merged r1970 lp:~vorlon/apt/lp.968828

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

diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml
index c138502b703edc986af9cae328a56df171e8a281..c2220b1bf166ed30759c56c068e4d0e5717a55f4 100644 (file)
--- a/doc/apt.conf.5.xml
+++ b/doc/apt.conf.5.xml
@@ -5,6 +5,9 @@
 <!ENTITY % aptent SYSTEM "apt.ent">
 %aptent;
 
 <!ENTITY % aptent SYSTEM "apt.ent">
 %aptent;
 

+<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent">
+%aptverbatiment;
+

 ]>
 
 <refentry>
 ]>
 
 <refentry>


@@ -47,10 +50,12 @@
       <listitem><para>the file specified by the <envar>APT_CONFIG</envar>
         environment variable (if any)</para></listitem>
       <listitem><para>all files in <literal>Dir::Etc::Parts</literal> in
       <listitem><para>the file specified by the <envar>APT_CONFIG</envar>
         environment variable (if any)</para></listitem>
       <listitem><para>all files in <literal>Dir::Etc::Parts</literal> in

-        alphanumeric ascending order which have no or "<literal>conf</literal>"
+        alphanumeric ascending order which have either no or "<literal>conf</literal>"

         as filename extension and which only contain alphanumeric,
         as filename extension and which only contain alphanumeric,

-        hyphen (-), underscore (_) and period (.) characters -
-        otherwise they will be silently ignored.</para></listitem>
+        hyphen (-), underscore (_) and period (.) characters.
+        Otherwise APT will print a notice that it has ignored a file if the file
+        doesn't match a pattern in the <literal>Dir::Ignore-Files-Silently</literal>
+        configuration list - in this 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>the command line options are applied to override the
       <listitem><para>the main configuration file specified by
         <literal>Dir::Etc::main</literal></para></listitem>
       <listitem><para>the command line options are applied to override the


@@ -148,12 +153,21 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
      parsing package lists. The internal default is the architecture apt was 
      compiled for.</para></listitem>
      </varlistentry>
      parsing package lists. The internal default is the architecture apt was 
      compiled for.</para></listitem>
      </varlistentry>

-     
+
+     <varlistentry><term>Architectures</term>
+     <listitem><para>All Architectures the system supports. Processors implementing the <literal>amd64</literal>
+     are e.g. also able to execute binaries compiled for <literal>i386</literal>; This list is use when fetching files and
+     parsing package lists. The internal default is always the native architecture (<literal>APT::Architecture</literal>)
+     and all foreign architectures it can retrieve by calling <command>dpkg --print-foreign-architectures</command>.
+     </para></listitem>
+     </varlistentry>
+

      <varlistentry><term>Default-Release</term>
      <varlistentry><term>Default-Release</term>

-        <listitem><para>Default release to install packages from if more than one
-        version available. Contains release name, codename or release version. Examples: 'stable', 'testing', 'unstable', 'lenny', 'squeeze', '4.0', '5.0*'. See also &apt-preferences;.</para></listitem>
+     <listitem><para>Default release to install packages from if more than one
+     version available. Contains release name, codename or release version. Examples: 'stable', 'testing',
+     'unstable', '&stable-codename;', '&testing-codename;', '4.0', '5.0*'. See also &apt-preferences;.</para></listitem>

      </varlistentry>
      </varlistentry>

-     
+

      <varlistentry><term>Ignore-Hold</term>
      <listitem><para>Ignore Held packages; This global option causes the problem resolver to
      ignore held packages in its decision making.</para></listitem>
      <varlistentry><term>Ignore-Hold</term>
      <listitem><para>Ignore Held packages; This global option causes the problem resolver to
      ignore held packages in its decision making.</para></listitem>


@@ -198,9 +212,20 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
      anything that those packages depend on.</para></listitem>
      </varlistentry>
 
      anything that those packages depend on.</para></listitem>
      </varlistentry>
 

-     <varlistentry><term>Cache-Limit</term>
-     <listitem><para>APT uses a fixed size memory mapped cache file to store the 'available'
-     information. This sets the size of that cache (in bytes).</para></listitem>
+     <varlistentry><term>Cache-Start, Cache-Grow and Cache-Limit</term>
+     <listitem><para>APT uses since version 0.7.26 a resizable memory mapped cache file to store the 'available'
+     information. <literal>Cache-Start</literal> acts as a hint to which size the Cache will grow
+     and is therefore the amount of memory APT will request at startup. The default value is
+     20971520 bytes (~20 MB). Note that these amount of space need to be available for APT
+     otherwise it will likely fail ungracefully, so for memory restricted devices these value should
+     be lowered while on systems with a lot of configured sources this might be increased.
+     <literal>Cache-Grow</literal> defines in byte with the default of 1048576 (~1 MB) how much
+     the Cache size will be increased in the event the space defined by <literal>Cache-Start</literal>
+     is not enough. These value will be applied again and again until either the cache is big
+     enough to store all information or the size of the cache reaches the <literal>Cache-Limit</literal>.
+     The default of <literal>Cache-Limit</literal> is 0 which stands for no limit.
+     If <literal>Cache-Grow</literal> is set to 0 the automatic grow of the cache is disabled.
+     </para></listitem>

      </varlistentry>
 
      <varlistentry><term>Build-Essential</term>
      </varlistentry>
 
      <varlistentry><term>Build-Essential</term>


@@ -229,6 +254,39 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
    and the URI handlers. 
 
