#7523 NORM 8.2.0 (: library index regeneration fails due to no XDG_DATA_DIRS

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#7523: library index regeneration fails due to no XDG_DATA_DIRS
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 Reporter:  dsd     |         Owner:  marco                            
     Type:  defect  |        Status:  new                              
 Priority:  normal  |     Milestone:  8.2.0 (was Update.2)             
Component:  sugar   |       Version:  Development build as of this date
 Keywords:          |   Next_action:  never set                        
 Verified:  0       |     Blockedby:                                   
 Blocking:          |  
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 sugar-toolkit commit 7b485120a3 resulted in XDG_DATA_DIRS being used to
 launch /usr/share/library-common/make_index.py.

 XDG_DATA_DIRS is not set in the environment, both on 708 and joyride.
 Should we set it in e.g. /usr/bin/olpc-session, change sugar-toolkit, or
 what? i note that http://standards.freedesktop.org/basedir-spec/basedir-
 spec-0.5.html says:

 {{{
  If $XDG_DATA_DIRS is either not set or empty, a value equal to
 /usr/local/share/:/usr/share/ should be used.
 }}}

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Ticket URL: <http://dev.laptop.org/ticket/7523>
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