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Subject: bug#9614: date ignoring wrong TZ values
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Date: Tue, 27 Sep 2011 16:09:13 +0200
From: Sandro Santilli <strk@HIDDEN>
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I've been puzzled by date(1) giving weird results
when setting TZ to values unknown by zoneinfo.
As far as:
$ TZ=Fake date
Tue Sep 27 14:06:32 Fake 2011
It would be more helpful if the command raised an error
or warning about "unknown" timezones rather than giving
random dates.
It's particularly anonying when the same TZ _reported_
by the command isn't recognized in input:
$ date
Tue Sep 27 16:08:13 CEST 2011
$ TZ=CEST date
Tue Sep 27 14:08:13 CEST 2011
Thanks for making a clock available for everyone, btw :)
--strk;
() Free GIS & Flash consultant/developer
/\ http://strk.keybit.net/services.html
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.427 (Entity 5.427) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Sandro Santilli <strk@HIDDEN> Subject: bug#9614: Acknowledgement (date ignoring wrong TZ values) Message-ID: <handler.9614.B.13171400379900.ack <at> debbugs.gnu.org> References: <20110927140913.GB17136@gnash> X-Gnu-PR-Message: ack 9614 X-Gnu-PR-Package: coreutils Reply-To: 9614 <at> debbugs.gnu.org Date: Tue, 27 Sep 2011 16:14:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 9614 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 9614: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D9614 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#9614: date ignoring wrong TZ values
Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
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On 09/27/2011 03:09 PM, Sandro Santilli wrote:
> I've been puzzled by date(1) giving weird results
> when setting TZ to values unknown by zoneinfo.
>
> As far as:
>
> $ TZ=Fake date
> Tue Sep 27 14:06:32 Fake 2011
Yes, that is per POSIX.
One can specify info about the timezone in TZ
like TZ="Fake+6", so one couldn't start warning about that.
> It would be more helpful if the command raised an error
> or warning about "unknown" timezones rather than giving
> random dates.
>
> It's particularly anonying when the same TZ _reported_
> by the command isn't recognized in input:
>
> $ date
> Tue Sep 27 16:08:13 CEST 2011
>
> $ TZ=CEST date
> Tue Sep 27 14:08:13 CEST 2011
>
> Thanks for making a clock available for everyone, btw :)
Wow you learn something everyday.
I thought the TZ=XYZ was just treated as UTC+0
to allow one to specify TZ=XYZ+4 etc. as
an offset from UTC.
But in fact some TZ values are matched,
as can be seen for CET here on my system:
$ TZ=CEST date
Tue Sep 27 18:03:05 CEST 2011
$ TZ=CET date
Tue Sep 27 20:03:09 CEST 2011
$ date
Tue Sep 27 19:03:17 IST 2011
There are a few three letter codes on my
system at /usr/share/zoneinfo/
(maybe these are the only non ambiguous ones?)
Hmm, how about we warn if an unmatched code (without a /)
is specified, without any other info like UTC offset etc.?
cheers,
Pádraig.
X-Loop: help-debbugs@HIDDEN
Subject: bug#9614: date ignoring wrong TZ values
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Date: Tue, 27 Sep 2011 21:37:12 +0200
From: Sandro Santilli <strk@HIDDEN>
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On Tue, Sep 27, 2011 at 07:19:12PM +0100, Pádraig Brady wrote:
> On 09/27/2011 03:09 PM, Sandro Santilli wrote:
> > I've been puzzled by date(1) giving weird results
> > when setting TZ to values unknown by zoneinfo.
> >
> > As far as:
> >
> > $ TZ=Fake date
> > Tue Sep 27 14:06:32 Fake 2011
>
> Yes, that is per POSIX.
> One can specify info about the timezone in TZ
> like TZ="Fake+6", so one couldn't start warning about that.
>
> > It would be more helpful if the command raised an error
> > or warning about "unknown" timezones rather than giving
> > random dates.
> >
> > It's particularly anonying when the same TZ _reported_
> > by the command isn't recognized in input:
> >
> > $ date
> > Tue Sep 27 16:08:13 CEST 2011
> >
> > $ TZ=CEST date
> > Tue Sep 27 14:08:13 CEST 2011
> >
> > Thanks for making a clock available for everyone, btw :)
>
> Wow you learn something everyday.