    <variablelist>
    and the URI handlers. 
 
    <variablelist>

+     <varlistentry><term>Check-Valid-Until</term>
+        <listitem><para>Security related option defaulting to true as an
+        expiring validation for a Release file prevents longtime replay attacks
+        and can e.g. also help users to identify no longer updated mirrors -
+        but the feature depends on the correctness of the time on the user system.
+        Archive maintainers are encouraged to create Release files with the
+        <literal>Valid-Until</literal> header, but if they don't or a stricter value
+        is volitional the following <literal>Max-ValidTime</literal> option can be used.
+        </para></listitem>
+     </varlistentry>
+
+     <varlistentry><term>Max-ValidTime</term>
+        <listitem><para>Seconds the Release file should be considered valid after
+        it was created (indicated by the <literal>Date</literal> header).
+        If the Release file itself includes a <literal>Valid-Until</literal> header
+        the earlier date of the two is used as the expiration date.
+        The default value is <literal>0</literal> which stands for "for ever".
+        Archive specific settings can be made by appending the label of the archive
+        to the option name.
+        </para></listitem>
+     </varlistentry>
+
+     <varlistentry><term>Min-ValidTime</term>
+        <listitem><para>Minimum of seconds the Release file should be considered
+        valid after it was created (indicated by the <literal>Date</literal> header).
+        Use this if you need to use a seldomly updated (local) mirror of a more
+        regular updated archive with a <literal>Valid-Until</literal> header
+        instead of completely disabling the expiration date checking.
+        Archive specific settings can and should be used by appending the label of
+        the archive to the option name.
+        </para></listitem>
+     </varlistentry>
+

      <varlistentry><term>PDiffs</term>
         <listitem><para>Try to download deltas called <literal>PDiffs</literal> for
         Packages or Sources files instead of downloading whole ones. True
      <varlistentry><term>PDiffs</term>
         <listitem><para>Try to download deltas called <literal>PDiffs</literal> for
         Packages or Sources files instead of downloading whole ones. True


@@ -236,7 +294,7 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
         <para>Two sub-options to limit the use of PDiffs are also available:
         With <literal>FileLimit</literal> can be specified how many PDiff files
         are downloaded at most to patch a file. <literal>SizeLimit</literal>
         <para>Two sub-options to limit the use of PDiffs are also available:
         With <literal>FileLimit</literal> can be specified how many PDiff files
         are downloaded at most to patch a file. <literal>SizeLimit</literal>

-        on the other hand is the maximum precentage of the size of all patches
+        on the other hand is the maximum percentage of the size of all patches

         compared to the size of the targeted file. If one of these limits is
         exceeded the complete file is downloaded instead of the patches.
         </para></listitem>
         compared to the size of the targeted file. If one of these limits is
         exceeded the complete file is downloaded instead of the patches.
         </para></listitem>


@@ -400,16 +458,45 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
      It is not needed to add <literal>bz2</literal> explicit to the list as it will be added automatic.</para>
      <para>Note that at run time the <literal>Dir::Bin::<replaceable>Methodname</replaceable></literal> will
      be checked: If this setting exists the method will only be used if this file exists, e.g. for
      It is not needed to add <literal>bz2</literal> explicit to the list as it will be added automatic.</para>
      <para>Note that at run time the <literal>Dir::Bin::<replaceable>Methodname</replaceable></literal> will
      be checked: If this setting exists the method will only be used if this file exists, e.g. for

-     the bzip2 method (the inbuilt) setting is <literallayout>Dir::Bin::bzip2 "/bin/bzip2";</literallayout>
+     the bzip2 method (the inbuilt) setting is: <literallayout>Dir::Bin::bzip2 "/bin/bzip2";</literallayout>

      Note also that list entries specified on the command line will be added at the end of the list
      specified in the configuration files, but before the default entries. To prefer a type in this case
      Note also that list entries specified on the command line will be added at the end of the list
      specified in the configuration files, but before the default entries. To prefer a type in this case

-     over the ones specified in in the configuration files you can set the option direct - not in list style.
+     over the ones specified in the configuration files you can set the option direct - not in list style.

