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From: Eric Sunshine <sunshine@sunshineco.com>
To: Max Kirillov <max@max630.net>
Cc: Michael Haggerty <mhagger@alum.mit.edu>, Git List <git@vger.kernel.org>
Subject: Re: [RFC PATCH] pack-refs: fail on falsely sorted packed-refs
Date: Wed, 30 Jan 2019 18:31:34 -0500
Message-ID: <CAPig+cTn2gURyQgWHZQMNf2cZ+zwFhbH1Q4iPmbwuvYjMrPZPg@mail.gmail.com> (raw)
In-Reply-To: <20190130231359.23978-1-max@max630.net>

On Wed, Jan 30, 2019 at 6:21 PM Max Kirillov <max@max630.net> wrote:
> If packed-refs is marked as sorted but not really sorted it causes
> very hard to comprehend misbehavior of reference resolving - a reference
> is reported as not found.
>
> As the scope of the issue is not clear, make it visible by failing
> pack-refs command - the one which would not suffer performance penalty
> to verify the sortedness - when it encounters not really sorted existing
> data.
>
> Signed-off-by: Max Kirillov <max@max630.net>
> ---
> diff --git a/refs/packed-backend.c b/refs/packed-backend.c
> @@ -1088,6 +1088,7 @@ static int write_with_updates(struct packed_ref_store *refs,
> +       struct strbuf prev_ref = STRBUF_INIT;
> @@ -1137,6 +1138,20 @@ static int write_with_updates(struct packed_ref_store *refs,
> +               if (iter)
> +               {
> +                       if (prev_ref.len &&  strcmp(prev_ref.buf, iter->refname) > 0)
> +                       {
> +                               strbuf_addf(err, "broken sorting in packed-refs: '%s' > '%s'",
> +                                           prev_ref.buf,
> +                                           iter->refname);

strbuf_release(&prev_ref) either here or after the "error" label.

> +                               goto error;
> +                       }
> +
> +                       strbuf_init(&prev_ref, 0);
> +                       strbuf_addstr(&prev_ref, iter->refname);
> +               }
> diff --git a/t/t3212-pack-refs-broken-sorting.sh b/t/t3212-pack-refs-broken-sorting.sh
> @@ -0,0 +1,26 @@
> +test_expect_success 'setup' '
> +       git commit --allow-empty -m commit &&
> +       for num in $(test_seq 10)
> +       do
> +               git branch b$(printf "%02d" $num) || break

This should probably be "|| return 1" rather than "|| break" in order
to fail the test immediately.

> +       done &&
> +       git pack-refs --all &&
> +       head_object=$(git rev-parse HEAD) &&
> +       printf "$head_object refs/heads/b00\\n" >>.git/packed-refs &&
> +       git branch b11
> +'
> +
> +test_expect_success 'off-order branch not found' '
> +       ! git show-ref --verify --quiet refs/heads/b00
> +'

Use test_must_fail() rather than '!' when expecting a Git command to fail.

> +test_expect_success 'subsequent pack-refs fails' '
> +       ! git pack-refs --all
> +'

Ditto.

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30 23:13 Max Kirillov
2019-01-30 23:31 ` Eric Sunshine [this message]
2019-01-31  8:21   ` Max Kirillov
2019-02-08 21:22   ` [PATCH v2] " Max Kirillov
2019-02-08 21:40     ` Eric Sunshine
2019-02-13  4:24       ` Max Kirillov
     [not found]     ` <CAMy9T_EX_L80-V4zD626nFCxw6qa90+pZwcbd6wHw9ZHcj2rNA@mail.gmail.com>
2019-02-13  4:23       ` Max Kirillov
2019-02-13 10:08 ` [RFC PATCH] " Ævar Arnfjörð Bjarmason
2019-02-13 10:56   ` SZEDER Gábor
2019-02-23  7:10     ` Max Kirillov
2019-02-14  6:06   ` Jeff King
2019-02-23  7:09   ` Max Kirillov

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