[Bugs] #1258 UNSP: enhancement: support browsing HTML content within bundles instead of unzipping them

[SugarLabs Bugs]

#1258: enhancement: support browsing HTML content within bundles instead of
unzipping them
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    Reporter:  skierpage                  |          Owner:  erikos                     
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 Using the jar: protocol, Browse (or anything that uses XULRunner) can
 directly access files in a ZIP file.

 So instead of unpacking .xol files, just launch Browse and point it at the
 bundle in the datastore.
 jar:file:///path/to/datastore/UUID_of_XOL!/activity_start_path
 This saves a copy and on uncompressed file systems a lot of storage space.

 I've tried this on my XO-1 running 8.2 with several collections and the
 Help.xo activity; once Rainbow is disabled or permissions changed, it
 works fine, seemingly no content or performance issues.

 I think the way to do this the content developer may add a line in the
 bundle's .info file indicating do_not_unzip.  Then sugar-toolkit's
 contentbundle.py would notice this, not unzip during install, and
 fabricate a jar: URL to launch the content.

 Two caveats:
 1. Rainbow security disallows Browse access to ~/.sugar in OLPC releases.
 To workaround this, chmod .sugar or move /etc/olpc-security out of the
 way.
 2. Non-ASCII characters in the .xo filename or the filenames within it
 cause problems.

 I'll try it on a SoaS to see how it works in later Sugar.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1258>
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