AptPkg::Policy(3pm) User Contributed Perl Documentation AptPkg::Policy(3pm)NAME
AptPkg::Policy - APT package version policy class
SYNOPSIS
use AptPkg::Policy;
DESCRIPTION
The AptPkg::Policy module provides an interface to APT's package version policy.
AptPkg::Policy
The AptPkg::Policy package implements the APT pkgPolicy class.
An instance of the AptPkg::Policy class may be fetched using the "policy" method from an AptPkg::Cache object.
The following methods are implemented:
priority(PKG|FILE)
Return the pin priority for the given PKG (AptPkg::Cache::Package) or FILE (AptPkg::Cache::PkgFile) object.
match(PKG)
Find the pinned version of PKG. Returns an AptPkg::Cache::Version object.
candidate(PKG)
Returns the installation candidate version for PKG.
SEE ALSO AptPkg::Cache(3pm), AptPkg(3pm).
AUTHOR
Brendan O'Dea <bod@debian.org>
perl v5.14.2 2012-03-16 AptPkg::Policy(3pm)
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AptPkg::Cache(3pm) User Contributed Perl Documentation AptPkg::Cache(3pm)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.
AptPkg::Cache::Package
Implements the APT pkgCache::PkgIterator class as a hash reference.
Keys
Name
Section
Package name and section.
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.
ParentPkg
An AptPkg::Cache::Package objct describing the package providing this version.
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.
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>
perl v5.14.2 2012-03-27 AptPkg::Cache(3pm)