[PATCH] runqueue.py: Add inter setscene task dependency handling

[PATCH] runqueue.py: Add inter setscene task dependency handling

[Richard Purdie]

This is being added to resolve setscene race issues where we do have
particular dependencies required between setscene tasks. This allows
specific dependencies to be specified. This allows us to fix the races
in sstate with the useradd class in OE-Core.

Any tasks being depended upon have their reverse dependencies cleared to
ensure we don't have circular references.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/runqueue.py b/bitbake/lib/bb/runqueue.py
index a4030b3..d477345 100644
--- a/bitbake/lib/bb/runqueue.py
+++ b/bitbake/lib/bb/runqueue.py
@@ -1473,6 +1473,29 @@ class RunQueueExecuteScenequeue(RunQueueExecute):
             elif len(sq_revdeps_new[task]) != 0:
                 bb.msg.fatal("RunQueue", "Something went badly wrong during scenequeue generation, aborting. Please report this problem.")
 
+        # Resolve setscene inter-task dependencies
+        # e.g. do_sometask_setscene[depends] = "targetname:do_someothertask_setscene"
+        # Note that anything explicitly depended upon will have its reverse dependencies removed to avoid circular dependencies
+        for task in self.rqdata.runq_setscene:
+                realid = self.rqdata.taskData.gettask_id(self.rqdata.taskData.fn_index[self.rqdata.runq_fnid[task]], self.rqdata.runq_task[task] + "_setscene", False)
+                idepends = self.rqdata.taskData.tasks_idepends[realid]
+                for (depid, idependtask) in idepends:
+                    bb.error("%s %s" % (depid, idependtask))
+                    if depid not in self.rqdata.taskData.build_targets:
+                        continue
+
+                    depdata = self.rqdata.taskData.build_targets[depid][0]
+                    if depdata is None:
+                         continue
+                    dep = self.rqdata.taskData.fn_index[depdata]
+                    taskid = self.rqdata.get_task_id(self.rqdata.taskData.getfn_id(dep), idependtask.replace("_setscene", ""))
+                    if taskid is None:
+                        bb.msg.fatal("RunQueue", "Task %s depends upon nonexistant task %s:%s" % (self.rqdata.taskData.tasks_name[realid], dep, idependtask))
+
+                    sq_revdeps_squash[self.rqdata.runq_setscene.index(task)].add(self.rqdata.runq_setscene.index(taskid))
+                    # Have to zero this to avoid circular dependencies
+                    sq_revdeps_squash[self.rqdata.runq_setscene.index(taskid)] = set()
+
         #for task in xrange(len(sq_revdeps_squash)):
         #    print "Task %s: %s.%s is %s " % (task, self.rqdata.taskData.fn_index[self.rqdata.runq_fnid[self.rqdata.runq_setscene[task]]], self.rqdata.runq_task[self.rqdata.runq_setscene[task]] + "_setscene", sq_revdeps_squash[task])