<refentryinfo>
&apt-author.jgunthorpe;
&apt-author.team;
+ <author>
+ <firstname>Daniel</firstname>
+ <surname>Burrows</surname>
+ <contrib>Initial documentation of Debug::*.</contrib>
+ <email>dburrows@debian.org</email>
+ </author>
&apt-email;
&apt-product;
<!-- The last update date -->
- <date>29 February 2004</date>
+ <date>10 December 2008</date>
</refentryinfo>
<refmeta>
the APT tool group, for the Get tool. options do not inherit from their
parent groups.</para>
- <para>Syntacticly the configuration language is modeled after what the ISC tools
- such as bind and dhcp use. Lines starting with
- <literal>//</literal> are treated as comments (ignored).
+ <para>Syntactically the configuration language is modeled after what the ISC tools
+ such as bind and dhcp use. Lines starting with
+ <literal>//</literal> are treated as comments (ignored), as well as all text
+ between <literal>/*</literal> and <literal>*/</literal>, just like C/C++ comments.
Each line is of the form
<literal>APT::Get::Assume-Yes "true";</literal> The trailing
semicolon is required and the quotes are optional. A new scope can be
</programlisting></informalexample>
<para>with newlines placed to make it more readable. Lists can be created by
- opening a scope and including a single word enclosed in quotes followed by a
+ opening a scope and including a single string enclosed in quotes followed by a
semicolon. Multiple entries can be included, each separated by a semicolon.</para>
<informalexample><programlisting>
<filename>&docdir;examples/apt.conf</filename> &configureindex;
is a good guide for how it should look.</para>
+ <para>The names of the configuration items are not case-sensitive. So in the previous example
+ you could use <literal>dpkg::pre-install-pkgs</literal>.</para>
+
<para>Two specials are allowed, <literal>#include</literal> and <literal>#clear</literal>
<literal>#include</literal> will include the given file, unless the filename
ends in a slash, then the whole directory is included.
- <literal>#clear</literal> is used to erase a list of names.</para>
+ <literal>#clear</literal> is used to erase a part of the configuration tree. The
+ specified element and all its descendents are erased.</para>
<para>All of the APT tools take a -o option which allows an arbitrary configuration
directive to be specified on the command line. The syntax is a full option
compiled for.</para></listitem>
</varlistentry>
+ <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>
+ </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>
and the URI handlers.
<variablelist>
+ <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
+ by default.</para></listitem>
+ </varlistentry>
+
<varlistentry><term>Queue-Mode</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
standard form of <literal>http://[[user][:pass]@]host[:port]/</literal>. Per
host proxies can also be specified by using the form
<literal>http::Proxy::<host></literal> with the special keyword <literal>DIRECT</literal>
- meaning to use no proxies. The <envar>http_proxy</envar> environment variable
- will override all settings.</para>
+ meaning to use no proxies. If no one of the above settings is specified,
+ <envar>http_proxy</envar> environment variable
+ will be used.</para>
<para>Three settings are provided for cache control with HTTP/1.1 compliant
proxy caches. <literal>No-Cache</literal> tells the proxy to not use its cached
require this are in violation of RFC 2068.</para></listitem>
</varlistentry>
+ <varlistentry><term>https</term>
+ <listitem><para>HTTPS URIs. Cache-control and proxy options are the same as for
+ <literal>http</literal> method.
+ <literal>Pipeline-Depth</literal> option is not supported yet.</para>
+
+ <para><literal>CaInfo</literal> suboption specifies place of file that
+ holds info about trusted certificates.
+ <literal><host>::CaInfo</literal> is corresponding per-host option.
+ <literal>Verify-Peer</literal> boolean suboption determines whether verify
+ server's host certificate against trusted certificates or not.
+ <literal><host>::Verify-Peer</literal> is corresponding per-host option.
+ <literal>Verify-Host</literal> boolean suboption determines whether verify
+ server's hostname or not.
+ <literal><host>::Verify-Host</literal> is corresponding per-host option.
+ <literal>SslCert</literal> determines what certificate to use for client
+ authentication. <literal><host>::SslCert</literal> is corresponding per-host option.
+ <literal>SslKey</literal> determines what private key to use for client
+ authentication. <literal><host>::SslKey</literal> is corresponding per-host option.
+ <literal>SslForceVersion</literal> overrides default SSL version to use.
+ Can contain 'TLSv1' or 'SSLv3' string.
+ <literal><host>::SslForceVersion</literal> is corresponding per-host option.
