support for terraform created local_files in archive

Author: taylorludwig

README.md

@@ -26,6 +26,26 @@ The
 is a tested reference of how to use the root module with the
 [event-project-log-entry submodule][event-project-log-entry-submodule].
 
+## Terraform Created Source Files
+
+If you have `local_file` terraform resources that need to be included in the function's archive include them in the optional `source_dependent_files`.
+
+This will tell the module to wait until those files exist before creating the archive.
+
+Example can also be seen in `examples/dynamic-files`
+
+```hcl
+resource "local_file" "file" {
+  content  = "some content"
+  filename = "${path.module}/function_source/terraform_created_file.txt"
+}
+
+module "localhost_function" {
+  ...
+
+  source_dependent_files = [local_file.file]
+}
+```
 <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
 ## Inputs
 
@@ -46,6 +66,7 @@ is a tested reference of how to use the root module with the
 | region | The region in which resources will be applied. | string | n/a | yes |
 | runtime | The runtime in which the function will be executed. | string | n/a | yes |
 | service\_account\_email | The service account to run the function as. | string | `""` | no |
+| source\_dependent\_files | A list of any terraform created `local_file`s that the module will wait for before creating the archive. | object | `<list>` | no |
 | source\_directory | The pathname of the directory which contains the function source code. | string | n/a | yes |
 | timeout\_s | The amount of time in seconds allotted for the execution of the function. | number | `"60"` | no |
 

main.tf

@@ -14,10 +14,37 @@
  * limitations under the License.
  */
 
+
+/**
+* This allows users of the module to pass in any local_file resources
+* that we'll wait to exist before creating the archive.
+* This allows for us to delay the archive creation when terraform itself
+* is creating files. See this issue for more details
+* https://github.com/terraform-providers/terraform-provider-archive/issues/11
+*/
+resource "null_resource" "dependent_files" {
+  triggers = {
+    for file in var.source_dependent_files :
+    pathexpand(file.filename) => file.id
+  }
+}
+
+data "null_data_source" "wait_for_files" {
+  inputs = {
+    # This ensures that this data resource will not be evaluated until
+    # after the null_resource has been created.
+    dependent_files_id = "${null_resource.dependent_files.id}"
+
+    # This value gives us something to implicitly depend on
+    # in the archive_file below.
+    source_dir = pathexpand(var.source_directory)
+  }
+}
+
 data "archive_file" "main" {
   type        = "zip"
   output_path = pathexpand("${var.source_directory}.zip")
-  source_dir  = pathexpand(var.source_directory)
+  source_dir  = "${data.null_data_source.wait_for_files.outputs["source_dir"]}"
 }
 
 resource "google_storage_bucket" "main" {

variables.tf

@@ -73,6 +73,15 @@ variable "source_directory" {
   description = "The pathname of the directory which contains the function source code."
 }
 
+variable "source_dependent_files" {
+  type = list(object({
+    filename = string
+    id       = string
+  }))
+  description = "A list of any terraform created `local_file`s that the module will wait for before creating the archive."
+  default     = []
+}
+
 variable "timeout_s" {
   type        = number
   default     = 60