Re: [PATCH 2/2] t7900: clean up some broken refs

[Taylor Blau <me@ttaylorr.com>]

On Mon, Jan 18, 2021 at 03:23:36AM +0000, Derrick Stolee via GitGitGadget wrote:
> From: Derrick Stolee <dstolee@microsoft.com>
>
> The tests for the 'prefetch' task create remotes and fetch refs into
> 'refs/prefetch/<remote>/' and tags into 'refs/tags/'. These tests use
> the remotes to create objects not intended to be seen by the "local"
> repository.
>
> In that sense, the incrmental-repack tasks did not have these objects
> and refs in mind. That test replaces the object directory with a
> specific pack-file layout for testing the batch-size logic. However,
> this causes some operations to start showing warnings such as:
>
>  error: refs/prefetch/remote1/one does not point to a valid object!
>  error: refs/tags/one does not point to a valid object!
>
> This only shows up if you run the tests verbosely and watch the output.
> It caught my eye and I _thought_ that there was a bug where 'git gc' or
> 'git repack' wouldn't check 'refs/prefetch/' before pruning objects.
> That is incorrect. Those commands do handle 'refs/prefetch/' correctly.

Do you think it would be worth checking that 'does not point to a valid
object' doesn't appear in the output?

> All that is left is to clean up the tests in t7900-maintenance.sh to
> remove these tags and refs that are not being repacked for the
> incremental-repack tests.
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
>  t/t7900-maintenance.sh | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
> index f9031cbb44b..6be9d42767a 100755
> --- a/t/t7900-maintenance.sh
> +++ b/t/t7900-maintenance.sh
> @@ -256,6 +256,11 @@ test_expect_success 'incremental-repack task' '
>  	HEAD
>  	^HEAD~1
>  	EOF
> +
> +	# Replace the object directory with this pack layout.
> +	# However, it does not include all objects from the remotes.
> +	rm -rf .git/refs/prefetch &&
> +	rm -rf .git/refs/tags &&

Hmm. Makes sense, but this will certainly need to be updated to work
with reftables, and it would break if you ran 'git pack-refs'.

Perhaps instead:

  git for-each-ref --format='delete %(refname)' \
    refs/prefetch refs/tags >refs &&
  git update-ref --stdin <refs

?

Thanks,
Taylor