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docs: Document recent hook script extension 

Signed-off-by: Dmitry Nesterenko <dmitry.nesterenko@virtuozzo.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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Dmitry Nesterenko 2020-06-23 17:45:35 +03:00 committed by Michal Privoznik
parent feb83c1e71
commit 44699edb99
1 changed files with 27 additions and 0 deletions
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docs/hooks.html.in
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@ -36,6 +36,9 @@
<li>If your installation of libvirt has instead been compiled from
source, it is likely to be
<code>/usr/local/etc/libvirt/hooks/</code>.</li>
<li><span class="since">Since 6.5.0</span>, you can also place several
hook scripts in the directories
<code>/etc/libvirt/hooks/&lt;driver&gt;.d/</code>.</li>
</ul>
<p>To use hook scripts, you will need to create this <code>hooks</code>
directory manually, place the desired hook scripts inside, then make
@ -59,6 +62,10 @@
Executed when a network is started or stopped or an
interface is plugged/unplugged to/from the network</li>
</ul>
<p><span class="since">Since 6.5.0</span>, you can also have
several scripts with any name in the directories
<code>/etc/libvirt/hooks/&lt;driver&gt;.d/</code>. They are
executed in alphabetical order after main script.</p>
<br/>
<h2><a id="structure">Script structure</a></h2>
@ -191,6 +198,16 @@
script returns failure or the output XML is not valid, restore of the
image will be aborted. This hook may be used, e.g., to change
location of disk images for restored domains.</li>
<li><span class="since">Since 6.5.0</span>, you can also place several
hook scripts in the directory
<code>/etc/libvirt/hooks/qemu.d/</code>. They are executed in
alphabetical order after main script. In this case each script also
acts as filter and can modify the domain XML and print it out on
its standart output. This script output is passed to standard input
next script in order. Empty output from any script is also identical
to copying the input XML without changing it.
In case any script returns failure common process will be aborted,
but all scripts from the directory will are executed.</li>
<li><span class="since">Since 0.9.13</span>, the qemu hook script
is also called when the libvirtd daemon restarts and reconnects
to previously running QEMU processes. If the script fails, the
@ -274,6 +291,16 @@
script returns failure or the output XML is not valid, incoming
migration will be canceled. This hook may be used, e.g., to change
location of disk images for incoming domains.</li>
<li><span class="since">Since 6.5.0</span>, you can also place several
hook scripts in the directory
<code>/etc/libvirt/hooks/libxl.d/</code>. They are executed in
alphabetical order after main script. In this case each script also
acts as filter and can modify the domain XML and print it out on
its standart output. This script output is passed to standard input
next script in order. Empty output from any script is also identical
to copying the input XML without changing it.
In case any script returns failure common process will be aborted,
but all scripts from the directory will are executed.</li>
<li><span class="since">Since 2.1.0</span>, the libxl hook script
is also called when the libvirtd daemon restarts and reconnects
to previously running Xen domains. If the script fails, the