support setting empty values (sanely) & removing support for

[apt.git] / doc / apt.conf.5.xml

diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml
index d5e18575797575f6637e611d9f2e5831060ee50e..2bb81425717c2c3fdcb709a5d98f90fa908d1b49 100644 (file)
--- a/doc/apt.conf.5.xml
+++ b/doc/apt.conf.5.xml
@@ -54,6 +54,8 @@
         configuration list - in which case it will be silently ignored.</para></listitem>
       <listitem><para>the main configuration file specified by
         <literal>Dir::Etc::main</literal></para></listitem>
+      <listitem><para>all options set in the binary specific configuration
+           subtree are moved into the root of the tree.</para></listitem>
       <listitem><para>the command line options are applied to override the
         configuration directives or to load even more configuration files.</para></listitem>
    </orderedlist>
@@ -334,8 +336,10 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
 
      <varlistentry><term><option>PDiffs</option></term>
         <listitem><para>Try to download deltas called <literal>PDiffs</literal> for
-        indexes (like <filename>Packages</filename> files) instead of downloading
-        whole ones. True by default.</para>
+        indexes (like <filename>Packages</filename> files) instead of
+        downloading whole ones. True by default. Preferably, this can be set
+        for specific &sources-list; entries or index files by using the
+        <option>PDiffs</option> option there.</para>
         <para>Two sub-options to limit the use of PDiffs are also available:
         <literal>FileLimit</literal> can be used to specify a maximum number of
         PDiff files should be downloaded to update a file. <literal>SizeLimit</literal>
@@ -345,6 +349,16 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
         </para></listitem>
      </varlistentry>
 
+     <varlistentry><term><option>By-Hash</option></term>
+        <listitem><para>Try to download indexes via an URI constructed from a
+        hashsum of the expected file rather than downloaded via a well-known
+        stable filename. True by default, but automatically disabled if the
+        source indicates no support for it. Usage can be forced with the special
+        value "force". Preferably, this can be set for specific &sources-list; entries
+        or index files by using the <option>By-Hash</option> option there.
+        </para></listitem>
+     </varlistentry>
+
      <varlistentry><term><option>Queue-Mode</option></term>
      <listitem><para>Queuing mode; <literal>Queue-Mode</literal> can be one of <literal>host</literal> or 
      <literal>access</literal> which determines how  APT parallelizes outgoing 
@@ -597,6 +611,15 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
         </para></listitem>
      </varlistentry>
 
+     <varlistentry><term><option>EnableSrvRecords</option></term>
+        <listitem><para>
+           This option controls if apt will use the DNS SRV server record
+           as specified in RFC 2782 to select an alternative server to
+           connect to.
+           The default is "true".
+        </para></listitem>
+     </varlistentry>
+
      <varlistentry><term><option>AllowInsecureRepositories</option></term>
         <listitem><para>
            Allow the update operation to load data files from
@@ -652,6 +675,24 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
    </variablelist>
  </refsect1>
 
+ <refsect1><title>Binary specific configuration</title>
+    <para>Especially with the introduction of the <command>apt</command> binary
+       it can be useful to set certain options only for a specific binary as
+       even options which look like they would effect only a certain binary like
+       <option>APT::Get::Show-Versions</option> effect
+       <command>apt-get</command> as well as <command>apt</command>.
+    </para>
+    <para>Setting an option for a specific binary only can be achieved by
+       setting the option inside the
+       <option>Binary::<replaceable>specific-binary</replaceable></option>
+       scope. Setting the option <option>APT::Get::Show-Versions</option> for
+       the <command>apt</command> only can e.g. by done by setting
+       <option>Binary::apt::APT::Get::Show-Versions</option> instead.</para>
+    <para>Note that as seen in the DESCRIPTION section further above you can't
+       set binary-specific options on the commandline itself nor in
+       configuration files loaded via the commandline.</para>
+ </refsect1>
+
  <refsect1><title>Directories</title>
 
    <para>The <literal>Dir::State</literal> section has directories that pertain to local