> I thought the TZ=XYZ was just treated as UTC+0
> to allow one to specify TZ=XYZ+4 etc. as
> an offset from UTC.
>
> But in fact some TZ values are matched,
> as can be seen for CET here on my system:
>
> $ TZ=CEST date
> Tue Sep 27 18:03:05 CEST 2011
> $ TZ=CET date
> Tue Sep 27 20:03:09 CEST 2011
> $ date
> Tue Sep 27 19:03:17 IST 2011
>
> There are a few three letter codes on my
> system at /usr/share/zoneinfo/
> (maybe these are the only non ambiguous ones?)
>
> Hmm, how about we warn if an unmatched code (without a /)
> is specified, without any other info like UTC offset etc.?
Better than nothing, I guess.
--strk;
() Free GIS & Flash consultant/developer
/\ http://strk.keybit.net/services.html
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Subject: bug#9614: date ignoring wrong TZ values
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On 09/27/2011 07:19 PM, Pádraig Brady wrote:
> On 09/27/2011 03:09 PM, Sandro Santilli wrote:
>> I've been puzzled by date(1) giving weird results
>> when setting TZ to values unknown by zoneinfo.
>>
>> As far as:
>>
>> $ TZ=Fake date
>> Tue Sep 27 14:06:32 Fake 2011
>
> Yes, that is per POSIX.
> One can specify info about the timezone in TZ
> like TZ="Fake+6", so one couldn't start warning about that.
>
>> It would be more helpful if the command raised an error
>> or warning about "unknown" timezones rather than giving
>> random dates.
>>
>> It's particularly anonying when the same TZ _reported_
>> by the command isn't recognized in input:
>>
>> $ date
>> Tue Sep 27 16:08:13 CEST 2011
>>
>> $ TZ=CEST date
>> Tue Sep 27 14:08:13 CEST 2011
>>
>> Thanks for making a clock available for everyone, btw :)
>
> Wow you learn something everyday.
> I thought the TZ=XYZ was just treated as UTC+0
> to allow one to specify TZ=XYZ+4 etc. as
> an offset from UTC.
>
> But in fact some TZ values are matched,
> as can be seen for CET here on my system:
>
> $ TZ=CEST date
> Tue Sep 27 18:03:05 CEST 2011
> $ TZ=CET date
> Tue Sep 27 20:03:09 CEST 2011
> $ date
> Tue Sep 27 19:03:17 IST 2011
>
> There are a few three letter codes on my
> system at /usr/share/zoneinfo/
> (maybe these are the only non ambiguous ones?)
>
> Hmm, how about we warn if an unmatched code (without a /)
> is specified, without any other info like UTC offset etc.?
Actually we could warn about unmatched codes containing / too.
I just noticed more inconsistencies, for codes that are matched:
$ TZ=NZ+1 date # No zone reported
Tue Sep 27 21:03:06 2011
$ TZ=CET+1 date # Zone reported
Tue Sep 27 20:03:16 CET 2011
thanks,
Pádraig.
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Pádraig Brady <P@HIDDEN> writes:
> On 09/27/2011 03:09 PM, Sandro Santilli wrote:
>> I've been puzzled by date(1) giving weird results
>> when setting TZ to values unknown by zoneinfo.
>>
>> As far as:
>>
>> $ TZ=Fake date
>> Tue Sep 27 14:06:32 Fake 2011
>
> Yes, that is per POSIX.
This is not a POSIX format, since it lacks the offset.
Andreas.
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Pádraig Brady <P@HIDDEN> writes:
> $ TZ=NZ+1 date # No zone reported
This is undefined. A zone name in a POSIX time zone must have at least
three letters.
Andreas.
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On 09/27/2011 10:47 PM, Andreas Schwab wrote:
> Pádraig Brady <P@HIDDEN> writes:
>
>> $ TZ=NZ+1 date # No zone reported
>
> This is undefined. A zone name in a POSIX time zone must have at least
> three letters.
I considered that, but it seems inconsequential in this case.
I'd advise people to stay clear of these abbreviations and offsets completely.
