steam: added documentation to nixpkgs manual

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Marti Serra 2016-12-10 17:50:24 +01:00
parent adfcc2d953
commit 2698757095

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@ -382,4 +382,141 @@ it. Place the resulting <filename>package.nix</filename> file into
</section>
<section xml:id="sec-steam">
<title>Steam</title>
<section xml:id="sec-steam-nix">
<title>Steam in Nix</title>
<para>
Steam is distributed as a <filename>.deb</filename> file, for now only
as an i686 package (the amd64 package only has documentation).
When unpacked, it has a script called <filename>steam</filename> that
in ubuntu (their target distro) would go to <filename>/usr/bin
</filename>. When run for the first time, this script copies some
files to the user's home, which include another script that is the
ultimate responsible for launching the steam binary, which is also
in $HOME.
</para>
<para>
Nix problems and constraints:
<itemizedlist>
<listitem><para>We don't have <filename>/bin/bash</filename> and many
scripts point there. Similarly for <filename>/usr/bin/python</filename>
.</para></listitem>
<listitem><para>We don't have the dynamic loader in <filename>/lib
</filename>.</para></listitem>
<listitem><para>The <filename>steam.sh</filename> script in $HOME can
not be patched, as it is checked and rewritten by steam.</para></listitem>
<listitem><para>The steam binary cannot be patched, it's also checked.</para></listitem>
</itemizedlist>
</para>
<para>
The current approach to deploy Steam in NixOS is composing a FHS-compatible
chroot environment, as documented
<link xlink:href="http://sandervanderburg.blogspot.nl/2013/09/composing-fhs-compatible-chroot.html">here</link>.
This allows us to have binaries in the expected paths without disrupting the system,
and to avoid patching them.
</para>
</section>
<section xml:id="sec-steam-play">
<title>How to play</title>
<para>
For 64-bit systems it's important to have
<programlisting>hardware.opengl.driSupport32Bit = true;</programlisting>
in your <filename>/etc/nixos/configuration.nix</filename>. You'll also need
<programlisting>hardware.pulseaudio.support32Bit = true;</programlisting>
if you are using PulseAudio - this will enable 32bit ALSA apps integration.
To use the Steam controller, you need to add
<programlisting>services.udev.extraRules = ''
SUBSYSTEM=="usb", ATTRS{idVendor}=="28de", MODE="0666"
KERNEL=="uinput", MODE="0660", GROUP="users", OPTIONS+="static_node=uinput"
'';</programlisting>
to your configuration.
</para>
</section>
<section xml:id="sec-steam-troub">
<title>Troubleshooting</title>
<para>
<variablelist>
<varlistentry>
<term>Steam fails to start. What do I do?</term>
<listitem><para>Try to run
<programlisting>strace steam</programlisting>
to see what is causing steam to fail.</para></listitem>
</varlistentry>
<varlistentry>
<term>Game X fails to start</term>
<listitem><para>Games may fail to start because they lack
dependencies (this should be added to the script, for now),
or because they cannot be patched.The steps to launch a game
directly are:
<orderedlist>
<listitem><para>Patch the script/binary if you can.</para></listitem>
<listitem><para>Add a file named <filename>steam_appid.txt</filename> in
the binary folder, with the appid as contents (it can be found in the
stdout from steam).</para></listitem>
<listitem><para>Using the LD_LIBRARY_PATH from the nix/store steam script,
with some additions, launch the game binary:
<programlisting>LD_LIBRARY_PATH=~/.steam/bin32:$LD_LIBRARY_PATH:/nix/store/pfsa... blabla ...curl-7.29.0/lib:. ./Osmos.bin3
</programlisting> (if you could not patchelf the game, call ld.so directly
with the binary as param). With this technique, I can play many games
directly from steam. Others, like Team Fortress, cannot be patched
so I only managed to run them from the cmd line.
</para></listitem>
</orderedlist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Using the FOSS Radeon drivers</term>
<listitem><itemizedlist><listitem><para>
The open source radeon drivers need a newer libc++ than is provided
by the default runtime, which leads to a crash on launch. Use
<programlisting>environment.systemPackages = [(pkgs.steam.override { newStdcpp = true; })];</programlisting>
in your config if you get an error like
<programlisting>
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast</programlisting></para></listitem>
<listitem><para>
Steam ships statically linked with a version of libcrypto that
conflics with the one dynamically loaded by radeonsi_dri.so.
If you get the error
<programlisting>steam.sh: line 713: 7842 Segmentation fault (core dumped)</programlisting>
have a look at <link xlink:href="https://github.com/NixOS/nixpkgs/pull/20269">this pull request</link>.
</para></listitem>
</itemizedlist></listitem></varlistentry>
<varlistentry>
<term>Known issues</term>
<listitem><orderedlist>
<listitem><para>
No java in steam chrootenv. Games affected: Towns:
<programlisting>/home/foo/.local/share/Steam/SteamApps/common/towns/towns.sh: line 1: java: command not found</programlisting>
</para></listitem>
</orderedlist></listitem></varlistentry>
</variablelist>
</para>
</section>
</section>
</chapter>