diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/apt.conf.5.xml | 32 | ||||
| -rw-r--r-- | doc/examples/configure-index | 9 |
2 files changed, 32 insertions, 9 deletions
diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml index e0ce0db40..92ac5ec04 100644 --- a/doc/apt.conf.5.xml +++ b/doc/apt.conf.5.xml @@ -90,7 +90,7 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; <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 part of the configuration tree. The - specified element and all its descendents are erased.</para> + specified element and all its descendants 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 @@ -312,16 +312,30 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; <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 + Per default the acquire methods can decompress <command>bzip2</command>, <command>lzma</command> + and <command>gzip</command> compressed files, with this setting more formats can be added + on the fly or the used method can be changed. The syntax for this 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 + </para><para>Also the <literal>Order</literal> subgroup can be used to define in which order + the acquire system will try to download the compressed files. The acquire system will try the first + and proceed with the next compression type in this list on error, so to prefer one over the other type + simple add the preferred type at first - not already added default types will be added at run time + to the end of the list, so e.g. <synopsis>Acquire::CompressionTypes::Order:: "gz";</synopsis> can + be used to prefer <command>gzip</command> compressed files over <command>bzip2</command> and <command>lzma</command>. + If <command>lzma</command> should be preferred over <command>gzip</command> and <command>bzip2</command> the + configure setting should look like this <synopsis>Acquire::CompressionTypes::Order { "lzma"; "gz"; };</synopsis> + 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 above (the inbuilt) setting is <literallayout>Dir::Bin::bzip2 "/bin/bzip2";</literallayout> - </para></listitem> + the bzip2 method (the inbuilt) setting is <literallayout>Dir::Bin::bzip2 "/bin/bzip2";</literallayout> + Note also that list entries specified on the commandline 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. + 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> </varlistentry> </variablelist> </para> diff --git a/doc/examples/configure-index b/doc/examples/configure-index index 5dc7b5246..8025fa4b4 100644 --- a/doc/examples/configure-index +++ b/doc/examples/configure-index @@ -246,6 +246,15 @@ Acquire { Options {"--ignore-time-conflict";} // not very useful on a normal system }; + + CompressionTypes + { + bz2 "bzip2"; + lzma "lzma"; + gz "gzip"; + + Order { "gz"; "lzma"; "bz2"; }; + }; }; // Directory layout |