$ TZ=GB-Eire+1 date
Tue Sep 27 22:02:49 2011
$ TZ=Japan+1 date
Tue Sep 27 21:02:54 Japan 2011
$ TZ=Japan date
Wed Sep 28 07:03:53 JST 2011
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P=C3=A1draig Brady <P@HIDDEN> writes:
> $ TZ=3DGB-Eire+1 date
A POSIX timezone name cannot have dashes.
> $ TZ=3DJapan+1 date
This is a well-formed POSIX timezone.
> $ TZ=3DJapan date
This is a non-POSIX timezone that happens to match an Olson timezone.
Andreas.
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On Wed, Sep 28, 2011 at 12:19:22AM +0200, Andreas Schwab wrote:
> Pádraig Brady <P@HIDDEN> writes:
>
> > $ TZ=GB-Eire+1 date
>
> A POSIX timezone name cannot have dashes.
Doesn't all these "can't have" and "undefined" specs mean
we do can warn or error out w/out breakin POSIX compatibility ?
> > $ TZ=Japan+1 date
>
> This is a well-formed POSIX timezone.
Meaning UTC+1 ?
> > $ TZ=Japan date
>
> This is a non-POSIX timezone that happens to match an Olson timezone.
non-POSIX means illegal ?
--strk;
() Free GIS & Flash consultant/developer
/\ http://strk.keybit.net/services.html
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Subject: bug#9614: date ignoring wrong TZ values
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Date: Wed, 28 Sep 2011 07:44:51 +0200
From: Sandro Santilli <strk@HIDDEN>
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On Tue, Sep 27, 2011 at 11:52:22PM +0200, Andreas Schwab wrote:
> Pádraig Brady <P@HIDDEN> writes:
>
> > On 09/27/2011 03:09 PM, Sandro Santilli wrote:
> >> I've been puzzled by date(1) giving weird results
> >> when setting TZ to values unknown by zoneinfo.
> >>
> >> As far as:
> >>
> >> $ TZ=Fake date
> >> Tue Sep 27 14:06:32 Fake 2011
> >
> > Yes, that is per POSIX.
>
> This is not a POSIX format, since it lacks the offset.
A warning/error message with hint on how to correctly form
the string would be very friendly for users.
--strk;
() Free GIS & Flash consultant/developer
/\ http://strk.keybit.net/services.html
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Subject: bug#9614: date ignoring wrong TZ values
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On 09/27/11 22:44, Sandro Santilli wrote:
> A warning/error message with hint on how to correctly form
> the string would be very friendly for users
Unfortunately, there's no portable way to determine
which TZ values are supported on the current platform.
One cannot even reliably determine whether the current TZ
value is supported. So it's not clear how that warning
would be generated.
Also, lots of programs use TZ; it's not just "date".
X-Loop: help-debbugs@HIDDEN
Subject: bug#9614: date ignoring wrong TZ values
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Sandro Santilli <strk@HIDDEN> writes:
> On Wed, Sep 28, 2011 at 12:19:22AM +0200, Andreas Schwab wrote:
>> Pádraig Brady <P@HIDDEN> writes:
>>
>> > $ TZ=Japan+1 date
>>
>> This is a well-formed POSIX timezone.
>
> Meaning UTC+1 ?
The timzone name has no meaning, only the offset matters.
>> > $ TZ=Japan date
>>
>> This is a non-POSIX timezone that happens to match an Olson timezone.
>
> non-POSIX means illegal ?
It means unspecified (but not undefined), ie. the implementation may
reject it or do something sensible.
Andreas.
--
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Subject: bug#9614: date ignoring wrong TZ values
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From: Sandro Santilli <strk@HIDDEN>
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On Wed, Sep 28, 2011 at 11:04:11PM +0200, Andreas Schwab wrote:
> Sandro Santilli <strk@HIDDEN> writes:
>
> > On Wed, Sep 28, 2011 at 12:19:22AM +0200, Andreas Schwab wrote:
> >> Pádraig Brady <P@HIDDEN> writes:
> >>
> >> > $ TZ=Japan+1 date
> >>
> >> This is a well-formed POSIX timezone.
> >
> > Meaning UTC+1 ?
>
> The timzone name has no meaning, only the offset matters.
Offset from which date ?
> >> > $ TZ=Japan date
> >>
> >> This is a non-POSIX timezone that happens to match an Olson timezone.
