fedora-docs-l10n/packaging-guidelines/master/pages/WeakDependencies — Portuguese (Brazil) @ Fedora Weblate: Examples

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	Weak Dependencies Policy
	Introduction
	Weak dependencies are basically variants of the `+Requires:+` tag and are matched against (virtual) `+Provides:+` and package names using `+Epoch-Version-Release+` range comparisons, just like regular `+Requires:+`. They come in two strengths: "weak" and "hint" and two directions "forward" (analogous to `+Requires:+`) and "backwards" (which has no analog in the previous dependency system).
	\| \|Forward \|Backward \|Weak \|Recommends: \|Supplements: \|Hint \|Suggests: \|Enhances:
	Weak dependencies allow smaller minimal installations while keeping the default installation feature rich. They also allow packages to specify preferences for specific providers while maintaining the flexibility of virtual provides, for example, preferring ruby vs jruby or community-mysql vs mariadb.
	Weak dependencies
	Weak dependencies are by default treated similarly to regular `+Requires:+`. Matching packages are added to the dnf transaction. If adding the package would lead to an error dnf will by default ignore the dependency. This allows users to exclude packages that would be added by weak dependencies or remove them later. To skip installing weak dependencies, pass `--setopt=install_weak_deps=False` to `dnf`.
	As with regular dependencies, weak dependencies MUST be satisfiable within the official Fedora repositories.
	Weak dependencies may only be used in a package if the package still functions without the dependency present. It is acceptable, however, to create packages that have very limited functionality without adding any of its weak requirements. Weak dependencies should be used where possible to minimize the installation for reasonable use cases, especially for building virtual machines or containers that have a single purpose only and do not require the full feature set of the package.
	Typical use cases for weak dependencies are:
	Documentation
	Documentation viewers if missing them is handled gracefully
	Examples	Exemplos
	Plug-ins or add-ons
	Support for file formats
	Support for protocols
	...
	Hints
	Hints are by default ignored by dnf. They may be used by GUI tools to offer add-on packages that are not installed by default but might be useful in combination with the installed packages. The requirements of the main use cases of a package should not merely be referenced by hints but included by strong or weak dependencies.
	Package Preference
	dnf (or more precisely libsolv) will use weak dependencies and hints to decide which package to use if there is a choice between multiple equally valid packages. In these cases packages that are pointed at by dependencies from installed or to be installed packages are preferred. Note, that this does not alter the normal rules of dependency resolution. For example, weak dependencies cannot enforce a older version of a package to be chosen.
	If there are multiple (typically virtual) providers for a dependency the requiring package may add a Suggests: to provide a hint to the dependency resolver as to which option is preferred. `+Enhances:+` should only be used for the rare occasion when the main package and other providers agree that adding the hint to the required package is for some reason the cleaner solution.
	Real life example
	Package A: Requires: mysql
	Package mariadb: Provides: mysql
	Package community-mysql: Provides: mysql
	If you want to prefer mariadb over community-mysql -> add `+Suggests:+` `+mariadb+` to Package A.
	Forward vs Backward Dependencies

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farribeiro Marked for edit fedora-docs-l10n/packaging-guidelines master/pages/WeakDependencies Portuguese (Brazil)	English Examples Portuguese (Brazil) 0 characters edited Current translation Exemplos 4 years ago
farribeiro Suggestion accepted fedora-docs-l10n/packaging-guidelines master/pages/WeakDependencies Portuguese (Brazil)	English Examples Portuguese (Brazil) 8 characters edited Current translation Exemplos 4 years ago
farribeiro Contributor joined fedora-docs-l10n/packaging-guidelines master/pages/WeakDependencies Portuguese (Brazil)	Contributor joined 4 years ago
None Suggestion added fedora-docs-l10n/packaging-guidelines master/pages/WeakDependencies Portuguese (Brazil)	English Examples Portuguese (Brazil) 8 characters edited Current translation Exemplos 4 years ago

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