AL1 changes (aws#6)

- make separate config variables for AL1 docker and ecs versions
- install ecs-init package from AL yum repos
- overwrite the AL login banner with ecs's banner

al1.pkr.hcl

@@ -59,8 +59,8 @@ build {
   provisioner "shell" {
     inline_shebang = "/bin/sh -ex"
     inline = [
-      "sudo mv /tmp/ecs-custom-motd /etc/update-motd.d/ecs-custom-motd",
-      "sudo chmod 755 /etc/update-motd.d/ecs-custom-motd"
+      "sudo mv /tmp/ecs-custom-motd /etc/update-motd.d/30-banner",
+      "sudo chmod 755 /etc/update-motd.d/30-banner"
     ]
   }
 
@@ -79,15 +79,10 @@ build {
   provisioner "shell" {
     inline_shebang = "/bin/sh -ex"
     inline = [
-      "sudo yum install -y docker-${var.docker_version} ${local.packages} docker-storage-setup"
+      "sudo yum install -y docker-${var.docker_version_al1} ecs-init-${var.ecs_version_al1} ${local.packages} docker-storage-setup"
     ]
   }
 
-  provisioner "shell" {
-    script           = "scripts/install-ecs-init.sh"
-    environment_vars = ["REGION=${var.region}", "AGENT_VERSION=${var.ecs_agent_version}", "INIT_REV=${var.ecs_init_rev}", "AL_NAME=amzn1"]
-  }
-
   provisioner "shell" {
     script = "scripts/install-additional-packages.sh"
   }

files/al1/ecs-custom-motd

@@ -1,6 +1,6 @@
 echo -e "
    __|  __|  __|
-   _|  (   \__ \   Amazon ECS-Optimized
+   _|  (   \__ \   Amazon ECS-Optimized Amazon Linux AMI
  ____|\___|____/
 
 For documentation, visit http://aws.amazon.com/documentation/ecs"

variables.pkr.hcl

@@ -82,6 +82,18 @@ variable "source_ami_al1" {
   description = "Amazon Linux 1 source AMI to build from."
 }
 
+variable "docker_version_al1" {
+  type        = string
+  description = "Docker version to build AL1 AMI with."
+  default     = "20.10.7"
+}
+
+variable "ecs_version_al1" {
+  type        = string
+  description = "ECS version to build AL1 AMI with."
+  default     = "1.51.0"
+}
+
 variable "air_gapped" {
   type        = string
   description = "If this build is for an air-gapped region, set to 'true'"