<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
-
-<!ENTITY % aptent SYSTEM "apt.ent">
-%aptent;
-
-<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent">
-%aptverbatiment;
-
+<!ENTITY % aptent SYSTEM "apt.ent"> %aptent;
+<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent"> %aptverbatiment;
+<!ENTITY % aptvendor SYSTEM "apt-vendor.ent"> %aptvendor;
]>
<refentry>
&apt-email;
&apt-product;
<!-- The last update date -->
- <date>2012-05-21T00:00:00Z</date>
+ <date>2012-06-09T00:00:00Z</date>
</refentryinfo>
<refmeta>
DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};
</programlisting></informalexample>
- <para>In general the sample configuration file in
- <filename>&docdir;examples/apt.conf</filename> &configureindex;
+ <para>In general the sample configuration file &configureindex;
is a good guide for how it should look.</para>
<para>Case is not significant in names of configuration items, so in the
</para></listitem>
</varlistentry>
+ <varlistentry><term><option>Build-Profiles</option></term>
+ <listitem><para>
+ List of all build profiles enabled for build-dependency resolution,
+ without the "<literal>profile.</literal>" namespace prefix.
+ By default this list is empty. The <envar>DEB_BUILD_PROFILES</envar>
+ as used by &dpkg-buildpackage; overrides the list notation.
+ </para></listitem>
+ </varlistentry>
+
<varlistentry><term><option>Default-Release</option></term>
<listitem><para>Default release to install packages from if more than one
version is available. Contains release name, codename or release version. Examples: 'stable', 'testing',
<para>The setting <literal>Acquire::http::Pipeline-Depth</literal> can be used to
enable HTTP pipelining (RFC 2616 section 8.1.2.2) which can be beneficial e.g. on
high-latency connections. It specifies how many requests are sent in a pipeline.
- Previous APT versions had a default of 10 for this setting, but the default value
- is now 0 (= disabled) to avoid problems with the ever-growing amount of webservers
- and proxies which choose to not conform to the HTTP/1.1 specification.</para>
+ APT tries to detect and workaround misbehaving webservers and proxies at runtime, but
+ if you know that yours does not conform to the HTTP/1.1 specification pipelining can
+ be disabled by setting the value to 0. It is enabled by default with the value 10.</para>
<para><literal>Acquire::http::AllowRedirect</literal> controls whether APT will follow
redirects, which is enabled by default.</para>
- <para>The used bandwidth can be limited with <literal>Acquire::http::Dl-Limit</literal>
- which accepts integer values in kilobytes. The default value is 0 which deactivates
- the limit and tries to use all available bandwidth (note that this option implicitly
- disables downloading from multiple servers at the same time.)</para>
+ <para>The used bandwidth can be limited with
+ <literal>Acquire::http::Dl-Limit</literal> which accepts integer
+ values in kilobytes per second. The default value is 0 which
+ deactivates the limit and tries to use all available bandwidth.
+ Note that this option implicitly disables downloading from
+ multiple servers at the same time.</para>
<para><literal>Acquire::http::User-Agent</literal> can be used to set a different
User-Agent for the http download method as some proxies allow access for clients
only if the client uses a known identifier.</para>
+
+ <para><literal>Acquire::http::Proxy-Auto-Detect</literal> can be used to
+ specify an external command to discover the http proxy to use. Apt expects
+ the command to output the proxy on stdout in the style
+ <literal>http://proxy:port/</literal>. This will override the
+ generic <literal>Acquire::http::Proxy</literal> but not any specific
+ host proxy configuration set via
+ <literal>Acquire::http::Proxy::$HOST</literal>.
+
+ See the &squid-deb-proxy-client; package for an example implementation that
+ uses avahi. This option takes precedence over the legacy option name
+ <literal>ProxyAutoDetect</literal>.
+ </para>
+
</listitem>
</varlistentry>
</listitem>
</varlistentry>
+ <varlistentry><term><option>ForceIPv4</option></term>
+ <listitem><para>
+ When downloading, force to use only the IPv4 protocol.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><option>ForceIPv6</option></term>
+ <listitem><para>
+ When downloading, force to use only the IPv6 protocol.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><option>MaxReleaseFileSize</option></term>
+ <listitem><para>
+ The maximum file size of Release/Release.gpg/InRelease files.
