[Bugs] #3399 UNSP: sugar-jhbuild shell should change the prompt

[Sugar Labs Bugs]

#3399: sugar-jhbuild shell should change the prompt
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    Reporter:  manuq                      |          Owner:  sascha_silbe               
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 This will prevent confusions while working inside a Sugar shell.  The PS1
 variable should change to identify it.

 Proposal: prefixing PS1 with '(sugar)', like:

 {{{
 [humitos] [~/sugar]$ PS1=(sugar)$PS1
 (sugar)[humitos] [~/sugar]$
 }}}

 Besides, we should save the old PS1 to be able to restore it when the
 user closes the "sugar" session.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3399>
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