#4951 NORM Update.: activity update.

[Zarro Boogs per Child]

#4951: activity update.
---------------------+------------------------------------------------------
  Reporter:  cscott  |       Owner:  cscott  
      Type:  defect  |      Status:  new     
  Priority:  normal  |   Milestone:  Update.2
 Component:  distro  |     Version:          
Resolution:          |    Keywords:          
  Verified:  0       |  
---------------------+------------------------------------------------------
Changes (by cscott):

 * cc: mstone, cjb, krstic (added)


Comment:

 For the record: the shared files mechanism is intended to allow activities
 to be completely self-contained, eliminating the need for dependencies.
 Each activity will include all the files it requires (for example, a
 complete java runtime if the activity is written in Java); if those pieces
 are not required on the target, they are never downloaded nor installed on
 disk.

 We maintain a list of file hashes installed on the system.  The 'contents'
 file inside the activity bundle allows us to detect which files are
 already present on the target, and the .zip file format allows us to use
 http byte range requests to download only the needed files from the .zip.

-- 
Ticket URL: <http://dev.laptop.org/ticket/4951#comment:1>
One Laptop Per Child <http://dev.laptop.org>
OLPC bug tracking system