> >
> > non-POSIX means illegal ?
>
> It means unspecified (but not undefined), ie. the implementation may
> reject it or do something sensible.
So it can also print a warning ?
--strk;
() Free GIS & Flash consultant/developer
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Subject: bug#9614: date ignoring wrong TZ values
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References: <20110927140913.GB17136@gnash> <4E8213A0.5010608@HIDDEN>
<m2fwjhejqh.fsf@HIDDEN> <20110928054451.GB2083@xtp>
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From: Assaf Gordon <assafgordon@HIDDEN>
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Date: Mon, 15 Oct 2018 08:11:44 -0600
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tags 9614 wontfix
severity 9614 wishlist
retitle 9614 date: warn on invalid TZ string (was: date ignoring wrong
TZ values)
stop
(triaging old bugs)
Hello,
On 27/09/11 11:48 PM, Paul Eggert wrote:
> On 09/27/11 22:44, Sandro Santilli wrote:
>> A warning/error message with hint on how to correctly form
>> the string would be very friendly for users
>
> Unfortunately, there's no portable way to determine
> which TZ values are supported on the current platform.
> One cannot even reliably determine whether the current TZ
> value is supported. So it's not clear how that warning
> would be generated.
>
> Also, lots of programs use TZ; it's not just "date".
>
Based on the above, and no follow-ups in 7 years,
I'm closing this bug. Discussion can continue by replying to this thread.
-assaf
Received: (at control) by debbugs.gnu.org; 15 Oct 2018 14:11:55 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 15 10:11:54 2018 Received: from localhost ([127.0.0.1]:50854 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1gC3b8-00073y-KI for submit <at> debbugs.gnu.org; Mon, 15 Oct 2018 10:11:54 -0400 Received: from mail-pf1-f179.google.com ([209.85.210.179]:33239) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <assafgordon@HIDDEN>) id 1gC3b6-00073g-Uw; Mon, 15 Oct 2018 10:11:53 -0400 Received: by mail-pf1-f179.google.com with SMTP id 78-v6so7367408pfq.0; Mon, 15 Oct 2018 07:11:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=vad/RXOpq44OA/0ZTwb598wwAn8rUk5ITlObm62snX9kg9Q/oc0rDjIw66w83r9cp6 ShL4lu5O+vnYJuyE8T8BqZCx9SLUccqXdrfWsuwcvw5VjNtwKtbc6Ny0nRyu2CLtm+xE fY3X0e74LiP/4HcVYf+G7Qck78jRU/KHo/5Uznf8SFGjE+l4d3H+ssE6j57JL7yShLWQ G4AfNVgCTHsTZoSE49SQEiZByxL4eSp0F39osBIh59flYoHAyDlAZLrx7YeIKursEK1G Bo37e42Urvig5xnx0dWVmuzKywfKKg7vAeN2BLr/TVaCD8fL0XtAx1mSkm5JYSAvFgxq WqUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=hhBrB6IWyX3x1l2w5/JxEWt9yjgkhLRCHsDZWSrj3FzYMYJO81p+1GOs3fznn4a7xy UBVBW2ReksjNzZWFH4ly6BzS2uEXynjdCHXiBJ8DTJ6WgwyzPVlEcpWFd7P+bQpRVqK6 iVUyj5HvhJ1HNqvJ5pO5iY3OWWHECvJbbEGCdLOPvIEDLFe90bAN1RBWUKTONW19dJQf X98xuuyB3tTS0TeNrAzP7mmxiP/Rnc6KwY+ATPtkycBXOzQZv7uqt87FIixt5iANTyd/ vpE7n024EmJtF/z7iMssUVwxawO8Q5XdyF/ksRJagsbrjgggAKz8GaO/N8oSJ5oRAZl+ ar9A== X-Gm-Message-State: ABuFfoiMMmpwqDVS7oI8pPrga+dFMcefEk6Lf13yUuzaTqqziQ6Jy2nR gdJPOGVPS0wrBwa7tFs/SM+/c3uyFT8= X-Google-Smtp-Source: ACcGV62LMksQZjJESoleSp1LMVhjuHC722NWHGH5TF6KyHvdXAQq73Bukpn+GTgTzSAceaOGt2DUOQ== X-Received: by 2002:a62:1112:: with SMTP id z18-v6mr17788088pfi.200.1539612706713; Mon, 15 Oct 2018 07:11:46 -0700 (PDT) Received: from tomato.housegordon.com (moose.housegordon.com. [184.68.105.38]) by smtp.googlemail.com with ESMTPSA id y144-v6sm15909228pfb.81.2018.10.15.07.11.