terraform/aws: Add a script to generate the Kconfig.instance menus

Enable kdevops to quickly pick up new instance families and types
whenever they are introduced by AWS.

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.

This implementation is still missing information which can be
retrieved via the 'pricing' API.

To use:

  $ terraform/aws/scripts/gen_kconfig_instance >
        terraform/aws/kconfigs/Kconfig.instance

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

Author: chucklever

terraform/aws/scripts/families.j2

@@ -0,0 +1,28 @@
+choice
+	prompt "Instance family"
+	help
+	  Instance families comprise varying combinations of
+	  hardware platform, CPU count, memory size, storage, and
+	  networking capacity. Select the type that provides an
+	  appropriate mix of resources for your preferred workflows.
+
+	  Some instance types are region- and capacity-limited.
+
+	  See https://aws.amazon.com/ec2/instance-types/ for
+	  details.
+
+{% for family in sorted_families %}
+config TERRAFORM_AWS_INSTANCE_FAMILY_{{ family['family_name'].upper().replace('-', '_') }}
+	bool "{{ family['family_name'] }}"
+{% if 'x86_64' in family['architectures'] %}
+	depends on TARGET_ARCH_X86_64
+{% endif %}
+{% if 'arm64' in family['architectures'] %}
+	depends on TARGET_ARCH_ARM64
+{% endif %}
+	help
+	  See https://aws.amazon.com/ec2/instance-types/{{ family['family_name'] }}/ for
+	  details.
+
+{% endfor %}
+endchoice

terraform/aws/scripts/family.j2

@@ -0,0 +1,45 @@
+if TERRAFORM_AWS_INSTANCE_FAMILY_{{ family_name }}
+
+choice
+	prompt "Instance type"
+	default TERRAFORM_AWS_INSTANCE_SIZE_{{ instances[0]['instance_type'].upper().replace('-', '_').replace('.', '_') }}
+	help
+	  Add storage by increasing the number of EBS volumes per
+	  instance.
+
+{% for instance in instances %}
+config TERRAFORM_AWS_INSTANCE_SIZE_{{ instance['instance_type'].upper().replace('-', '_').replace('.', '_') }}
+	bool "{{ instance['instance_type'] }}"
+{% if 'x86_64' in instance['cpu_isa'] %}
+	depends on TARGET_ARCH_X86_64
+{% elif 'arm64' in instance['cpu_isa'] %}
+	depends on TARGET_ARCH_ARM64
+{% endif %}
+	help
+	  vCPU count: {{ instance['vcpus'] }}
+	  RAM: {{ instance['memory_gb'] }} GiB
+	  Network speed: {{ instance['network_performance'] }}
+{% if instance['storage'] != 'EBS-only' %}
+	  Additional storage: {{ instance['storage'] }}
+{% endif %}
+{% if instance['gpu'] != 'None' %}
+	  GPU: {{ instance['gpu'] }}
+{% endif %}
+{% if instance['bare_metal'] %}
+	  Bare metal instance.
+{% endif %}
+{% if instance['free_tier'] %}
+	  Free tier eligible.
+{% endif %}
+
+{% endfor %}
+endchoice
+
+config TERRAFORM_AWS_INSTANCE_TYPE
+	string
+	output yaml
+{% for instance in instances %}
+	default "{{ instance['instance_type'] }}" if TERRAFORM_AWS_INSTANCE_SIZE_{{ instance['instance_type'].upper().replace('-', '_').replace('.', '_') }}
+{% endfor %}
+
+endif # TERRAFORM_AWS_INSTANCE_FAMILY_{{ family_name }}