[Buildbot] #2750: Git: fetch all branches before switching to the given revision, if branch=None

[Buildbot trac]

#2750: Git: fetch all branches before switching to the given revision, if
branch=None
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Reporter:  dustin       |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  0.9.+
 Version:  0.8.8        |  Resolution:
Keywords:  git          |
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Comment (by dustin):

 Maybe I misunderstand, but you can't instruct git to fetch a specific
 revision from a remote repository -- only to fetch some named revision
 (and its parents).

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Ticket URL: <http://trac.buildbot.net/ticket/2750#comment:3>
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