如何查找 Terraform 代码中未使用的所有 tf​​vars 变量的列表？

s3.tfvars

bucket = "first-bucket"
acl="private"
env = "dev"
owner = "[email protected] /cdn-cgi/l/email-protection"
var1 = "unused variable"

s3.tf

resource "aws_s3_bucket" "abucket" {
  bucket = var.bucket 
  acl = "private"

  tags = {
    Environment = var.env
    Owner = var.owner
  }
}

var1 没有在我的代码中使用，尽管它是在 tfvars 中声明的，如上所示。

当我运行以下命令时

terraform plan -var-file=s3.tfvars

...，我收到以下警告消息：

Warning: Value for undeclared variable

The root module does not declare a variable named "var1" but a value was
found in file "s3.tfvars". To use this value, add a "variable" block to the
configuration.

有没有办法将此警告捕获为错误？或者有没有其他方法可以找出所有未使用变量的列表？

你想使用tflint https://github.com/terraform-linters/tflint.

mkdir test/
cd test/
echo 'variable "what" {}' > main.tf

Add .tflint.hcl

rule "terraform_unused_declarations" {
  enabled = true
}

$ tflint --init
$ tflint
1 issue(s) found:

Warning: variable "what" is declared but not used (terraform_unused_declarations)

  on main.tf line 1:
   1: variable "what" {}

Reference: https://github.com/terraform-linters/tflint/blob/v0.28.1/docs/rules/terraform_unused_declarations.md