[GHC] #5119: sync-all should have a resume option

[GHC]

#5119: sync-all should have a resume option
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    Reporter:  ezyang            |       Owner:              
        Type:  feature request   |      Status:  new         
    Priority:  normal            |   Component:  Build System
     Version:  7.1               |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
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 If sync-all is run with flags that can cause it to fail given some problem
 (--ff-only, --rebase, etc.) it would be convenient if the command fails on
 some repo for it to allow us to resume from that repo (so we don't have to
 wait for all the repos that we know are fine.) Something like writing out
 the last repo to a file which is read out when --resume is called.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5119>
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