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Oct 2018 07:11:45 -0700 (PDT) Subject: Re: bug#9614: date ignoring wrong TZ values To: Paul Eggert <eggert@HIDDEN>, Sandro Santilli <strk@HIDDEN> References: <20110927140913.GB17136@gnash> <4E8213A0.5010608@HIDDEN> <m2fwjhejqh.fsf@HIDDEN> <20110928054451.GB2083@xtp> <4E82B533.2040709@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <778a0599-b204-810d-7795-7902d2b751ad@HIDDEN> Date: Mon, 15 Oct 2018 08:11:44 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <4E82B533.2040709@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 9614 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) tags 9614 wontfix severity 9614 wishlist retitle 9614 date: warn on invalid TZ string (was: date ignoring wrong TZ values) stop (triaging old bugs) Hello, On 27/09/11 11:48 PM, Paul Eggert wrote: > On 09/27/11 22:44, Sandro Santilli wrote: >> A warning/error message with hint on how to correctly form >> the string would be very friendly for users > > Unfortunately, there's no portable way to determine > which TZ values are supported on the current platform. > One cannot even reliably determine whether the current TZ > value is supported. So it's not clear how that warning > would be generated. > > Also, lots of programs use TZ; it's not just "date". > Based on the above, and no follow-ups in 7 years, I'm closing this bug. Discussion can continue by replying to this thread. -assaf
Received: (at control) by debbugs.gnu.org; 15 Oct 2018 14:11:55 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 15 10:11:54 2018 Received: from localhost ([127.0.0.1]:50854 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1gC3b8-00073y-KI for submit <at> debbugs.gnu.org; Mon, 15 Oct 2018 10:11:54 -0400 Received: from mail-pf1-f179.google.com ([209.85.210.179]:33239) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <assafgordon@HIDDEN>) id 1gC3b6-00073g-Uw; Mon, 15 Oct 2018 10:11:53 -0400 Received: by mail-pf1-f179.google.com with SMTP id 78-v6so7367408pfq.0; Mon, 15 Oct 2018 07:11:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=vad/RXOpq44OA/0ZTwb598wwAn8rUk5ITlObm62snX9kg9Q/oc0rDjIw66w83r9cp6 ShL4lu5O+vnYJuyE8T8BqZCx9SLUccqXdrfWsuwcvw5VjNtwKtbc6Ny0nRyu2CLtm+xE fY3X0e74LiP/4HcVYf+G7Qck78jRU/KHo/5Uznf8SFGjE+l4d3H+ssE6j57JL7yShLWQ G4AfNVgCTHsTZoSE49SQEiZByxL4eSp0F39osBIh59flYoHAyDlAZLrx7YeIKursEK1G Bo37e42Urvig5xnx0dWVmuzKywfKKg7vAeN2BLr/TVaCD8fL0XtAx1mSkm5JYSAvFgxq WqUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=hhBrB6IWyX3x1l2w5/JxEWt9yjgkhLRCHsDZWSrj3FzYMYJO81p+1GOs3fznn4a7xy UBVBW2ReksjNzZWFH4ly6BzS2uEXynjdCHXiBJ8DTJ6WgwyzPVlEcpWFd7P+bQpRVqK6 iVUyj5HvhJ1HNqvJ5pO5iY3OWWHECvJbbEGCdLOPvIEDLFe90bAN1RBWUKTONW19dJQf X98xuuyB3tTS0TeNrAzP7mmxiP/Rnc6KwY+ATPtkycBXOzQZv7uqt87FIixt5iANTyd/ vpE7n024EmJtF/z7iMssUVwxawO8Q5XdyF/ksRJagsbrjgggAKz8GaO/N8oSJ5oRAZl+ ar9A== X-Gm-Message-State: ABuFfoiMMmpwqDVS7oI8pPrga+dFMcefEk6Lf13yUuzaTqqziQ6Jy2nR gdJPOGVPS0wrBwa7tFs/SM+/c3uyFT8= X-Google-Smtp-Source: ACcGV62LMksQZjJESoleSp1LMVhjuHC722NWHGH5TF6KyHvdXAQq73Bukpn+GTgTzSAceaOGt2DUOQ== X-Received: by 2002:a62:1112:: with SMTP id z18-v6mr17788088pfi.200.1539612706713; Mon, 15 Oct 2018 07:11:46 -0700 (PDT) Received: from tomato.housegordon.com (moose.housegordon.com. [184.68.105.38]) by smtp.googlemail.com with ESMTPSA id y144-v6sm15909228pfb.81.2018.10.15.07.11.