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man: Add docs for apply-live

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Let's try to keep up rigor around keeping the man pages up to date.
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Colin Walters 2021-03-04 17:38:19 +00:00 committed by OpenShift Merge Robot
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man/rpm-ostree.xml
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@ -656,12 +656,58 @@ Boston, MA 02111-1307, USA.
This command offers access to experimental features; command line
stability is not guaranteed. The available subcommands will be listed
by invoking <command>rpm-ostree ex</command>. For example, there is
<command>rpm-ostree ex livefs</command> which is an experimental
<command>rpm-ostree ex apply-live</command> which is an experimental
interface for applying changes to the booted deployment.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>ex apply-live</command></term>
<listitem>
<para>
Experimental feature; subject to change.
</para>
<para>
Given a target OSTree commit (defaults to the pending deployment), create a transient
<literal>overlayfs</literal> filesystem for <literal>/usr</literal>, and synchronize
the changes to the booted filesystem tree.
</para>
<para>
<option>--reset</option> to reset the filesystem tree to the booted commit.
</para>
<para>
<option>--target</option> may be used to target an arbitrary OSTree commit. This is an advanced feature, exposed mainly for testing.
</para>
<example>
<title>Install postgresql live</title>
<programlisting>$ rpm-ostree install postgresql-server
$ rpm-ostree ex apply-live
$ systemctl start postgresql # Some setup required
</programlisting>
</example>
<para>
Currently, this just synchronizes the filesystem; no systemd units are restarted
for example.
</para>
<para>
A major implicit benefit of the <literal>overlayfs</literal> approach is that
if something goes wrong in the middle of a <literal>apply-live</literal> operation,
a system reboot will implicitly remove the overlay, restoring the system to
the pristine deployment state.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>ex initramfs-etc</command></term>