Update: As of Gitorious 3.2 (beginning of 2015) gitorious supports ubuntu directly. See https://gitorious.org/gitorious/ce-installer/ for installation instructions.

Original instructions:

To install gitorious the latest one from git, follow these steps

First, lets go root by using

sudo su

[sudo] password for <username>:

Installing packages

When installing all these packages, you will be asked for a MySQL root password, which you should remember, because you will need it later on.

  aptitude install 

    build-essential zlib1g-dev tcl-dev libexpat-dev libxslt1-dev 

    libcurl4-openssl-dev postfix apache2 mysql-server mysql-client 

    apg geoip-bin libgeoip1 libgeoip-dev sqlite3 libsqlite3-dev 

    imagemagick libpcre3 libpcre3-dev zlib1g zlib1g-dev libyaml-dev 

    libmysqlclient15-dev apache2-dev libonig-dev ruby-dev rubygems 

    libopenssl-ruby libdbd-mysql-ruby libmysql-ruby 

    libmagick++-dev zip unzip memcached git-core git-svn git-doc 

    git-cvs irb

Installing the Ruby Gems

Gem.source_index is being deprecated. Using system 1.8.25 avoids the source_index error.

REALLY_GEM_UPDATE_SYSTEM=1 gem update --system 1.8.25

Now we can install all the necessary gems:

  gem install --no-ri --no-rdoc -v 0.8.7 rake && 

    gem install --no-ri --no-rdoc -v 1.1.0 daemons && 

    gem install -b --no-ri --no-rdoc 

        rmagick stompserver passenger bundler

Installing the Sphinx Search Server

wget http://sphinxsearch.com/files/sphinx-0.9.9.tar.gz && 

    tar -xzf sphinx-0.9.9.tar.gz && 

    cd sphinx-0.9.9 && 

    ./configure --prefix=/usr && 

    make all install

Getting Gitorious

  git clone git://gitorious.org/gitorious/mainline.git /var/www/gitorious && 

    cd /var/www/gitorious && 

    git submodule init && 

    git submodule update

Easy as pie. Now we just need to put the Gitorious binary on our path:

 ln -s /var/www/gitorious/script/gitorious /usr/bin

Configuring services

Gitorious needs a bunch of background services, so we need to copy the supplied startup scripts:

cd /var/www/gitorious/doc/templates/ubuntu/ && 

    cp git-daemon git-poller git-ultrasphinx stomp /etc/init.d/ && 

    cd /etc/init.d/ && 

    chmod 755 git-daemon git-poller git-ultrasphinx stomp

and enable them:

 update-rc.d git-daemon defaults && 

    update-rc.d git-poller defaults && 

    update-rc.d git-ultrasphinx defaults && 

    update-rc.d stomp defaults

We need to create an additional symlink, because all the startup scripts have RUBY_HOME set to /opt/ruby-enterprise (alternatively we could just patch the files, but this way it is easier and you can update the scripts if needed):

 ln -s /usr/ /opt/ruby-enterprise

Fixing git-ultrasphinx

As of March 2013 the git-ultrasphinx script is broken and will fail to start. Please edit /etc/init.d/git-ultrasphinx and check that the start, stop and restart commands are as follows (replace ultrasphinx:daemon with ts if necessary):

 START_CMD="cd $GITORIOUS_HOME && rake ts:start RAILS_ENV=production"

 STOP_CMD="cd $GITORIOUS_HOME && rake ts:stop RAILS_ENV=production"

 RESTART_CMD="cd $GITORIOUS_HOME && rake ts:restart RAILS_ENV=production"

Configuring Apache

Passenger

First of all, we need to compile the Apache2 passenger module:

$(gem contents passenger | grep passenger-install-apache2-module)

The passenger configuration script will tell you exactly what you’ll need to add to your apache configuration. The part you need to copy looks like this:

Please edit your Apache configuration file, and add these lines:

   LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-3.0.9/ext/apache2/mod_passenger.so

    PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-3.0.9

    PassengerRuby /usr/bin/ruby1.8

After you restart Apache, you are ready to deploy any number of Ruby on Rails
applications on Apache, without any further Ruby on Rails-specific
configuration!
These three lines need to be inserted into