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Oct 2018 07:11:45 -0700 (PDT) Subject: Re: bug#9614: date ignoring wrong TZ values To: Paul Eggert <eggert@HIDDEN>, Sandro Santilli <strk@HIDDEN> References: <20110927140913.GB17136@gnash> <4E8213A0.5010608@HIDDEN> <m2fwjhejqh.fsf@HIDDEN> <20110928054451.GB2083@xtp> <4E82B533.2040709@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <778a0599-b204-810d-7795-7902d2b751ad@HIDDEN> Date: Mon, 15 Oct 2018 08:11:44 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <4E82B533.2040709@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 9614 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) tags 9614 wontfix severity 9614 wishlist retitle 9614 date: warn on invalid TZ string (was: date ignoring wrong TZ values) stop (triaging old bugs) Hello, On 27/09/11 11:48 PM, Paul Eggert wrote: > On 09/27/11 22:44, Sandro Santilli wrote: >> A warning/error message with hint on how to correctly form >> the string would be very friendly for users > > Unfortunately, there's no portable way to determine > which TZ values are supported on the current platform. > One cannot even reliably determine whether the current TZ > value is supported. So it's not clear how that warning > would be generated. > > Also, lots of programs use TZ; it's not just "date". > Based on the above, and no follow-ups in 7 years, I'm closing this bug. Discussion can continue by replying to this thread. -assaf
Received: (at control) by debbugs.gnu.org; 15 Oct 2018 14:11:55 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 15 10:11:54 2018 Received: from localhost ([127.0.0.1]:50854 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1gC3b8-00073y-KI for submit <at> debbugs.gnu.org; Mon, 15 Oct 2018 10:11:54 -0400 Received: from mail-pf1-f179.google.com ([209.85.210.179]:33239) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <assafgordon@HIDDEN>) id 1gC3b6-00073g-Uw; Mon, 15 Oct 2018 10:11:53 -0400 Received: by mail-pf1-f179.google.com with SMTP id 78-v6so7367408pfq.0; Mon, 15 Oct 2018 07:11:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=vad/RXOpq44OA/0ZTwb598wwAn8rUk5ITlObm62snX9kg9Q/oc0rDjIw66w83r9cp6 ShL4lu5O+vnYJuyE8T8BqZCx9SLUccqXdrfWsuwcvw5VjNtwKtbc6Ny0nRyu2CLtm+xE fY3X0e74LiP/4HcVYf+G7Qck78jRU/KHo/5Uznf8SFGjE+l4d3H+ssE6j57JL7yShLWQ G4AfNVgCTHsTZoSE49SQEiZByxL4eSp0F39osBIh59flYoHAyDlAZLrx7YeIKursEK1G Bo37e42Urvig5xnx0dWVmuzKywfKKg7vAeN2BLr/TVaCD8fL0XtAx1mSkm5JYSAvFgxq WqUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=bG3O4tLInPhgDpXwnDhqpng09yQxzG4hvUjb3CbUr4o=; b=hhBrB6IWyX3x1l2w5/JxEWt9yjgkhLRCHsDZWSrj3FzYMYJO81p+1GOs3fznn4a7xy UBVBW2ReksjNzZWFH4ly6BzS2uEXynjdCHXiBJ8DTJ6WgwyzPVlEcpWFd7P+bQpRVqK6 iVUyj5HvhJ1HNqvJ5pO5iY3OWWHECvJbbEGCdLOPvIEDLFe90bAN1RBWUKTONW19dJQf X98xuuyB3tTS0TeNrAzP7mmxiP/Rnc6KwY+ATPtkycBXOzQZv7uqt87FIixt5iANTyd/ vpE7n024EmJtF/z7iMssUVwxawO8Q5XdyF/ksRJagsbrjgggAKz8GaO/N8oSJ5oRAZl+ ar9A== X-Gm-Message-State: ABuFfoiMMmpwqDVS7oI8pPrga+dFMcefEk6Lf13yUuzaTqqziQ6Jy2nR gdJPOGVPS0wrBwa7tFs/SM+/c3uyFT8= X-Google-Smtp-Source: ACcGV62LMksQZjJESoleSp1LMVhjuHC722NWHGH5TF6KyHvdXAQq73Bukpn+GTgTzSAceaOGt2DUOQ== X-Received: by 2002:a62:1112:: with SMTP id z18-v6mr17788088pfi.200.1539612706713; Mon, 15 Oct 2018 07:11:46 -0700 (PDT) Received: from tomato.housegordon.com (moose.housegordon.com. [184.68.105.38]) by smtp.googlemail.com with ESMTPSA id y144-v6sm15909228pfb.81.2018.10.15.07.11.