Grammar, spelling fixed.

  };

}]]>

<para>The chief advantage of <literal>bundlerApp</literal> over <literal>bundlerEnv</literal> is the 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 unpredicable versions available from various packages.

<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>Resulting derivations for both builders also have two helpful items, <literal>env</literal> and <literal>wrapper</literal>. The first one allows one to quickly drop into

<para>Resulting derivations for both builders also have two helpful attributes, <literal>env</literal> and <literal>wrapper</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.