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nixos/manual: Document boot.debug1mounts and clarify what exit does with shell_on_fail (#89365)

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* nixos/manual: document boot.debug1mounts

* nixos/manual: clarify what `exit` does with shell_on_fail
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jakobrs 2020-06-17 13:36:06 +00:00 committed by GitHub
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31
nixos/doc/manual/administration/boot-problems.xml
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@ -19,9 +19,9 @@
</term>
<listitem>
<para>
Start a root shell if something goes wrong in stage 1 of the boot process
(the initial ramdisk). This is disabled by default because there is no
authentication for the root shell.
Allows the user to start a root shell if something goes wrong in stage 1
of the boot process (the initial ramdisk). This is disabled by default
because there is no authentication for the root shell.
</para>
</listitem>
</varlistentry>
@ -49,6 +49,22 @@
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<literal>boot.debug1mounts</literal>
</term>
<listitem>
<para>
Like <literal>boot.debug1</literal> or
<literal>boot.debug1devices</literal>, but runs stage1 until all
filesystems that are mounted during initrd are mounted (see
<option><link linkend="opt-fileSystems._name__.neededForBoot">neededForBoot</link></option>
). As a motivating example, this could be useful if you've forgotten to set
<option><link linkend="opt-fileSystems._name__.neededForBoot">neededForBoot</link></option>
on a file system.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<literal>boot.trace</literal>
@ -90,6 +106,15 @@
<manvolnum>1</manvolnum></citerefentry>.
</para>
<para>
Notice that for <literal>boot.shell_on_fail</literal>,
<literal>boot.debug1</literal>, <literal>boot.debug1devices</literal>, and
<literal>boot.debug1mounts</literal>, if you did <emphasis>not</emphasis>
select "start the new shell as pid 1", and you <literal>exit</literal> from
the new shell, boot will proceed normally from the point where it failed, as
if you'd chosen "ignore the error and continue".
</para>
<para>
If no login prompts or X11 login screens appear (e.g. due to hanging
dependencies), you can press Alt+ArrowUp. If you’re lucky, this will start