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<?xml version="1.0" encoding="UTF-8"?>
<section id="rootfs_ipkg_class" xreflabel="rootfs_ipkg class">
<title>rootfs_ipkg class</title>
<para>The <emphasis>rootf_ipk</emphasis> class us used to create a root
filesystem for the target device from a set of .ipkg packages. The end
result is a directory containing all the files that need to be included in
the root filesystem of the target device.</para>
<para>This class is normally not used directly, but instead used from the
<xref linkend="image_class" /> which creates images from a set of package
(typically <command>.ipkg</command>) files.</para>
<para>Summary of actions performed by the <emphasis>rootfs_ipkg</emphasis>
class:</para>
<orderedlist>
<listitem>
<para>Erase any existing root filesystem image by deleting the entire
contents of <command>${IMAGE_ROOTFS}</command>;</para>
</listitem>
<listitem>
<para>Creates the device node directory,
<command>${IMAGE_ROOTFS}/dev</command>;</para>
</listitem>
<listitem>
<para>Determines which packages to install in order to provide the
locales that have been requested;</para>
</listitem>
<listitem>
<para>Configures ipkg to allow it to be used locally to install into the
root filesystem <command>${IMAGE_ROOTFS}</command>;</para>
</listitem>
<listitem>
<para>Installs locale related .ipkg packages;</para>
</listitem>
<listitem>
<para>Installs the list of requested <command>.ipkg</command> packages,
<command>${IPKG_INSTALL}</command>;</para>
</listitem>
<listitem>
<para>Creates ipkg's arch.conf as
<command>${IMAGE_ROOTFS}/etc/ipkg/arch.conf</command>;</para>
</listitem>
<listitem>
<para>Runs any preinst and postinst scripts that were specified by the
installed .ipkg packages;</para>
</listitem>
<listitem>
<para>Creates the system configuration directory
<command>${IMAGE_ROOTFS}/${sysconfdir}</command> (that is the
<command>/etc</command> directory on the target);</para>
</listitem>
<listitem>
<para>Runs and custom post-processing commands, as described by
<command>${ROOTFS_POSTPROCESS_COMMAND}</command>;</para>
</listitem>
<listitem>
<para>Verifies that all the ipkg's were installed correctly and reports
an error if they were not;</para>
</listitem>
<listitem>
<para>Makes available a set of functions which may be used by callers of
the class: <command>zap_root_password</command>,
<command>create_etc_timestamp</command> and
<command>remove_init_link</command>;</para>
</listitem>
<listitem>
<para>Adds the rootfs task to run after the <emphasis>install</emphasis>
task <command>"addtask rootfs before do_build and
do_install"</command>.</para>
</listitem>
</orderedlist>
<para>The following variables may be used to control some of the behaviour
of this class:</para>
<variablelist>
<varlistentry>
<term>IPKG_INSTALL</term>
<listitem>
<para>The list of packages which will be installed into the root
filesystem. This needs to be set in order for this class to perform
any useful work.</para>
<para>Default: empty</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ROOTFS_POSTPROCESS_COMMAND</term>
<listitem>
<para>Defines additional commands to run after processing of the root
filesystem. Could be used to change roots password, remove parts of
the install kernel such as the <command>zImage</command> kernel image
or to edit the ipkg configuration for example.</para>
<para>Default: empty</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PACKAGE_ARCH</term>
<listitem>
<para>Defines the list of architectures that are support by the target
platform. This is used to configure the arch settings for ipkg on the
target system.</para>
<para>Default: <command>"all any noarch ${TARGET_ARCH}
${PACKAGE_EXTRA_ARCHS} ${MACHINE}"</command></para>
</listitem>
</varlistentry>
<varlistentry>
<term>IMAGE_LINGUAS</term>
<listitem>
<para>Specifies which locales should be installed. This is often set
to <command>""</command> to indicate that no locales will be
installed.</para>
<para>Default: <command>"de-de fr-fr en-gb"</command></para>
</listitem>
</varlistentry>
<varlistentry>
<term>EXTRA_IMAGEDEPENDS</term>
<listitem>
<para>A list of dependencies, this is appended to
<command>DEPENDS</command>. This is typically used to ensure that any
commands that are called by
<command>ROOTFS_POSTPROCESS_COMMAND</command> are actually built by
the system prior to being called.</para>
<para>Default: empty</para>
</listitem>
</varlistentry>
<varlistentry>
<term>BUILDNAME</term>
<listitem>
<para>The name of the build. This is either set by the distro
configuration (for released versions) or set to a date stamp which is
autogenerated by bitbake.</para>
<para>Default: <command>'date +%Y%m%d%H%M'</command></para>
</listitem>
</varlistentry>
<varlistentry>
<term>IMAGE_ROOTFS</term>
<listitem>
<para>The path to the root of the filesystem image. You can use this
when you need to explicitly refer to the root filesystem
directory.</para>
<para>Default: <command>IMAGE_ROOTFS =
"${TMPDIR}/rootfs"</command></para>
</listitem>
</varlistentry>
<varlistentry>
<term>DEPLOY_DIR</term>
<listitem>
<para>The base deploy dir. Used to find the directory containing the
ipkg files.</para>
<para>Default: <command>DEPLOY_DIR =
"${TMPDIR}/deploy"</command></para>
</listitem>
</varlistentry>
<varlistentry>
<term>DEPLOY_DIR_IPK</term>
<listitem>
<para>The directory in which to search for the ipkg files that are to
be installed in the root filesystem.</para>
<para>Default: <command>DEPLOY_DIR_IPK =
"${DEPLOY_DIR}/ipk"</command></para>
</listitem>
</varlistentry>
</variablelist>
<para>Note that the entire process is run under the control of <xref
linkend="fakeroot" /> in order to handle device files, uids and gids. The
<command>ROOTFS_POSTPROCESS_COMMAND</command> is useful due to the fact that
it runs within the same <xref linkend="fakeroot" /> instance as the rest of
this class.</para>
<para>The class also provides a function <command>real_do_rootfs</command>
which is executed without <xref linkend="fakeroot" /> and therefore can be
used from other classes, such as <xref linkend="image_class" />, that
are already running under the control of <xref linkend="fakeroot" />.</para>
</section>
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