Re: pkg/29700 (lang/sun-jre15 won't install using pkg_comp & libkver)

[Robert Elz <kre%munnari.OZ.AU@localhost>]

The following reply was made to PR pkg/29700; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: pkg/29700 (lang/sun-jre15 won't install using pkg_comp & libkver)
Date: Thu, 11 Feb 2010 12:07:07 +0700

     Date:        Thu, 11 Feb 2010 03:25:03 +0000 (UTC)
     From:        David Holland <dholland-pbugs%NetBSD.org@localhost>
     Message-ID:  <20100211032503.1E2F463B896%www.NetBSD.org@localhost>
 
   |  Is it doing LD_PRELOAD=... with a NetBSD library on a Linux bin? That
   |  would certainly explain why it would be failing.
 
 Yes, that is exactly what it is doing - pkg_comp uses libkver to
 get override uname() (and sysctl) so the system version appears to be
 some defined value.  To make that work, it simply does a LD_PRELOAD
 of the libkver library into absolutely everything that runs - obviously
 it has no idea whether what it is running is a NetBSD binary or a linux
 binary - it is simply a binary that is exec'd...
 
   |  Since the Linux emulation already has the ability to lie about the
   |  kernel version (since it has to pretend to be Linux) it should just
   |  not do this for Linux bins, I think... but figuring out where this
   |  happens and how to tell when it's happening probably isn't trivial.
 
 Yes...
 
   |  Anyway, do you know of another package (preferably, a simpler one)
   |  that exhibits the same behavior?
 
 I'll see if I can find one, but more or less by design, the linnx
 binaries that we run are all bloated complex things - if they weren't
 we'd just write our own version and ignore the binary only blob - so
 what we end up with is media players, browsers, and compilers.
 
 I don't suppose you'd consider acrobat "simple" ???
 
 If someone can send me a linux binary (I don't use linux myself, aside
 from what runs on NetBSD from pkgsrc) that will run with the suse libraries
 that are available in pkgsrc, then I'll test it, doing the test is easy
 enough given an available binary.   Something trivial like a version of
 cat (or perhaps better, a linux uname command) would be perfect.
 
   | Having no test case will just
   | guarantee that it sits around for another five years without anyone
   | doing anything. :-/
 
 Yes, I understand that problem!
 
   |  (but I agree, it should be reopened, or maybe we should file a new
   |  PR.)
 
 Could do that, if I can find something simpler - I also suspect that
 libkver can be made simple enough that it can be LD_PRELOAD'd into a
 linux binary without it doing any harm (which is probably exactly what
 it really needs to do there - nothing) while still doing what is
 expected for NetBSD binaries (90% of those the answer is the same,
 nothing, just occasionally does a binary check what version of the
 system it is running on).
 
 kre