#1686 NORM First D: xo activity bundles should be autodetectable by magic

[Zarro Boogs per Child]

#1686: xo activity bundles should be autodetectable by magic
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  Reporter:  tomeu   |       Owner:  tomeu                 
      Type:  defect  |      Status:  new                   
  Priority:  normal  |   Milestone:  First Deployment, V1.0
 Component:  sugar   |     Version:                        
Resolution:          |    Keywords:                        
  Verified:  0       |  
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Changes (by danw):

 * cc: danw (added)

Comment:

 Doing this in exactly the way ODT does would be an incompatible change to
 the file format, because it requires the zip file to start with a file
 with a known name ("mimetype"), whereas sugar requires all files in a
 bundle to be inside a single directory, and it assumes that every bundle
 will use a different directory name. So we can't put "mimetype" at the top
 level, because that would make the bundle invalid, but we can't put it in
 the directory either, because then the magic string "mimetype" wouldn't
 occur at a fixed location.

 One possibility would be to make sugar more lenient in Trial-3 (eg, allow
 files outside the .activity dir, but don't extract them), and then update
 the format post-T3 to include the mimetype file (with the understanding
 that new activities then wouldn't work on pre-T3 machines).

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Ticket URL: <https://dev.laptop.org/ticket/1686#comment:3>
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