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<?xml version="1.0"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
]>
<chapter xml:id="devel">
<title>Building, Packaging, and Contributing to p11-kit</title>
<section id="devel-links">
<title>Helpful Resources</title>
<para>Use the following to find more information about
contributing to p11-kit beyond what's in this manual:</para>
<itemizedlist>
<listitem><para><ulink url="http://p11-glue.freedesktop.org/p11-kit.html">Website</ulink></para></listitem>
<listitem><para><ulink url="mail:p11-glue@lists.freedesktop.org">Mailing list</ulink></para></listitem>
<listitem><para><ulink url="https://bugs.freedesktop.org/enter_bug.cgi?product=p11-glue&component=p11-kit">Bugzilla</ulink></para></listitem>
</itemizedlist>
</section>
<section id="devel-paths">
<title>Packaging PKCS#11 module configs</title>
<para>Developers or packagers of PKCS#11 modules need to install various
files into specific locations so that p11-kit will recognize and load the
module correctly.</para>
<para>You should use <literal>pkg-config</literal> as described below
to determine configuration paths. p11-kit installs a
<literal>pkg-config</literal> file called <literal>p11-kit-1.pc</literal>.
This file contains all the information about the various paths that p11-kit
looks for files at.</para>
<section id="devel-paths-config">
<title>Path to place module configuration</title>
<para>As described in the <link linkend="config-module">module configuration</link>
documentation, each PKCS#11 module should install a config file describing
that module. These config files should be installed to a specific directory which
can be determined by running:</para>
<programlisting>
$ <command>pkg-config p11-kit-1 --variable p11_module_configs</command>
/usr/share/p11-kit/modules</programlisting>
</section>
<section id="devel-paths-modules">
<title>Default path for modules with relative paths</title>
<para>If a <link linkend="config-module">module configuration</link>
contains a relative path in its <literal>module:</literal> setting,
then that module will be loaded from the default module path. This
path can be determined by running:</para>
<programlisting>
$ <command>pkg-config p11-kit-1 --variable p11_module_path</command>
/usr/lib64/pkcs11</programlisting>
</section>
</section>
<section id="devel-commands">
<title>Customizing installed commands</title>
<para>The <literal>p11-kit</literal> tool provides a
<literal>extract-trust</literal> command which extracts trust
policy information such as certificate anchors and so on
into files for use with libraries that cannot read this trust
information directly.</para>
<para>In order to be useful the <literal>extract-trust</literal>
command needs to be customized per distribution or site. You can
find this file in at <literal>tools/p11-kit-trust-extract.in</literal>
in the p11-kit source code.</para>
<para>The command is implemented as a simple script which
performs the various <literal>p11-kit extract</literal> commands
necessary to extract the information.</para>
<para>Using this script as a standard way to extract this
information allows for consistency between distributions and ease
of system administration.</para>
</section>
<section id="devel-building">
<title>Compiling p11-kit from Source</title>
<para>This describes how to compiling the p11-kit package from
source code. This is normally only necessary for those wishing to
contribute to the project or package p11-kit.</para>
<para>You can download
<ulink url="http://p11-glue.freedesktop.org/releases/">tarballs
of the releases</ulink> of p11-kit or
<ulink url="http://cgit.freedesktop.org/p11-glue/p11-kit/">check
out the source code from git</ulink>. This documentation will not
go into all the details of how to get your development environment
set up and instead focus on the what's unique to compiling p11-kit.</para>
<section id="devel-building-unix">
<title>Building on UNIX</title>
<para>p11-kit uses the standard GNU build system, using autoconf for package
configuration and resolving portability issues, automake for building makefiles
that comply with the GNU Coding Standards, and libtool for building shared
libraries on multiple platforms. The normal sequence for compiling and
installing the p11-kit library is thus:</para>
<programlisting>
$ ./configure --prefix=/path/to/prefix ...
$ make
$ make install
</programlisting>
<para>If you've checked out the source code from git, then the
<command>configure</command> script does not yet exist. So use
the following instead:</para>
<programlisting>
$ ./autogen.sh --prefix=/path/to/prefix ...
