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Document ?set and ?reset

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2012-12-09 11:46:51 -08:00
parent 14cdaf21fc
commit 10237e01b2
1 changed files with 43 additions and 1 deletions
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44
docs/configuration_file_basics.xml
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@ -1470,6 +1470,46 @@ SHELL cat /etc/shorewall/rules.d/*.rules 2&gt; /dev/null || true</programlisting
<para>Options that were not set in shorewall.conf will expand to their <para>Options that were not set in shorewall.conf will expand to their
default value.</para> default value.</para>
</note> </note>
<para>Beginning with Shorewall 4.5.11, variables can be altered by
compiler directives.</para>
<variablelist>
<varlistentry>
<term>?SET <replaceable>variable value</replaceable></term>
<listitem>
<para>The <replaceable>variable</replaceable> can be specified
either with or without a leading '$' to allow using both Perl and
Shell variable representation.</para>
<para>The <replaceable>value</replaceable> is a Perl-compatible
expression.</para>
<note>
<para>The Shorewall compiler performs variable expansion within
the expression. So variables are expanded even when they appear in
single quotes.</para>
</note>
<note>
<para>If a variable within the expression can contain a
non-numeric value, it is a good idea to enclose it in quotes.
Otherwise, the Shorewall compiler has to guess whether to enclose
the variable's value in quotes or not.</para>
</note>
</listitem>
</varlistentry>
<varlistentry>
<term>?RESET <replaceable>variable</replaceable></term>
<listitem>
<para>Removes the named <replaceable>variable</replaceable> from the
compiler's variable table.</para>
</listitem>
</varlistentry>
</variablelist>
</section> </section>
<section id="Conditional"> <section id="Conditional">
@ -1558,7 +1598,9 @@ SHELL cat /etc/shorewall/rules.d/*.rules 2&gt; /dev/null || true</programlisting
<para>If it is not found in any of those places, the <para>If it is not found in any of those places, the
<replaceable>variable</replaceable> is assumed to have a value of 0 <replaceable>variable</replaceable> is assumed to have a value of 0
(false).</para> (false) in Shorewall versions prior to 4.5.11. In 4.5.11 and later, it is
assumed to have the value '' (empty string which also evaluates to
false).</para>
<para>The setting in <filename>/etc/shorewall/params</filename> by be <para>The setting in <filename>/etc/shorewall/params</filename> by be
overridden at runtime, provided the setting in overridden at runtime, provided the setting in