/etc/apache2/mods-available/passenger.load

Enabling necessary modules

   a2enmod passenger && 

        a2enmod rewrite && 

        a2enmod ssl

Creating the Apache2 sites

Type in :

nano /etc/apache2/sites-available/gitorious

And copy paste the following text

<VirtualHost *:80>

    ServerName your.server.com

    DocumentRoot /var/www/gitorious/public

</VirtualHost>

Type in

 nano /etc/apache2/sites-available/gitorious-ssl 

And copy paste the following text

<IfModule mod_ssl.c>

    <VirtualHost _default_:443>

        DocumentRoot /var/www/gitorious/public

        SSLEngine on

        SSLCertificateFile    /etc/ssl/certs/ssl-cert-snakeoil.pem

        SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key

        BrowserMatch ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0

    </VirtualHost>

</IfModule>

Now we need to disable the default site, and enable our freshly created Gitorious sites:

  a2dissite default && 

    a2dissite default-ssl && 

    a2ensite gitorious && 

    a2ensite gitorious-ssl

Creating a MySQL user for gitorious

  mysql -u root -p

Enter the password you made while installing MySQL after the following prompt

Enter password:

Type this in line by line excluding the mysql> and changing <insert password> with your MySQL password you made while installing MySQL

 mysql> GRANT ALL PRIVILEGES ON *.* TO 'gitorious'@'localhost' IDENTIFIED BY '<insert password>' WITH GRANT OPTION;



mysql> FLUSH PRIVILEGES;

Configuring Gitorious

First of all, we need to make sure we have all gems in the correct version for Gitorious, so we run the following:

cd /var/www/gitorious/ && 

    bundle install && 

    bundle pack

Now we can create the user under which Gitorious will run and serve the Git repositories:

  adduser --system --home /var/www/gitorious/ --no-create-home --group --shell /bin/bash git && 

    chown -R git:git /var/www/gitorious

Then we need to create some stuff that Gitorious needs to run:

  su - git && 

    mkdir .ssh && 

    touch .ssh/authorized_keys && 

    chmod 700 .ssh && 

    chmod 600 .ssh/authorized_keys && 

    mkdir tmp/pids && 

    mkdir repositories && 

    mkdir tarballs

Creating the Gitorious configuration

Lets copy the sample configuration files to the correct path:

 cp config/database.sample.yml config/database.yml && 

    cp config/gitorious.sample.yml config/gitorious.yml && 

    cp config/broker.yml.example config/broker.yml

Now edit the config/database.yml and make sure you set the correct username and password in the production section. After that, we need to set a couple of things in config/gitorious.yml:

Make sure you are configuring the right section (not test:, but production:)

repository_base_path should be /var/www/gitorious/repositories

cookie_secret needs to be set to a random value >= 30 characters

gitorious_client_port should be 80

gitorious_host needs to be the exact hostname that clients will use (cookies get messed up otherwise)

archive_cache_dir should be /var/www/gitorious/tarballs

archive_work_dir should be something like /tmp/tarballs-work

hide_http_clone_urls should be true (they require extra unknown setup to work)

is_gitorious_dot_org should be false

Creating the Gitorious database

Because of an incompatibility of RubyGems with Rails < 2.3.11 you need to add the following line at the top of config/boot.rb:

require 'thread'

Now we let rake do all the work for us:

export RAILS_ENV=production && 

    bundle exec rake db:create && 

    bundle exec rake db:migrate && 

    bundle exec rake rake ts:conf && 

    bundle exec rake rake ts:rebuild

Create the Sphinx Cronjob

crontab -e 10 * * * * /var/www/gitorious/bin/rake ts:rebuild >/dev/null RAILS_ENV=production

Create an admin user

env RAILS_ENV=production ruby1.8 script/create_admin

Reboot

You’re finally done. Reboot your Ubuntu machine, and your Gitorious installation should be up and running.

Checking possible problems

Browse http://your.server.com/admin/diagnostics in order to check for possible problems.

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Source: http://coding-journal.com/installing-gitorious-on-ubuntu-11-04/