108 lines
4.2 KiB
XML
108 lines
4.2 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|
xml:id="sec-language-ruby">
|
|
<title>Ruby</title>
|
|
|
|
<para>
|
|
There currently is support to bundle applications that are packaged as Ruby gems. The utility "bundix" allows you to write a <filename>Gemfile</filename>, let bundler create a <filename>Gemfile.lock</filename>, and then convert this into a nix expression that contains all Gem dependencies automatically.
|
|
</para>
|
|
|
|
<para>
|
|
For example, to package sensu, we did:
|
|
</para>
|
|
|
|
<screen>
|
|
<![CDATA[$ cd pkgs/servers/monitoring
|
|
$ mkdir sensu
|
|
$ cd sensu
|
|
$ cat > Gemfile
|
|
source 'https://rubygems.org'
|
|
gem 'sensu'
|
|
$ $(nix-build '<nixpkgs>' -A bundix --no-out-link)/bin/bundix --magic
|
|
$ cat > default.nix
|
|
{ lib, bundlerEnv, ruby }:
|
|
|
|
bundlerEnv rec {
|
|
name = "sensu-${version}";
|
|
|
|
version = (import gemset).sensu.version;
|
|
inherit ruby;
|
|
# expects Gemfile, Gemfile.lock and gemset.nix in the same directory
|
|
gemdir = ./.;
|
|
|
|
meta = with lib; {
|
|
description = "A monitoring framework that aims to be simple, malleable, and scalable";
|
|
homepage = "http://sensuapp.org/";
|
|
license = with licenses; mit;
|
|
maintainers = with maintainers; [ theuni ];
|
|
platforms = platforms.unix;
|
|
};
|
|
}]]>
|
|
</screen>
|
|
|
|
<para>
|
|
Please check in the <filename>Gemfile</filename>, <filename>Gemfile.lock</filename> and the <filename>gemset.nix</filename> so future updates can be run easily.
|
|
</para>
|
|
|
|
<para>
|
|
Updating Ruby packages can then be done like this:
|
|
</para>
|
|
|
|
<screen>
|
|
<![CDATA[$ cd pkgs/servers/monitoring/sensu
|
|
$ nix-shell -p bundler --run 'bundle lock --update'
|
|
$ nix-shell -p bundix --run 'bundix'
|
|
]]>
|
|
</screen>
|
|
|
|
<para>
|
|
For tools written in Ruby - i.e. where the desire is to install a package and then execute e.g. <command>rake</command> at the command line, there is an alternative builder called <literal>bundlerApp</literal>. Set up the <filename>gemset.nix</filename> the same way, and then, for example:
|
|
</para>
|
|
|
|
<screen>
|
|
<![CDATA[{ lib, bundlerApp }:
|
|
|
|
bundlerApp {
|
|
pname = "corundum";
|
|
gemdir = ./.;
|
|
exes = [ "corundum-skel" ];
|
|
|
|
meta = with lib; {
|
|
description = "Tool and libraries for maintaining Ruby gems.";
|
|
homepage = "https://github.com/nyarly/corundum";
|
|
license = licenses.mit;
|
|
maintainers = [ maintainers.nyarly ];
|
|
platforms = platforms.unix;
|
|
};
|
|
}]]>
|
|
</screen>
|
|
|
|
<para>
|
|
The chief advantage of <literal>bundlerApp</literal> over <literal>bundlerEnv</literal> is the executables introduced in the environment are precisely those selected in the <literal>exes</literal> list, as opposed to <literal>bundlerEnv</literal> which adds all the executables made available by gems in the gemset, which can mean e.g. <command>rspec</command> or <command>rake</command> in unpredictable versions available from various packages.
|
|
</para>
|
|
|
|
<para>
|
|
Resulting derivations for both builders also have two helpful attributes, <literal>env</literal> and <literal>wrappedRuby</literal>. The first one allows one to quickly drop into <command>nix-shell</command> with the specified environment present. E.g. <command>nix-shell -A sensu.env</command> would give you an environment with Ruby preset so it has all the libraries necessary for <literal>sensu</literal> in its paths. The second one can be used to make derivations from custom Ruby scripts which have <filename>Gemfile</filename>s with their dependencies specified. It is a derivation with <command>ruby</command> wrapped so it can find all the needed dependencies. For example, to make a derivation <literal>my-script</literal> for a <filename>my-script.rb</filename> (which should be placed in <filename>bin</filename>) you should run <command>bundix</command> as specified above and then use <literal>bundlerEnv</literal> like this:
|
|
</para>
|
|
|
|
<programlisting>
|
|
<![CDATA[let env = bundlerEnv {
|
|
name = "my-script-env";
|
|
|
|
inherit ruby;
|
|
gemfile = ./Gemfile;
|
|
lockfile = ./Gemfile.lock;
|
|
gemset = ./gemset.nix;
|
|
};
|
|
|
|
in stdenv.mkDerivation {
|
|
name = "my-script";
|
|
buildInputs = [ env.wrappedRuby ];
|
|
script = ./my-script.rb;
|
|
buildCommand = ''
|
|
install -D -m755 $script $out/bin/my-script
|
|
patchShebangs $out/bin/my-script
|
|
'';
|
|
}]]>
|
|
</programlisting>
|
|
</section>
|