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Suppress hint: You are in 'detached HEAD' state. #494

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@jsoref

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@jsoref

Downstream consumers of actions shouldn't see noise that git is checking out a detached head. When actions/checkout is used, it will be given something specific to check out, and if that results in a detached head, that's clearly intentional...

name: Spell checking
on:
  pull_request_target:

jobs:
  check-spelling:
    name: Spell checking
    runs-on: ubuntu-latest
    steps:
    - name: checkout-merge
      if: "contains(github.event_name, 'pull_request')"
      uses: actions/checkout@v2.0.0
      with:
        ref: refs/pull/${{github.event.pull_request.number}}/merge
Run actions/checkout@v2.0.0
  with:
    ref: refs/pull/1/merge
    repository: check-spelling/sticky-pull-request-comment
    token: ***
    persist-credentials: true
    clean: true
    fetch-depth: 1
    lfs: false
Syncing repository: check-spelling/sticky-pull-request-comment
Working directory is '/home/runner/work/sticky-pull-request-comment/sticky-pull-request-comment'
...
From https://github.com/check-spelling/sticky-pull-request-comment
 * [new ref]         refs/pull/1/merge -> pull/1/merge
/usr/bin/git checkout --progress --force refs/remotes/pull/1/merge
Note: switching to 'refs/remotes/pull/1/merge'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 4ea2184 Merge b9cf99a584fe42271c3aaee8ad2337ed41fe71b5 into 49d94c2e2fd173b2af1fedaabb95dbd37c0e80e4
/usr/bin/git log -1
commit 4ea21846857440dff5c72b5cd423d1f8d56400c5
Author: Josh Soref <jsoref@users.noreply.github.com>
Date:   Wed May 5 08:47:45 2021 -0400

    Merge b9cf99a584fe42271c3aaee8ad2337ed41fe71b5 into 49d94c2e2fd173b2af1fedaabb95dbd37c0e80e4

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