[K12OSN] Fl_TeacherTool 0.30 issue (long)

Eric Harrison eharrison at mail.mesd.k12.or.us
Fri Jan 20 17:13:26 UTC 2006

Petre Scheie wrote:
> I'm not sure of the difference between the two libraries, but isn't the
> point of Mue Kow to get away from having custom files and instead rely
> on the libraries and other files that come with the distro?

That is definately one of the key points of Mue Kow. But note that
K12LTSP does not currently use a "Mue Kow" implementation of LTSP
(Edubuntu is the first and currently only "Mue Kow" implementation).

 > Why is the
> library in /opt/ltsp/i386/lib different than the one in /usr/lib?

The idea behind "classic" LTSP is to isolate the LTSP bits from the host
operating system bits. /usr/lib/ and /opt/ltsp/i386/lib/ are different,
and very likely incompatible, by _design_. (same goes for /bin/ and
/opt/ltsp/i386/bin/, etc)

"classic" LTSP has its own build environment (LBE) that can be used to
compile binaries that are compatible with LTSP.


> Robert Arkiletian wrote:
>> I have pretty much finished a new version of TT. I have added the
>> requested monitor/control feature using the vnc.so module that plugs
>> into X on the client. So now we can not only broadcast but also
>> monitor students activity or tutor them controlling their keyboard and
>> mouse. I have done minimal testing and it seems to work fine. BTW one
>> nice feature is that the broadcasting is unaffected by this new
>> feature because the broadcast uses tightvncviewer not realvncviewer.
>> Here is the issue. It requires modifiying LTSP. The how-to on the ltsp
>> wiki here
>> http://wiki.ltsp.org/twiki/bin/view/Ltsp/WorkInProgress#VNC_SO
>> describes the procedure and I have also pasted a summary how-to of it
>> from Trond Maehlum  below.
>> However, Eric Harrison and I are concerned about libgcc_s.so.1 which is
>> being overwritten in /opt/ltsp/i382/lib with the one from /usr/lib in
>> K12LTSP. These two libraries are *not* the same size. Unfortunately,
>> vnc.so does not work with the client X server with the stock
>> libgcc library. One thing to note is that vnc.so gets loaded at boot
>> time or (ctrl-alt-bkspc) not runtime. The only way I can *think* of
>> solving this is to build the vnc.so module inside a chrooted ltsp
>> tree. So it gets built with the ltsp stock libgcc. But I don't know if
>> this is even possible or how to do it. Wondering if anyone has any
>> ideas how to solve this problem? I know that a sym link approach was
>> used to address this issue in the wiki but I don't think it's a real
>> solution (But I could be wrong).
>> Here is a summary how-to from Trond Maehlum
>> +++++++++++++++++++++++++++++++++++++++++++++
>> Login at the terminalserver as root. Edit /opt/ltsp/i386/etc/lts.conf
>> and add:
>> X4_MODULE_02 = vnc
>> Then edit the file /opt/ltsp/i386/etc/build_x4_cfg
>>  and add the following under 'Secton "Screen"' (but over
>> 'EndSubSection'), so it looks
>> like this:
>>  Section "Screen"
>>        Identifier "Screen0"
>>        Device "My Video Card"
>>        Monitor "My Monitor"
>>        DefaultDepth  ${X_COLOR_DEPTH:-16}
>>        Subsection "Display"
>>                Depth ${X_COLOR_DEPTH:-16}
>>                Modes ${MODE[*]}
>>                Option "httpdir" "/usr/share/vnc/classes"
>>                Option "PasswordFile" "/root/.vnc/passwd"
>>                Option "rfbport" "5900"
>>                Option "usevnc"
>>        EndSubSection
>>  EndSection
>> Now you'll have to make a password for the vnc-session. Run this
>> command:
>> # /usr/bin/vncpasswd
>> Choose a password and copy the password file into the ltsp-tree
>> # cp -R -p /root/.vnc /opt/ltsp/i386/root/
>> Now you must copy the vnc-module and some libraries into the ltsp-tree:
>> # cp /usr/X11R6/lib/modules/extensions/vnc.so
>> /opt/ltsp/i386/usr/X11R6/lib/modules/extensions/
>> # cp /usr/lib/libstdc++.so.6 /opt/ltsp/i386/usr/lib/
>> Before you do this next cp. Backup /opt/ltsp/i386/lib/libgcc_s.so.1 as
>> libgcc_s.so.1.backup
>> so you don't lose the original file.
>> # cp /lib/libgcc_s.so.1 /opt/ltsp/i386/lib/
>> ++++++++++++++++++++++++++++++++++++++++++
>> --
>> Robert Arkiletian
>> C++ GUI tutorial http://fltk.org/links.php?V19
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