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Oct 2018 07:11:45 -0700 (PDT) Subject: Re: bug#9614: date ignoring wrong TZ values To: Paul Eggert <eggert@HIDDEN>, Sandro Santilli <strk@HIDDEN> References: <20110927140913.GB17136@gnash> <4E8213A0.5010608@HIDDEN> <m2fwjhejqh.fsf@HIDDEN> <20110928054451.GB2083@xtp> <4E82B533.2040709@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <778a0599-b204-810d-7795-7902d2b751ad@HIDDEN> Date: Mon, 15 Oct 2018 08:11:44 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <4E82B533.2040709@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 9614 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) tags 9614 wontfix severity 9614 wishlist retitle 9614 date: warn on invalid TZ string (was: date ignoring wrong TZ values) stop (triaging old bugs) Hello, On 27/09/11 11:48 PM, Paul Eggert wrote: > On 09/27/11 22:44, Sandro Santilli wrote: >> A warning/error message with hint on how to correctly form >> the string would be very friendly for users > > Unfortunately, there's no portable way to determine > which TZ values are supported on the current platform. > One cannot even reliably determine whether the current TZ > value is supported. So it's not clear how that warning > would be generated. > > Also, lots of programs use TZ; it's not just "date". > Based on the above, and no follow-ups in 7 years, I'm closing this bug. Discussion can continue by replying to this thread. -assaf
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Subject: bug#9614: date ignoring wrong TZ values
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From: Assaf Gordon <assafgordon@HIDDEN>
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Hello,
On 2018-10-15 8:11 a.m., Assaf Gordon wrote:
> tags 9614 wontfix
> severity 9614 wishlist
Changed my mind (and noticed that Paul removed the "wontfix" tag),
so here goes...
> On 27/09/11 11:48 PM, Paul Eggert wrote:
>> On 09/27/11 22:44, Sandro Santilli wrote:
>>> A warning/error message with hint on how to correctly form
>>> the string would be very friendly for users
>>
>> Unfortunately, there's no portable way to determine
>> which TZ values are supported on the current platform.
>> One cannot even reliably determine whether the current TZ
>> value is supported. So it's not clear how that warning
>> would be generated.
>>
Attached is a crude attempt at detecting and warning about invalid
timezone strings.
First and foremost,
the code only runs when the user specify "--debug", so hopefully it
won't have any ill effects.
Second,
the goal is to detect the most common usage errors (e.g.
"America/NewYorx" or "Jamaika"), not to re-implement a fool-proof parser
for timezones.
Third,
The code runs "mostly well" on "most common" operating systems.
There sure to be cases where it doesn't work (but the "doesn't work"
part simply means that with "--debug" it might warn about invalid
timezone when it is a valid timezone that resolves to GMT).
OpenBSD is such a case.
---
With this patch, "date --debug" is able to warn about:
TZ=America/NewYorx date --debug
TZ=Europe/Lomdom date --debug
TZ=FOOBAR date --debug
date --debug -d 'TZ="Asia/Japan" 2019-01-01'
while it knows not to warn about:
TZ=Africa/Dakar date --debug # Valid GMT timezone
TZ=GB date --debug # Valid GMT timezone on most systems
TZ=FOO+0 date --debug # Valid UTC+0 timezone
The warning looks like so:
$ TZ=America/Kalgary ./src/date --debug
date: possibly invalid timezone in TZ envvar:
date: ‘America/Kalgary’
date: timezone UTC0 will be used.
