Re: [PATCH v4 1/3] stash: add tests to ensure reflog --rewrite --updatref behavior

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

On Thu, Mar 03 2022, Phillip Wood wrote:

> On 02/03/2022 23:32, Junio C Hamano wrote:
>> "John Cai via GitGitGadget" <gitgitgadget@gmail.com> writes:
>> [...]
>>> +test_expect_success REFFILES 'drop stash reflog updates refs/stash with rewrite' '
>>> +	git init repo &&
>>> +	(
>>> +		cd repo &&
>>> +		setup_stash
>>> +	) &&
>> Hmph, so this is done inside the subdirectory.  The implementation
>> of the helper in this iteration does look cleaner than in the
>> previous iteration.
>> But these many references to "repo/" and "-C repo" we see below
>> makes me wonder why we do not put the whole thing inside the
>> subshell we started earlier.
>> i.e.
>> 	git init repo &&
>> 	(
>> 		cd repo &&
>> 		setup_stash_test &&
>> 		echo 9 >file &&
>> 		old=$(git rev-parse stash@{0}) &&
>> 		git stash &&
>> 		new=$(git rev-parse stash@{0}) &&
>> 		...
>> 		test_cmp expect actual
>> 	)
>>
>
> I wonder if we could avoid the subshell entirely and avoid relying on
> REFFILES (assuming we're not trying to test the implementation details 
> of that refs backend) by doing something like
>
> test_expect_success 'drop stash reflog updates refs/stash with rewrite' '
> 	old=$(git rev-parse stash@{0}) &&
> 	setup_stash_test &&
> 	git rev-list -g stash >tmp &&
> 	sed /$old/d tmp >expect &&
> 	git rev-list -g stash >actual &&
> 	test_cmp expect actual
> '

Unless I'm missing something that "rev-list -g" will emit only the RHS
of the stash logs, i.e. no "0000..." etc.

And if we only look at that the difference with specifying the flag
isn't visible, no?

>>> +	echo 9 >repo/file &&
>>> +
>>> +	old_oid="$(git -C repo rev-parse stash@{0})" &&
>>> +	git -C repo stash &&
>>> +	new_oid="$(git -C repo rev-parse stash@{0})" &&
>>> +
>>> +	cat >expect <<-EOF &&
>>> +	$(test_oid zero) $old_oid
>>> +	$old_oid $new_oid
>>> +	EOF
>>> +	cut -d" " -f1-2 repo/.git/logs/refs/stash >actual &&
>>> +	test_cmp expect actual &&
>>> +
>>> +	git -C repo stash drop stash@{1} &&
>>> +	cut -d" " -f1-2 repo/.git/logs/refs/stash >actual &&
>>> +	cat >expect <<-EOF &&
>>> +	$(test_oid zero) $new_oid
>>> +	EOF
>>> +	test_cmp expect actual
>>> +'
>>> +
>>>   test_expect_success 'stash pop' '
>>>   	git reset --hard &&
>>>   	git stash pop &&