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* Document the X.org generator.

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svn path=/nixpkgs/trunk/; revision=15189
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Eelco Dolstra 2009-04-20 16:00:40 +00:00
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doc/package-notes.xml
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@ -165,12 +165,60 @@ splashutils_15 = ...;</programlisting>
<!--============================================================-->
<section>
<title>X.org</title>
<para>* Expression is auto-generated</para>
<para>* How to update</para>
<title>X.org</title>
<para>The Nix expressions for the X.org packages reside in
<filename>pkgs/servers/x11/xorg/default.nix</filename>. This file is
automatically generated from lists of tarballs in an X.org
release. As such it should not be modified directly; rather, you
should modify the lists or the generator script.</para>
<para>The generator is invoked as follows:
<screen>
$ cd pkgs/servers/x11/xorg
$ cat tarballs-7.4.list extra.list old.list \
| perl ./generate-expr-from-tarballs.pl
</screen>
For each of the tarballs in the <filename>.list</filename> files, the
script downloads it, unpacks it, and searches its
<filename>configure.ac</filename> and <filename>*.pc.in</filename>
files for dependencies. This information is used to generate
<filename>default.nix</filename>. The generator caches downloaded
tarballs between runs. Pay close attention to the <literal>NOT FOUND:
<replaceable>name</replaceable></literal> messages at the end of the
run, since they may indicate missing dependencies. (Some might be
optional dependencies, however.)</para>
<para>A file like <filename>tarballs-7.4.list</filename> contains all
tarballs in a X.org release. It can be generated like this:
<screen>
$ export i="mirror://xorg/X11R7.4/src/everything/"
$ cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
| perl -e 'while (&lt;>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
| sort > tarballs-7.4.list
</screen>
<filename>extra.list</filename> contains libraries that aren’t part of
X.org proper, but are closely related to it, such as
<literal>libxcb</literal>. <filename>old.list</filename> contains
some packages that were removed from X.org, but are still needed by
some people or by other packages (such as
<varname>imake</varname>).</para>
<para>If the expression for a package requires derivation attributes
that the generator cannot figure out automatically (say,
<varname>patches</varname> or a <varname>postInstall</varname> hook),
you should modify the generator script
(<varname>generate-expr-from-tarballs.pl</varname>).</para>
</section>
<!--============================================================-->
<section>