-out not working when redirecting terragrunt STDERR

[Erbrowl]

Describe the bug

When redirecting STDERR, -out CLI option doesn't generate and output file with plan info.

Steps To Reproduce

# Creates plan.tfplan with plan info
terragrunt plan -out=plan.tfplan

# Doesn't create plan.tfplan, still redirects STDERR to errors.txt
terragrunt plan -out=plan.tfplan 2> errors.txt

Expected behavior

Creation of -out specified output plan file and redirection of STDERR to file working at the same time.

Nice to haves

• Terminal output :

Saved the plan to: plan.tfplan

To perform exactly these actions, run the following command to apply:
    terraform apply "plan.tfplan"

Versions

• Terragrunt version: 0.71.1
• OpenTofu/Terraform version: 1.10.3
• Environment details: Debian docker container & WSL distro

Additional context

Same with or without --terragrunt-forward-tf-stdout flag

[wakeful]

can you try this? should work in v0.71.0+

[Erbrowl]

can you try this? should work in v0.71.0+

The redirection works properly, with and without --terragrunt-forward-tf-stdout flag.

The issue is more about the -out= not generating an output file in this specific case.

[yhakbar]

I tried to reproduce locally without success, @Erbrowl .

Do you mind sharing a fixture that can reproduce the issue you're experiencing?

$ terragrunt --version
terragrunt version v0.71.5

$ fd -tf -x bash -c 'echo "# {}" && cat {} && echo'
# ./mise.toml
[tools]
terragrunt = "0.71.5"

# ./main.tf
resource "null_resource" "empty" {
  triggers = {
    always_run = timestamp()
  }

  provisioner "local-exec" {
    command = "echo 'Hello, World!'"
  }
}

# ./terragrunt.hcl

$ terragrunt plan -out plan.tfplan 2> errors.txt
10:56:01.548 STDOUT tofu: OpenTofu used the selected providers to generate the following execution
10:56:01.548 STDOUT tofu: plan. Resource actions are indicated with the following symbols:
10:56:01.548 STDOUT tofu:   + create
10:56:01.548 STDOUT tofu: OpenTofu will perform the following actions:
10:56:01.548 STDOUT tofu:   # null_resource.empty will be created
10:56:01.548 STDOUT tofu:   + resource "null_resource" "empty" {
10:56:01.548 STDOUT tofu:       + id       = (known after apply)
10:56:01.548 STDOUT tofu:       + triggers = {
10:56:01.548 STDOUT tofu:           + "always_run" = (known after apply)
10:56:01.548 STDOUT tofu:         }
10:56:01.548 STDOUT tofu:     }
10:56:01.548 STDOUT tofu: Plan: 1 to add, 0 to change, 0 to destroy.
10:56:01.548 STDOUT tofu:
10:56:01.548 STDOUT tofu: ─────────────────────────────────────────────────────────────────────────────
10:56:01.548 STDOUT tofu: Saved the plan to: plan.tfplan
10:56:01.548 STDOUT tofu: To perform exactly these actions, run the following command to apply:
10:56:01.548 STDOUT tofu:     tofu apply "plan.tfplan"

$ eza -la plan.tfplan
.rw-r--r--@ 2.0k yousif 10 Jan 10:56 plan.tfplan

$ eza -la errors.txt
.rw-r--r--@ 2.4k yousif 10 Jan 10:56 errors.txt

$ terragrunt show plan.tfplan
10:56:25.433 STDOUT tofu: OpenTofu used the selected providers to generate the following execution
10:56:25.433 STDOUT tofu: plan. Resource actions are indicated with the following symbols:
10:56:25.433 STDOUT tofu:   + create
10:56:25.433 STDOUT tofu: OpenTofu will perform the following actions:
10:56:25.433 STDOUT tofu:   # null_resource.empty will be created
10:56:25.433 STDOUT tofu:   + resource "null_resource" "empty" {
10:56:25.433 STDOUT tofu:       + id       = (known after apply)
10:56:25.433 STDOUT tofu:       + triggers = {
10:56:25.433 STDOUT tofu:           + "always_run" = (known after apply)
10:56:25.433 STDOUT tofu:         }
10:56:25.433 STDOUT tofu:     }
10:56:25.433 STDOUT tofu: Plan: 1 to add, 0 to change, 0 to destroy.
10:56:25.433 STDOUT tofu: