Re: [PATCH] for-each-repo: do nothing on empty config

[Eric Sunshine <sunshine@sunshineco.com>]

On Tue, Jan 5, 2021 at 9:44 AM Derrick Stolee via GitGitGadget
<gitgitgadget@gmail.com> wrote:
> 'git for-each-repo --config=X' should return success without calling any
> subcommands when the config key 'X' has no value. The current
> implementation instead segfaults.
> [...]
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> diff --git a/builtin/for-each-repo.c b/builtin/for-each-repo.c
> @@ -51,6 +51,9 @@ int cmd_for_each_repo(int argc, const char **argv, const char *prefix)
>         values = repo_config_get_value_multi(the_repository,
>                                              config_key);
> +       if (!values)
> +               return result;

Probably not worth a re-roll, but the above has higher cognitive load than:

    if (!value)
        return 0;

which indicates clearly that the command succeeded, whereas `return
result` makes the reader scan all the code above the conditional to
figure out what values `result` could possibly hold.

> diff --git a/t/t0068-for-each-repo.sh b/t/t0068-for-each-repo.sh
> @@ -27,4 +27,8 @@ test_expect_success 'run based on configured value' '
> +test_expect_success 'do nothing on empty config' '
> +       git for-each-repo --config=bogus.config -- these args would fail
> +'

The `these args would fail` arguments add mystery to the test,
prompting the reader to wonder what exactly is going on: "Fail how?",
"Is it supposed to fail?". It might be less confusing to use something
more direct like `nonexistent` or `does not exist`.