forked from mirrors/nixpkgs
fe744d3fb1
Because when I see "config.system.build.manual.manual" after I forgot what it means I ask "Why do I need that second `.manual` there again?". Doesn't happen with `config.system.build.manual.manualHTML`.
122 lines
3.8 KiB
XML
122 lines
3.8 KiB
XML
<chapter 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-building-parts">
|
||
<title>Building Specific Parts of NixOS</title>
|
||
<para>
|
||
With the command <command>nix-build</command>, you can build specific parts
|
||
of your NixOS configuration. This is done as follows:
|
||
<screen>
|
||
$ cd <replaceable>/path/to/nixpkgs/nixos</replaceable>
|
||
$ nix-build -A config.<replaceable>option</replaceable></screen>
|
||
where <replaceable>option</replaceable> is a NixOS option with type
|
||
“derivation” (i.e. something that can be built). Attributes of interest
|
||
include:
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>system.build.toplevel</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
The top-level option that builds the entire NixOS system. Everything else
|
||
in your configuration is indirectly pulled in by this option. This is
|
||
what <command>nixos-rebuild</command> builds and what
|
||
<filename>/run/current-system</filename> points to afterwards.
|
||
</para>
|
||
<para>
|
||
A shortcut to build this is:
|
||
<screen>
|
||
$ nix-build -A system</screen>
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>system.build.manual.manualHTML</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
The NixOS manual.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>system.build.etc</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
A tree of symlinks that form the static parts of
|
||
<filename>/etc</filename>.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>system.build.initialRamdisk</varname>
|
||
</term>
|
||
<term>
|
||
<varname>system.build.kernel</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
The initial ramdisk and kernel of the system. This allows a quick way to
|
||
test whether the kernel and the initial ramdisk boot correctly, by using
|
||
QEMU’s <option>-kernel</option> and <option>-initrd</option> options:
|
||
<screen>
|
||
$ nix-build -A config.system.build.initialRamdisk -o initrd
|
||
$ nix-build -A config.system.build.kernel -o kernel
|
||
$ qemu-system-x86_64 -kernel ./kernel/bzImage -initrd ./initrd/initrd -hda /dev/null
|
||
</screen>
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>system.build.nixos-rebuild</varname>
|
||
</term>
|
||
<term>
|
||
<varname>system.build.nixos-install</varname>
|
||
</term>
|
||
<term>
|
||
<varname>system.build.nixos-generate-config</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
These build the corresponding NixOS commands.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term>
|
||
<varname>systemd.units.<replaceable>unit-name</replaceable>.unit</varname>
|
||
</term>
|
||
<listitem>
|
||
<para>
|
||
This builds the unit with the specified name. Note that since unit names
|
||
contain dots (e.g. <literal>httpd.service</literal>), you need to put
|
||
them between quotes, like this:
|
||
<screen>
|
||
$ nix-build -A 'config.systemd.units."httpd.service".unit'
|
||
</screen>
|
||
You can also test individual units, without rebuilding the whole system,
|
||
by putting them in <filename>/run/systemd/system</filename>:
|
||
<screen>
|
||
$ cp $(nix-build -A 'config.systemd.units."httpd.service".unit')/httpd.service \
|
||
/run/systemd/system/tmp-httpd.service
|
||
# systemctl daemon-reload
|
||
# systemctl start tmp-httpd.service
|
||
</screen>
|
||
Note that the unit must not have the same name as any unit in
|
||
<filename>/etc/systemd/system</filename> since those take precedence over
|
||
<filename>/run/systemd/system</filename>. That’s why the unit is
|
||
installed as <filename>tmp-httpd.service</filename> here.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</para>
|
||
</chapter>
|