[FreeNX-kNX] Re: libXcompext.so.3 missing due to libpng12.so.0 issue

[Clive Eisen]

I have only been glancing at this thread...

can user nx actually read the libraries?

i.e. what are the perms?


On 27 Apr 2011, at 19:21, cognitive.libertarian+ml at gmail.com wrote:

> * chris at ccburton.com <chris at ccburton.com> [2011-04-23 13:47]:
> 
>>>  $ cat > /usr/X11R6/bin/nxagent-wrapper.sh <<EOF
>>> #!/bin/bash
>>> 
>>> export LD_LIBRARY_PATH="/usr/local/nx/nxcomp:
>>> /usr/local/nx/nxcompext:/usr/local/nx/nxcompshad:/usr/NX/lib"
>> 
>> OK,
>> but
>> you aren't adding it to your library path, you are overwriting . . 
> 
> One of the guides said it should be overwritten for some reason.
> LD_LIBRARY_PATH is empty anyway, so it should not make a difference.  
> 
>>>  $ ldd /usr/X11R6/bin/nxagent
>> 
>> This is without changing your
>>        LD_LIBRARY_PATH
>> for ldd
> 
> I tested it both ways.  That output is the same with or without the
> LD_LIBRARY_PATH (perhaps because I also added these to the cache using
> ldconfig).
> 
>> . . . . . . . . . . it finds one elsewhere,  (src)
>> cos
>> LD_LIBRARY_PATH hasn't been overwritten for ldd
> 
> That's a typo.  Sorry for the confusion.  All these packages are in
> /usr/local/src/nx on my system.  I removed the "src" from the example
> on how I got around one of the problems, figuring that it would be
> more consistent with what others would use.
> 
>>> so.3 (0xb7cd8000)
>>>        libXcompshad.so.3 => 
>>> /usr/local/src/nx/nxcompshad/libXcompshad.so.3 (0xb7ccb000)
>>>        ...
>>>        libpng12.so.0 => /usr/NX/lib/libpng12.so.0 (0xb7b10000)
>>>        ...
>>> 
>>> Notice the 3 libXcomp* libs are now found according to ldd,
>> 
>> . . . . . .  without the new LD_LIBRARY_PATH . . . . . 
>> 
>>> but
>>> nxagent reports "No such file or directory" for libXcompext.so.3.
>> 
>> . . . with the NEW LD_LIBRARY_PATH which doesn't look in 
>>        /usr/local/src/nx/nxcomp
> 
> Everything matches up.  This is why I'm at a loss for how to fix
> this.  LD_LIBRARY_PATH includes /usr/local/src/nx/nxcompext, and
> /usr/local/src/nx/nxcompext contains libXcompext.so.3.  
> 
>>> There appears to be a library conflict with libpng12.so.0.  Would
>>> that cause libXcompext.so.3 to go missing?
>> 
>> I can't see a conflict ???
> 
> This is at the top of the output from ldd:
> 
>  $ ldd /usr/X11R6/bin/nxagent
>  /usr/X11R6/bin/nxagent: /usr/NX/lib/libpng12.so.0: no version information available (required by /usr/local/src/nx/nxcomp/libXcomp.so.3)
>  /usr/X11R6/bin/nxagent: /usr/NX/lib/libpng12.so.0: no version information available (required by /usr/local/src/nx/nxcompext/libXcompext.so.3)
> 
> When running "ldconfig -p | grep png":
> 
>        libpng12.so.0 (libc6) => /usr/NX/lib/libpng12.so.0
>        libpng12.so.0 (libc6) => /usr/lib/libpng12.so.0
>        libpng12.so   (libc6) => /usr/NX/lib/libpng12.so
>        libpng12.so   (libc6) => /usr/lib/libpng12.so
> 
> So there are two versions in play.  I'm not sure how to go about
> resolving this.
> 
>> Compile/install all the SERVER stuff, don't use the client libraries.
> 
> The guides out there are a bit tangled.  They don't name the server
> and client packages.  Is nxagent a server or client?
> 
>> #!/bin/sh
>> 
>> NXCOMMAND=$(basename $0)
>> 
>> export LD_LIBRARY_PATH=/usr/lib/NX/lib${LD_LIBRARY_PATH+:$LD_LIBRARY_PATH}
>> exec /usr/lib/NX/$NXCOMMAND ${1+"$@"}
>> 
>> 
>> Should fix it.
>> 
>> I do hope you are enjoying all this . . . ;)
> 
> Thanks for the help.  However, that wrapper only makes slight changes,
> and it does not turn out to make a difference.  I still get:
> 
> /usr/X11R6/bin/nxagent: error while loading shared libraries: libXcompext.so.3: cannot open shared object file: No such file or directory
> 
> Even though LD_LIBRARY_PATH includes /usr/local/src/nx/nxcompext/.
> The only other explanation would be if nxagent ignores
> LD_LIBRARY_PATH, and also ignores the cache, and just looks in a fixed
> location.  
> 
> In the madness of trying fix this extremely frustrating problem, I've
> copied/linked libXcompext.so.3 to three areas:
> 
>  /usr/NX/lib/libXcompext.so.3
>  /usr/NX/lib/libXcompext.so.3.4.0
>  /usr/lib/libXcompext.so.3
>  /usr/lib/libXcompext.so.3.4.0
>  /usr/local/src/nx/nxcompext/libXcompext.so.3
>  /usr/local/src/nx/nxcompext/libXcompext.so.3.4.0
> 
> I've made sure all three locations are in the cache:
> 
>  $ ldconfig -p | grep pext
>        libXcompext.so.3 (libc6) => /usr/local/src/nx/nxcompext/libXcompext.so.3
>        libXcompext.so.3 (libc6) => /usr/NX/lib/libXcompext.so.3
>        libXcompext.so.3 (libc6) => /usr/lib/libXcompext.so.3
>        libXcompext.so 	 (libc6) => /usr/local/src/nx/nxcompext/libXcompext.so
>        libXcompext.so 	 (libc6) => /usr/NX/lib/libXcompext.so
>        libXcompext.so 	 (libc6) => /usr/lib/libXcompext.so
> 
> I've gone as far as to add all three locations to LD_LIBRARY_PATH:
> 
>  export LD_LIBRARY_PATH="/usr/local/src/nx/nxcomp:/usr/local/src/nx/nxcompext:/usr/local/src/nx/nxcompshad:/usr/NX/lib:/usr/lib/"
> 
> I'm at a wall.
> 
> Any other ideas?
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