Hello Andreas
I implemented your idea about handling the alternatives. The "second"
blend-gen-control is under the name sec-blend-gen-control. This script uses
only the blends_dependencies_alternatives table to gather the data needed
to generate the control/task-description files. Both ideas (yours and mine)
generate the identical results(except some cases, see later below). Your
idea sounded more complex in the beginning but I have to admit that at
last it provides a more solid handling of the alternatives than mine(also
it uses only one table ;-) ).
The alternatives seem to be handled correctly(in both implemented ways),
for example in debian-edu blend we have:
blend | task |
alternatives | component |
distribution | dependency
------------+---------------+---------------------------------------------------------------------------------------------+-----------+--------------+------------
debian-edu | desktop-other | gecko-mediaplayer | mozilla-mplayer |
kaffeine-mozilla | mozilla-plugin-vlc | totem-mozilla | main | debian
| d
>From here we have the alternatives : Depends :gecko-mediaplayer |
mozilla-mplayer | kaffeine-mozilla | mozilla-plugin-vlc | totem-mozilla
Let's take the case of debian-edu, testing release, amd64 :
Available packages: gecko-mediaplayer, mozilla-plugin-vlc, totem-mozilla
are (debian,main,amd64)
Missing packages: mozilla-mplayer(ubuntu,multiverse),
kaffeine-mozilla(debian, main but only available in "oldstable" release)
So the initial relation "gecko-mediaplayer | mozilla-mplayer |
kaffeine-mozilla | mozilla-plugin-vlc | totem-mozilla" is correctly split
as following into the control file:
Depends: gecko-mediaplayer | mozilla-plugin-vlc | totem-mozilla
Suggests: mozilla-mplayer | kaffeine-mozilla
For example in debian-med blend the generated control/task-description
files are identical. I also tested with debian-edu(which has a lot of
alternatives packages comparing to debian-med) where the task-description
files are identical BUT the control files are not. In the beginning I
thought it was a mistake in one of the two implementations of the code so I
made an investigation. The differences in the control files are not coming
from the code itself but from data differences between the
blends_dependencies and the blends_dependencies_alternatives tables.
Here I have a summary of these differences using as reference the diff of
debian-edu blend control files:
*note: the blend-gen-control uses the blend_dependencies table for taking
of all the packages and just uses the blend_dependencies_alternatives for
combining the existing single packages
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - -
1)
#exists
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%nfs-server%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='nfs-server';
blend-gen-contro: does not include nfs-server package in control file at all
sec-blend-gen-control: includes nfs-server in control file
2)
#exists
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%dpt-raidutil%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='dpt-raidutil';
#suggest packages
blend-gen-control: dpt-i2o-raidutils | raidutils
sec-blend-gen-control: dpt-i2o-raidutils | raidutils | dpt-raidutil
3)
#exists
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%cupsomatic-ppd%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='cupsomatic-ppd';
#both go from depends go to suggests because they do not exist in debian,
main etc
blend-gen-control: foomatic-filters-ppds
sec-blend-gen-control : foomatic-filters-ppds | cupsomatic-ppd
4)
#exists
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like
'%flashplugin-nonfree-pulse%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='flashplugin-nonfree-pulse';
blend-gen-control : libflashsupport
sec-blend-gen-control : flashplugin-nonfree-pulse | libflashsupport
5)
#exists:
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%keuklid | kgeo%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='keuklid';
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='kgeo';
blend-gen-control : kig
sec-blend-gen-control: kig | keuklid | kgeo
6)
#exist
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%sodipodi%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='sodipodi';
blend-gen-control : does not include sodipodi package in control file
sec-blend-gen-control : includes sodipodi package in control file
7)
#exist
select blend, task, alternatives, component, distribution, dependency from
blends_dependencies_alternatives where alternatives like '%gpsim-lded%';
#does not exist
select blend, task, package, component, distribution, dependency from
blends_dependencies where package='gpsim-lded';
blend-gen-control : gpsim-led
sec-blend-gen-control : gpsim-led | gpsim-lded
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - -
So except from the data differences of the two tables, both implementations
generated same results. Tomorrow I will make more final tests to make sure
that the alternatives are handled properly. By writing the code for both
ideas and see them in action I also vote for your idea
(sec-blend-gen-control).
Kind regards
Emmanouil
