un-installing perl core modules inside a freebsd jail

gideondsouza has asked for the wisdom of the Perl Monks concerning the following question:

So, just say I'm running some unknown perl scripts inside a freebsd jail.This jail is just a virtual freebsd system within the main system. I have a perl installation here.

Is there a way I can remove LWP::* or HTTP:: modules from the perl installation? So that any script writing programs to use these will break?

Can I do: $ pm-uninstall LWP::Simple, are there any consequences I'm not foreseeing?

It seems codepad does this, try running this script : http://codepad.org/DzB0uCf9, if I'm wrong, what is it doing?

Comment on un-installing perl core modules inside a freebsd jail

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Re: un-installing perl core modules inside a freebsd jail by tmharish (Friar) on Feb 20, 2013 at 10:09 UTC
Pull out the contents of your `@INC` and manually move the .pm for each of the modules that you do not want used on that system to a different location. If your the freeBSD virtual system does not boot then you can use the main system to restore whatever is needed.	[reply] [d/l]
Re^2: un-installing perl core modules inside a freebsd jail by gideondsouza (Pilgrim) on Feb 20, 2013 at 10:15 UTC
So you're saying a plain directory removal will work without breaking anything else. I mean perl itself won't stop running or anything, just that module will vanish?	[reply]
Re^3: un-installing perl core modules inside a freebsd jail by shmem (Chancellor) on Feb 20, 2013 at 10:23 UTC
I mean perl itself won't stop running or anything, just that module will vanish? Yes. Perl code which tries to load a vanished module will fail with the usual `Can't locate Vanished/Module.pm in @INC (@INC contains: ... ) BEGIN failed--compilation aborted.` [download] which means that perl is working fine :)	[reply] [d/l]
Re^3: un-installing perl core modules inside a freebsd jail by tmharish (Friar) on Feb 20, 2013 at 10:24 UTC
Well there are a bunch of modules that can access the net ( if thats what you are trying to block ) and this thread has some ways to find all modules installed. Regarding Perl breaking - I cannot think of any core module that allows for access to the internet ( and so removal of that will break the system ); Since I am not a 100% sure, you should, like I said earlier, keep them in a different location just so you can put them back if your OS were to break - you can do that from the main system.	[reply]
Re^4: un-installing perl core modules inside a freebsd jail by Anonymous Monk on Feb 20, 2013 at 16:01 UTC
Re^5: un-installing perl core modules inside a freebsd jail by talexb (Chancellor) on Feb 21, 2013 at 00:51 UTC
Re^5: un-installing perl core modules inside a freebsd jail by gideondsouza (Pilgrim) on Feb 21, 2013 at 09:01 UTC
Re: un-installing perl core modules inside a freebsd jail by Anonymous Monk on Feb 20, 2013 at 10:02 UTC
LWP isn't a core module, the end :)	[reply]
Re^2: un-installing perl core modules inside a freebsd jail by gideondsouza (Pilgrim) on Feb 20, 2013 at 10:14 UTC
ah! This means, I can just uninstall LWP and there won't be any perl scripts that can call the internet, or are there other net api's too? (That can make get/post requests)	[reply]
Re^3: un-installing perl core modules inside a freebsd jail by Anonymous Monk on Feb 21, 2013 at 08:23 UTC
Um, IO::Socket/Socket are core, as is the function socket	[reply]


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