X2Go Bug report logs - #1133
Inconsistent Perl used by server or its agent on connect

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From: Ted Toal <twtoal@ucdavis.edu>
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Subject: Re: [X2Go-Dev] Bug#1133: Bug#1133: Inconsistent Perl used by server
 or its agent on connect
Date: Tue, 10 Jan 2017 17:48:06 -0800
References: <BF57B030-7BF4-4307-9333-49782AB84D74@ucdavis.edu>
 <7a1f025f-6a4f-9c6a-ffe6-4d18a712da86@baur-itcs.de>
 <E4861E92-0216-40D2-91E6-A6A693F5E30B@ucdavis.edu>
 <836dd91e-6bc3-35e1-3759-e66b55715b1b@baur-itcs.de>
To: Stefan Baur <X2Go-ML-1@baur-itcs.de>,
 1133@bugs.x2go.org
In-Reply-To: <836dd91e-6bc3-35e1-3759-e66b55715b1b@baur-itcs.de>
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perl has the -l option for specifying the PERL5LIB path.  That option can, and I think should, be used on the shebang of the x2go perl scripts:

#!/usr/bin/perl -l /usr/lib/perl5

or something like that.  I know the shebang line allows args.

Ted




> On Jan 10, 2017, at 3:42 PM, Stefan Baur <X2Go-ML-1@baur-itcs.de> wrote:
> 
> Ted,
> 
> let's examine a few things here:
> 
> You're saying that nxagent is doing things in Perl, and not the right
> things.  When examining the contents of the nxagent package, all I'm
> seeing wrt/ executables are bash scripts and compiled binaries, but
> nothing written in Perl.
> So the nxagent package can't be at fault.
> 
> We *do* have scripts that are written in Perl, and that might throw the
> error you quoted.  Those are e.g. in the package with the name
> x2goserver (and I wouldn't be surprised to find more of them in other
> packages that have names beginning with x2go*).
> 
> grep '^#!.*perl*' /usr/bin/x2go* returns a list of scripts that all have
> #!/usr/bin/perl as shebang, so yes, it's probably safe to say that the
> use of /usr/bin/perl as the Perl interpreter for our scripts is hardcoded.
> 
> But again, that's not a bug, but how scripting works on Linux/Unix.
> First line with shebang tells the shell which interpreter to use, so you
> don't have to prefix the script name with the name of the interpreter
> each time.
> 
> And of course, if you set a variable with a name matching one that "a"
> Perl interpreter (be it ActivePerl or the system standard shipped with
> your distribution) looks for, it will use it.
> 
> Your statement that the version of Perl being used depends on which one
> comes first in the path might be true on Windows; on Unix, it will only
> be true for when you type "perl" without a path in an interactive shell,
> or for when call it from within, say, a bash script without preceding it
> with a path.
> Once you chmod +x a Perl script and call it by its name, without
> prefacing the name and full path to the interpreter, the shebang line
> will be used to determine the interpreter.
> 
> So, if you need to set PERL5LIB for your ActivePerl installation, it
> should be unset (by adding a suitable if/then clause) when your .bashrc
> / .bash_profile are read and parsed by an X2Go task.
> It's kind of weird that, according to your other bug report, you have
> exactly 0 indication that you're running from within an X2Go session.
> I can see how that makes it difficult to script around it ;-) - but
> let's track that in the other bug report.
> 
> Kind Regards,
> Stefan Baur
> 
> Am 10.01.2017 um 23:48 schrieb Ted Toal:
>> I disagree.  Perl behavior is to look at env. var. PERL5LIB to find its library.  This should be set to match the Perl that is being invoked, which is normally done by placing that Perl’s bin directory on the path.  Since I did place it on the path, there are only two possibilities for why x2go ran /usr/bin/perl: either it hard-coded the path to Perl, in which case it should first set PERL5LIB (or maybe there is a Perl command line arg to specify the library folder), OR x2go ignored my changes to PATH when it ran perl (in which case it should also ignore PERL5LIB).
>> 
>> - Ted
>> 
>> 
>> 
>> 
>>> On Jan 10, 2017, at 2:35 PM, Stefan Baur <X2Go-ML-1@baur-itcs.de> wrote:
>>> 
>>> Control: close -1
>>> Control: tag -1 not-a-bug
>>> 
>>> Am 10.01.2017 um 22:15 schrieb Ted Toal:
>>>> Package: NXAGENT
>>>> Version: 3.5.0
>>>> 
>>>> My .bash_profile defines Perl environment variables for Active Perl, and adds the Active Perl bin directory to the start of the path. This causes an x2go session to fail with the message:
>>>> Connection failed. /usr/bin/perl: symbol lookup error: /share/carvajal-archive/PACKAGES/local/ActivePerl-5.24/lib/auto/Sys/Hostname/Hostname.so: undefined symbol: Perl_xs_handshake
>>>> NXAGENT is user /usr/bin/perl and ignoring the Perl bin directory at the start of the path, but it is nevertheless using the Perl environment variables and so is looking in the wrong place for the Perl library.
>>> 
>>> I'd say this isn't a bug, but actually expected behavior.
>>> If you need different values for variables depending on which software
>>> you run, you either need to prefix them manually each time you call that
>>> software, or write a wrapper script, or use if/then clauses in your
>>> .bash_profile.  The latter is what you seem to have decided to do, and
>>> ran into problems with, judging from your bug report #1134, thus closing
>>> this one.
>>> 
>>> -Stefan
>>> 
>>> 
>>> -- 
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>>> 
>> 
> 
> 
> -- 
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