[Testing] need a clarification about sugar V 0.82

[Mitch Bradley]

The software supplied with the XO consists of many components:

The "operating system" component is Linux

The distribution - which includes the operating system plus a collection 
of supporting libraries and other programs - is based on Fedora 9.

The "desktop" - the graphical style whereby a user interacts with the 
system to start and stop applications - is part of Sugar V0.82.  The 
term "window manager" is often used instead of "desktop".

Sugar also includes a collection of "activities".  Other systems usually 
use the work "applications" instead of "activities".

All of those components - operating system, distribution, Sugar desktop, 
and Sugar activities - are stored in a "file system" that keeps track of 
the individual pieces.  The file system consists of named "directories" 
(also known as "folders" in some systems) and individual named files.

A copy of the file system, with all the pieces in their appropriate 
places, is created on a "build machine".  A "snapshot" of that file 
system is then stored in the ".img" file

The "copy-nand" command reads the ".img" file and uses it to create a 
new copy of the file system on an XO machine's internal NAND FLASH.

The ".crc" file contains information that "copy-nand" uses to verify 
that the ".img" file does not contain errors.  Sometimes such errors 
occur during while downloading the .img file, and sometimes because of 
faults in USB sticks where the .img file is stored.

James Cameron wrote:
> On Mon, Mar 22, 2010 at 10:41:34AM +0530, Ruwan F'do wrote:
>   
>> As per my knowledge sugar V0.82 is OS of XO1.
>>     
>
> Almost correct.  Sugar is the desktop component of the operating system
> on XO-1.
>
>   
>> When we installing build 8.2.2 into XO1 we need .img file and .crc
>> file related to build version according to the installation guide. 
>>     
>
> Yes.  The installation process uses firmware program built into laptop
> to load the image file into the storage.
>
>   
>>   *  Is that .img file converted from the sugar V0.82?
>>     
>
> Almost correct.  The image file is prepared by OLPC software using many
> hundreds of components, among them is Sugar.
>
>   
>>   * What is the difference of sugar V0.82 and .img file?
>>     
>
> Difference is of format and inclusions.
>
> Sugar is not an operating system, it is a collection of programs that
> form a desktop user experience.  An underlying operating system is
> required.
>
> OLPC merges Fedora 9 and Sugar to create the .img file.
>
>