<literal>Valid-Until</literal> header, but if they don't or a
stricter value is desired the <literal>Max-ValidTime</literal>
option below can be used.
+ The <option>Check-Valid-Until</option> option of &sources-list; entries should be
+ preferred to disable the check selectively instead of using this global override.
</para></listitem>
</varlistentry>
the earlier date of the two is used as the expiration date.
The default value is <literal>0</literal> which stands for "valid forever".
Archive specific settings can be made by appending the label of the archive
- to the option name.
+ to the option name. Preferably, the same can be achieved for specific
+ &sources-list; entries by using the <option>Valid-Until-Max</option> option there.
</para></listitem>
</varlistentry>
frequently 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.
+ the archive to the option name. Preferably, the same can be achieved for specific
+ &sources-list; entries by using the <option>Valid-Until-Min</option> option there.
</para></listitem>
</varlistentry>
<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>
</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
<para>
The configuration item <literal>RootDir</literal> has a special
- meaning. If set, all paths in <literal>Dir::</literal> will be
+ meaning. If set, all paths 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>/var/lib/dpkg/status</filename>, then the status file
will be looked up in
<filename>/tmp/staging/var/lib/dpkg/status</filename>.
+ If you want to prefix only relative paths, set <literal>Dir</literal> instead.
</para>
<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
- protocol version, the APT configuration space and the packages, files
- and versions being changed. Version 3 adds the architecture and <literal>MultiArch</literal>
- flag to each version being dumped.</para>
+ <para>Version 2 of this protocol sends more information through the requested
+ file descriptor: a line with the text <literal>VERSION 2</literal>,
+ the APT configuration space, and a list of package actions with filename
+ and version information.</para>
+
+ <para>Each configuration directive line has the form
+ <literal>key=value</literal>. Special characters (equal signs, newlines,
+ nonprintable characters, quotation marks, and percent signs in
+ <literal>key</literal> and newlines, nonprintable characters, and percent
+ signs in <literal>value</literal>) are %-encoded. Lists are represented
+ by multiple <literal>key::=value</literal> lines with the same key. The
+ configuration section ends with a blank line.</para>
+
+ <para>Package action lines consist of five fields in Version 2: old version, direction
+ of version change (< for upgrades, > for downgrades, = for no
+ change), new version, action. The version fields are "-" for no version
+ at all (for example when installing a package for the first time; no
+ version is treated as earlier than any real version, so that is an
+ upgrade, indicated as <literal>- < 1.23.4</literal>). The action field
+ is "**CONFIGURE**" if the package is being configured, "**REMOVE**" if it
+ is being removed, or the filename of a .deb file if it is being
+ unpacked.</para>
+
+ <para>In Version 3 after each version field follows the architecture
+ of this version, which is "-" if there is no version, and a field showing
+ the MultiArch type "same", foreign", "allowed" or "none". Note that "none"
+ is an incorrect typename which is just kept to remain compatible, it
+ should be read as "no" and users are encouraged to support both.</para>
<para>The version of the protocol to be used for the command
<literal><replaceable>cmd</replaceable></literal> can be chosen by setting
projects / apt.git / blobdiff