+ </para></listitem></varlistentry>
+
<varlistentry><term>ftp</term>
- <listitem><para>FTP URIs; ftp::Proxy is the default proxy server to use. It is in the
- standard form of <literal>ftp://[[user][:pass]@]host[:port]/</literal> and is
- overridden by the <envar>ftp_proxy</envar> environment variable. To use a ftp
+ <listitem><para>FTP URIs; ftp::Proxy is the default ftp proxy to use. It is in the
+ standard form of <literal>ftp://[[user][:pass]@]host[:port]/</literal>. Per
+ host proxies can also be specified by using the form
+ <literal>ftp::Proxy::<host></literal> with the special keyword <literal>DIRECT</literal>
+ meaning to use no proxies. If no one of the above settings is specified,
+ <envar>ftp_proxy</envar> environment variable
+ will be used. To use a ftp
proxy you will have to set the <literal>ftp::ProxyLogin</literal> script in the
configuration file. This entry specifies the commands to send to tell
the proxy server what to connect to. Please see
&configureindex; for an example of
- how to do this. The subsitution variables available are
+ how to do this. The substitution variables available are
<literal>$(PROXY_USER)</literal> <literal>$(PROXY_PASS)</literal> <literal>$(SITE_USER)</literal>
<literal>$(SITE_PASS)</literal> <literal>$(SITE)</literal> and <literal>$(SITE_PORT)</literal>
Each is taken from it's respective URI component.</para>
not recommended to use FTP over HTTP due to its low efficiency.</para>
<para>The setting <literal>ForceExtended</literal> controls the use of RFC2428
- <literal>EPSV</literal> and <literal>EPRT</literal> commands. The defaut is false, which means
+ <literal>EPSV</literal> and <literal>EPRT</literal> commands. The default is false, which means
these commands are only used if the control connection is IPv6. Setting this
to true forces their use even on IPv4 connections. Note that most FTP servers
do not support RFC2428.</para></listitem>
</para></listitem>
</varlistentry>
+ <varlistentry><term>CompressionTypes</term>
+ <listitem><para>List of compression types which are understood by the acquire methods.
+ Files like <filename>Packages</filename> can be available in various compression formats.
+ This list defines in which order the acquire methods will try to download these files.
+ Per default <command>bzip2</command> compressed files will be prefered over
+ <command>lzma</command>, <command>gzip</command> and uncompressed files. The syntax for
+ the configuration fileentry is
+ <synopsis>Acquire::CompressionTypes::<replaceable>FileExtension</replaceable> "<replaceable>Methodname</replaceable>";</synopsis>
+ e.g. <synopsis>Acquire::CompressionTypes::bz2 "bzip2";</synopsis>
+ Note that at runtime 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 above (the inbuilt) setting is <literallayout>Dir::Bin::bzip2 "/bin/bzip2";</literallayout>
+ </para></listitem>
+ </varlistentry>
</variablelist>
</para>
</refsect1>
<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 be blank. This will slow down startup but
- save disk space. It is probably prefered to turn off the pkgcache rather
+ save disk space. It is probably preferred 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>
<literal>sourcelist</literal> gives the location of the sourcelist and
<literal>main</literal> is the default configuration file (setting has no effect,
unless it is done from the config file specified by
- <envar>APT_CONFIG</envar>.</para>
+ <envar>APT_CONFIG</envar>).</para>
<para>The <literal>Dir::Parts</literal> setting reads in all the config fragments in
lexical order from the directory specified. After this is done then the
<para>Binary programs are pointed to by <literal>Dir::Bin</literal>. <literal>Dir::Bin::Methods</literal>
specifies the location of the method handlers and <literal>gzip</literal>,
+ <literal>bzip2</literal>, <literal>lzma</literal>,
<literal>dpkg</literal>, <literal>apt-get</literal> <literal>dpkg-source</literal>
<literal>dpkg-buildpackage</literal> and <literal>apt-cache</literal> specify the location
of the respective programs.</para>
+
+ <para>
+ The configuration item <literal>RootDir</literal> has a special
+ meaning. If set, all paths in <literal>Dir::</literal> will be
+ relative to <literal>RootDir</literal>, <emphasis>even paths that
+ are specified absolutely</emphasis>. So, for instance, if
+ <literal>RootDir</literal> is set to
+ <filename>/tmp/staging</filename> and
+ <literal>Dir::State::status</literal> is set to
+ <filename>/var/lib/dpkg/status</filename>, then the status file
+ will be looked up in
+ <filename>/tmp/staging/var/lib/dpkg/status</filename>.
