On Thu, Sep 16, 2021 at 3:18 PM Ben Cotton <bcotton(a)redhat.com> wrote:
> == Summary ==
> exclude_from_weak_autodetect enables autodetection of unmet weak
> dependencies (Recommends or Supplements) of installed packages and
> blocks installation of packages satisfying already unmet dependencies.
> In other words: When you don't have the recommended package installed,
> it won't be automatically installed with future upgrades of the
> recommending package.
> == Owner ==
> * Name: [[User:jmracek| Jaroslav Mracek]]
> * Email: jmracek(a)redhat.com
> == Detailed Description ==
> The feature is designed to prevent an install of removed weak
> dependencies from the system by users and to not install weak
> dependencies missing after system deployment. It will change the
> behavior of DNF, microdnf, and PackageKit. The feature will be
> backported to all Fedoras, but in default, the feature will be off.
> Additional information: https://bugzilla.redhat.com/show_bug.cgi?id=1699672
> The default value for exclude_from_weak_autodetect configuration can
> be overridden in `/etc/dnf/dnf.conf`
> == Feedback ==
> The feature was requested by [[User:Churchyard|Miro Hrončok]] and
> supported by many others: See
> more feedback.
> == Benefit to Fedora ==
> After the installation of a fresh system, the first upgrade will not
> install a lot of weak dependencies. Some of them were excluded from
> the kick-start installation set for good reasons (security, image
> size, minimal functional set, ...), but after the first update, all
> weak dependencies are installed, therefore some features of deployment
> simply disappear.
> == Scope ==
> * Proposal owners:
> ** The feature is ready in Pull Request -
> ** PRs only wait for a release of libsolv
> ** The Feature will be enabled in upstream as default, therefore from
> Fedora 36, we start to release libdnf without a revert patch of
> default in comparison to upstream.
> * Other developers: The change requires a new release of libsolv.
> * Release engineering:
> * Policies and guidelines: A packaging guideline should be added that
> discourages or forbids weak dependencies on fully versioned
> (sub)packages (see
> * Trademark approval: N/A (not needed for this Change)
> * Alignment with Objectives:
> == Upgrade/compatibility impact ==
> No manual changes will be required. After the libdnf update, this
> feature will be on by default.
> == How To Test ==
> 1. Install package without satisfied weak dependencies
> 2. Upgrade the upgrade. With exclude_from_weak_autodetect=true, it
> will not install weak dependencies of already installed packages. With
> exclude_from_weak_autodetect=false, weak dependencies will be
> installed during upgrades.
> == User Experience ==
> The change in default will help to keep some values for particular
> deployments (a minimal system will be still minimal without disabling
> weak dependencies).
> Users will be able to remove particular weak dependencies and they
> will be not installed on the first upgrade.
> In case when the feature will not work according to the user
> expectation it can be switched off in the dnf configuration file.
> == Dependencies ==
> libsolv - Required code changes are already in the libsolv upstream.
> We only wait for the next libsolv release.
> == Contingency Plan ==
> There are no external dependencies, therefore we can easily postpone
> the feature and the change of default behavior.
> * Contingency mechanism: (What to do? Who will do it?)
> * Contingency deadline: beta freeze
> * Blocks release? No
> == Documentation ==
> The feature will be documented in dnf man pages.
Woot! I'm looking forward to this feature!
I second that, I'm looking forward to this.
However, we probably need to adapt some stuff if this is enabled by
default, because some things have abused the current behavior.
For exmple, if I remember correctly, mozilla-openh264 / gstreamer
support for it are installed as weak dependencies with post-GA package