terraform/aws: Add a script to generate the Kconfig.ami menu

Enable kdevops to quickly pick up new Linux distributions whenever
they are introduced by AWS or in the marketplace.

boto3 reuses connections to the API endpoint, making the generation
of the Kconfig menu quick. Jinja2 lets us manage a large amount of
bespoke Kconfig help text painlessly. The new script reports some
basic authentication issues and has a "raw" output to enable
troubleshooting.

To use:

  $ terraform/aws/scripts/gen_kconfig_ami >
        terraform/aws/kconfigs/Kconfig.ami

Signed-off-by: Chuck Lever <[email protected]>

Author: chucklever

playbooks/roles/gen_tfvars/templates/aws/terraform.tfvars.j2

@@ -3,6 +3,7 @@ aws_region = "{{ terraform_aws_region }}"
 aws_availability_zone = "{{ terraform_aws_av_zone }}"
 aws_name_search = "{{ terraform_aws_ns }}"
 aws_ami_owner = "{{ terraform_aws_ami_owner }}"
+aws_ami_arch = "{{ terraform_aws_ami_arch }}"
 aws_instance_type = "{{ terraform_aws_instance_type }}"
 aws_ebs_volumes_per_instance = "{{ terraform_aws_ebs_volumes_per_instance }}"
 aws_ebs_volume_size = {{ terraform_aws_ebs_volume_size }}

terraform/aws/kconfigs/Kconfig.compute

@@ -26,6 +26,12 @@ config TERRAFORM_AWS_DISTRO_CUSTOM
 
 endchoice
 
+config TERRAFORM_AWS_AMI_ARCH
+	string
+	output yaml
+	default "x86_64" if TARGET_ARCH_X86_64
+	default "arm64" if TARGET_ARCH_ARM64
+
 source "terraform/aws/kconfigs/distros/Kconfig.amazon"
 source "terraform/aws/kconfigs/distros/Kconfig.debian"
 source "terraform/aws/kconfigs/distros/Kconfig.fedora"

terraform/aws/main.tf

@@ -1,14 +1,23 @@
 data "aws_ami" "kdevops_ami" {
   most_recent = true
+  owners      = [var.aws_ami_owner]
+
+  filter {
+    name   = "architecture"
+    values = [var.aws_ami_arch]
+  }
   filter {
     name   = "name"
     values = [var.aws_name_search]
   }
+  filter {
+    name   = "state"
+    values = ["available"]
+  }
   filter {
     name   = "virtualization-type"
     values = ["hvm"]
   }
-  owners = [var.aws_ami_owner]
 }
 
 resource "aws_vpc" "kdevops_vpc" {

terraform/aws/scripts/distro.j2

@@ -0,0 +1,28 @@
+if TERRAFORM_AWS_DISTRO_{{ owner_name }}
+
+choice
+	prompt "Release"
+	help
+	  Choose a specific release from the {{ owner_description }}
+	  distribution.
+
+{% for name, info in discovered %}
+config TERRAFORM_AWS_AMI_{{ name.upper().replace(' ', '_').replace('.', '_') }}
+	bool "{{ name }}"
+
+{% endfor %}
+endchoice
+
+config TERRAFORM_AWS_AMI_OWNER
+	string
+	output yaml
+	default "{{ owner_id }}"
+
+config TERRAFORM_AWS_NS
+	string
+	output yaml
+{% for name, info in discovered %}
+	default "{{ info['terraform_filter'] }}" if TERRAFORM_AWS_AMI_{{ name.upper().replace(' ', '_').replace('.', '_') }}
+{% endfor %}
+
+endif # TERRAFORM_AWS_DISTRO_{{ owner_name }}