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Summary

Debian switched to installing recommends by default (the debian policy says they should be installed in all but the most unusual situations). We want to do the same for hardy.

Release Note

All package tools like apt, aptitude, synaptic will install packages marked as Recommends now (in addition to the ones marked as Depends).

This gives the user a more flexible package managmanet experience.

Rationale

Recommends are a powerful way of declaring that a dependency is strongly encouraged but not absolutely essential for the package to run. This makes our packaging more flexible.

Use Cases

Design

The recommends code is part of libapt now, the design of apt does not need to be modified.

Implementation

Apt needs to be changed so that it installs recommends-by-default. This is only a configuration change, no code changes are required. The code that allow installing recommends only for selected sections should go away as it is no longer required.

Synaptic should get a better user interface for recommends support, new filters "installed/not installed recommmends" should be added to the UI.

Gnome-app-install will install recommended packages by default because it follows apt here.

The adept code needs to be checked, its likely that it needs to be changed as well because it is quite different from the original apt code and reimplements a lot of interfaces.

UI Changes

The "mark changes" dialog in synpatic should get support for recommends.

Migration

If we enable recommends by default, we get ~20 new packages in the default ubuntu-desktop. The list can be checked via:

apt-get install --fix-policy --install-recommends -o Debug::pkgDepCache::AutoInstall=1

Colin will modify germinate so that it can generate a list of changes if we install recommends-by-default. The list needs to be reviewed and the packages fixed before the upload with recommends-by-default of apt is done.

A list of all packages with recommends will be generated for main, universe so that the MOTU team can have a look what makes sense and what does not. The list will looks like this:

gnopernicus: gnome-mag
...

We should consider making it easy for the user to get the missing recommends. A synaptic filter for "not installed recommends" should be added.

Test/Demo Plan

TBD

Opt-Out

Make sure it is possible and easy enough to opt out or ubuntu is likely to see more bugs like this one

Discussion

Q: Hardy has been released and this has not been implemented. Was there any further discussion of this at UDS Prague? Any plans for Intrepid? A package that I am interested will probably have to carry a Ubuntu specific change only due this issue. --Andrewsomething


CategorySpec

HardyRecommendsHandling (last edited 2008-08-06 16:21:21 by localhost)