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From: Eric Sunshine <sunshine@sunshineco.com>
To: Olga Telezhnaya <olyatelezhnaya@gmail.com>
Cc: Git List <git@vger.kernel.org>
Subject: Re: [PATCH v4 5/5] ref-filter: get_ref_atom_value() error handling
Date: Tue, 20 Mar 2018 14:19:11 -0400
Message-ID: <CAPig+cSxGgG=1k95j+n4DZHBdtN++7F6_U5fu0gOcjwwPQ5GZw@mail.gmail.com> (raw)
In-Reply-To: <010201624428199f-b4b3d8ce-222f-4966-9171-7fcf932ca220-000000@eu-west-1.amazonses.com>

On Tue, Mar 20, 2018 at 12:05 PM, Olga Telezhnaya
<olyatelezhnaya@gmail.com> wrote:
> ref-filter: get_ref_atom_value() error handling

This doesn't tell us much about what this patch is doing. Perhaps a
better subject would be:

    ref-filter: libify get_ref_atom_value()

> Finish removing die() calls from ref-filter formatting logic,
> so that it could be used by other commands.
>
> Change the signature of get_ref_atom_value() and underlying functions
> by adding return value and strbuf parameter for error message.
> Return value equals 0 upon success and -1 upon failure (there
> could be more error codes further if necessary).
> Upon failure, error message is appended to the strbuf.
>
> Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com>
> ---
> diff --git a/ref-filter.c b/ref-filter.c
> @@ -1445,28 +1445,36 @@ static const char *get_refname(struct used_atom *atom, struct ref_array_item *re
> +static int get_object(struct ref_array_item *ref, const struct object_id *oid,
> +                      int deref, struct object **obj, struct strbuf *err)
>  {
>         void *buf = get_obj(oid, obj, &size, &eaten);
> -       if (!buf)
> -               die(_("missing object %s for %s"),
> -                   oid_to_hex(oid), ref->refname);
> -       if (!*obj)
> -               die(_("parse_object_buffer failed on %s for %s"),
> -                   oid_to_hex(oid), ref->refname);
> -
> +       if (!buf) {
> +               strbuf_addf(err, _("missing object %s for %s"), oid_to_hex(oid),
> +                           ref->refname);
> +               if (!eaten)
> +                       free(buf);

Since we are inside the 'if (!buf)' conditional, we _know_ that 'buf'
is NULL, therefore this free(buff) is unnecessary.

> +               return -1;
> +       }
> +       if (!*obj) {
> +               strbuf_addf(err, _("parse_object_buffer failed on %s for %s"),
> +                           oid_to_hex(oid), ref->refname);
> +               if (!eaten)
> +                       free(buf);
> +               return -1;
> +       }
>         grab_values(ref->value, deref, *obj, buf, size);
>         if (!eaten)
>                 free(buf);
> +       return 0;
>  }

Overall, with the need for resource cleanup, this function becomes
unusually noisy after this change. It could be tamed by doing
something like this:

    int ret = 0;
    void *buf = get_obj(oid, obj, &size, &eaten);
    if (!buf)
        ret = strbuf_error(_("missing object %s for %s"),
            oid_to_hex(oid), ref->refname);
    else if (!*obj)
        ret = strbuf_error(_("parse_object_buffer failed on %s for %s"),
            oid_to_hex(oid), ref->refname);
    else
        grab_values(ref->value, deref, *obj, buf, size);
   if (!eaten)
        free(buf);
    return ret;

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-13 10:16 [RFC 1/4] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-13 10:16 ` [RFC 3/4] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-13 19:18   ` Martin Ågren
2018-03-14 13:36     ` Оля Тележная
2018-03-13 10:16 ` [RFC 4/4] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-13 10:16 ` [RFC 2/4] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-13 19:13   ` Martin Ågren
2018-03-13 19:12 ` [RFC 1/4] ref-filter: start adding strbufs with errors Martin Ågren
2018-03-14 13:30   ` Оля Тележная
2018-03-14 19:04 ` [PATCH v2 1/5] " Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-15 20:47     ` Martin Ågren
2018-03-15 21:01       ` Eric Sunshine
2018-03-16  7:20         ` Оля Тележная
2018-03-15 21:05       ` Junio C Hamano
2018-03-16  7:17       ` Оля Тележная
2018-03-14 19:04   ` [PATCH v2 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-14 19:04   ` [PATCH v2 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-15 22:48     ` Junio C Hamano
2018-03-16  7:22       ` Оля Тележная
2018-03-14 19:04   ` [PATCH v2 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-19 13:01   ` [PATCH v3 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-19 19:41       ` Junio C Hamano
2018-03-19 13:01     ` [PATCH v3 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-19 19:24       ` Junio C Hamano
2018-03-19 13:01     ` [PATCH v3 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-19 13:01     ` [PATCH v3 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-20 16:05     ` [PATCH v4 1/5] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 5/5] ref-filter: get_ref_atom_value() error handling Olga Telezhnaya
2018-03-20 18:19         ` Eric Sunshine [this message]
2018-03-20 22:30           ` Junio C Hamano
2018-03-20 22:50             ` Eric Sunshine
2018-03-21 19:30               ` Junio C Hamano
2018-03-21 19:58                 ` Eric Sunshine
2018-03-20 16:05       ` [PATCH v4 2/5] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-20 18:18         ` Eric Sunshine
2018-03-20 16:05       ` [PATCH v4 4/5] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-20 16:05       ` [PATCH v4 3/5] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-21 18:28       ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 4/6] ref-filter: change parsing function error handling Olga Telezhnaya
2018-03-21 20:36           ` Junio C Hamano
2018-03-23  6:56             ` Оля Тележная
2018-03-21 18:28         ` [PATCH v5 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-21 18:28         ` [PATCH v5 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-21 20:20         ` [PATCH v5 1/6] strbuf: add shortcut to work with error messages Junio C Hamano
2018-03-23  6:48           ` Оля Тележная
2018-03-29 12:49         ` [PATCH v6 1/6] ref-filter: add shortcut to work with strbufs Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 6/6] ref-filter: libify get_ref_atom_value() Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 3/6] ref-filter: add return value && strbuf to handlers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 5/6] ref-filter: add return value to parsers Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 2/6] ref-filter: start adding strbufs with errors Olga Telezhnaya
2018-03-29 12:49           ` [PATCH v6 4/6] ref-filter: change parsing function error handling Olga Telezhnaya

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