Dpkg::Deps(3perl) libdpkg-perl Dpkg::Deps(3perl)
NAME
Dpkg::Deps - parse and manipulate dependencies of Debian packages
DESCRIPTION
The Dpkg::Deps module provides classes implementing various types of
dependencies.
The most important function is deps_parse(), it turns a dependency line
in a set of Dpkg::Deps::{Simple,AND,OR,Union} objects depending on the
case.
FUNCTIONS
All the deps_* functions are exported by default.
deps_eval_implication($rel_p, $v_p, $rel_q, $v_q)
($rel_p, $v_p) and ($rel_q, $v_q) express two dependencies as
(relation, version). The relation variable can have the following
values that are exported by Dpkg::Version: REL_EQ, REL_LT, REL_LE,
REL_GT, REL_GT.
This functions returns 1 if the "p" dependency implies the "q"
dependency. It returns 0 if the "p" dependency implies that "q" is
not satisfied. It returns undef when there's no implication.
The $v_p and $v_q parameter should be Dpkg::Version objects.
$dep = deps_concat(@dep_list)
This function concatenates multiple dependency lines into a single
line, joining them with ", " if appropriate, and always returning a
valid string.
$dep = deps_parse($line, %options)
This function parses the dependency line and returns an object,
either a Dpkg::Deps::AND or a Dpkg::Deps::Union. Various options
can alter the behavior of that function.
use_arch (defaults to 1)
Take into account the architecture restriction part of the
dependencies. Set to 0 to completely ignore that information.
host_arch (defaults to the current architecture)
Define the host architecture. By default it uses
Dpkg::Arch::get_host_arch() to identify the proper
architecture.
build_arch (defaults to the current architecture)
Define the build architecture. By default it uses
Dpkg::Arch::get_build_arch() to identify the proper
architecture.
reduce_arch (defaults to 0)
If set to 1, ignore dependencies that do not concern the
current host architecture. This implicitly strips off the
architecture restriction list so that the resulting
dependencies are directly applicable to the current
architecture.
use_profiles (defaults to 1)
Take into account the profile restriction part of the
dependencies. Set to 0 to completely ignore that information.
build_profiles (defaults to no profile)
Define the active build profiles. By default no profile is
defined.
reduce_profiles (defaults to 0)
If set to 1, ignore dependencies that do not concern the
current build profile. This implicitly strips off the profile
restriction formula so that the resulting dependencies are
directly applicable to the current profiles.
reduce_restrictions (defaults to 0)
If set to 1, ignore dependencies that do not concern the
current set of restrictions. This implicitly strips off any
architecture restriction list or restriction formula so that
the resulting dependencies are directly applicable to the
current restriction. This currently implies "reduce_arch" and
"reduce_profiles", and overrides them if set.
union (defaults to 0)
If set to 1, returns a Dpkg::Deps::Union instead of a
Dpkg::Deps::AND. Use this when parsing non-dependency fields
like Conflicts.
virtual (defaults to 0)
If set to 1, allow only virtual package version relations, that
is none, or "=". This should be set whenever working with
Provides fields.
build_dep (defaults to 0)
If set to 1, allow build-dep only arch qualifiers, that is
":native". This should be set whenever working with build-
deps.
tests_dep (defaults to 0)
If set to 1, allow tests-specific package names in
dependencies, that is "@" and "@builddeps@" (since dpkg
1.18.7). This should be set whenever working with dependency
fields from debian/tests/control.
This option implicitly (and forcibly) enables "build_dep"
because test dependencies are based on build dependencies
(since dpkg 1.22.1).
$bool = deps_iterate($deps, $callback_func)
This function visits all elements of the dependency object, calling
the callback function for each element.
The callback function is expected to return true when everything is
fine, or false if something went wrong, in which case the iteration
will stop.
Return the same value as the callback function.
deps_compare($a, $b)
Implements a comparison operator between two dependency objects.
This function is mainly used to implement the sort() method.
CLASSES - Dpkg::Deps::*
There are several kind of dependencies. A Dpkg::Deps::Simple dependency
represents a single dependency statement (it relates to one package
only). Dpkg::Deps::Multiple dependencies are built on top of this
class and combine several dependencies in different manners.
Dpkg::Deps::AND represents the logical "AND" between dependencies while
Dpkg::Deps::OR represents the logical "OR". Dpkg::Deps::Multiple
objects can contain Dpkg::Deps::Simple object as well as other
Dpkg::Deps::Multiple objects.
In practice, the code is only meant to handle the realistic cases
which, given Debian's dependencies structure, imply those restrictions:
AND can contain Simple or OR objects, OR can only contain Simple
objects.
Dpkg::Deps::KnownFacts is a special class that is used while evaluating
dependencies and while trying to simplify them. It represents a set of
installed packages along with the virtual packages that they might
provide.
CHANGES
Version 1.07 (dpkg 1.20.0)
New option: Add virtual option to deps_parse().
Version 1.06 (dpkg 1.18.7; module version bumped on dpkg 1.18.24)
New option: Add tests_dep option to deps_parse().
Version 1.05 (dpkg 1.17.14)
New function: deps_iterate().
Version 1.04 (dpkg 1.17.10)
New options: Add use_profiles, build_profiles, reduce_profiles and
reduce_restrictions to deps_parse().
Version 1.03 (dpkg 1.17.0)
New option: Add build_arch option to deps_parse().
Version 1.02 (dpkg 1.17.0)
New function: deps_concat()
Version 1.01 (dpkg 1.16.1)
<Used to document changes to Dpkg::Deps::* modules before they were
split.>
Version 1.00 (dpkg 1.15.6)
Mark the module as public.
1.22.6 2025-09-18 Dpkg::Deps(3perl)
Generated by dwww version 1.16 on Tue Dec 16 17:05:15 CET 2025.