"
 )
@@ -41,6 +42,24 @@ type ResolvedLocals struct {
 	markedProject *bool
 }
 
+// detectReadTerragruntConfigDependencies scans HCL content for read_terragrunt_config calls
+// and extracts file paths from find_in_parent_folders() function calls
+func detectReadTerragruntConfigDependencies(hclContent string) []string {
+	var dependencies []string
+
+	// Pattern to match read_terragrunt_config(find_in_parent_folders("filename"))
+	readTerragruntConfigPattern := regexp.MustCompile(`read_terragrunt_config\s*\(\s*find_in_parent_folders\s*\(\s*["\']([^"\']+)["\']\s*\)\s*\)`)
+
+	matches := readTerragruntConfigPattern.FindAllStringSubmatch(hclContent, -1)
+	for _, match := range matches {
+		if len(match) > 1 {
+			dependencies = append(dependencies, match[1])
+		}
+	}
+
+	return dependencies
+}
+
 // parseHcl uses the HCL2 parser to parse the given string into an HCL file body.
 func parseHcl(parser *hclparse.Parser, hcl string, filename string) (file *hcl.File, err error) {
 
@@ -123,6 +142,9 @@ func parseLocals(path string, terragruntOptions *options.TerragruntOptions, incl
 	localsAsCty := extensions.Locals
 	trackInclude := extensions.TrackInclude
 
+	// Detect read_terragrunt_config dependencies from raw HCL content
+	autoDetectedDependencies := detectReadTerragruntConfigDependencies(configString)
+
 	// Recurse on the parent to merge in the locals from that file
 	mergedParentLocals := ResolvedLocals{}
 	if trackInclude != nil && includeFromChild == nil {
@@ -131,12 +153,12 @@ func parseLocals(path string, terragruntOptions *options.TerragruntOptions, incl
 			mergedParentLocals = mergeResolvedLocals(mergedParentLocals, parentLocals)
 		}
 	}
-	childLocals := resolveLocals(*localsAsCty)
+	childLocals := resolveLocals(*localsAsCty, autoDetectedDependencies)
 
 	return mergeResolvedLocals(mergedParentLocals, childLocals), nil
 }
 
-func resolveLocals(localsAsCty cty.Value) ResolvedLocals {
+func resolveLocals(localsAsCty cty.Value, autoDetectedDependencies []string) ResolvedLocals {
 	resolved := ResolvedLocals{}
 
 	// Return an empty set of locals if no `locals` block was present
@@ -195,5 +217,13 @@ func resolveLocals(localsAsCty cty.Value) ResolvedLocals {
 		}
 	}
 
+	// Add auto-detected dependencies from read_terragrunt_config calls
+	for _, dep := range autoDetectedDependencies {
+		resolved.ExtraDiggerDependencies = append(
+			resolved.ExtraDiggerDependencies,
+			filepath.ToSlash(dep),
+		)
+	}
+
 	return resolved
 }

libs/digger_config/terragrunt/tac/parse_locals_test.go

@@ -0,0 +1,68 @@
+package tac
+
+import (
+	"testing"
+)
+
+func TestDetectReadTerragruntConfigDependencies(t *testing.T) {
+	tests := []struct {
+		name     string
+		hclContent string
+		expected []string
+	}{
+		{
+			name: "single read_terragrunt_config call",
+			hclContent: `
+locals {
+  project_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))
+  staff_vars   = read_terragrunt_config(find_in_parent_folders("data/staff.hcl"))
+}`,
+			expected: []string{"region.hcl", "data/staff.hcl"},
+		},
+		{
+			name: "mixed with other locals",
+			hclContent: `
+locals {
+  project_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))
+  environment = "dev"
+  staff_vars   = read_terragrunt_config(find_in_parent_folders("data/staff.hcl"))
+}`,
+			expected: []string{"region.hcl", "data/staff.hcl"},
+		},
+		{
+			name: "no read_terragrunt_config calls",
+			hclContent: `
+locals {
+  environment = "dev"
+  region = "us-east-1"
+}`,
+			expected: []string{},
+		},
+		{
+			name: "with extra_digger_dependencies",
+			hclContent: `
+locals {
+  extra_digger_dependencies = [
+    "some-file.hcl"
+  ]
+  project_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))
+}`,
+			expected: []string{"region.hcl"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := detectReadTerragruntConfigDependencies(tt.hclContent)
+			if len(result) != len(tt.expected) {
+				t.Errorf("Expected %d dependencies, got %d: %v", len(tt.expected), len(result), result)
+				return
+			}
+			for i, expected := range tt.expected {
+				if i >= len(result) || result[i] != expected {
+					t.Errorf("Expected dependency %d to be %q, got %q", i, expected, result[i])
+				}
+			}
+		})
+	}
+}

libs/go.sum

@@ -777,35 +777,53 @@ github.com/aws/aws-sdk-go v1.44.122/go.mod h1:y4AeaBuwd2Lk+GepC1E9v0qOiTws0MIWAX
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@@ -1036,6 +1054,7 @@ github.com/golang-jwt/jwt/v4 v4.5.0/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w
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