Re: [PATCH 2/2] ci(check-whitespace): restrict to the intended commits

[Junio C Hamano <gitster@pobox.com>]

"Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
writes:

> Unfortunately, this means that we no longer can rely on a shallow clone:
> There is no way of knowing just how many commits the upstream branch
> advanced after the commit from which the PR branch branched off. So
> let's just go with a full clone instead, and be safe rather than sorry
> (if we have "too shallow" a situation, a commit range `@{u}..` may very
> well include a shallow commit itself, and the output of `git show
> --check <shallow>` is _not_ pretty).

Makes sense.

As long as you have pull-request base, I suspect that you could
shallow clone the base and incrementally fetch the rest to update,
perhaps?  But I do not know if it is worth doing so for a small
project like ours.

Thanks.

> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>  .github/workflows/check-whitespace.yml | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/.github/workflows/check-whitespace.yml b/.github/workflows/check-whitespace.yml
> index c53614d6033..8c4358d805c 100644
> --- a/.github/workflows/check-whitespace.yml
> +++ b/.github/workflows/check-whitespace.yml
> @@ -12,15 +12,9 @@ jobs:
>    check-whitespace:
>      runs-on: ubuntu-latest
>      steps:
> -    - name: Set commit count
> -      shell: bash
> -      run: echo "COMMIT_DEPTH=$((1+$COMMITS))" >>$GITHUB_ENV
> -      env:
> -        COMMITS: ${{ github.event.pull_request.commits }}
> -
>      - uses: actions/checkout@v2
>        with:
> -        fetch-depth: ${{ env.COMMIT_DEPTH }}
> +        fetch-depth: 0
>  
>      - name: git log --check
>        id: check_out
> @@ -47,7 +41,7 @@ jobs:
>              echo "${dash} ${etc}"
>              ;;
>            esac
> -        done <<< $(git log --check --pretty=format:"---% h% s" -${{github.event.pull_request.commits}})
> +        done <<< $(git log --check --pretty=format:"---% h% s" ${{github.event.pull_request.base.sha}}..)
>  
>          if test -n "${log}"
>          then