NAME¶
AptPkg::Cache - APT package cache interface
SYNOPSIS¶
use AptPkg::Cache;
DESCRIPTION¶
The AptPkg::Cache module provides an interface to
APT's package cache.
AptPkg::Cache¶
The AptPkg::Cache package implements the
APT pkgCacheFile class as a hash
reference (inherits from AptPkg::hash). The hash keys are the names of
packages in the cache, and the values are AptPkg::Cache::Package objects
(which in turn appear as hash references, see below).
Constructor
- new([LOCK])
- Instantiation of the object uses configuration from the
$AptPkg::Config::_config and $AptPkg::System::_system objects
(automatically initialised if not done explicitly).
The cache initialisation can be quite verbose--controlled by the value of
$_config->{quiet}, which is set to "2" (quiet) if the
$_config object is auto-initialised.
The cache directory is locked if LOCK is true.
It is important to note that the structure of the returned object contains
self-referential elements, so some care must be taken if attempting to
traverse it recursively.
Methods
- files
- Return a list of AptPkg::Cache::PkgFile objects describing the package
files.
- packages
- Return an AptPkg::PkgRecords object which may be used to retrieve
additional information about packages.
- get, exists, keys
- These methods are used to implement the hashref abstraction:
$obj->get($pack) and $obj->{$pack} are equivalent.
- is_multi_arch
- Cache is multi-arch enabled.
- native_arch
- Native architecture.
AptPkg::Cache::Package¶
Implements the
APT pkgCache::PkgIterator class as a hash reference.
Keys
- Name
- Section
- Arch
- Package name, section and architecture.
- FullName
- Fully qualified name, including architecture.
- ShortName
- The shortest unambiguous package name: the same as "Name" for
native packages, and "FullName" for non-native.
- SelectedState
- InstState
- CurrentState
- Package state from the status file.
SelectedState may be "Unknown", "Install",
"Hold", "DeInstall" or "Purge".
InstState may be "Ok", "ReInstReq", "HoldInst"
or "HoldReInstReq".
CurrentState may be "NotInstalled", "UnPacked",
"HalfConfigured", "HalfInstalled",
"ConfigFiles" or "Installed".
In a numeric context, SelectedState, InstState and CurrentState evaluate to
an AptPkg::State:: constant.
- VersionList
- A reference to an array of AptPkg::Cache::Version objects describing
available versions of the package.
- CurrentVer
- An AptPkg::Cache::Version object describing the currently installed
version (if any) of the package.
- RevDependsList
- A reference to an array of AptPkg::Cache::Depends objects describing
packages which depend upon the current package.
- ProvidesList
- For virtual packages, this is a reference to an array of
AptPkg::Cache::Provides objects describing packages which provide the
current package.
- Flags
- A comma separated list if flags: "Auto", "Essential"
or "Important".
In a numeric context, evaluates to a combination of AptPkg::Flag::
constants.
[Note: the only one of these you need worry about is "Essential",
which is set based on the package's header of the same name.
"Auto" seems to be used internally by APT, and
"Important" seems to only be set on the apt package.]
- Index
- Internal APT unique reference for the package record.
AptPkg::Cache::Version¶
Implements the
APT pkgCache::VerIterator class as a hash reference.
Keys
- VerStr
- Section
- Arch
- The package version, section and architecture.
- MultiArch
- Multi-arch state: "None", "All", "Foreign",
"Same", "Allowed", "AllForeign" or
"AllAllowed".
In a numeric context, evaluates to an AptPkg::Version:: constant.
- ParentPkg
- An AptPkg::Cache::Package objct describing the package providing this
version.
- DescriptionList
- A list of AptCache::Cache::Description objects describing the files which
descrie a package version. The list includes both Package files and
Translation files, which contain translated Description fields.
- TranslatedDescription
- An AptCache::Cache::Description object for the current locale, which will
generally be a Translation file.
- DependsList
- A reference to an array of AptPkg::Cache::Depends objects describing
packages which the current package depends upon.
- ProvidesList
- A reference to an array of AptPkg::Cache::Provides objects describing
virtual packages provided by this version.
- FileList
- A reference to an array of AptPkg::Cache::VerFile objects describing the
packages files which include the current version.
- Size
- The .deb file size, in bytes.
- InstalledSize
- The disk space used when installed, in bytes.
- Index
- Internal APT unique reference for the version record.
- Priority
- Package priority: "important", "required",
"standard", "optional" or "extra".
In a numeric context, evaluates to an AptPkg::VerPriority:: constant.
AptPkg::Cache::Depends¶
Implements the
APT pkgCache::DepIterator class as a hash reference.
Keys
- DepType
- Type of dependency: "Depends", "PreDepends",
"Suggests", "Recommends", "Conflicts",
"Replaces" or "Obsoletes".
In a numeric context, evaluates to an AptPkg::Dep:: constant.
- ParentPkg
- ParentVer
- AptPkg::Cache::Package and AptPkg::Cache::Version objects describing the
package declaring the dependency.
- TargetPkg
- AptPkg::Cache::Package object describing the depended package.
- TargetVer
- For versioned dependencies, TargetVer is a string giving the version of
the target package required.
- CompType
- CompTypeDeb
- CompType gives a normalised comparison operator (>, >=, etc)
describing the relationship to TargetVer ("" if none).
CompTypeDeb returns Debian-style operators (>> rather than >).
In a numeric context, both CompType and CompTypeDeb evaluate to an
AptPkg::Dep:: constant.
Alternative dependencies (Depends: a | b) are identified by all but the last
having the AptPkg::Dep::Or bit set in the numeric representation of
CompType (and CompTypeDeb).
- Index
- Internal APT unique reference for the dependency record.
AptPkg::Cache::Provides¶
Implements the
APT pkgCache::PrvIterator class as a hash reference.
Keys
- Name
- Name of virtual package.
- OwnerPkg
- OwnerVer
- AptPkg::Cache::Package and AptPkg::Cache::Version objects describing the
providing package.
- ProvideVersion
- Version of the virtual package. [Not currently supported by dpkg]
- Index
- Internal APT unique reference for the provides record.
AptPkg::Cache::VerFile¶
Implements the
APT pkgCache::VerFileIterator class as a hash reference.
Keys
- File
- An AptPkg::Cache::PkgFile object describing the packages file.
- Offset
- Size
- The byte offset and length of the entry in the file.
- Index
- Internal APT unique reference for the version file record.
AptPkg::Cache::PkgFile¶
Implements the
APT pkgCache::PkgFileIterator class as a hash reference.
Keys
- FileName
- Packages file path.
- IndexType
- File type: "Debian Package Index", "Debian dpkg status
file".
- Archive
- Component
- Version
- Origin
- Label
- Site
- Fields from the Release file.
- IsOk
- True if the cache is in sync with this file.
- Index
- Internal APT unique reference for the package file record.
AptPkg::Cache::DescFile¶
Implements the
APT pkgCache::DescFileIterator class as a hash reference.
Keys
- File
- An AptPkg::Cache::PkgFile object describing the packages file.
SEE ALSO¶
AptPkg::Config(3pm),
AptPkg::System(3pm),
AptPkg(3pm),
AptPkg::hash(3pm),
AptPkg::PkgRecords(3pm),
AptPkg::Policy(3pm).
AUTHOR¶
Brendan O'Dea <bod@debian.org>