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104 lines
2.5 KiB
XML
104 lines
2.5 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Development</title>
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<para>This chapter has some random notes on hacking on
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NixOS.</para>
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<section>
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<title>Building specific parts of NixOS</title>
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<para>
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<screen>
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$ nix-build /etc/nixos/nixos <replaceable>attr</replaceable></screen>
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where <replaceable>attr</replaceable> is an attribute in
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<filename>/etc/nixos/nixos/default.nix</filename>. Attributes of interest include:
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<variablelist>
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<varlistentry>
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<term><varname>kernel</varname></term>
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<listitem><para>The kernel.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>initialRamdisk</varname></term>
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<listitem><para>The initial ramdisk (initrd) for this configuration.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>bootStage1</varname></term>
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<listitem><para>The stage 1 (initrd) init script.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>bootStage2</varname></term>
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<listitem><para>The stage 2 init script.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>etc</varname></term>
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<listitem><para>The statically computed parts of <filename>/etc</filename>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>upstartJobs</varname></term>
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<listitem><para>An attribute set containing the Upstart jobs. For
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instance, the <varname>sshd</varname> Upstart job can be built by
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doing <literal>nix-build /etc/nixos/nixos -A
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upstartJobs.sshd</literal>.</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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</section>
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<section>
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<title>Testing the installer</title>
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<para>Building, burning, and booting from an installation CD is rather
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tedious, so here is a quick way to see if the installer works
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properly:
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<screen>
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$ nix-build .../nixos/configuration/rescue-cd.nix -A system.nixosInstall
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$ dd if=/dev/zero of=diskimage seek=2G count=0 bs=1
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$ yes | mke2fs -j diskimage
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$ mount -o loop diskimage /mnt
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$ ./result/bin/nixos-install</screen>
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</para>
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</section>
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<section>
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<title>Testing the <literal>initrd</literal></title>
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<para>A quick way to test whether the kernel and the initial ramdisk
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boot correctly is to use QEMU’s <option>-kernel</option> and
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<option>-initrd</option> options:
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<screen>
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$ nix-build /etc/nixos/nixos -A initialRamdisk -o initrd
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$ nix-build /etc/nixos/nixos -A kernel -o kernel
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$ qemu-system-x86_64 -kernel ./kernel/vmlinuz -initrd ./initrd/initrd -hda /dev/null
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</screen>
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</para>
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</section>
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</chapter>
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