Trigger a github workflow if it matches a particular comment in the Pull Request

[uditgaurav]

I want to trigger a workflow if it matches a particular comment (string) in a pull request.
So let suppose if I comment on a pull request /support then the GitHub action should get a trigger.
Comment Like:

Screenshot from 2020-06-02 20-29-43826×118 12 KB

If the action receives /support comment if should trigger the workflow which is running some command say echo “Hello World”
and if I comment /test then it should run some different commands like … echo “test”

[weide-zhou]

Hi @uditgaurav,

There is not a specific event which only monitor the pull request event, you can use ‘issue_comment’ instead, it will monitor comment for both issue and pull request. In the job level, use if expression to filter the comment, exclude the comments from issue.
Code sample as below:

name: pull request comment
on:
  issue_comment:                                     
    types: [created, edited, deleted]
jobs:

job01:

if: contains(github.event.comment.html_url, '/pull/')    # check if the comments come from pull request, exclude those from issue.

runs-on: [ubuntu-latest]

steps:

- name: say hello

if: contains(github.event.comment.body, '/support')   # check the comment if it contains the keywords

run: |

echo say hello

- name: test

if: contains(github.event.comment.body, '/test')  # check the comment if it contains the keywords

run: |

echo test

I tried on my repo, and it works fine.

pullrequestcomment855×710 33 KB

Thanks

Note: please use issue_comment in default branch,eg: master branch.

[JackelynOliveira]

As per the documentation, there's another way to check if the comment was done on a PR or on an issue:

name: pull request comment
on:
  issue_comment:                                     
    types: [created, edited, deleted]
jobs:
job01:
if: ${{ github.event.issue.pull_request }}    # <--- The other way to compare if it's on a PR or on an issue
runs-on: [ubuntu-latest]
steps:
...

[swathida-byte]

name: pull request comment
on:
  issue_comment:                                     
    types: [created, edited, deleted]
jobs:
 job01:
   if: contains(github.event.comment.html_url, '/pull/')    # check if the comments come from pull request, exclude those from issue.
   runs-on: [re-centos7]
   steps:
    - name: say hello
      if: contains(github.event.comment.body, '/support')   # check the comment if it contains the keywords
      run: |
       echo say hello
    - name: test
      if: contains(github.event.comment.body, '/test')  # check the comment if it contains the keywords
      run: |
       echo test

I'm using this yaml file to trigger actions when commented on pull-request, jobs are not getting triggered 
  Do I need to enable anything for this to get triggered on a comment?

[SanMantri]

Merge your branch into the default branch, and then give it a try.

https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows
Note: This event will only trigger a workflow run if the workflow file is on the default branch.

[tarekbeb]

@SanMantri THANK YOU!! you saved my day!!

[swathida-byte]

I upgraded Github enterprise server version to 3.6.3 it works now

[BadhreeBabu]

This trick triggers the job, but does not show in PR checks

[undesicimo]

its like a dispatch event and not really tied to a pr. You can check the run details on the Actions tab

[igor-davidyuk]

It also does not pass the ref for the branch into the checkout action