add interpreter option to wait_for_cluster_cmd

CHANGELOG.md

@@ -9,7 +9,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [[v10.?.?](https://github.com/terraform-aws-modules/terraform-aws-eks/compare/v10.0.0...HEAD)] - 2020-xx-xx
 
-- Write your awesome change here (GH-xxxx)
+- Allow to configure interpreter for the `wait_for_cluster_cmd` command (by @avoidik)
 
 ## History
 

README.md

@@ -198,6 +198,7 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 | tags | A map of tags to add to all resources. | `map(string)` | `{}` | no |
 | vpc\_id | VPC where the cluster and workers will be deployed. | `string` | n/a | yes |
 | wait\_for\_cluster\_cmd | Custom local-exec command to execute for determining if the eks cluster is healthy. Cluster endpoint will be available as an environment variable called ENDPOINT | `string` | `"until wget --no-check-certificate -O - -q $ENDPOINT/healthz \u003e/dev/null; do sleep 4; done"` | no |
++| wait\_for\_cluster\_interpreter | Custom local-exec command line interpreter for the command to determining if the eks cluster is healthy. | `list(string)` | <pre>[<br>  "/bin/sh",<br>  "-c"<br>]</pre> | no |
 | worker\_additional\_security\_group\_ids | A list of additional security group ids to attach to worker instances | `list(string)` | `[]` | no |
 | worker\_ami\_name\_filter | Name filter for AWS EKS worker AMI. If not provided, the latest official AMI for the specified 'cluster\_version' is used. | `string` | `""` | no |
 | worker\_ami\_name\_filter\_windows | Name filter for AWS EKS Windows worker AMI. If not provided, the latest official AMI for the specified 'cluster\_version' is used. | `string` | `""` | no |

cluster.tf

@@ -53,7 +53,8 @@ resource "null_resource" "wait_for_cluster" {
   ]
 
   provisioner "local-exec" {
-    command = var.wait_for_cluster_cmd
+    command     = var.wait_for_cluster_cmd
+    interpreter = var.wait_for_cluster_interpreter
     environment = {
       ENDPOINT = aws_eks_cluster.this[0].endpoint
     }

variables.tf

@@ -204,6 +204,12 @@ variable "wait_for_cluster_cmd" {
   default     = "until wget --no-check-certificate -O - -q $ENDPOINT/healthz >/dev/null; do sleep 4; done"
 }
 
+variable "wait_for_cluster_interpreter" {
+  description = "Custom local-exec command line interpreter for the command to determining if the eks cluster is healthy."
+  type        = list(string)
+  default     = ["/bin/sh", "-c"]
+}
+
 variable "cluster_create_security_group" {
   description = "Whether to create a security group for the cluster or attach the cluster to `cluster_security_group_id`."
   type        = bool