X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/e85b4cd500cc96a8ce0d35c5e63fe274bed5b917..e4b16ac68196eab5e58abf715459fe70c199cff3:/doc/apt.conf.5.xml diff --git a/doc/apt.conf.5.xml b/doc/apt.conf.5.xml index d347bda67..a12524328 100644 --- a/doc/apt.conf.5.xml +++ b/doc/apt.conf.5.xml @@ -21,12 +21,13 @@ &apt-email; &apt-product; - 10 December 2008 + 18 September 2009 apt.conf 5 + APT @@ -58,8 +59,12 @@ between /* and */, just like C/C++ comments. Each line is of the form APT::Get::Assume-Yes "true"; The trailing - semicolon is required and the quotes are optional. A new scope can be - opened with curly braces, like: + semicolon and the quotes are required. The value must be on one line, and + there is no kind of string concatenation. It must not include inside quotes. + The behavior of the backslash "\" and escaped characters inside a value is + undefined and it should not be used. An option name may include + alphanumerical characters and the "/-:._+" characters. A new scope can + be opened with curly braces, like: APT { @@ -85,17 +90,41 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; The names of the configuration items are not case-sensitive. So in the previous example you could use dpkg::pre-install-pkgs. - Two specials are allowed, #include and #clear + Names for the configuration items are optional if a list is defined as it can be see in + the DPkg::Pre-Install-Pkgs example above. If you don't specify a name a + new entry will simply add a new option to the list. If you specify a name you can override + the option as every other option by reassigning a new value to the option. + + Two specials are allowed, #include (which is deprecated + and not supported by alternative implementations) and #clear: #include will include the given file, unless the filename ends in a slash, then the whole directory is included. #clear is used to erase a part of the configuration tree. The - specified element and all its descendents are erased. + specified element and all its descendants are erased. + (Note that these lines also need to end with a semicolon.) + + The #clear command is the only way to delete a list or a complete scope. + Reopening a scope or the ::-style described below will not + override previously written entries. Only options can be overridden by addressing a new + value to it - lists and scopes can't be overridden, only cleared. 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 name (APT::Get::Assume-Yes for instance) followed by an equals sign then the new value of the option. Lists can be appended too by adding - a trailing :: to the list name. + a trailing :: to the list name. (As you might suspect: The scope syntax can't be used + on the command line.) + + Note that you can use :: only for appending one item per line to a list and + that you should not use it in combination with the scope syntax. + (The scope syntax implicit insert ::) Using both syntaxes together will trigger a bug + which some users unfortunately relay on: An option with the unusual name "::" + which acts like every other option with a name. These introduces many problems + including that a user who writes multiple lines in this wrong syntax in + the hope to append to a list will gain the opposite as only the last assignment for this option + "::" will be used. Upcoming APT versions will raise errors and + will stop working if they encounter this misuse, so please correct such statements now + as long as APT doesn't complain explicit about them. The APT Group @@ -203,8 +232,9 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; standard form of http://[[user][:pass]@]host[:port]/. Per host proxies can also be specified by using the form http::Proxy::<host> with the special keyword DIRECT - meaning to use no proxies. The http_proxy environment variable - will override all settings. + meaning to use no proxies. If no one of the above settings is specified, + http_proxy environment variable + will be used. Three settings are provided for cache control with HTTP/1.1 compliant proxy caches. No-Cache tells the proxy to not use its cached @@ -225,7 +255,12 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; indicating how many outstanding requests APT should send. A value of zero MUST be specified if the remote host does not properly linger on TCP connections - otherwise data corruption will occur. Hosts which - require this are in violation of RFC 2068. + require this are in violation of RFC 2068. + + The used bandwidth can be limited with Acquire::http::Dl-Limit + which accepts integer values in kilobyte. The default value is 0 which deactivates + the limit and tries uses as much as possible of the bandwidth (Note that this option implicit + deactivates the download from multiple servers at the same time.) https @@ -252,9 +287,13 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; ftp - FTP URIs; ftp::Proxy is the default proxy server to use. It is in the - standard form of ftp://[[user][:pass]@]host[:port]/ and is - overridden by the ftp_proxy environment variable. To use a ftp + FTP URIs; ftp::Proxy is the default ftp proxy to use. It is in the + standard form of ftp://[[user][:pass]@]host[:port]/. Per + host proxies can also be specified by using the form + ftp::Proxy::<host> with the special keyword DIRECT + meaning to use no proxies. If no one of the above settings is specified, + ftp_proxy environment variable + will be used. To use a ftp proxy you will have to set the ftp::ProxyLogin script in the configuration file. This entry specifies the commands to send to tell the proxy server what to connect to. Please see @@ -292,7 +331,7 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; as specified in /etc/fstab. It is possible to provide alternate mount and unmount commands if your mount point cannot be listed in the fstab (such as an SMB mount and old mount packages). The syntax - is to put "/cdrom/"::Mount "foo"; within + is to put /cdrom/::Mount "foo"; within the cdrom block. It is important to have the trailing slash. Unmount commands can be specified using UMount. @@ -306,16 +345,30 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; CompressionTypes List of compression types which are understood by the acquire methods. Files like Packages can be available in various compression formats. - This list defines in which order the acquire methods will try to download these