#11776 NORM 12.1.0: incomplete fs-update may leave laptop bootable

[Zarro Boogs per Child]

#11776: incomplete fs-update may leave laptop bootable
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 Reporter:  Quozl         |                 Owner:  Quozl                            
     Type:  defect        |                Status:  new                              
 Priority:  normal        |             Milestone:  12.1.0                           
Component:  build-system  |               Version:  Development build as of this date
 Keywords:                |           Next_action:  code                             
 Verified:  0             |   Deployment_affected:                                   
Blockedby:                |              Blocking:                                   
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 We have already fixed zhashfs to write the zero block last, which works
 well with laptops that have had nothing on their internal storage.

 However, if the internal storage already contains an identical partition
 map, it is not cleared, and so a partial fs-update can leave the laptop
 bootable to some extent.

 Proposed fix, olpc-os-builder:bin/zhashfs to write a zeroed zero block
 first.

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Ticket URL: <http://dev.laptop.org/ticket/11776>
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