GitHub Actions: Can't set env variable - github

Question

I am trying to set a simple environment variable based on the branch name, but I cannot get it to work. Based on the logs, the env var seems to be set correctly, but it is still empty afterwards:
TF_VAR_project_name=staging >> /home/runner/work/_temp/_runner_file_commands/set_env_51dc1c8d-60b9-47bd-b91e-f315cd9349a7
--
name: "Terraform"
on:
push:
branches:
- main
- staging
pull_request:
jobs:
terraform:
name: "Terraform"
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout#v2
- name: Get branch names
id: branch-name
uses: tj-actions/branch-names#v4
- name: For PR, get base ref branch name
if: github.event_name == 'pull_request'
run: |
echo "TF_VAR_project_name=${{ steps.branch-name.outputs.base_ref_branch }} >> $GITHUB_ENV"
- name: For push, get current branch name
if: github.event_name == 'push'
run: |
echo "TF_VAR_project_name=${{ steps.branch-name.outputs.current_branch }} >> $GITHUB_ENV"
- name: Test1
run: |
echo "$TF_VAR_project_name"
- name: Set is prod based on the branch
run: |
echo "TF_VAR_is_prod=$(( $TF_VAR_project_name == prod ? true : false ))" >> $GITHUB_ENV
Complete Log:
Thanks!

Answer 1

There are two syntax problems with your workflow:
FIRST:
The syntax used to set variables has " incorrectly used:
run: |
echo "TF_VAR_project_name=${{ steps.branch-name.outputs.base_ref_branch }} >> $GITHUB_ENV"
Should be:
run: |
echo "TF_VAR_project_name=${{ steps.branch-name.outputs.base_ref_branch }}" >> $GITHUB_ENV
Before the >> $GITHUB_ENV (documentation reference)
SECOND:
The syntax used at the last step uses $(( ... )) instead of ${{ .. }}:
- name: Set is prod based on the branch
run: |
echo "TF_VAR_is_prod=$(( $TF_VAR_project_name == prod ? true : false ))" >> $GITHUB_ENV
Should be:
- name: Set is prod based on the branch
run: |
echo "TF_VAR_is_prod=${{ $TF_VAR_project_name == prod ? true : false }}" >> $GITHUB_ENV
As you used on other steps.