Subject: Re: [PATCH v2] help.c: fix autocorrect in work tree for bare repository

From: Junio C Hamano <[email-masked]>
Date: Tue, 13 Dec 2022 10:37:52 +0900

"Simon Gerber via GitGitGadget" <[email-masked]> writes:

> Calling `git_default_config()` in this callback to `read_early_config()`
> seems like a bad idea since those calls will initialize a bunch of state
> in `environment.c` (among other things `is_bare_repository_cfg`) before
> we've properly detected that we're running in a work tree.
>
> All other callbacks provided to `read_early_config()` appear to only
> extract their configurations while simply returning `0` for all other
> config keys.

Very good observation and justification for this change.

>  help.c                      | 2 +-
>  t/t9003-help-autocorrect.sh | 6 ++++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/help.c b/help.c
> index d04542d8261..ae534ff0bae 100644
> --- a/help.c
> +++ b/help.c
> @@ -563,7 +563,7 @@ static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
>  	if (skip_prefix(var, "alias.", &p))
>  		add_cmdname(&aliases, p, strlen(p));
>  
> -	return git_default_config(var, value, cb);
> +	return 0;
>  }

And this is exactly what the proposed log message promises to do.

>  static int levenshtein_compare(const void *p1, const void *p2)
> diff --git a/t/t9003-help-autocorrect.sh b/t/t9003-help-autocorrect.sh
> index f00deaf3815..f5b6b4f746b 100755
> --- a/t/t9003-help-autocorrect.sh
> +++ b/t/t9003-help-autocorrect.sh
> @@ -60,4 +60,10 @@ test_expect_success 'autocorrect can be declined altogether' '
>  	test_line_count = 1 actual
>  '
>  
> +test_expect_success 'autocorrect works in work tree created from bare repo' '
> +	git clone --bare . bare.git &&
> +	git -C bare.git worktree add ../worktree &&
> +	git -C worktree -c help.autocorrect=immediate stauts

The reason why this third line is a sufficient test is...?

If "status" is invoked successfully, it would not exit with non-zero
status as long as it correctly notices that it was invoked in a
worktree (as opposed to the current code without your fix, which
would say "nah, where you are running there is no worktree", that is
incorrect), but one scenario I am a bit worried about is what if the
tester has an entry on $PATH that has "git-static" or whatever that
is similar enough to "status", to cause autocorrect work differently
from the case where "git status" would be the only plausible case.

But then we can tell such a tester "don't do that, then" ;-)

Let's queue the patch as-is and see what others think.

Thanks.

> +'
> +
>  test_done