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some brainstorming on location in anaconda



Today I was looking at https://bugzilla.redhat.com/show_bug.cgi?id=624158;
part of that bug involved creating a locale mapping file in initscripts;
this seemed like a bad idea. When considering that, I thought of lang-table,
and wondered 'how could we get rid of that'. Some thinking later, and...

anaconda currently has multiple locale/location screens:

- language selection (custom anaconda)
- keyboard selection (from s-c-keyboard, but nothing else
  uses that)
- timezone selection (from s-c-date)

anaconda needs the following bits of localization info:

- locale/language
- timezone
- keyboard layout
- text font

anaconda uses the following data sources:

- tzdata
- lang-table (a custom anaconda file)

anaconda does *zero* autodetection.

The rest of this is driven by two assumptions:

1) We can do better.
2) We really shouldn't be driving off of configuration sources
that only live in anaconda.

...

Currently, we have the following data sources available to us:

 * iso-codes
 Includes:
 	country subdivisions (state/province), indexed by country
 	countries, and their country code
 	languages
 Does not map:
 	languages to countries
 
 * localedata
 Maps:
 	languages to countries (more or less)
 Does not map:
 	languages to a primary locale/country
 
 * tzdata
 Includes:
 	timezones, indexed by country
 	lat/lon for timezones
 Does not map:
 	locales to country
 	random cities to timezones (only specific timezone cities)
 
 * libgweather
 Includes:
 	many many cities, organized by country
 	- with timezone
 	- with lat/lon
 	- with weather codes
 Does not map
 	cities/contries to locale
 
 * geoclue
 Maps:
 	current location to:
 	- country
 	- city
 	- lat/lon
 
 * xkeyboard-config
 Maps:
 	language name to xkb layout (1:n, though)
 	country name to xkb layout

We also have the following widgetry:

 * system-config-date - timezone selector
 Uses: tzdata

 * system-config-keyboard - keyboard layout selector
 Uses: custom hardcoded mappings in the code, lang-table

 * system-config-language - language selector
 Uses: iso-codes

 * anaconda language selector - language selector
 Uses: lang-table

and the following other codebases that don't have widgetry split out:

 * gdm - language and keyboard selectors
 Uses: iso-codes, xkeyboard-config

 * gnome-control-center datetime - timezone selecor
 Uses: tzdata
 http://live.gnome.org/Design/SystemSettings/DateAndTime

 * gnome-panel - location selector
 Uses: libgweather, tzdata

and the following widgetry currently in development:

 * gnome locale configuration applet
 Uses: iso-codes, xkeyboard-config, and more
 http://live.gnome.org/Design/SystemSettings/RegionAndLanguage

A modest proposal...

On boot, as soon as there is networking available, start geoclue. Acquire
location information. Then, feed the information as so:

- country, lat/lon (from geoclue)
-> timezone (from country, lat/lon, via tzdata)
-> language (via ???????, see below)
 -> keyboard layout (from country/language combo, via xkeyboard-config)
 -> text font (hardcoded!)

Notes:
- What if we don't have network? Do DHCP always on link!
- It's easy to get a list of possible languages given the country. There's
  no canonical data source of what to use for the *primary* language,
  though. We could make a mapping table (ugh), or do heuristics (double ugh).
- text font is hardcoded to 'latarcyrheb-sun16'. We could conceivable have
  an override for the very few people who can't use that.

We then display as so:

...

Current settings:

 Location: United States         [ change ] [ details ]

If you click 'change', it pops up a selector dialog that either:

- allows you to enter a location (similar to the gnome panel clock code)
- allows you to click a location (similar to the control center timezone
  selector)

Either of those resets country, timezone, language, keyboard layout, etc.
If you select 'details', (or '>>>', or some expander, to be
language-neutral), you get:

 Language: English               [ change ]
 Country: USA                    [ change ]
 Time: 2:33 PM (US Eastern)      [ change ]
 Keyboard Layout: us             [ change ]

Then, each of those options pops up a single-purpose configuration dialog.
anaconda can either use the gnome capplet once it's done, or roll its own.

Thoughts?

Bill


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