+ </para>
</refsect1>
<refsect1><title>APT in DSelect</title>
</variablelist>
</refsect1>
- <refsect1><title>Debug options</title>
- <para>Most of the options in the <literal>debug</literal> section are not interesting to
- the normal user, however <literal>Debug::pkgProblemResolver</literal> shows
- interesting output about the decisions dist-upgrade makes.
- <literal>Debug::NoLocking</literal> disables file locking so APT can do some
- operations as non-root and <literal>Debug::pkgDPkgPM</literal> will print out the
- command line for each dpkg invokation. <literal>Debug::IdentCdrom</literal> will
- disable the inclusion of statfs data in CDROM IDs.
- <literal>Debug::Acquire::gpgv</literal> Debugging of the gpgv method.
+ <refsect1>
+ <title>Periodic and Archives options</title>
+ <para><literal>APT::Periodic</literal> and <literal>APT::Archives</literal>
+ groups of options configure behavior of apt periodic updates, which is
+ done by <literal>/etc/cron.daily/apt</literal> script. See header of
+ this script for the brief documentation of these options.
</para>
</refsect1>
+
+ <refsect1>
+ <title>Debug options</title>
+ <para>
+ Enabling options in the <literal>Debug::</literal> section will
+ cause debugging information to be sent to the standard error
+ stream of the program utilizing the <literal>apt</literal>
+ libraries, or enable special program modes that are primarily
+ useful for debugging the behavior of <literal>apt</literal>.
+ Most of these options are not interesting to a normal user, but a
+ few may be:
+
+ <itemizedlist>
+ <listitem>
+ <para>
+ <literal>Debug::pkgProblemResolver</literal> enables output
+ about the decisions made by
+ <literal>dist-upgrade, upgrade, install, remove, purge</literal>.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ <literal>Debug::NoLocking</literal> disables all file
+ locking. This can be used to run some operations (for
+ instance, <literal>apt-get -s install</literal>) as a
+ non-root user.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ <literal>Debug::pkgDPkgPM</literal> prints out the actual
+ command line each time that <literal>apt</literal> invokes
+ &dpkg;.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ <literal>Debug::IdentCdrom</literal> disables the inclusion
+ of statfs data in CDROM IDs. <!-- TODO: provide a
+ motivating example, except I haven't a clue why you'd want
+ to do this. -->
+ </para>
+ </listitem>
+ </itemizedlist>
+ </para>
+
+ <para>
+ A full list of debugging options to apt follows.
+ </para>
+
+ <variablelist>
+ <varlistentry>
+ <term><literal>Debug::Acquire::cdrom</literal></term>
+
+ <listitem>
+ <para>
+ Print information related to accessing
+ <literal>cdrom://</literal> sources.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::Acquire::ftp</literal></term>
+
+ <listitem>
+ <para>
+ Print information related to downloading packages using
+ FTP.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::Acquire::http</literal></term>
+
+ <listitem>
+ <para>
+ Print information related to downloading packages using
+ HTTP.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::Acquire::https</literal></term>
+
+ <listitem>
+ <para>
+ Print information related to downloading packages using
+ HTTPS.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::Acquire::gpgv</literal></term>
+
+ <listitem>
+ <para>
+ Print information related to verifying cryptographic
+ signatures using <literal>gpg</literal>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::aptcdrom</literal></term>
+
+ <listitem>
+ <para>
+ Output information about the process of accessing
+ collections of packages stored on CD-ROMs.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::BuildDeps</literal></term>
+ <listitem>
+ <para>
+ Describes the process of resolving build-dependencies in
+ &apt-get;.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::Hashes</literal></term>
+ <listitem>
+ <para>
+ Output each cryptographic hash that is generated by the
+ <literal>apt</literal> libraries.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::IdentCDROM</literal></term>
+ <listitem>
+ <para>
+ Do not include information from <literal>statfs</literal>,
+ namely the number of used and free blocks on the CD-ROM
+ filesystem, when generating an ID for a CD-ROM.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::NoLocking</literal></term>
+ <listitem>
+ <para>
+ Disable all file locking. For instance, this will allow
+ two instances of <quote><literal>apt-get
+ update</literal></quote> to run at the same time.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAcquire</literal></term>
+
+ <listitem>
+ <para>
+ Log when items are added to or removed from the global
+ download queue.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAcquire::Auth</literal></term>
+ <listitem>
+ <para>
+ Output status messages and errors related to verifying
+ checksums and cryptographic signatures of downloaded files.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAcquire::Diffs</literal></term>
+ <listitem>
+ <para>
+ Output information about downloading and applying package
+ index list diffs, and errors relating to package index list
+ diffs.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAcquire::RRed</literal></term>
+
+ <listitem>
+ <para>
+ Output information related to patching apt package lists
+ when downloading index diffs instead of full indices.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAcquire::Worker</literal></term>
+
+ <listitem>
+ <para>
+ Log all interactions with the sub-processes that actually
+ perform downloads.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgAutoRemove</literal></term>
+
+ <listitem>
+ <para>
+ Log events related to the automatically-installed status of
+ packages and to the removal of unused packages.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgDepCache::AutoInstall</literal></term>
+ <listitem>
+ <para>
+ Generate debug messages describing which packages are being
+ automatically installed to resolve dependencies. This
+ corresponds to the initial auto-install pass performed in,
+ e.g., <literal>apt-get install</literal>, and not to the
+ full <literal>apt</literal> dependency resolver; see
+ <literal>Debug::pkgProblemResolver</literal> for that.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgDepCache::Marker</literal></term>
+ <listitem>
+ <para>
+ Generate debug messages describing which package is marked
+ as keep/install/remove while the ProblemResolver does his work.
