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Diffstat (limited to 'third_party/nix/doc/manual/expressions/generic-builder.xml')
| -rw-r--r-- | third_party/nix/doc/manual/expressions/generic-builder.xml | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/third_party/nix/doc/manual/expressions/generic-builder.xml b/third_party/nix/doc/manual/expressions/generic-builder.xml deleted file mode 100644 index db7ff405d8..0000000000 --- a/third_party/nix/doc/manual/expressions/generic-builder.xml +++ /dev/null @@ -1,98 +0,0 @@ -<section xmlns="http://docbook.org/ns/docbook" - xmlns:xlink="http://www.w3.org/1999/xlink" - xmlns:xi="http://www.w3.org/2001/XInclude" - version="5.0" - xml:id='sec-generic-builder'> - -<title>Generic Builder Syntax</title> - -<para>Recall from <xref linkend='ex-hello-builder' /> that the builder -looked something like this: - -<programlisting> -PATH=$perl/bin:$PATH -tar xvfz $src -cd hello-* -./configure --prefix=$out -make -make install</programlisting> - -The builders for almost all Unix packages look like this — set up some -environment variables, unpack the sources, configure, build, and -install. For this reason the standard environment provides some Bash -functions that automate the build process. A builder using the -generic build facilities in shown in <xref linkend='ex-hello-builder2' -/>.</para> - -<example xml:id='ex-hello-builder2'><title>Build script using the generic -build functions</title> -<programlisting> -buildInputs="$perl" <co xml:id='ex-hello-builder2-co-1' /> - -source $stdenv/setup <co xml:id='ex-hello-builder2-co-2' /> - -genericBuild <co xml:id='ex-hello-builder2-co-3' /></programlisting> -</example> - -<calloutlist> - - <callout arearefs='ex-hello-builder2-co-1'> - - <para>The <envar>buildInputs</envar> variable tells - <filename>setup</filename> to use the indicated packages as - <quote>inputs</quote>. This means that if a package provides a - <filename>bin</filename> subdirectory, it's added to - <envar>PATH</envar>; if it has a <filename>include</filename> - subdirectory, it's added to GCC's header search path; and so - on.<footnote><para>How does it work? <filename>setup</filename> - tries to source the file - <filename><replaceable>pkg</replaceable>/nix-support/setup-hook</filename> - of all dependencies. These “setup hooks” can then set up whatever - environment variables they want; for instance, the setup hook for - Perl sets the <envar>PERL5LIB</envar> environment variable to - contain the <filename>lib/site_perl</filename> directories of all - inputs.</para></footnote> - </para> - - </callout> - - <callout arearefs='ex-hello-builder2-co-2'> - - <para>The function <function>genericBuild</function> is defined in - the file <literal>$stdenv/setup</literal>.</para> - - </callout> - - <callout arearefs='ex-hello-builder2-co-3'> - - <para>The final step calls the shell function - <function>genericBuild</function>, which performs the steps that - were done explicitly in <xref linkend='ex-hello-builder' />. The - generic builder is smart enough to figure out whether to unpack - the sources using <command>gzip</command>, - <command>bzip2</command>, etc. It can be customised in many ways; - see the Nixpkgs manual for details.</para> - - </callout> - -</calloutlist> - -<para>Discerning readers will note that the -<envar>buildInputs</envar> could just as well have been set in the Nix -expression, like this: - -<programlisting> - buildInputs = [ perl ];</programlisting> - -The <varname>perl</varname> attribute can then be removed, and the -builder becomes even shorter: - -<programlisting> -source $stdenv/setup -genericBuild</programlisting> - -In fact, <varname>mkDerivation</varname> provides a default builder -that looks exactly like that, so it is actually possible to omit the -builder for Hello entirely.</para> - -</section> |