Error parsing terraform version when tofu is installed as tofu-bin

[wyardley]

Describe the bug There may not be a good fix for this, but what I noticed is that if I set TERRAGRUNT_TFPATH to tofu, Terragrunt will correctly find / use opentofu instead of Terraform, but then barfs when it finds a wrapper unless TERRAGRUNT_TFPATH is also set to tofu-bin. This is an easy fix once you figure out what the issue is (either by updating TERRAGRUNT_TFPATH, or by configuring the setupu-opentofu action to not use the wrapper), but a bit tricky to debug in a CI environment. Maybe because of a symlink?

To Reproduce

    - uses: actions/checkout@v4
    - uses: opentofu/setup-opentofu@v1
    - uses: autero1/action-terragrunt@v1.3.2
      with:
        terragrunt_version: 0.53.8

$ export TERRAGRUNT_DISABLE_INIT=true 
$ export TERRAGRUNT_NON_INTERACTIVE=true
$ export TERRAGRUNT_TFPATH=tofu
$ terragrunt --terragrunt-working-dir "$DIR" run-all init

Expected behavior Terragrunt to initialize

Nice to have

• [ ] Terminal output

  
  for DIR in $(/bin/ls -d environments/*); do
  terragrunt --terragrunt-working-dir "$DIR" run-all init
  terragrunt --terragrunt-working-dir "$DIR" run-all validate
  done
  shell: /usr/bin/bash -e {0}
  env:
  CHECKPOINT_DISABLE: true
  TERRAGRUNT_DISABLE_INIT: true
  TERRAGRUNT_NON_INTERACTIVE: true
  TERRAGRUNT_TFPATH: tofu
  TF_CLI_ARGS_init: -compact-warnings
  TF_CLI_ARGS_validate: -compact-warnings
  TF_IN_AUTOMATION: true
  TOFU_CLI_PATH: /home/runner/work/_temp/37640e4d-40fa-411b-af9d-b13569f189a9
  time=2023-11-30T23:44:13Z level=info msg=The stack at environments/xxxx will be processed in the following order for command init:
  Group 1

• Module /home/runner/work/tofu/tofu/environments/xxx/network

-11-30T23:44:13Z level=error msg=Module /home/runner/work/tofu/tofu/environments/xxx/network has finished with an error: Unable to parse Terraform version output: [command]/home/runner/work/_temp/37640e4d-40fa-411b-af9d-b13569f189a9/tofu-bin --version OpenTofu v1.6.0-beta1 on linux_amd64

• provider registry.opentofu.org/hashicorp/google v5.7.0
• provider registry.opentofu.org/hashicorp/google-beta v5.7.0 prefix=[/home/runner/work/tofu/tofu/environments/xxx/network] time=2023-11-30T23:44:13Z level=error msg=1 error occurred: to parse Terraform version output: [command]/home/runner/work/_temp/37640e4d-40fa-411b-af9d-b13569f189a9/tofu-bin --version OpenTofu v1.6.0-beta1 on linux_amd64
• provider registry.opentofu.org/hashicorp/google v5.7.0
• provider registry.opentofu.org/hashicorp/google-beta v5.7.0 time=2023-11-30T23:44:13Z level=error msg=Unable to determine underlying exit code, so Terragrunt will exit with error code 1 Error: Process completed with exit code 1.

• [ ] Screenshots

Versions

• Terragrunt version: 0.53.8
• Terraform version: 1.6.0 (OpenTofu)
• Environment details (Ubuntu 20.04, Windows 10, etc.): Ubuntu (GHA)

Additional context

2818 / #2817 are not really related, other than it being why I dug into the regex, but I opened it anyway

[wyardley]

I went ahead and created this, even though I figured out the answer, in case finding this in search helps someone else. Closing