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debian-cd-clone/tasks/README.tasksel

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Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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This README explains how packages are added to full CDs and DVDs based
on tasks defined in tasksel.
Note that this document describes the default configuration for debian-cd.
Overview
========
One of the main factors deciding in what order packages are added,
especially for the first DVD and earlier CDs, is the definition of which
tasksel tasks should be used.
The list of packages to be added is generated dynamically at build time.
The procedure is somewhat complex and involves a number of (intermediate)
files.
The general sequence in which packages are added for "complete" images is:
1) Packages required by Debian Installer
2) Packages required to install the base system (debootstrap)
3) Any packages with priority "standard" or higher
4) Packages from tasksel tasks
a) Packages defined as "key" packages for primary tasksel tasks
b) Packages defined as "key" packages for language tasks (in the order:
'<language>', '<language>-desktop', '<language>-<desktop>-desktop');
only language desktop tasks that correspond to a primary task are
included
c) Regular packages from primary tasksel tasks
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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d) Regular packages from language tasks
e) Key packages from secondary tasksel tasks
f) Key packages from language tasks corresponding to secondary tasksel
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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tasks
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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g) Regular packages from secondary tasksel tasks
h) Regular packages from language tasks corresponding to secondary
tasksel tasks
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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5) Other packages in the order of their popularity (popcon score)
A tasksel task is defined as "secondary" by adding a '-' after its name
in a task.list file; other tasksel tasks are "primary".
Language tasks are added grouped per type, not per language. So with three
languages (A, B, C) and 'desktop' and 'gnome-desktop' as tasks you'll get:
A
B
C
A-desktop
B-desktop
C-desktop
A-gnome-desktop
B-gnome-desktop
C-gnome-desktop
Note that <language>-desktop tasks are always sorted before any
<language>-<desktop>-desktop tasks.
Files involved
==============
Static task files (can be found in tasks/codename):
Add suffix "generic" to default task files for naming consistency
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- Debian-generic or Debian-<desktop>:
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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top level task file; defines order of other task files to be used,
Add suffix "generic" to default task files for naming consistency
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including task-essential-[generic|<desktop>] and
task-full-[generic|<desktop>]
- task.list.generic or task.list.<desktop>:
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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tasksel tasks to be included
Dynamically generated task files created at build time (can be found in
the subdirectory tasks under the working directory for the build):
- task.languages
copy of the actual language list to be used to add language tasks
(see "Language list used at build time" below)
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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- task.gen.[generic|<desktop>].primary:
Add suffix "generic" to default task files for naming consistency
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contains primary tasks from task.list.[generic|<desktop>] followed by
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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corresponding language tasks
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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- task.gen.[generic|<desktop>].secondary:
contains secondary tasks from task.list.[generic|<desktop>] and
corresponding language tasks
Add suffix "generic" to default task files for naming consistency
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- task-essential-[generic|<desktop>]:
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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list of key packages based on task.gen.[generic|<desktop>].primary;
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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corresponds to 3a/3b from overview above
Add suffix "generic" to default task files for naming consistency
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- task-full-[generic|<desktop>]:
update_tasks: give priority to key packages for secondary tasks Even for secondary tasks it makes sense to include their Key packages before their regular packages.
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list of packages based on both task.gen.[generic|<desktop>].primary and
task.gen.[generic|<desktop>].secondary; corresponds to 3c-3h from overview
above
Split out languages supported by D-I and tasksel from task.list files * Instead of duplicating what language tasks should be included in each task.list.* file, let update_tasks add them dynamically at runtime from a single list of languages supported by tasksel and D-I. This also makes maintaining the lists a lot less painful. * Indicate which tasks are "secondary" by adding a "-" suffix in task.list.* files instead of hardcoding it in update_tasks.
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The generation of these files is done early in a build by the script
tools/update_tasks.