#12055 NORM Not Tri: OFW should sanity-check size of .zd files before starting to write them

[Zarro Boogs per Child]

#12055: OFW should sanity-check size of .zd files before starting to write them
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 Reporter:  cjb                  |                 Owner:  Quozl        
     Type:  enhancement          |                Status:  new          
 Priority:  normal               |             Milestone:  Not Triaged  
Component:  ofw - open firmware  |               Version:  not specified
 Keywords:                       |           Next_action:  never set    
 Verified:  0                    |   Deployment_affected:               
Blockedby:                       |              Blocking:               
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 The failure mode I'm trying to protect against is the one where you only
 have a partial download of the file, and you only realize it after fs-
 update spends five minutes flashing and then says "Short read of zdata
 file" unexpectedly.  It would save time (and wondering about why it
 failed) for it to immediately tell you that there's no way the .zd file
 you've provided can be complete, instead of waiting until it runs out of
 data.

 We should store the ultimate file size in bytes in a header of the .zd
 file, and test it against the file size on disk before doing anything
 else.

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Ticket URL: <http://dev.laptop.org/ticket/12055>
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