[Bugs] #2152 UNSP: Registration fails if user name contains ":"

[Sugar Labs Bugs]

#2152: Registration fails if user name contains ":"
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    Reporter:  bernie                     |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:  dextrose                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 The schoolserver idmgr daemon passes the user name provided by Sugar
 directly to useradd to create new UNIX users.

 The character ":" isn't allowed in /etc/passwd and makes the registration
 fail (without providing a clear explanation given, this is another bug
 imho).

 For maximum version interoperability, I suggest *both* Sugar and the XS
 should convert illegal characters to "_".

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2152>
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