Revision as of 12:13, 26 December 2019

Font Dependencies to Langpacks

Summary

There are font(:lang=...) auto-generated dependency for fonts packages. it is used as a dependency identifier to satisfy a certain language requirement. but this way didn't guarantee qualities because what fonts packages is going to be pulled in is unreliable.

So this proposes to replace it with langpacks instead, which has proper dependencies for fonts and improve the user experience around fonts with applications.

Owner

Name: Akira TAGOH
Email: tagoh@redhat.com
Release notes owner:

Current status

Targeted release: Fedora 32
Last updated: 2019-12-26
Tracker bug: <will be assigned by the Wrangler>

Detailed Description

The language based meta information about font dependency was introduced since Fedora 11. that was helpful to find out a font for missing glyphs through PackageKit and was useful for minority languages because we didn't have fonts packages for them so much. but the user experience wasn't that better under the certain condition.

Users can't predict what fonts will be installed. this may gives us worst result particularly when no fonts for the requested language is installed and/or is majority languages that has too many fonts such as English, because this logic doesn't guarantee the quality of fonts nor preferred fonts we expect to get installed by default. This random dependency sometimes introduces unexpected result too so that it's likely to happen that dependencies may be satisfied from external repositories. this may particularly be a problem when composing ISOs.

So this Changes proposal aims to improve the user experience around font dependencies by replacing it to Langpacks instead. Langpacks contains various dependencies to use for certain languages, including dependencies for default fonts. so it will resolves the above issues.

Benefit to Fedora

This proposal provides reliable, predictable, and consistencies in dependencies about fonts.

Scope

Proposal owners:
- Update fontconfig to drop font(:lang=...) from the alias of the formatter for %{=pkgkit}
- Add font(:lang=...) dependency to each langpacks-core-...

Other developers: N/A

Release engineering: #Releng issue number all of fonts packages must be rebuilt
- List of deliverables: N/A

Policies and guidelines: N/A

Trademark approval: N/A

Upgrade/compatibility impact

The extra but the better fonts packages may be installed after upgrading.

How To Test

N/A

User Experience

Not too much changes in the user experience. they may see better fonts for certain language when they need to install a set of fonts for certain language support through PackageKit.

Dependencies

fontconfig
langpacks

Contingency Plan

Contingency mechanism: (What to do? Who will do it?) Proposal owners will revert all of changes and rebuild all of fonts packages to add back deps
Contingency deadline: the beta freeze
Blocks release? No
Blocks product? N/A

Documentation

N/A

Release Notes

@@ Line 66: / Line 66: @@
 This random dependency sometimes introduces unexpected result too so that it's likely to happen that dependencies may be satisfied from external repositories. this may particularly be a problem when composing ISOs.
-So this Changes proposal aims to improve the user experience around font dependencies by replacing it by Langpacks instead. Langpacks contains various dependencies to use for certain languages, including dependencies for default fonts. so it will resolves the above issues.
+So this Changes proposal aims to improve the user experience around font dependencies by replacing it to Langpacks instead. Langpacks contains various dependencies to use for certain languages, including dependencies for default fonts. so it will resolves the above issues.
 <!-- Expand on the summary, if appropriate.  A couple sentences suffices to explain the goal, but the more details you can provide the better. -->
@@ Line 102: / Line 102: @@
 == Scope ==
 * Proposal owners:
-** Update fontpackages to drop `font(:lang=...)` dependency generator from script
+** Update fontconfig to drop `font(:lang=...)` from the alias of the formatter for `%{=pkgkit}`
-** Replace `font(:lang=...)` dependency with `langpacks-core-...` in packages
+** Add `font(:lang=...)` dependency to each `langpacks-core-...`
-** Update PackageKit to pull `langpacks-core-...` in instead of `font(:lang=...)`
 <!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
-* Other developers: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Other developers: N/A <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
-* Release engineering: [https://pagure.io/releng/issues #Releng issue number] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE AS WELL AS FOR SELF CONTAINED CHANGES -->
+* Release engineering: [https://pagure.io/releng/issues #Releng issue number] all of fonts packages must be rebuilt <!-- REQUIRED FOR SYSTEM WIDE AS WELL AS FOR SELF CONTAINED CHANGES -->
 <!-- Does this feature require coordination with release engineering (e.g. changes to installer image generation or update package delivery)?  Is a mass rebuild required?  include a link to the releng issue.
 The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing, and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
-** [[Fedora_Program_Management/ReleaseBlocking/Fedora{{FedoraVersionNumber|next}}|List of deliverables]]: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+** [[Fedora_Program_Management/ReleaseBlocking/Fedora{{FedoraVersionNumber|next}}|List of deliverables]]: N/A <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- Please check the list of Fedora release deliverables and list all the differences the feature brings -->
-* Policies and guidelines: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Policies and guidelines: N/A <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- Do the packaging guidelines or other documents need to be updated for this feature?  If so, does it need to happen before or after the implementation is done?  If a FPC ticket exists, add a link here. -->
-* Trademark approval: N/A (not needed for this Change)
+* Trademark approval: N/A
 <!-- If your Change may require trademark approval (for example, if it is a new Spin), file a ticket ( https://fedorahosted.org/council/ ) requesting trademark approval from the Fedora Council. This approval will be done via the Council's consensus-based process. -->
 == Upgrade/compatibility impact ==
+The extra but the better fonts packages may be installed after upgrading.
 <!-- What happens to systems that have had a previous versions of Fedora installed and are updated to the version containing this change? Will anything require manual configuration or data migration? Will any existing functionality be no longer supported? -->
 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == How To Test ==
@@ Line 143: / Line 142: @@
 . What are the expected results of those actions?
 -->
+N/A
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == User Experience ==
-Users will see better quality of rendering on applications if they had `font(:lang=...)` dependency and fonts packages randomly has ever been installed.
+Not too much changes in the user experience. they may see better fonts for certain language when they need to install a set of fonts for certain language support through PackageKit.
 <!-- If this change proposal is noticeable by users, how will their experiences change as a result?
@@ Line 162: / Line 159: @@
 == Dependencies ==
+* fontconfig
+* langpacks
 <!-- What other packages (RPMs) depend on this package?  Are there changes outside the developers' control on which completion of this change depends?  In other words, completion of another change owned by someone else and might cause you to not be able to finish on time or that you would need to coordinate?  Other upstream projects like the kernel (if this is not a kernel change)? -->
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == Contingency Plan ==
 <!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
-* Contingency mechanism: (What to do?  Who will do it?) N/A (not a System Wide Change)  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Contingency mechanism: (What to do?  Who will do it?) Proposal owners will revert all of changes and rebuild all of fonts packages to add back deps  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- When is the last time the contingency mechanism can be put in place?  This will typically be the beta freeze. -->
-* Contingency deadline: N/A (not a System Wide Change)  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Contingency deadline: the beta freeze  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- Does finishing this feature block the release, or can we ship with the feature in incomplete state? -->
-* Blocks release? N/A (not a System Wide Change), Yes/No <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Blocks release? No <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-* Blocks product? product <!-- Applicable for Changes that blocks specific product release/Fedora.next -->
+* Blocks product? N/A <!-- Applicable for Changes that blocks specific product release/Fedora.next -->
 == Documentation ==
@@ Line 181: / Line 177: @@
 <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
+N/A
 == Release Notes ==

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