From: Johannes Sixt <j6t@kdbg.org>
To: "Jonathan Nieder" <jrnieder@gmail.com>, "René Scharfe" <l.s.r@web.de>
Cc: Git List <git@vger.kernel.org>,
Benoit Lecocq <benoit@openbsd.org>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] t1002: stop using sum(1)
Date: Tue, 15 Aug 2017 08:27:35 +0200 [thread overview]
Message-ID: <53a9a3cd-f814-47a3-cc9b-977f9107614c@kdbg.org> (raw)
In-Reply-To: <20170815004546.GA78174@aiede.mtv.corp.google.com>
Am 15.08.2017 um 02:46 schrieb Jonathan Nieder:
> Hi,
>
> René Scharfe wrote:
>
>> sum(1) is a command for calculating checksums of the contents of files.
>> It was part of early editions of Unix ("Research Unix", 1972/1973, [1]).
>> cksum(1) appeared in 4.4BSD (1993) as a replacement [2], and became part
>> of POSIX.1-2008 [3]. OpenBSD 5.6 (2014) removed sum(1).
>>
>> We only use sum(1) in t1002 to check for changes in three files. On
>> MinGW we use md5sum(1) instead. We could switch to the standard command
>> cksum(1) for all platforms; MinGW comes with GNU coreutils now, which
>> provides sum(1), cksum(1) and md5sum(1). Use our standard method for
>> checking for file changes instead: test_cmp.
>>
>> It's more convenient because it shows differences nicely, it's faster on
>> MinGW because we have a special implementation there based only on
>> shell-internal commands, it's simpler as it allows us to avoid stripping
>> out unnecessary entries from the checksum file using grep(1), and it's
>> more consistent with the rest of the test suite.
>>
>> We already compare changed files with their expected new contents using
>> diff(1), so we don't need to check with "test_must_fail test_cmp" if
>> they differ from their original state. A later patch could convert the
>> direct diff(1) calls to test_cmp as well.
>>
>> With all sum(1) calls gone, remove the MinGW-specific implementation
>> from test-lib.sh as well.
>>
>> [1] http://minnie.tuhs.org/cgi-bin/utree.pl?file=V3/man/man1/sum.1
>> [2] http://minnie.tuhs.org/cgi-bin/utree.pl?file=4.4BSD/usr/share/man/cat1/cksum.0
>> [3] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cksum.html
>> ---
>> t/t1002-read-tree-m-u-2way.sh | 67 ++++++++++++++++++++++---------------------
>> t/test-lib.sh | 3 --
>> 2 files changed, 35 insertions(+), 35 deletions(-)
>
> Nicely analyzed. May we forge your sign-off?
>
> [...]
>> --- a/t/t1002-read-tree-m-u-2way.sh
>> +++ b/t/t1002-read-tree-m-u-2way.sh
> [...]
>> @@ -132,8 +138,8 @@ test_expect_success \
>> git ls-files --stage >7.out &&
>> test_cmp M.out 7.out &&
>> check_cache_at frotz dirty &&
>> - sum bozbar frotz nitfol >actual7.sum &&
>> - if cmp M.sum actual7.sum; then false; else :; fi &&
>> + test_cmp bozbar.M bozbar &&
>> + test_cmp nitfol.M nitfol &&
>
> This one is strange. What is that '! cmp' trying to check for?
> Does the replacement capture the same thing?
>
> E.g., does it need a '! test_cmp frotz.M frotz &&' line?
In the context that you stripped a 'diff frotz frotz1' occurs, i.e., a
check for the expected content of the file whose content changes.
Together with the new test_cmp lines, the new text is a stricter check
than we have in the old text.
The patch looks good.
Reviewed-by: Johannes Sixt <j6t@kdbg.org>
-- Hannes
next prev parent reply other threads:[~2017-08-15 6:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-14 20:16 [PATCH] t1002: stop using sum(1) René Scharfe
2017-08-14 20:35 ` Junio C Hamano
2017-08-15 0:46 ` Jonathan Nieder
2017-08-15 6:27 ` Johannes Sixt [this message]
2017-08-15 14:43 ` René Scharfe
2017-08-15 14:37 ` René Scharfe
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