Unable to parse Commit Message in the Github Action - github-actions

Question

I've been working on this for months now, but
I still can't parse the 'Commit Message' properly with Python (see script below).
You see, with every commit in my repository, every commit message begins with what represents the release's version number.
As of this writing, for example, parsing the commit message would result the a tag:
v8.11.0
I get this error message instead:
I'm not certain if it's creating the variable, tag, or not.
Python is not working for me. Would anyone have another approach?
# This workflow tests and releases the latest build
name: CI
# Controls when the action will run.
on:
# Triggers the workflow on push or pull request events but only for the master branch
push:
branches: [ master ]
pull_request:
branches: [ master ]
# Allows you to run this workflow manually from the Actions tab
workflow_dispatch:
# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
# This workflow contains a single job called "build-and-test"
build-and-test:
# The type of runner that the job will run on
runs-on: ubuntu-latest
# Steps represent a sequence of tasks that will be executed as part of the job
steps:
# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
- uses: actions/checkout#v2
# Use the standard Java Action to setup Java
# we want the latest Java 12
- uses: actions/setup-java#v1
with:
java-version: '12.x'
# Use the community Action to install Flutter
# we want the stable channel
- uses: subosito/flutter-action#v1
with:
channel: 'stable'
# Get flutter packages
- run: flutter pub get
# Check for any formatting issues in the code.
- run: flutter format .
# Analyze our Dart code, but don't fail with there are issues.
- run: flutter analyze . --preamble --no-fatal-infos --no-fatal-warnings
# Run our tests
- run: flutter test --coverage
# Upload to codecov
- uses: codecov/codecov-action#v2
with:
token: ${{secrets.CODECOV_TOKEN}}
file: ./coverage/lcov.info
# Parse a tag from the commit message
- id: get-tag
shell: python3 {0}
run: |
import json
import os
with open(os.environ['GITHUB_EVENT_PATH']) as fh:
event = json.load(fh)
tag = event['head_commit']['message'].split()[0] <----- tag NOT CREATED?!
# Create a Release
- uses: softprops/action-gh-release#v1
env:
# This token is provided by Actions, you do not need to create your own token
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
with:
tag_name: v${{ steps.get-tag.outputs.tag }} <----- ERROR HERE!
release_name: ${{ steps.get-tag.outputs.tag }} <----- ERROR HERE!
body: |
See CHANGELOG.md
draft: false
prerelease: false
Using an alternative approach, I'm able to produce a tag using the current date.
This proves that it all works expect when trying to assign a 'tag' value using Python.
# Get current datetime in ISO format
- id: date
run: echo "::set-output name=date::$(date -u +'%Y-%m-%d')"
# Create a Release
- uses: softprops/action-gh-release#v1
env:
# This token is provided by Actions, you do not need to create your own token
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
with:
tag_name: ${{ steps.date.outputs.date }}v${{ github.run_number }}
name: ${{ steps.date.outputs.date }}v${{ github.run_number }}
body: |
See CHANGELOG.md
draft: false
prerelease: false
Any ideas?

Answer 1

steps.get-tag.outputs.tag is not correctly output in your workflow.
You should output it as described in the docs:
- id: get-tag
shell: python3 {0}
run: |
import json
import os
with open(os.environ['GITHUB_EVENT_PATH']) as fh:
event = json.load(fh)
tag = event['head_commit']['message'].split()[0]
print("::set-output name=tag::" + tag) # <--- This line