Re: do'.\dir\file' under -T on Windows

Shouldn't perl -T -e"do'./t\t.pl'" and perl -T -e"do'.\t\t.pl'" do the same thing

Yes. "/" and "\" are equivalent in Windows paths.

I can replicate the problem with ActivePerl 5.6.0, 5.6.1, 5.8.0, 5.8.8, 5.10.0.

Seems the logic for whether @INC should be used or not is broken. Under -T, @INC doesn't contain ".", and do'.\t\t.pl' is using @INC instead of the cd.

(and print 'hi').

Seems so. 5.8.8 on linux:

$ perl -le'@INC=(); do "t/t.pl"'

$ perl -le'@INC=(); do "./t/t.pl"'
hi

$ perl -T -le'@INC=(); do "t/t.pl"'

$ perl -T -le'@INC=(); do "./t/t.pl"'
hi
[download]

Update: Added comparison to linux and explanation of problem.

Comment on Re: do'.\dir\file' under -T on Windows Select or Download Code

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Re^2: do'.\dir\file' under -T on Windows by Bloodnok (Vicar) on Feb 25, 2009 at 16:19 UTC
Maybe perl is emulating one of the classic *NIX security fixes (removing the current working directory from the path) in `@INC` when run in taint checking mode... Just a thought ... A user level that continues to overstate my experience :-))	[reply] [d/l]
Re^3: do'.\dir\file' under -T on Windows by ikegami (Patriarch) on Feb 25, 2009 at 17:01 UTC
If a taint check for relative paths were to be added, it would throw an exception rather than setting `$!` to file not found. Note that this taint check would be a departure from the current model which allows the current directory to be used. `$ cat script.pl #!/usr/bin/perl print "unsafe?\n"; $ perl -T -e'$ENV{PATH}=""; system "script.pl";' unsafe?` [download] `$ cat Mod.pm print "unsafe?\n"; 1; $ perl -T -e'@INC = "."; require Mod;' unsafe?` [download] Sounds like a pretty good idea to me, though. It would break stuff, but nothing that can't be fixed.	[reply] [d/l] [select]
Re^4: do'.\dir\file' under -T on Windows by Anonymous Monk on Feb 26, 2009 at 07:58 UTC
Thanks a lot, I sent a description/testcase to perlbug@perl.org . Regards, Christoph	[reply]
Re^5: do'.\dir\file' under -T on Windows by lamprecht (Friar) on Feb 26, 2009 at 08:03 UTC
Re^3: do'.\dir\file' under -T on Windows by ikegami (Patriarch) on Feb 25, 2009 at 16:30 UTC
That's fine. The problem isn't that "`.`" isn't present in `@INC`, it's that `@INC` is used at all. The documented behaviour is to use `@INC`, but that's clearly not what other systems do when the path can't be a module path, or even on Windows when "`/`" is used as the separator. I'm not sure how "looks like a module path" is defined, but it's obviously buggy.	[reply] [d/l] [select]