[Buildbot-commits] [Buildbot] #1705: Provide a better way of working with resources utilized by builds

[Buildbot]

#1705: Provide a better way of working with resources utilized by builds
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Reporter:  ayust        |       Owner:       
    Type:  enhancement  |      Status:  new  
Priority:  major        |   Milestone:  0.8.+
 Version:  master       |    Keywords:       
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 Many build processes involve some kind of instantiated resources (web
 servers, ssh tunnels, mock databases, et cetera). Currently, Buildbot has
 no concept of these resources - starting/stopping them generally has to be
 accomplished by a pair of buildsteps, maybe with a build property or two
 so that the 'start' step can tell the 'stop' step what process it should
 target or the like. This also means that Buildbot has no good way to deal
 with resources that could be shared between multiple builders, because
 each builder's steps have no way of knowing if they should shut the
 resource down when they're done with it or not.

 Thus, the idea: create a concept of resources in Buildbot. Builds could
 request that a resource be available, and either an existing resource
 would be used, or the resource would start itself up and pass any
 necessary information back to the build.

  * Resources could potentially be shared, shutting themselves down when
 the # of builds using them goes to 0 (or some other condition is met)
  * Because resources would be in charge of shutting themselves down,
 there'd be less case of forgetting a 'alwaysRun' and leaving zombie
 services running after failed builds
  * Less reliance on build properties for resource state
  * Easier to work with for resources that aren't already daemonized
 (resources could signal buildbot that they're "ready" without having to
 wait for a process like start-stop-daemon to exit, and just keep the
 resource open in a subprocess).

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Ticket URL: <http://buildbot.net/trac/ticket/1705>
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