# Setting up buildmaster

The build master is set up using virtualenv, so that buildbot needs not to be installed as root, and so that buildbot can't conflict with other installed python packages.
So, first, set up the virtualenv (in the directory virtualenv in this example):

	apt-get install python-dev python-virtualenv
	virtualenv --no-site-packages virtualenv
	echo 'source $HOME/virtualenv/bin/activate' >> ~/.profile
	source virtualenv/bin/activate

Then we check out buildbot sources, switch to the last stable release, and install into the virtual environment.

	git clone git://github.com/buildbot/buildbot.git
	cd buildbot/master
	git checkout v0.8.5
	python setup.py install

After this commands like `buildbot create-master` and `buildbot start` can be used to create/control the master.
After creating the master, the generated `public_html` can be erased and linked to the `buildbot/master/public_html` in the Spring repository.

# Setting up buildslave (Making the chroot)

At least debootstrap and schroot are required. I didn't compile an exhaustive list of other dependencies on the host system, so YMMV.

## Configuring schroot

Add a file (name does not matter) to `/etc/schroot/chroot.d` with the following contents, after substituting an absolute path for `$DIR`:

	[buildbot-maverick]
	description=Ubuntu Maverick
	directory=$DIR
	type=directory
	users=buildbot
	groups=buildbot
	root-groups=root
	personality=linux32
	script-config=script-defaults
	message-verbosity=verbose

Then, remove or comment out the `/home` bind mount in `/etc/schroot/default/fstab`!

This configuration has been tested with schroot 1.4.23. With any other version YMMV.

## Building and entering the chroot

	debootstrap --variant=buildd --arch i386 maverick $DIR http://ftp.cvut.cz/ubuntu/
	mkdir -p $DIR/home/buildbot/www
	chown buildbot:buildbot $DIR/home/buildbot
	schroot -c buildbot-maverick

# Inside the chroot

## Run (as root)

	echo 'deb http://ftp.cvut.cz/ubuntu maverick universe' >> /etc/apt/sources.list
	sed s/deb/deb-src/g /etc/apt/sources.list >> /etc/apt/sources.list
	apt-get update
	apt-get install nano git-core python-dev python-setuptools

	cd /root
	git clone git://github.com/buildbot/buildbot.git
	cd buildbot
	git checkout v0.8.3p1
	cd slave
	python setup.py install
	mkdir /slave
	chown buildbot:buildbot /slave

Build dependencies for Windows build (except MinGW, see below):

	apt-get install cmake nsis p7zip-full unzip wget pandoc
	apt-get install openjdk-6-jdk   #to enable building of Java AIs

Build dependencies for Linux build:

	apt-get install libboost-all-dev libdevil-dev libfreetype6-dev libopenal-dev \
		libogg-dev libvorbis-dev libglew-dev libsdl-dev libxcursor-dev \
		cppcheck

## Recompile MinGW package with dwarf2 exceptions instead of sjlj exceptions (as root)

First recompile the compiler itself:

	mkdir mingw
	cd mingw
	apt-get build-dep gcc-mingw32
	apt-get source gcc-mingw32
	cd gcc-mingw32-4.4.4
	editor debian/rules   # remove --enable-sjlj-exceptions, add --disable-sjlj-exceptions --with-dwarf2
	dpkg-buildpackage -rfakeroot -b
	cd ..
	dpkg -i gcc-mingw32*.deb
	echo "gcc-mingw32 hold"|dpkg --set-selections

Then recompile the runtime libraries against the new compiler:

	apt-get build-dep mingw32-runtime
	apt-get source mingw32-runtime
	cd mingw32-runtime-3.15.2
	dpkg-buildpackage -rfakeroot -b
	cd ..
	dpkg -i mingw32-runtime*.deb
	echo "mingw32-runtime hold"|dpkg --set-selections

Optionally, remove build dependencies (check what apt-get build-dep installed!):

	apt-get purge autoconf automake autotools-dev cdbs debhelper fdupes gettext \
		gettext-base groff-base html2text intltool intltool-debian libcroco3 \
		libfont-afm-perl libgmp3-dev libgmpxx4ldbl libhtml-format-perl \
		libhtml-parser-perl libhtml-tagset-perl libhtml-tree-perl \
		libmail-sendmail-perl libmailtools-perl libmpfr-dev \
		libsys-hostname-long-perl libunistring0 liburi-perl libwww-perl \
		libxml-parser-perl lzma m4 man-db mingw-w64 po-debconf

## Patch a few things

We set up ld to allow only one execution at the same time, to prevent thrashing the box due to multiple parallel linker jobs.
We "patch" makensis to not sync the installer to disk after every tiny chunk of data it has written.
This speeds installer building up by an order of magnitude.

First, copy over ld, makensis and no-msync.c from spring/buildbot/slave (Spring repository) to the chroot.
Then switch to the directory (inside the chroot!) where you copied those files and do:

For Linux builds:

	mv /usr/bin/ld /usr/bin/ld.orig
	cp ld /usr/bin/ld

For MinGW builds:

	mv /usr/bin/i586-mingw32msvc-ld /usr/bin/i586-mingw32msvc-ld.orig
	cp ld /usr/bin/i586-mingw32msvc-ld
	mv /usr/i586-mingw32msvc/bin/ld /usr/i586-mingw32msvc/bin/ld.orig
	cp ld /usr/i586-mingw32msvc/bin/ld

For makensis:

	gcc -shared -m32 no-msync.c -o no-msync.so
	cp makensis no-msync.so /usr/local/bin/

## Run (as buildbot user)

Substitute MASTER with host:port of the buildmaster and SLAVENAME and PASSWORD with the slave name and password as configured in the master.

	buildslave create-slave /slave MASTER SLAVENAME PASSWORD
	cd /slave
	git clone git://github.com/spring/mingwlibs.git

## ccache

To install ccache simply run `apt-get install ccache` (inside the chroot) and (optionally) tweak the settings (cache size etc.)

# Outside the chroot again

Get the Makefile from the Spring repository that can be used to start/stop the slave easily:

	wget https://raw.github.com/spring/spring/master/buildbot/master/buildbot.mk -O Makefile

Then you can use:

	make start-slave    # creates schroot session and starts buildslave in it
	make stop-slave     # stops buildslave and remove schroot session
	make enter-chroot   # enter the schroot as buildbot user

Make sure you review the Makefile and fix the chroot name, paths, etc. before using it!
(That applies to anything in this readme really.)