      This will not override the defined list, it will only prefix the list with this type.</para>
      This will not override the defined list, it will only prefix the list with this type.</para>

-     <para>While it is possible to add an empty compression type to the order list, but APT in its current
-     version doesn't understand it correctly and will display many warnings about not downloaded files -
-     these warnings are most of the time false negatives. Future versions will maybe include a way to
-     really prefer uncompressed files to support the usage of local mirrors.</para></listitem>
+     <para>The special type <literal>uncompressed</literal> can be used to give uncompressed files a
+     preference, but note that most archives don't provide uncompressed files so this is mostly only
+     useable for local mirrors.</para></listitem>
+     </varlistentry>
+
+     <varlistentry><term>GzipIndexes</term>
+        <listitem><para>
+        When downloading <literal>gzip</literal> compressed indexes (Packages, Sources, or
+        Translations), keep them gzip compressed locally instead of unpacking
+        them. This saves quite a lot of disk space at the expense of more CPU
+        requirements when building the local package caches. False by default.
+        </para></listitem>

      </varlistentry>
      </varlistentry>

+
+     <varlistentry><term>Languages</term>
+     <listitem><para>The Languages subsection controls which <filename>Translation</filename> files are downloaded
+     and in which order APT tries to display the Description-Translations. APT will try to display the first
+     available Description in the Language which is listed at first. Languages can be defined with their
+     short or long Languagecodes. Note that not all archives provide <filename>Translation</filename>
+     files for every Language - especially the long Languagecodes are rare, so please
+     inform you which ones are available before you set here impossible values.</para>
+     <para>The default list includes "environment" and "en". "<literal>environment</literal>" has a special meaning here:
+     It will be replaced at runtime with the languagecodes extracted from the <literal>LC_MESSAGES</literal> environment variable.
+     It will also ensure that these codes are not included twice in the list. If <literal>LC_MESSAGES</literal>
+     is set to "C" only the <filename>Translation-en</filename> file (if available) will be used.
+     To force apt to use no Translation file use the setting <literal>Acquire::Languages=none</literal>. "<literal>none</literal>"
+     is another special meaning code which will stop the search for a fitting <filename>Translation</filename> file.
+     This can be used by the system administrator to let APT know that it should download also this files without
+     actually use them if the environment doesn't specify this languages. So the following example configuration will
+     result in the order "en, de" in an english and in "de, en" in a german localization. Note that "fr" is downloaded,
+     but not used if APT is not used in a french localization, in such an environment the order would be "fr, de, en".
+     <programlisting>Acquire::Languages { "environment"; "de"; "en"; "none"; "fr"; };</programlisting></para></listitem>
+     </varlistentry>
+

    </variablelist>
   </para>
  </refsect1>
    </variablelist>
   </para>
  </refsect1>


@@ -461,6 +548,15 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
      will be looked up in
      <filename>/tmp/staging/var/lib/dpkg/status</filename>.
    </para>
      will be looked up in
      <filename>/tmp/staging/var/lib/dpkg/status</filename>.
    </para>

+
+   <para>
+      The <literal>Ignore-Files-Silently</literal> list can be used to specify
+      which files APT should silently ignore while parsing the files in the
+      fragment directories. Per default a file which end with <literal>.disabled</literal>,
+      <literal>~</literal>, <literal>.bak</literal> or <literal>.dpkg-[a-z]+</literal>
+      is silently ignored. As seen in the last default value these patterns can use regular
+      expression syntax.
+   </para>

  </refsect1>
  
  <refsect1><title>APT in DSelect</title>
  </refsect1>
  
  <refsect1><title>APT in DSelect</title>


@@ -540,7 +636,7 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
 
    <refsect2><title>dpkg trigger usage (and related options)</title>
      <para>APT can call dpkg in a way so it can make aggressive use of triggers over
 
    <refsect2><title>dpkg trigger usage (and related options)</title>
      <para>APT can call dpkg in a way so it can make aggressive use of triggers over

-     multiply calls of dpkg. Without further options dpkg will use triggers only in between his
+     multiple calls of dpkg. Without further options dpkg will use triggers only in between his

      own run. Activating these options can therefore decrease the time needed to perform the
      install / upgrade. Note that it is intended to activate these options per default in the
      future, but as it changes the way APT calling dpkg drastically it needs a lot more testing.
      own run. Activating these options can therefore decrease the time needed to perform the
      install / upgrade. Note that it is intended to activate these options per default in the
      future, but as it changes the way APT calling dpkg drastically it needs a lot more testing.


@@ -1001,6 +1097,7 @@ is commented.
        </listitem>
      </varlistentry>
 -->
        </listitem>
      </varlistentry>
 -->

+

    </variablelist>
  </refsect1>
  
    </variablelist>
  </refsect1>