+ Each addition or deletion may trigger additional actions;
+ they are shown indented two additional space under the original entry.
+ The format for each line is <literal>MarkKeep</literal>,
+ <literal>MarkDelete</literal> or <literal>MarkInstall</literal> followed by
+ <literal>package-name <a.b.c -> d.e.f | x.y.z> (section)</literal>
+ where <literal>a.b.c</literal> is the current version of the package,
+ <literal>d.e.f</literal> is the version considered for installation and
+ <literal>x.y.z</literal> is a newer version, but not considered for installation
+ (because of a low pin score). The later two can be omitted if there is none or if
+ it is the same version as the installed.
+ <literal>section</literal> is the name of the section the package appears in.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <!-- Question: why doesn't this do anything? The code says it should. -->
+ <varlistentry>
+ <term><literal>Debug::pkgInitConfig</literal></term>
+ <listitem>
+ <para>
+ Dump the default configuration to standard error on
+ startup.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgDPkgPM</literal></term>
+ <listitem>
+ <para>
+ When invoking &dpkg;, output the precise command line with
+ which it is being invoked, with arguments separated by a
+ single space character.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgDPkgProgressReporting</literal></term>
+ <listitem>
+ <para>
+ Output all the data received from &dpkg; on the status file
+ descriptor and any errors encountered while parsing it.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgOrderList</literal></term>
+
+ <listitem>
+ <para>
+ Generate a trace of the algorithm that decides the order in
+ which <literal>apt</literal> should pass packages to
+ &dpkg;.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgPackageManager</literal></term>
+
+ <listitem>
+ <para>
+ Output status messages tracing the steps performed when
+ invoking &dpkg;.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgPolicy</literal></term>
+
+ <listitem>
+ <para>
+ Output the priority of each package list on startup.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgProblemResolver</literal></term>
+
+ <listitem>
+ <para>
+ Trace the execution of the dependency resolver (this
+ applies only to what happens when a complex dependency
+ problem is encountered).
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::pkgProblemResolver::ShowScores</literal></term>
+ <listitem>
+ <para>
+ Display a list of all installed packages with their calculated score
+ used by the pkgProblemResolver. The description of the package
+ is the same as described in <literal>Debug::pkgDepCache::Marker</literal>
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>Debug::sourceList</literal></term>
+
+ <listitem>
+ <para>
+ Print information about the vendors read from
+ <filename>/etc/apt/vendors.list</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+<!-- 2009/07/11 Currently used nowhere. The corresponding code
+is commented.
+ <varlistentry>
+ <term><literal>Debug::Vendor</literal></term>
+
+ <listitem>
+ <para>
+ Print information about each vendor.
+ </para>
+ </listitem>
+ </varlistentry>
+-->
+ </variablelist>
+ </refsect1>
<refsect1><title>Examples</title>
<para>&configureindex; is a
</refsect1>
<refsect1><title>Files</title>
- <para><filename>/etc/apt/apt.conf</filename></para>
+ <variablelist>
+ <varlistentry><term><filename>/etc/apt/apt.conf</filename></term>
+ <listitem><para>APT configuration file.
+ Configuration Item: <literal>Dir::Etc::Main</literal>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry><term><filename>/etc/apt/apt.conf.d/</filename></term>
+ <listitem><para>APT configuration file fragments.
+ Configuration Item: <literal>Dir::Etc::Parts</literal>.</para></listitem>
+ </varlistentry>
+ </variablelist>
</refsect1>
<refsect1><title>See Also</title>
projects / apt.git / blobdiff