[tahoe-dev] [tahoe-lafs] #662: change "tahoe manifest" to not skip duplicates

[tahoe-lafs]

#662: change "tahoe manifest" to not skip duplicates
---------------------------+------------------------------------------------
 Reporter:  warner         |           Owner:           
     Type:  enhancement    |          Status:  new      
 Priority:  major          |       Milestone:  undecided
Component:  code-dirnodes  |         Version:  1.3.0    
 Keywords:                 |   Launchpad_bug:           
---------------------------+------------------------------------------------

Comment(by warner):

 Oh, I should mention that partly this is the result of changing
 goals/definitions of "tahoe manifest". Originally, it was intended purely
 as a set of verifycaps: the idea being that you'd compute your manifest
 and then hand it to a separate Verifier service, which would take
 responsibility for checking up on all of them. It was also the intention
 that a verifycap be usable as a repaircap, so the Verifier service could
 be a Verifier/Repairer service. In these cases, we don't care about
 duplicates: we just want the minimum-size set of verifycaps, and it
 doesn't matter what path or paths were used to store each one.

 Later, "tahoe manifest" acquired path information, because that made it
 easier to backtrack and find a parent directory for any object which was
 later found to have problems. About this same time, the definition of
 "manifest" started changing, and now we sort of think about is as a list
 of (path,cap) tuples.

 So maybe we need to be more clear about our definitions, and perhaps
 create a separate API for each one.

 Incidentally, the cycle handling code on the "list of (path,cap) tuples"
 API could respond to cycles by emitting a special marker: (type="cycle",
 cap), and maybe include otherpath= too. The program which is receiving the
 manifest could conceivably use this information to stitch together the
 cycle somehow.

-- 
Ticket URL: <http://allmydata.org/trac/tahoe/ticket/662#comment:1>
tahoe-lafs <http://allmydata.org>
secure decentralized file storage grid