+ The default is 10MB.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><option>AllowInsecureRepositories</option></term>
+ <listitem><para>
+ Allow the update operation to load data files from
+ a repository without a trusted signature. If enabled this
+ option no data files will be loaded and the update
+ operation fails with a error for this source. The default
+ is false for backward compatibility. This will be changed
+ in the future.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><option>AllowDowngradeToInsecureRepositories</option></term>
+ <listitem><para>
+ Allow that a repository that was previously gpg signed to become
+ unsigned durign a update operation. When there is no valid signature
+ of a perviously trusted repository apt will refuse the update. This
+ option can be used to override this protection. You almost certainly
+ never want to enable this. The default is false.
+
+ Note that apt will still consider packages from this source
+ untrusted and warn about them if you try to install
+ them.
+ </para></listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>
information, such as the two package caches <literal>srcpkgcache</literal> and
<literal>pkgcache</literal> as well as the location to place downloaded archives,
<literal>Dir::Cache::archives</literal>. Generation of caches can be turned off
- by setting their names to the empty string. This will slow down startup but
- save disk space. It is probably preferable to turn off the pkgcache rather
- than the srcpkgcache. Like <literal>Dir::State</literal> the default
- directory is contained in <literal>Dir::Cache</literal></para>
+ by setting <literal>pkgcache</literal> or <literal>srcpkgcache</literal> to
+ <literal>""</literal>. This will slow down startup but save disk space. It
+ is probably preferable to turn off the pkgcache rather than the srcpkgcache.
+ Like <literal>Dir::State</literal> the default directory is contained in
+ <literal>Dir::Cache</literal></para>
<para><literal>Dir::Etc</literal> contains the location of configuration files,
<literal>sourcelist</literal> gives the location of the sourcelist and
<literal>options</literal> this must be specified in list notation. The commands
are invoked in order using <filename>/bin/sh</filename>; should any fail APT
will abort. APT will pass the filenames of all .deb files it is going to
- install to the commands, one per line on standard input.</para>
+ install to the commands, one per line on the requested file descriptor, defaulting
+ to standard input.</para>
- <para>Version 2 of this protocol dumps more information, including the
+ <para>Version 2 of this protocol dumps more information, including the
protocol version, the APT configuration space and the packages, files
- and versions being changed. Version 2 is enabled by setting
- <literal>DPkg::Tools::options::cmd::Version</literal> to 2. <literal>cmd</literal> is a
- command given to <literal>Pre-Install-Pkgs</literal>.</para></listitem>
+ and versions being changed. Version 3 adds the architecture and <literal>MultiArch</literal>
+ flag to each version being dumped.</para>
+
+ <para>The version of the protocol to be used for the command
+ <literal><replaceable>cmd</replaceable></literal> can be chosen by setting
+ <literal>DPkg::Tools::options::<replaceable>cmd</replaceable>::Version</literal>
+ accordingly, the default being version 1. If APT isn't supporting the requested
+ version it will send the information in the highest version it has support for instead.
+ </para>
+
+ <para>The file descriptor to be used to send the information can be requested with
+ <literal>DPkg::Tools::options::<replaceable>cmd</replaceable>::InfoFD</literal>
+ which defaults to <literal>0</literal> for standard input and is available since
+ version 0.9.11. Support for the option can be detected by looking for the environment
+ variable <envar>APT_HOOK_INFO_FD</envar> which contains the number of the used
+ file descriptor as a confirmation.</para>
+ </listitem>
</varlistentry>
<varlistentry><term><option>Run-Directory</option></term>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>Debug::RunScripts</option></term>
+ <listitem>
+ <para>
+ Display the external commands that are called by apt hooks.
+ This includes e.g. the config options
+ <literal>DPkg::{Pre,Post}-Invoke</literal> or
+ <literal>APT::Update::{Pre,Post}-Invoke</literal>.
+ </para>
+ </listitem>
+ </varlistentry>
+
<!-- 2009/07/11 Currently used nowhere. The corresponding code
is commented.
<varlistentry>
projects / apt.git / blobdiff