$ make
$ make install
</programlisting>
<para>The standard options provided by GNU autoconf may be passed to the configure
script. Please see the autoconf documentation or run <literal>./configure --help</literal>
for information about the standard options. In particular you probably want to adjust
the <literal>--prefix=/xxx</literal> argument depending on your system and development
environment.</para>
</section>
<section id="devel-building-dependencies">
<title>Optional Dependencies</title>
<para>On a modern GNU Linux system, p11-kit has no required dependencies other
than the standard C library. However on older UNIX systems, some of the following
may be required.</para>
<itemizedlist>
<listitem><para><command>gettext</command> is required if your system doesn't
have the <literal>gettext()</literal> functionality for handling message
translation databases. This can be provided by the libintl library from
the <ulink url="http://www.gnu.org/software/gettext">GNU gettext
package</ulink>.</para></listitem>
<listitem><para><command>pthread</command> is required if your (ancient) system
doesn't have this included in the base system. How this is provided is platform
specific.</para></listitem>
</itemizedlist>
<para>In addition p11-kit has several optional dependencies. If these are not available
during the build, then certain features will be disabled.</para>
<itemizedlist>
<listitem><para><command>gtk-doc</command> is required to build the reference
manual. Use <literal>--enable-doc</literal> to control this
dependency.</para></listitem>
<listitem><para><command>xsltproc</command> is required to build the command
manual pages. Use <literal>--enable-doc</literal> to control this
dependency.</para></listitem>
<listitem><para><command>libtasn1</command> is required to build the trust
module and code that interacts with certificates.</para></listitem>
</itemizedlist>
</section>
<section id="devel-building-configure">
<title>Extra Configuration Options</title>
<para>In addition to the normal options, the configure script in the p11-kit library
supports these additional arguments:</para>
<variablelist>
<varlistentry>
<term><option>--disable-trust-module</option></term>
<listitem><para>Disables building of the trust policy module.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--disable-debug</option>, <option>--enable-debug</option></term>
<listitem><para>By default p11-kit is built with debug symbols assertions and
and precondition checks. Enabling the debug option configures even more
detailed debug build, including disabling optimization. Disabling the debug
option is not recommended, as it disables all assertions, preconditions and
internal consistency checks, although it may result it a slightly faster
library.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--enable-doc</option></term>
<listitem><para>Enables building of the documentation and command line manual.
The documentation is built in the <literal>doc/html/</literal> directory of
the build. Requires the <literal>gtk-doc</literal> and <literal>xsltproc</literal>
dependencies.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--enable-strict</option></term>
<listitem><para>Enables strict checks during building of p11-kit. All
compiler warnings become errors.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--with-libtasn1</option>, <option>--without-libtasn1</option></term>
<listitem><para>Build with a dependency on the libtasn1 library. This dependency
allows the trust policy module to be built as well as other code that interacts with
certificates.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--with-module-path</option></term>
<listitem><para>Specify the path to look for PKCS#11 modules which were
listed in a module config file with a relative path.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--with-system-anchors</option></term>
<listitem><para>Specify the files or directories to look for system
certificate anchors. Multiple files and/or directories are specified with
a <literal>:</literal> in between them.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--with-system-certificates</option></term>
<listitem><para>Specify the files or directories to look for other
non-anchor system certificates. Multiple files and/or directories are
specified with a <literal>:</literal> in between them.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--with-system-config</option></term>
<listitem><para>Specify the path to look for p11-kit config files. This
usually defaults to something like <literal>/etc/pkcs11</literal></para></listitem>
</varlistentry>
</variablelist>
<para></para>
</section>
</section>
<section id="devel-building-style">
<title>Coding Style</title>
<para>We use a code style similar to the linux kernel. Use tabs
to indent and spaces to align/wrap beyond the indentation level.</para>
<para>We don't try to guarantee completely robust and problem free
behavior in cases where the caller or system isn't behaving. We
consider these to be outside of our control:</para>
<itemizedlist>
<listitem><para>Broken input from callers. We use preconditions
to check input and immediately return. We don't try to provide
error codes for all the various ways callers can screw
around.</para></listitem>
<listitem>
<para>Out of memory. It is pretty much impossible to handle out
of memory errors correctly. Handling them alongside other errors
is naive and broken. We don't try to guarantee library state
(such as locks or memory leaks) when memory allocation fails.</para>
<para>We do check the results from all memory allocations, but
treat them as unexpected conditions. As a nod to the behavior
of callers of this library, we don't abort on memory allocation
failures. We use preconditions with somewhat sane results.</para>
<para>Exception: when reading files or allocating potentially
unbounded amounts of memory, we should respond robustly to memory
allocation failures.</para>
</listitem>
</itemizedlist>
<para>These unexpected conditions indicate a bug either in p11-kit or
in the system. All bets are off once this occurs.</para>
<para>Use the <literal>return_val_xxx()</literal> precondition macros to
check for unexpected conditions.</para>
</section>
<section id="devel-testing">
<title>Testing and Code Coverage</title>
<para>As a general rule changes to p11-kit should have a tests exercising
that change. Use the <literal>make check</literal> command to run all
the tests. If you run it from a subdirectory only the tests in that
directory will be run.</para>
<para>Build p11-kit with the <option>--enable-coverage</option> configure
option to build code coverage support.</para>
<para>Once you've done that you can either use <literal>make coverage</literal>
to build code coverage information. Alternatively (and this is usually
easier) you can use
<ulink url="http://stef.thewalter.net/2012/12/git-coverage-useful-code-coverage.html">
<literal>git coverage</literal></ulink> to easily check whether
you've tested the lines changed by a patch.</para>
<para>A code coverage report is
<ulink url="http://p11-glue.freedesktop.org/build/coverage">available online</ulink></para>.
</section>
<section id="devel-debugging">
<title>Debugging Tips</title>
<para>Unexpected conditions will produce critical warnings by p11-kit.
These are often failed internal preconditions, and usually indicate a
bug either in p11-kit or the software calling it.</para>
<para>You can use the environment variable <literal>P11_KIT_STRICT=yes</literal>
to make p11-kit do an <literal>abort()</literal> (and core dump depending on
your configuration) when a critical warning occurs.</para>
</section>
</chapter>
|
