do not sent Last-Modified if we expect a changed file

[apt.git] / doc / sources.list.5.xml

diff --git a/doc/sources.list.5.xml b/doc/sources.list.5.xml
index 12a7773f54e74922ee8f7c54870131fe758d8b5b..8a8dc04b7ecc443f39793e24d74e52cb6fbd563f 100644 (file)
--- a/doc/sources.list.5.xml
+++ b/doc/sources.list.5.xml
@@ -36,7 +36,7 @@
       designed to support any number of active sources and a variety of source
       media. The files list one source per line (one line style) or contain multiline
       stanzas defining one or more sources per stanza (deb822 style), with the
-      most preferred source listed first. The information available from the
+      most preferred source listed first (in case a single version is available from more than one source). The information available from the
       configured sources is acquired by <command>apt-get update</command> (or
       by an equivalent command from another APT front-end).
    </para>
@@ -221,8 +221,41 @@ deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [.
                (<option>target</option>) is a multivalue option defining
                which download targets apt will try to acquire from this
                source. If not specified, the default set is defined by the
-               <option>APT::Acquire::Targets</option> configuration scope.
+               <option>Acquire::IndexTargets</option> configuration scope.
+               Aditionally, specific targets can be enabled or disabled by
+               using the identifier as field name instead of using this
+               multivalue option.
          </para></listitem>
+
+         <listitem><para><option>PDiffs</option> (<option>pdiffs</option>)
+               is a yes/no value which controls if APT should try to use PDiffs
+               to update old indexes instead of downloading the new indexes
+               entirely. The value of this option is ignored if the repository
+               doesn't announce the availability of PDiffs.  Defaults to the
+               value of the option with the same name for a specific index file
+               defined in the <option>Acquire::IndexTargets</option> scope,
+               which itself default to the value of configuration option
+               <option>Acquire::PDiffs</option> which defaults to
+               <literal>yes</literal>.
+         </para></listitem>
+
+         <listitem><para><option>By-Hash</option> (<option>by-hash</option>)
+               can have the value "yes", "no" or "force" and controls if APT
+               should try to acquire indexes via an URI constructed from a
+               hashsum of the expected file instead of using the well-known
+               stable filename of the index. Using this can avoid hashsum
+               mismatches, but requires a supporting mirror. The value
+               "yes"/"no" activates/disables the use of this feature if this
+               source indicates support for it, while "force" will enable the
+               feature regardless of what the source indicates.
+               Defaults to the value of the option of the same name for a
+               specific index file defined in the
+               <option>Acquire::IndexTargets</option> scope, which itself
+               defaults to the value of configuration option
+               <option>Acquire::By-Hash</option> which defaults to
+               <literal>yes</literal>.
+         </para></listitem>
+
        </itemizedlist>
 
        Further more, there are options which if set effect
@@ -232,6 +265,20 @@ deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [.
        anomalies.
 
        <itemizedlist>
+         <listitem><para><option>Trusted</option> (<option>trusted</option>)
+               is a tri-state value which defaults to APT deciding if a source
+               is considered trusted or if warnings should be raised before e.g.
+               packages are installed from this source. This option can be used
+               to override this decision either with the value <literal>yes</literal>,
+               which lets APT consider this source always as a trusted source
+               even if it has no or fails authentication checks by disabling parts
+               of &apt-secure; and should therefore only be used in a local and trusted
+               context (if at all) as otherwise security is breached. The opposite
+               can be achieved with the value no, which causes the source to be handled
+               as untrusted even if the authentication checks passed successfully.
+               The default value can't be set explicitly.
+         </para></listitem>
+
          <listitem><para><option>Signed-By</option> (<option>signed-by</option>)
                is either an absolute path to a keyring file (has to be
                accessible and readable for the <literal>_apt</literal> user,
@@ -264,14 +311,14 @@ deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [.
          </para></listitem>
 
          <listitem><para><option>Valid-Until-Min</option>
-               (<option>check-valid-min</option>) and
+               (<option>valid-until-min</option>) and
                <option>Valid-Until-Max</option>
                (<option>valid-until-max</option>) can be used to raise or
                lower the time period in seconds in which the data from this
                repository is considered valid. -Max can be especially useful
                if the repository provides no Valid-Until field on its Release
                file to set your own value, while -Min can be used to increase
-               the valid time on seldomly updated (local) mirrors of a more
+               the valid time on seldom updated (local) mirrors of a more
                frequently updated but less accessible archive (which is in the
                sources.list as well) instead of disabling the check entirely.
                Default to the value of the configuration options