#3777 NORM Untriag: Sticky flag for boot trees.

[Zarro Boogs per Child]

#3777: Sticky flag for boot trees.
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 Reporter:  mstone       |       Owner:  jg       
     Type:  enhancement  |      Status:  new      
 Priority:  normal       |   Milestone:  Untriaged
Component:  distro       |     Version:           
 Keywords:               |    Verified:  0        
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 Currently, when you use the incremental upgrades described in #2517,
 Rainbow will delete all boot trees except for the one you're running from
 because it doesn't have any information about which ones to keep and
 because wants to be very sure that there will be enough space to download
 a new tree.

 However, a better policy would be to maintain a list of "sticky" trees
 that should not be automatically garbage-collected. Then it would be
 reasonable to use the updater to "prepare" a given XO with several boot
 images for different occasions: one for development, one for the latest
 image, and one for demos, for example.

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Ticket URL: <https://dev.laptop.org/ticket/3777>
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