Mon Dec 31 16:41:08 America 2018
The detection works well on Debian 9, Centos 7,
FreeBSD 11, NetBSD 7.1, AIX 7.2 .
OpenBSD is an example of where it doesn't work - there's no way
to differentiate between an invalid timezone and a valid GMT timezone.
But on such system, the code self-diagnoses this issue and prints
additional warnings:
$ TZ=Africa/Dakar ./src/date --debug
date: possibly invalid timezone in TZ envvar:
date: 'Africa/Dakar'
date: timezone UTC0 will be used.
date: this system has limited capabilities in detecting
date: invalid timezones. It is possible this is a valid timezone
date: in the GMT zone.
Mon Dec 31 16:43:35 GMT 2018
---
This patch includes a unit-test, but because the names of available
timezones vary so much between systems, it doesn't pass everywhere.
It is therefore marked as "very expensive".
To run it, use:
make check SUBDIRS=. TESTS=tests/misc/date-debug-TZ.pl \
RUN_VERY_EXPENSIVE_TESTS=yes
---
The heuristic code to determine if a timezone is valid or not is quite
hairy. There's likely room for improvements.
Comments and feedback and improvement suggestions are welcomed,
- assaf
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--------------246566B5007C00E3D04FFDF0--
X-Loop: help-debbugs@HIDDEN
Subject: bug#9614: date ignoring wrong TZ values
Resent-From: Paul Eggert <eggert@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-coreutils@HIDDEN
Resent-Date: Wed, 02 Jan 2019 07:09:01 +0000
Resent-Message-ID: <handler.9614.B9614.154641291521831 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
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From: Paul Eggert <eggert@HIDDEN>
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I think this implementation is heading in the wrong direction. To determine
whether a time zone string FOO is valid, a program should call tzalloc (FOO) and
sees whether that yields NULL. And if tzalloc doesn't work that way now, we
should fix tzalloc so it does. Once that happens, 'date' can simply call tzalloc
(getenv ("TZ")) to see whether the time zone setting is OK.
X-Loop: help-debbugs@HIDDEN
Subject: bug#9614: date ignoring wrong TZ values
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From: Assaf Gordon <assafgordon@HIDDEN>
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Hello Paul,
On 2019-01-02 12:08 a.m., Paul Eggert wrote:
> I think this implementation is heading in the wrong direction. To
> determine whether a time zone string FOO is valid, a program should call
> tzalloc (FOO) and sees whether that yields NULL. And if tzalloc doesn't
> work that way now, we should fix tzalloc so it does. Once that happens,
> 'date' can simply call tzalloc (getenv ("TZ")) to see whether the time
> zone setting is OK.
Thanks for the feedback.
Asking for a bit more details, clarifications...
If I understand correctly, the current gnulib implementation
of "tzalloc" is very minimal and without any checks.
Basically the only way for it to return NULL is if the malloc failed.
https://git.sv.gnu.org/cgit/gnulib.git/tree/lib/time_rz.c#n92
And previously you wrote:
> Unfortunately, there's no portable way to determine
> which TZ values are supported on the current platform.
So do you mean that:
This sort of heuristics (or another/better heuristic implementation)
should be moved into gnulib, and 'hidden' with tzalloc's very simple
interface?
(date already calls tzalloc(getenv("TZ")) but doesn't check the returned
value.)
or
gnulib's tzalloc implementation should be greatly expanded to be able
to decode the operating system's local timezome?
(or perhaps the timezone management code copied from glibc?)
or
something completely different?
thanks!
- assaf
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Subject: bug#9614: date ignoring wrong TZ values
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From: Paul Eggert <eggert@HIDDEN>
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Assaf Gordon wrote:
> gnulib's tzalloc implementation should be greatly expanded to be able
> to decode the operating system's local timezome?
> (or perhaps the timezone management code copied from glibc?)
That's what I was thinking of, except that it'd be better to extend glibc to
support tzalloc etc. That code could be shared between glibc and gnulib.
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