Date: Sat, 23 Apr 2011 22:01:32 -0700 From: Doug Barton <dougb@FreeBSD.org> To: Jilles Tjoelker <jilles@stack.nl> Cc: Garrett Cooper <yanegomi@gmail.com>, "freebsd-rc@FreeBSD.org" <freebsd-rc@freebsd.org>, "ggg_mail@inbox.ru" <ggg_mail@inbox.ru> Subject: Re: MFCing sh(1) substitution changes Message-ID: <4DB3AEAC.9090201@FreeBSD.org> In-Reply-To: <20110423215853.GA62363@stack.nl> References: <201012272253.oBRMrH7k025331@freefall.freebsd.org> <1232C1B4-DA64-4332-906E-288B8C1E39FE@gmail.com> <4D1A3DFE.8090009@FreeBSD.org> <AANLkTinRSC_pBVdK_m8Hrk=_32mjMZDSc77__5iUyV_Z@mail.gmail.com> <4DACC455.4040603@FreeBSD.org> <20110421232840.GA29218@stack.nl> <4DB0D081.6090900@FreeBSD.org> <20110423104230.GA57811@stack.nl> <4DB2F853.3020202@FreeBSD.org> <20110423215853.GA62363@stack.nl>
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On 04/23/2011 14:58, Jilles Tjoelker wrote:
> On Sat, Apr 23, 2011 at 09:03:31AM -0700, Doug Barton wrote:
>> On 04/23/2011 03:42, Jilles Tjoelker wrote:
>>> On Thu, Apr 21, 2011 at 05:49:05PM -0700, Doug Barton wrote:
>>>> On 04/21/2011 16:28, Jilles Tjoelker wrote:
>>>>>> line="/${line%%[\"\;]*}"
>>>
>>>>> The meaning of this line depends on the version of sh(1). The correct
>>>>> interpretation, used by sh in 9-current and most other shells, is to
>>>>> strip from the first double-quote or semicolon onwards. However, sh in
>>>>> older FreeBSD versions will strip from the first backslash, double-quote
>>>>> or semicolon onwards.
>>>
>>>>> If the 9-current behaviour is desired for all FreeBSD versions, use:
>>>>> line=/${line%%[\"\;]*}
>>>
>>>> I think it's incredibly unlikely that there would actually be a
>>>> backslash in the text, and even if there was, it should be ok to strip
>>>> from there.
>>>
>>> Even if there is, it seems bad if this differs between 8.x and 9.x.
>
>> So MFC your changes. :)
>
> Hmm, I think that is a good reason not to MFC them, not a reason to MFC
> them. If you write something that differs between 8.x and 9.x, although
> it is very unlikely to have practical consequences, I can imagine that
> there are scripts where it actually matters and that will break with the
> 9.x behaviour. If so, I'd prefer that the breakage is noticed on a major
> FreeBSD version upgrade and not on a minor version upgrade.
Hence the smiley.
--
Nothin' ever doesn't change, but nothin' changes much.
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