resourceop tf: support ${telophase.region} replacement in tf

This supports using the telophase.region when Region is set on a
terraform stack

examples/localstack/tf/workspace/main.tf

@@ -18,7 +18,7 @@ locals {
 
 provider "aws" {
     # Two options can use ${telophase.region} or look at local config
-    region = local.region
+    region = "${telophase.region}" 
 }
 
 terraform {

lib/terraform/local.go

@@ -24,12 +24,12 @@ func TmpPath(acct resource.Account, filePath string) string {
 	return path.Join("telophasedirs", fmt.Sprintf("tf-tmp%s-%s", acct.ID(), hashString))
 }
 
-func CopyDir(src string, dst string, resource resource.Resource) error {
+func CopyDir(stack resource.Stack, dst string, resource resource.Resource) error {
 	ignoreDir := "telophasedirs"
 
-	abs, err := filepath.Abs(src)
+	abs, err := filepath.Abs(stack.Path)
 	if err != nil {
-		return oops.Wrapf(err, "could not get absolute file path for path: %s", src)
+		return oops.Wrapf(err, "could not get absolute file path for path: %s", stack.Path)
 	}
 	return filepath.Walk(abs, func(path string, info fs.FileInfo, err error) error {
 		if err != nil {
@@ -46,12 +46,12 @@ func CopyDir(src string, dst string, resource resource.Resource) error {
 		if info.IsDir() {
 			return os.MkdirAll(targetPath, info.Mode())
 		} else {
-			return replaceVariablesInFile(path, targetPath, resource)
+			return replaceVariablesInFile(path, targetPath, resource, stack)
 		}
 	})
 }
 
-func replaceVariablesInFile(srcFile, dstFile string, resource resource.Resource) error {
+func replaceVariablesInFile(srcFile, dstFile string, resource resource.Resource, stack resource.Stack) error {
 	content, err := ioutil.ReadFile(srcFile)
 	if err != nil {
 		return err
@@ -68,5 +68,13 @@ func replaceVariablesInFile(srcFile, dstFile string, resource resource.Resource)
 	updatedContent = strings.ReplaceAll(updatedContent, "${telophase.resource_name}", resource.Name())
 	updatedContent = strings.ReplaceAll(updatedContent, "telophase.resource_name", fmt.Sprintf("\"%s\"", resource.Name()))
 
+	// Update Region
+	preRegionContent := updatedContent
+	updatedContent = strings.ReplaceAll(updatedContent, "${telophase.region}", stack.Region)
+	updatedContent = strings.ReplaceAll(updatedContent, "telophase.region", stack.Region)
+	if updatedContent != preRegionContent && stack.Region == "" {
+		return oops.Errorf("Region needs to be set on stack if performing substitution")
+	}
+
 	return ioutil.WriteFile(dstFile, []byte(updatedContent), 0644)
 }

resourceoperation/scp.go

@@ -190,7 +190,7 @@ func (so *scpOperation) initTf() (*exec.Cmd, error) {
 			return nil, fmt.Errorf("failed to create directory %s: %v", terraformDir, err)
 		}
 
-		if err := terraform.CopyDir(so.Stack.Path, workingPath, so.targetResource()); err != nil {
+		if err := terraform.CopyDir(so.Stack, workingPath, so.targetResource()); err != nil {
 			return nil, fmt.Errorf("failed to copy files from %s to %s: %v", so.Stack.Path, workingPath, err)
 		}
 

resourceoperation/terraform.go

@@ -131,7 +131,7 @@ func (to *tfOperation) initTf(role *sts.AssumeRoleOutput) *exec.Cmd {
 			return nil
 		}
 
-		if err := terraform.CopyDir(to.Stack.Path, workingPath, *to.Account); err != nil {
+		if err := terraform.CopyDir(to.Stack, workingPath, *to.Account); err != nil {
 			to.OutputUI.Print(fmt.Sprintf("Error: failed to copy files from %s to %s: %v", to.Stack.Path, workingPath, err), *to.Account)
 			return nil
 		}