<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xml:id="chap-installation">
<title>Installation</title>
<section>
<title>Prerequisites</title>
<para>
To install and use Hydra you need to have installed the following dependencies:
<itemizedlist>
<listitem><para>Nix</para></listitem>
<listitem><para>PostgreSQL</para></listitem>
</itemizedlist>
At the moment, Hydra runs only on 32 bit and 64 bit Linux (<emphasis>i686-linux</emphasis> and <emphasis>x86_64_linux</emphasis>).
</para>
</section>
<section>
<title>Installation</title>
<para>
Hydra can be installed by visiting the URL,
<screen>
http://hydra.nixos.org/view/hydra/unstable</screen>
and use the one-click install available at one of the build pages. You could also
install Hydra through the channel by performing the following commands:
<screen>
nix-channel --add http://hydra.nixos.org/jobset/hydra/trunk/channel/latest
nix-channel --update
nix-env -i hydra</screen>
</para>
</section>
<section>
<title>Creating database</title>
<para>
Hydra stores its results in a PostgreSQL database. To setup a database with <emphasis>hydra</emphasis> as database name and username, issue the following commands:
<screen>
createdb hydra
echo "CREATE USER hydra WITH PASSWORD '<your-password>' ;" | psql hydra
cat $prefix/share/hydra/sql/hydra-postgresql.sql | psql hydra
echo "GRANT ALL ON DATABASE hydra TO hydra;" | psql hydra</screen>
Note that <emphasis>$prefix</emphasis> is the location of Hydra in the nix store.
</para>
<para>
To add a user <emphasis>root</emphasis> with <emphasis>admin</emphasis> privileges, execute:
<screen>
echo "INSERT INTO Users(userName, emailAddress, password) VALUES ('root', 'some@email.adress.com', '$(echo -n foobar | sha1sum | cut -c1-40)');" | psql hydra
echo "INSERT INTO UserRoles(userName, role) values('root', 'admin');" | psql hydra</screen>
Hydra uses an environment variable to know which database should be used, and a variable which point to a location that holds some state. To set these
variables, add the following to the <emphasis>.profile</emphasis> of the user running the Hydra services.
<screen>
export HYDRA_DBI="dbi:Pg:dbname=hydra;host=localhost;"
export HYDRA_DATA=/var/lib/hydra</screen>
Make sure that the <emphasis>HYDRA_DATA</emphasis> directory exists and is writable for the user which will run the Hydra services.
</para>
</section>
<section>
<title>Getting started</title>
<para>
To start the Hydra webserver, execute:
<screen>
hydra_server.pl</screen>
When the server is started, you can browse to <ulink>http://localhost:3000/</ulink> to start configuring your Hydra instance.
</para>
</section>
<section>
<title>Example: PatchELF</title>
<para>
</para>
<subsection>
<title>Defining jobsets</title>
<para>
</para>
</subsection>
<subsection>
<title>Creating views</title>
<para>
</para>
</subsection>
</section>
</chapter>