files. - Per default bzip2 compressed files will be prefered over - lzma, gzip and uncompressed files. The syntax for - the configuration fileentry (this option can't be set at runtime with the -o option) is + Per default the acquire methods can decompress bzip2, lzma + and gzip 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: Acquire::CompressionTypes::FileExtension "Methodname"; - e.g. Acquire::CompressionTypes::bz2 "bzip2"; - Note that at runtime the Dir::Bin::Methodname will + Also the Order 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. Acquire::CompressionTypes::Order:: "gz"; can + be used to prefer gzip compressed files over bzip2 and lzma. + If lzma should be preferred over gzip and bzip2 the + configure setting should look like this Acquire::CompressionTypes::Order { "lzma"; "gz"; }; + It is not needed to add bz2 explicit to the list as it will be added automatic. + Note that at run time the Dir::Bin::Methodname 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 Dir::Bin::bzip2 "/bin/bzip2"; - + the bzip2 method (the inbuilt) setting is Dir::Bin::bzip2 "/bin/bzip2"; + Note also that list entries specified on the command line 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. + 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. @@ -444,6 +497,87 @@ DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";}; the default is to disable signing and produce all binaries. + + dpkg trigger usage (and related options) + APT can call dpkg in a way so it can make aggressive use of triggers over + multiply calls of dpkg. Without further options dpkg will use triggers only in between his + own run. Activating these options can therefore decrease the time needed to perform the + install / upgrade. Note that it is intended to activate these options per default in the + future, but as it changes the way APT calling dpkg drastically it needs a lot more testing. + These options are therefore currently experimental and should not be used in + productive environments. Also it breaks the progress reporting so all frontends will + currently stay around half (or more) of the time in the 100% state while it actually configures + all packages. + Note that it is not guaranteed that APT will support these options or that these options will + not cause (big) trouble in the future. If you have understand the current risks and problems with + these options, but are brave enough to help testing them create a new configuration file and test a + combination of options. Please report any bugs, problems and improvements you encounter and make sure + to note which options you have used in your reports. Asking dpkg for help could also be useful for + debugging proposes, see e.g. dpkg --audit. A defensive option combination would be +DPkg::NoTriggers "true"; +PackageManager::Configure "smart"; +DPkg::ConfigurePending "true"; +DPkg::TriggersPending "true"; + + + DPkg::NoTriggers + Add the no triggers flag to all dpkg calls (expect the ConfigurePending call). + See &dpkg; if you are interested in what this actually means. In short: dpkg will not run the + triggers then this flag is present unless it is explicit called to do so in an extra call. + Note that this option exists (undocumented) also in older apt versions with a slightly different + meaning: Previously these option only append --no-triggers to the configure calls to dpkg - + now apt will add these flag also to the unpack and remove calls. + + PackageManager::Configure + Valid values are "all", "smart" and "no". + "all" is the default value and causes APT to configure all packages explicit. + The "smart" way is it to configure only packages which need to be configured before + another package can be unpacked (Pre-Depends) and let the rest configure by dpkg with a call generated + by the next option. "no" on the other hand will not configure anything and totally + relay on dpkg for configuration (which will at the moment fail if a Pre-Depends is encountered). + Setting this option to another than the all value will implicit activate also the next option per + default as otherwise the system could end in an unconfigured status which could be unbootable! + + + DPkg::ConfigurePending + If this option is set apt will call dpkg --configure --pending + to let dpkg handle all required configurations and triggers. This option is activated automatic + per default if the previous option is not set to all, but deactivating could be useful + if you want to run APT multiple times in a row - e.g. in an installer. In this sceneries you could + deactivate this option in all but the last run. + + DPkg::TriggersPending + Useful for smart configuration as a package which has pending + triggers is not considered as installed and dpkg treats them as unpacked + currently which is a dealbreaker for Pre-Dependencies (see debbugs #526774). Note that this will + process all triggers, not only the triggers needed to configure this package. + + PackageManager::UnpackAll + As the configuration can be deferred to be done at the end by dpkg it can be + tried to order the unpack series only by critical needs, e.g. by Pre-Depends. Default is true + and therefore the "old" method of ordering in various steps by everything. While both method + were present in earlier APT versions the OrderCritical method was unused, so + this method is very experimental and needs further improvements before becoming really useful. + + + OrderList::Score::Immediate + Essential packages (and there dependencies) should be configured immediately + after unpacking. It will be a good idea to do this quite early in the upgrade process as these + these configure calls require currently also DPkg::TriggersPending which + will run quite a few triggers (which maybe not needed). Essentials get per default a high score + but the immediate flag is relatively low (a package which has a Pre-Depends is higher rated). + These option and the others in the same group can be used to change the scoring. The following + example shows the settings with there default values. + OrderList::Score { + Delete 500; + Essential 200; + Immediate 10; + PreDepends 50; +}; + + + + @@ -838,15 +972,7 @@ is commented. Files - /etc/apt/apt.conf - APT configuration file. - Configuration Item: Dir::Etc::Main. - - - /etc/apt/apt.conf.d/ - APT configuration file fragments. - Configuration Item: Dir::Etc::Parts. - + &file-aptconf;