Github Actions get output fom one job to matrix job - github

Question

all.
I have this pipeline. Where I just basically want to get changed filed dirs and run helm push command on that dirs.
name: Helm Package and Push
on:
push:
branches:
- chartChange
paths:
- 'charts/**'
jobs:
detect_changes:
runs-on: ubuntu-latest
outputs:
list: ${{ steps.changed-files-specific.outputs.all_changed_files }}
steps:
- name: Checkout
uses: actions/checkout#v2
- name: Get changed files in the docs folder
id: changed-files-specific
uses: tj-actions/changed-files#v35
with:
json: true
files: charts/** # Alternatively using: `docs/**` or `docs`
- name: Run bash script
run: |
for i in ${{ steps.changed-files-specific.outputs.all_changed_files }}; do echo ${i%/*}; done
Test_from_first_job:
needs: detect_changes
runs-on: ubuntu-latest
strategy:
matrix:
folders: ${{fromJson(needs.detect_changes.outputs.list)}}
steps:
- name: Checkout
uses: actions/checkout#v2
- name: Run test step
run: |
echo ${{matrix.folders}}
But however my jobs failing with this error:
Error when evaluating 'strategy' for job 'Test_from_first_job'. .github/workflows/cm-
push.yml (Line: 37, Col: 22): Error parsing fromJson,.github/workflows/cm-push.yml
(Line: 37, Col: 22): Unexpected character encountered while parsing value: \. Path '',
line 1, position 1.,.github/workflows/cm-push.yml (Line: 37, Col: 22): Unexpected type
of value '', expected type: Sequence.
Any ideas how can i make it work ?
REgards

Answer 1

The matrix must be able to expand at the time the template is parsed and it can't rely on any runtime-defined values.
You'll need to rely on a script to trigger another workflow and pass the value in as a parameter. The parameter value IS available at parse time, so that can be used to spin up the matrix.
Or you must loop through the values using a runtime solution, such as a script block and a for-loop.