LibreOffice On-Line WebSocket server
====================================
Dependencies
------------
LibreOffice On-Line WebSocket server has the following dependencies:
* libpng
* Poco library: http://pocoproject.org/index.html.
* libcap-progs
Poco can be built with ./configure --prefix=/opt/poco && make install, but
distro packages exist too.
On openSUSE, you can use:
zypper ar http://download.opensuse.org/repositories/devel:/libraries:/c_c++/openSUSE_13.2/devel:libraries:c_c++.repo
zypper in poco-devel libcap-progs
Building
--------
loolwsd uses autoconf/automake, so build using the usual:
autoreconf
automake --add-missing
./configure --enable-silent-rules --with-lokit-path=<MASTER>/include
make
where <MASTER> is the location of the LibreOffice source tree.
Note that the loolwsd program needs the CAP_SYS_CHROOT capability,
thus you will be asked the root password when running make as it
invokes sudo to run /sbin/setcap.
If you have self-built Poco, add the following to ./configure:
--with-poco-includes=<POCOINST>/include --with-poco-libs=<POCOINST>/lib
where <POCOINST> means the Poco installation location.
If you have the Poco debugging libraries (eg. you have a self-built
Poco), you can add --enable-debug to the configure options for
additional debugging.
For Windows, a proper VS2013 project is needed.
There is still unconditional debugging output etc. This is a work in
progress.
Running
-------
Now you need to set up a minimal chroot system, and directory for the jails:
./setup-sys-chroot <SYSTEMPLATE> <MASTER>/instdir
mkdir <ROOTFORJAILS>
To run loolwsd the way it is supposed to eventually be run "for real", you can
now do:
./loolwsd --systemplate=<SYSTEMPLATE> --lotemplate=<MASTER>/instdir --childroot=<ROOTFORJAILS>
and connect loleaflet to that (see loleaflet/README for more info).
Again, <MASTER> is location of the LibreOffice source tree with a built
LibreOffice. This is work in progress, and consequently needs the latest
LibreOffice master.
The <SYSTEMPLATE> is a directory tree set up using the
setup-sys-chroot script here. It is intended to contain the runtime
environment needed by the LibreOffice dynamic libraries used through
LibreOfficeKit. Improvements to that script are very likely needed on
various distros.
The <ROOTFORJAILS> directory above is a presumably initially empty
directory under which loolwsd will create chroot jails for editing
each specific document.
As loolwsd uses hardlinks to "copy" the contents of both <SYSTEMPLATE>
and the <MASTER>/instdir directories into each chroot jail,
<SYSTEMPLATE> and <ROOTFORJAILS> need to be on the same file system as
<MASTER>/instdir.
If you plan to hack on loolwsd, you probably want to familiarize
yourself with loolwsd's --test and --numprespawns switches, and the
'connect' test program.
For interactive testing, you can use the loolwsd --test switch, or you
can use the 'connect' program. Both accept "commands" from the
protocol on standard input. You can either used them tuly
interactively, or edit input lines into a file, or use shell
scripting, etc. For instance:
(echo load /some/where/foo.odt; echo tile width=500 height=500 tileposx=0 tileposy=0 tilewidth=10000 tileheight=10000; sleep 10) |
./loolwsd --test --systemplate=/home/tml/lo/master/lool-sys-template --lotemplate=/home/tml/lo/master/instdir --childroot=/home/tml/lo/master/lool-child-root
Debugging
---------
When debugging, you want to add --numprespawns=1 to the loolwsd parameters to
limit the amount of concurrently running processes.
When the crash happens too early, you also want to
export SLEEPFORDEBUGGER=<number of seconds>
so that you have time to attach to the process.
Then run loolwsd, and attach your debugger to the process you are interested
in.
Protocol description
--------------------
See protocol.txt for a description of the protocol to be used over the
websocket.
