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Date: Fri, 11 Mar 2005 16:45:31 -0800
From: Yitzchak Scott-Thoennes <sthoenna AT efn DOT org>
To: cygwin AT cygwin DOT com, perl5-porters AT perl DOT org
Subject: Re: Problem with the "-r" test in Perl 5.8.6-4
Message-ID: <20050312004530.GA800@efn.org>
Mail-Followup-To: Yitzchak Scott-Thoennes <sthoenna AT efn DOT org>, cygwin AT cygwin DOT com, perl5-porters AT perl DOT org
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On Fri, Mar 11, 2005 at 06:12:58PM -0500, Igor Pechtchanski wrote:
> On Fri, 11 Mar 2005, Yitzchak Scott-Thoennes wrote:
> 
> > On Thu, Mar 10, 2005 at 08:44:40PM -0500, Igor Pechtchanski wrote:
> > > Hi,
> > >
> > > I'm having trouble with Perl 5.8.6-4 under Cygwin 1.5.12.
> > >
> > > $ perl -e 'exit !(-r $ARGV[0])' /cygdrive/c/Program\ Files/ThinkPad/Utilities && echo "yep"
> > > $ test -r /cygdrive/c/Program\ Files/ThinkPad/Utilities && echo "yep"
> > > yep
> > >
> > > Is this behavior by design, or does perl actually check ACLs and something
> > > is wrong with my installation?
> > > 	Igor
> >
> > perldoc -f -r:
> >
> >               The interpretation of the file permission operators "-r", "-R",
> >               "-w", "-W", "-x", and "-X" is by default based solely on the
> >               mode of the file and the uids and gids of the user.  There may
> >               be other reasons you can't actually read, write, or execute the
> >               file.  Such reasons may be for example network filesystem
> >               access controls, ACLs (access control lists), read-only
> >               filesystems, and unrecognized executable formats.
> >
> > You can try the filetest pragma: use filetest 'access';
> > see perldoc filetest.
> 
> I see.  So basically this isn't likely to change in Perl, and so is a bug
> in the program that uses -r here.  I'll report this as a bug, then.
> Thanks,
> 	Igor

There was some discussion about this a while ago; a quick read of
http://guest:guest AT rt DOT perl DOT org/rt3/Ticket/Display.html?id=30885
makes me think AIX was changed to always use access; perhaps doing
so for cygwin would also be an option.  I'm not sure why the original
call was made to not use access() by default where available.

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