Re: [PATCH v6 4/6] verify-tag: add sha1 argument to verify_tag()

[Eric Sunshine <sunshine@sunshineco.com>]

On Sun, Apr 17, 2016 at 6:26 PM,  <santiago@nyu.edu> wrote:
> verify-tag: add sha1 argument to verify_tag()

Mentioned previously[1]: This subject is talking about low level
details of the change rather than giving a high-level overview. A
suggested replacement[1] would be:

    verify-tag: prepare verify_tag() for libification

> The current interface of verify_tag() resolves reference names to SHA1,
> which might be redundant as future callers may resolve the refname to
> SHA1 beforehand.

There is no mention here that the plan is to libify verify_tag() and
"might be redundant" is a somewhat weak way to argue in favor of this
change. The commit messages proposed in the previous review[1] was
more explicit:

    verify_tag() accepts a tag name which it resolves to a SHA1
    before verification, however, the plan is to make this
    functionality public and it is possible that future callers will
    already have a SHA1 in hand. Since it would be wasteful for them
    to supply a tag name only to have it resolved again, change
    verify_tag() to accept a tag SHA1 rather than a name.

> Add a SHA1 parameter to use instead of the name parameter. We also
> replace the name argument to report_name and use it for error reporting
> only.

The patch itself looks okay, though see a few nits below (which may
not be worth a re-roll).

[1]: http://article.gmane.org/gmane.comp.version-control.git/290829

> Signed-off-by: Santiago Torres <santiago@nyu.edu>
> ---
> diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
> @@ -80,6 +79,8 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
>  {
>         int i = 1, verbose = 0, had_error = 0;
>         unsigned flags = 0;
> +       unsigned char sha1[20];
> +       const char *name;

Nit: These could have been declared in the scope of the while-loop
(below) since you've added braces to it.

> @@ -96,8 +97,14 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
> -       while (i < argc)
> -               if (verify_tag(argv[i++], flags))
> +       while (i < argc) {
> +               name = argv[i++];
> +               if (get_sha1(name, sha1)) {
> +                       error("tag '%s' not found.", name);
>                         had_error = 1;

These lines could be combined:

    had_error = !!error("tag '%s' not found.", name);

which would allow you to drop the braces.

> +               }
> +               else if (verify_tag(sha1, name, flags))
> +                       had_error = 1;

Style: cuddle '}' and else:

    } else

> +       }
>         return had_error;
>  }