bitbake: runqueue/event: Add an event for notifying of stale setscene tasks

Use the new functionality in build.py to identify stale setscene tasks
and send an event to the metadata listing them. The metadata then
has the option of performing cleanup operations if it thinks that
appropriate.

(Bitbake rev: ef8c980a3ae92c168b7ca16a4d19cd38a9574761)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/event.py

@@ -670,6 +670,17 @@ class ReachableStamps(Event):
         Event.__init__(self)
         self.stamps = stamps
 
+class StaleSetSceneTasks(Event):
+    """
+    An event listing setscene tasks which are 'stale' and will
+    be rerun. The metadata may use to clean up stale data.
+    tasks is a mapping of tasks and matching stale stamps.
+    """
+
+    def __init__(self, tasks):
+        Event.__init__(self)
+        self.tasks = tasks
+
 class FilesMatchingFound(Event):
     """
     Event when a list of files matching the supplied pattern has

bitbake/lib/bb/runqueue.py

@@ -2781,6 +2781,20 @@ def build_scenequeue_data(sqdata, rqdata, rq, cooker, stampcache, sqrq):
 
     update_scenequeue_data(sqdata.sq_revdeps, sqdata, rqdata, rq, cooker, stampcache, sqrq, summary=True)
 
+    # Compute a list of 'stale' sstate tasks where the current hash does not match the one
+    # in any stamp files. Pass the list out to metadata as an event.
+    found = {}
+    for tid in rqdata.runq_setscene_tids:
+        (mc, fn, taskname, taskfn) = split_tid_mcfn(tid)
+        stamps = bb.build.find_stale_stamps(taskname, rqdata.dataCaches[mc], taskfn)
+        if stamps:
+            if mc not in found:
+                found[mc] = {}
+            found[mc][tid] = stamps
+    for mc in found:
+        event = bb.event.StaleSetSceneTasks(found[mc])
+        bb.event.fire(event, cooker.databuilder.mcdata[mc])
+
 def update_scenequeue_data(tids, sqdata, rqdata, rq, cooker, stampcache, sqrq, summary=True):
 
     tocheck = set()