Changes in process spawning break perl system() function

Changes in process spawning break perl system() function

[LRN]

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How to reproduce:
1) create a shell script (say, /usr/bin/shellscript) containing this:

#!/bin/sh
echo ${0##*/}

2) create a symlink (say, /usr/bin/asymlink) that points to shellscript

3) create a perl script (say, /usr/bin/perlscript) containing this:

#! /usr/bin/perl -w
system '/usr/bin/asymlink';

4) run /usr/bin/perlscript

Expected results:
"asymlink" should be echoed by the shellscript when it is run by perlscript

Actual results:
"shellscript" is echoed instead

This affects 1.7.35.

I've tried various cygwin dll snapshots, everything is fine (symlink name is
echoed) with cygwin1-20150210.dll, cygwin1-20150211.dll breaks things first (a
full DOS path to shellscript is echoed), then from cygwin1-20150215.dll and
onward the target script name is echoed, as described above.

Symlink can be a Cygwin symlink or a native symlink, doesn't matter.

The use-case for this is autoconf wrapper (a shell script) that is being run by
autoreconf (a perl script) and uses the contents of $0 to find different
versions of autoconf, expecting $0 to be something like /usr/bin/autoconf, but
getting things like /usr/share/autotools/ac-wrapper.sh instead.

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Re: Changes in process spawning break perl system() function

[Achim Gratz]

LRN <lrn1986 <at> gmail.com> writes:
> This affects 1.7.35.

I can confirm this for the latest snapshot also:
CYGWIN_NT-6.3 CYGWIN 1.7.36(0.287/5/3) 2015-03-11 12:02 x86_64 Cygwin


Regards,
Achim.


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Re: Changes in process spawning break perl system() function

[Corinna Vinschen]

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On Mar 17 03:34, LRN wrote:
> How to reproduce:
> 1) create a shell script (say, /usr/bin/shellscript) containing this:
> 
> #!/bin/sh
> echo ${0##*/}
> 
> 2) create a symlink (say, /usr/bin/asymlink) that points to shellscript
> 
> 3) create a perl script (say, /usr/bin/perlscript) containing this:
> 
> #! /usr/bin/perl -w
> system '/usr/bin/asymlink';
> 
> 4) run /usr/bin/perlscript
> 
> Expected results:
> "asymlink" should be echoed by the shellscript when it is run by perlscript
> 
> Actual results:
> "shellscript" is echoed instead
> 
> This affects 1.7.35.

Thanks for the report.  I applied a fix for that and uploaded new
snapshots to https://cygwin.com/snapshots/

Could you please try them and report back?


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: Changes in process spawning break perl system() function

[LRN]

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On 17.03.2015 13:51, Corinna Vinschen wrote:
> On Mar 17 03:34, LRN wrote:
>> How to reproduce:
>> 1) create a shell script (say, /usr/bin/shellscript) containing this:
>>
>> #!/bin/sh
>> echo ${0##*/}
>>
>> 2) create a symlink (say, /usr/bin/asymlink) that points to shellscript
>>
>> 3) create a perl script (say, /usr/bin/perlscript) containing this:
>>
>> #! /usr/bin/perl -w
>> system '/usr/bin/asymlink';
>>
>> 4) run /usr/bin/perlscript
>>
>> Expected results:
>> "asymlink" should be echoed by the shellscript when it is run by perlscript
>>
>> Actual results:
>> "shellscript" is echoed instead
>>
>> This affects 1.7.35.
> 
> Thanks for the report.  I applied a fix for that and uploaded new
> snapshots to https://cygwin.com/snapshots/
> 
> Could you please try them and report back?
> 
> 

Tried cygwin1-20150317.dll, the bug is fixed.


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Re: Changes in process spawning break perl system() function

[Corinna Vinschen]

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On Mar 17 14:00, LRN wrote:
> On 17.03.2015 13:51, Corinna Vinschen wrote:
> > On Mar 17 03:34, LRN wrote:
> >> How to reproduce:
> >> 1) create a shell script (say, /usr/bin/shellscript) containing this:
> >>
> >> #!/bin/sh
> >> echo ${0##*/}
> >>
> >> 2) create a symlink (say, /usr/bin/asymlink) that points to shellscript
> >>
> >> 3) create a perl script (say, /usr/bin/perlscript) containing this:
> >>
> >> #! /usr/bin/perl -w
> >> system '/usr/bin/asymlink';
> >>
> >> 4) run /usr/bin/perlscript
> >>
> >> Expected results:
> >> "asymlink" should be echoed by the shellscript when it is run by perlscript
> >>
> >> Actual results:
> >> "shellscript" is echoed instead
> >>
> >> This affects 1.7.35.
> > 
> > Thanks for the report.  I applied a fix for that and uploaded new
> > snapshots to https://cygwin.com/snapshots/
> > 
> > Could you please try them and report back?
> > 
> > 
> 
> Tried cygwin1-20150317.dll, the bug is fixed.

Thanks for testing!


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: Changes in process spawning break perl system() function

[Achim Gratz]

Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> Thanks for the report.  I applied a fix for that and uploaded new
> snapshots to https://cygwin.com/snapshots/
> 
> Could you please try them and report back?

Fix confirmed.


Regards,
Achim


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