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From: Eric Sunshine <sunshine@sunshineco.com>
To: Jonathan Chang <ttjtftx@gmail.com>
Cc: Christian Couder <christian.couder@gmail.com>,
	Thomas Gummerer <t.gummerer@gmail.com>, git <git@vger.kernel.org>
Subject: Re: [GSoC][PATCH v2 3/5] t0003-attributes: avoid using pipes
Date: Sun, 10 Mar 2019 06:13:19 -0400
Message-ID: <CAPig+cQP74MC6fJC4fNCz9Rz3tDux1K4TGB7N+cOC8zScxOoAA@mail.gmail.com> (raw)
In-Reply-To: <20190310080931.64134-1-ttjtftx@gmail.com>

On Sun, Mar 10, 2019 at 4:09 AM Jonathan Chang <ttjtftx@gmail.com> wrote:
> The exit code of the upstream in a pipe is ignored thus we should avoid
> using it. By writing out the output of the git command to a file, we can
> test the exit codes of both the commands.
>
> Signed-off-by: Jonathan Chang <ttjtftx@gmail.com>
>
> diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
> @@ -203,15 +203,18 @@ test_expect_success 'attribute test: read paths from stdin' '
>  test_expect_success 'attribute test: --all option' '
>         grep -v unspecified <expect-all | sort >specified-all &&
>         sed -e "s/:.*//" <expect-all | uniq >stdin-all &&
> -       git check-attr --stdin --all <stdin-all | sort >actual &&
> +       git check-attr --stdin --all <stdin-all >actual &&
> +       sort -o actual actual &&
>         test_cmp specified-all actual
>  '

There is no existing use of "sort -o" anywhere in the Git test suite
(or, for that matter, anywhere else in Git), which should give one
pause before using it here. Although -o is allowed by POSIX, and POSIX
even says it's safe for the output file to have the same name as one
of the input files, there is no guarantee that "sort -o" will be
supported on all platforms, or that all platforms promise that the
output filename can match an input filename (in fact, neither the
MacOS nor FreeBSD man pages for 'sort' make this promise).
Consequently, it would be better to err on the side of safety and
avoid "sort -o", which is easily enough done by using another
temporary file:

    git check-attr --stdin --all <stdin-all >output &&
    sort output >actual &&

The same comment applies to the remaining changes.

  parent reply	other threads:[~2019-03-10 10:13 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-09 15:45 [GSoC][PATCH] tests: " Jonathan Chang
2019-03-09 16:45 ` Thomas Gummerer
2019-03-10  8:07   ` [GSoC][PATCH v2 1/5] t0000-basic: fix an indentation error Jonathan Chang
2019-03-10  8:08     ` [GSoC][PATCH v2 2/5] t0000-basic: avoid using pipes Jonathan Chang
2019-03-10  8:09       ` [GSoC][PATCH v2 3/5] t0003-attributes: " Jonathan Chang
2019-03-10  8:10         ` [GSoC][PATCH v2 4/5] t0022-crlf-rename: " Jonathan Chang
2019-03-10  8:11           ` [GSoC][PATCH v2 5/5] t0000-basic: use test_line_count instead of wc -l Jonathan Chang
2019-03-10  9:50             ` Eric Sunshine
2019-03-11 16:10               ` ttjtftx
2019-03-10 10:03           ` [GSoC][PATCH v2 4/5] t0022-crlf-rename: avoid using pipes Eric Sunshine
     [not found]             ` <CAOAu_YJKNjGd3mw7K17ySQJeF4XxC+V00FFEYA7o593riEGN1g@mail.gmail.com>
2019-03-11 15:54               ` Fwd: " ttjtftx
2019-03-10 10:13         ` Eric Sunshine [this message]
2019-03-15  1:56           ` [GSoC][PATCH v2 3/5] t0003-attributes: " jonathan chang
2019-03-10 17:59     ` [GSoC][PATCH v2 1/5] t0000-basic: fix an indentation error Thomas Gummerer
2019-03-15  1:55       ` jonathan chang
2019-03-15 12:48         ` Christian Couder
2019-03-10  6:05 ` [GSoC][PATCH] tests: avoid using pipes Christian Couder
2019-03-10  8:27   ` ttjtftx
2019-03-10 15:05     ` Christian Couder
     [not found]       ` <CAOAu_YL8heWLSznRV8pjLkRZBOEth_7CSmftupx+4+SSx5yztw@mail.gmail.com>
2019-03-11 16:45         ` Fwd: " jonathan chang

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