[Buildbot] #3289: only grab logfiles on failure

[Buildbot trac]

#3289: only grab logfiles on failure
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Reporter:  vlovich    |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  master     |   Keywords:
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 Sometimes logfiles can be big & grabbing them on success is not meaningful
 (i.e. you will only ever look at them for when something has gone wrong).
 In that case, it probably would be nice for the logfiles option in
 !ShellCommand to be able to specify {"only_on_complete", True/False} for
 limiting getting the logfile only until the download is complete (i.e. not
 followed live).  If this is handled by follow then we should make the
 documentation for follow more clear.

 Then there would also be an additional {"retrieve_if", callable} where
 callable takes in the current step & logfile name & returns whether or not
 it should be retrieved.

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Ticket URL: <http://trac.buildbot.net/ticket/3289>
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