Terraform - 如何将列表转换为 map（如何使用 terraform 获取 AMI 标签）

Question

I am trying to fetch the tags of AMI using AWS CLI and want to reuse the values from the output. I have a terraform code below which is returning outputs in string format(Maybe not sure of format) which I want to convert into a map object.

variable "ami" {
  default = "ami-xxxx"
}

locals {
  tags = {
  "platform"    = lookup(data.local_file.read_tags.content, "platform", "") #Expecting to get platform from Map of read_tags
  }
}

data "template_file" "log_name" {
  template = "${path.module}/output.log"
}

resource "null_resource" "ami_tags" {
  provisioner "local-exec" {
    command = "aws ec2 describe-tags --filters Name=resource-id,Values=${var.ami} --query Tags[*].[Key,Value] > ${data.template_file.log_name.rendered}"
  }
}

data "local_file" "read_tags" {
  filename = "${data.template_file.log_name.rendered}"
  depends_on = ["null_resource.ami_tags"]
}

output "tags" {
  value = local.tags
}

output "cli-output-tags" {
  value = "${concat(data.local_file.read_tags.content)}"
}

output of cli-output-tags is below:

[
    [
        "ENV",
        "DEV"
    ],
    [
        "Name",
        "Base-AMI"
    ],
    [
        "platform",
        "Linux"
    ]
]

How can I convert this output into Map as below using terraform/(jq command), or is there any other way to fetch required values directly from cli-output-tags output:

{
ENV  = "DEV",
Name = "Base-AMI",
platform = "Linux"
}

I have also tried changing the CLI command a bit like below but still not able to fetch values as expected:

'Tags[].{Key:Key,Value:Value}'

Resulted below output:

[
    {
        "Key": "ENV",
        "Value": "DEV"
    },
    {
        "Key": "Name",
        "Value": "Base-AMI"
    },
    {
        "Key": "platform",
        "Value": "Linux"
    }
]

Answer 1

You could use zipmap :

output "cli-output-tags" {
  value = zipmap(
        jsondecode(data.local_file.read_tags.content)[*][0],
        jsondecode(data.local_file.read_tags.content)[*][1]
      )         
}

The code first changes string data from your file to json, then gets all first elements [*][0] (same for second elements [*][1] ), and zips them into map.

Answer 2

How can I convert this output into Map as below

One way would be to use jq as follows (assuming cli-output-tags is the name of the file holding the JSON array of arrays):

jq -r -f '"{", (.[] | "\(.[0]) = \"\(.[1])\""), "}"' cli-output-tags