Lambda build module can't find python interpreter even though it is installed

[willkara]

Description

I am trying to use the terraform-aws-modules/lambda/aws module for a basic lambda function build. I've confirmed Python 3.9 is on my system path, but the module keeps failing.

So, as you can see, I clearly have Python 3.9.0 on the path. The module isn't finding it for some reason.

• [x] ✋ I have searched the open/closed issues and my issue is not listed.

⚠️ Note

Before you submit an issue, please perform the following first:

Versions

• Module version [Required]:

• Terraform version: v1.3.1 on windows_amd64

• Provider version(s):

  • aws >=4.9.0
  • external >=1.0.0
  • local >=1.0.0
  • null >= 2.0.0

Reproduction Code [Required]

Steps to reproduce the behavior:

module "lambda_function" {

  source = "terraform-aws-modules/lambda/aws"

  function_name = "my-lambda1"
  description   = "My awesome lambda function"
  handler       = "index.lambda_handler"
  runtime       = "python3.9"

  source_path = "./samp"

  tags = {
    Name = "my-lambda1"
  }
}

Expected behavior

Lambda function builds

Actual behavior

Program: C:\Users\e349068\AppData\Local\Programs\Python\Python39\python.exe

│ Error Message: Traceback (most recent call last): │ File "C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package.terraform\modules\lambda_function\package.py", line 1632, in │ main() │ File "C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package.terraform\modules\lambda_function\package.py", line 1628, in main │ exit(args.command(args)) │ File "C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package.terraform\modules\lambda_function\package.py", line 1427, in prepare_command │ build_plan = bpm.plan(source_path, query) │ File "C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package.terraform\modules\lambda_function\package.py", line 773, in plan │ pip_requirements_step( │ File "C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package.terraform\modules\lambda_function\package.py", line 675, in pip_requirements_step │ raise RuntimeError( │ RuntimeError: Python interpreter version equal to defined lambda runtime (python3.9) should be available in system PATH │ │ State: exit status 1

PS C:\Users\e349068\source\repos\terraform-aws-lambda\examples\build-package> python --version

Python 3.9.0

[donsokolone]

I ran into same problem and the root cause is that lambda module will look for python3.9.exe in your PATH when runtime = "python3.9" is set. Copying/linking to python.exe fixed this problem for me.

[antonbabenko]

Yes.

https://github.com/terraform-aws-modules/terraform-aws-lambda/blob/da9b781dea7d9b52cdbad9f16bb5e22e21f1b790/package.tf#L2

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