fix panic for list variables

pkg/iac-providers/terraform/v12/cty-converters.go

@@ -18,6 +18,8 @@ package tfv12
 
 import (
 	"fmt"
+	"strings"
+
 	"github.com/pkg/errors"
 	"github.com/zclconf/go-cty/cty"
 	"github.com/zclconf/go-cty/cty/gocty"
@@ -26,7 +28,7 @@ import (
 // list of available cty to golang type converters
 var (
 	ctyConverterFuncs       = []func(cty.Value) (interface{}, error){ctyToStr, ctyToInt, ctyToBool, ctyToSlice, ctyToMap}
-	ctyNativeConverterFuncs = []func(cty.Value) (interface{}, error){ctyToStr, ctyToInt, ctyToBool, ctyToSlice}
+	ctyNativeConverterFuncs = []func(cty.Value) (interface{}, error){ctyToStr, ctyToInt, ctyToBool}
 )
 
 // ctyToStr tries to convert the given cty.Value into golang string type
@@ -54,8 +56,25 @@ func ctyToBool(ctyVal cty.Value) (interface{}, error) {
 // interfce{}
 func ctyToSlice(ctyVal cty.Value) (interface{}, error) {
 	var val []interface{}
-	err := gocty.FromCtyValue(ctyVal, &val)
-	return val, err
+	var allErrs error
+
+	if strings.Contains(ctyVal.Type().FriendlyName(), "list") {
+		for _, v := range ctyVal.AsValueSlice() {
+			for _, converter := range ctyNativeConverterFuncs {
+				resolved, err := converter(v)
+				if err == nil {
+					val = append(val, resolved)
+					break
+				}
+				allErrs = errors.Wrap(allErrs, err.Error())
+			}
+		}
+		if allErrs != nil {
+			return nil, allErrs
+		}
+		return val, nil
+	}
+	return val, fmt.Errorf("incorrect type")
 }
 
 // ctyToMap tries to converts the incoming cty.Value into map[string]cty.Value

pkg/iac-providers/terraform/v12/load-dir_test.go

@@ -138,6 +138,13 @@ func TestLoadIacDir(t *testing.T) {
 			tfv12:       TfV12{},
 			wantErr:     nil,
 		},
+		{
+			name:        "variables of list type",
+			tfConfigDir: "./testdata/list-type-vars-test",
+			tfJSONFile:  "./testdata/tfjson/list-vars-test.json",
+			tfv12:       TfV12{},
+			wantErr:     nil,
+		},
 	}
 
 	for _, tt := range table2 {

pkg/iac-providers/terraform/v12/testdata/list-type-vars-test/main.tf

@@ -0,0 +1,15 @@
+data "aws_ami" "amazon_linux" {
+  most_recent = true
+}
+
+resource "aws_instance" "app" {
+  count = var.instance_count
+
+  ami           = data.aws_ami.amazon_linux.id
+  instance_type = var.instance_type
+
+  subnet_id              = var.subnet_ids[count.index % length(var.subnet_ids)]
+  vpc_security_group_ids = var.security_group_ids
+
+  tags = var.tags
+}

pkg/iac-providers/terraform/v12/testdata/list-type-vars-test/variables.tf

@@ -0,0 +1,31 @@
+variable "instance_count" {
+  description = "Number of EC2 instances to deploy"
+  type        = list(number)
+  default = [1,2]
+}
+
+variable "instance_type" {
+  description = "Type of EC2 instance to use"
+  type        = string
+  default = "blah_instance"
+}
+
+variable "subnet_ids" {
+  description = "Subnet IDs for EC2 instances"
+  type        = list(string)
+  default = ["10.0.0.0/8"]
+}
+
+variable "security_group_ids" {
+  description = "Security group IDs for EC2 instances"
+  type        = list(string)
+}
+
+variable "tags" {
+  description = "Tags for instances"
+  type        = map
+  default     = {
+    "a" = "b"
+    "c" = "d"
+  }
+}

pkg/iac-providers/terraform/v12/testdata/tfjson/list-vars-test.json

@@ -0,0 +1,28 @@
+{
+  "aws_instance": [
+    {
+      "id": "aws_instance.app",
+      "name": "app",
+      "source": "main.tf",
+      "line": 5,
+      "type": "aws_instance",
+      "config": {
+        "ami": "${data.aws_ami.amazon_linux.id}",
+        "count": [
+          1,
+          2
+        ],
+        "instance_type": "blah_instance",
+        "subnet_id": [
+          "10.0.0.0/8"
+        ],
+        "tags": {
+          "a": "b",
+          "c": "d"
+        },
+        "vpc_security_group_ids": "${var.security_group_ids}"
+      },
+      "skip_rules": null
+    }
+  ]
+}