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Customizing a NanoBSD Image
This is probably the most important and most interesting feature of <application>NanoBSD</application>. This is also where you will be spending most of the time when developing with <application>NanoBSD</application>.
Invocation of the following command will force the <filename></filename> to read its configuration from <filename>myconf.nano</filename> located in the current directory:
<prompt>#</prompt> <userinput>sh -c myconf.nano</userinput>
Customization is done in two ways:
Configuration options
Custom functions
Configuration Options
With configuration settings, it is possible to configure options passed to both the <_:buildtarget-1/> and <_:buildtarget-2/> stages of the <application>NanoBSD</application> build process, as well as internal options passed to the main build process of <application>NanoBSD</application>. Through these options it is possible to cut the system down, so it will fit on as little as 64MB. You can use the configuration options to trim down FreeBSD even more, until it will consists of just the kernel and two or three files in the userland.
The configuration file consists of configuration options, which override the default values. The most important directives are:
<literal>NANO_NAME</literal> — Name of build (used to construct the workdir names).
<literal>NANO_SRC</literal> — Path to the source tree used to build the image.
<literal>NANO_KERNEL</literal> — Name of kernel configuration file used to build kernel.
<literal>CONF_BUILD</literal> — Options passed to the <_:buildtarget-1/> stage of the build.
<literal>CONF_INSTALL</literal> — Options passed to the <_:buildtarget-1/> stage of the build.
<literal>CONF_WORLD</literal> — Options passed to both the <_:buildtarget-1/> and the <_:buildtarget-2/> stage of the build.
<literal>FlashDevice</literal> — Defines what type of media to use. Check <filename>FlashDevice.sub</filename> for more details.
Custom Functions
It is possible to fine-tune <application>NanoBSD</application> using shell functions in the configuration file. The following example illustrates the basic model of custom functions:
cust_foo () (
echo "bar=baz" &gt; \
customize_cmd cust_foo
A more useful example of a customization function is the following, which changes the default size of the <filename>/etc</filename> directory from 5MB to 30MB:
cust_etc_size () (
cd ${NANO_WORLDDIR}/conf
echo 30000 &gt; default/etc/md_size
customize_cmd cust_etc_size
There are a few default pre-defined customization functions ready for use:
<literal>cust_comconsole</literal> — Disables <citerefentry><refentrytitle>getty</refentrytitle><manvolnum>8</manvolnum></citerefentry> on the VGA devices (the <filename>/dev/ttyv*</filename> device nodes) and enables the use of the COM1 serial port as the system console.
<literal>cust_allow_ssh_root</literal> — Allow <systemitem class="username">root</systemitem> to login via <citerefentry><refentrytitle>sshd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
<literal>cust_install_files</literal> — Installs files from the <filename>nanobsd/Files</filename> directory, which contains some useful scripts for system administration.
Adding Packages
Packages can be added to a <application>NanoBSD</application> image using a custom function. The following function will install all the packages located in <filename>/usr/src/tools/tools/nanobsd/packages</filename>:
install_packages () (
mkdir -p ${NANO_WORLDDIR}/packages
cp /usr/src/tools/tools/nanobsd/packages/* ${NANO_WORLDDIR}/packages
cp $(which pkg-static) ${NANO_WORLDDIR}/
chroot ${NANO_WORLDDIR} sh -c 'cd packages; /pkg-static add *;cd ..;'
rm -rf ${NANO_WORLDDIR}/packages ${NANO_WORLDDIR}/pkg-static
customize_cmd install_packages


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