[PATCH v3 2/3] bitbake: cooker: add a new function to retrieve task signatures

[Julien Stephan <jstephan@baylibre.com>]

adding a new command in cooker to compute and get task signatures

this commit also add the associated command and event needed to get the
signatures using tinfoil

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
---
 bitbake/lib/bb/command.py |  6 ++++++
 bitbake/lib/bb/cooker.py  | 16 ++++++++++++++++
 bitbake/lib/bb/event.py   |  8 ++++++++
 3 files changed, 30 insertions(+)

diff --git a/bitbake/lib/bb/command.py b/bitbake/lib/bb/command.py
index a355f56c60c..12202779ac0 100644
--- a/bitbake/lib/bb/command.py
+++ b/bitbake/lib/bb/command.py
@@ -776,3 +776,9 @@ class CommandsAsync:
         bb.event.fire(bb.event.FindSigInfoResult(res), command.cooker.databuilder.mcdata[mc])
         command.finishAsyncCommand()
     findSigInfo.needcache = False
+
+    def getTaskSignatures(self, command, params):
+        res = command.cooker.getTaskSignatures(params[0], params[1])
+        bb.event.fire(bb.event.GetTaskSignatureResult(res), command.cooker.data)
+        command.finishAsyncCommand()
+    getTaskSignatures.needcache = True
diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index 11c9fa2c40d..687cdde5e6d 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -1542,6 +1542,22 @@ class BBCooker:
 
         self.idleCallBackRegister(buildFileIdle, rq)
 
+    def getTaskSignatures(self, target, task):
+        sig = []
+
+        taskdata, runlist = self.buildTaskData(target, "do_build", self.configuration.halt)
+        rq = bb.runqueue.RunQueue(self, self.data, self.recipecaches, taskdata, runlist)
+        rq.rqdata.prepare()
+
+        for key in rq.rqdata.runtaskentries:
+            pn = bb.parse.siggen.tidtopn[key]
+            taskname = bb.runqueue.taskname_from_tid(key)
+            if pn in target:
+                if (task and taskname in task) or (not task):
+                    rq.rqdata.prepare_task_hash(key)
+                    sig.append([pn, taskname, rq.rqdata.get_task_unihash(key)])
+        return sig
+
     def buildTargets(self, targets, task):
         """
         Attempt to build the targets specified
diff --git a/bitbake/lib/bb/event.py b/bitbake/lib/bb/event.py
index 0d0e0a68aac..f8acacd80d1 100644
--- a/bitbake/lib/bb/event.py
+++ b/bitbake/lib/bb/event.py
@@ -857,6 +857,14 @@ class FindSigInfoResult(Event):
         Event.__init__(self)
         self.result = result
 
+class GetTaskSignatureResult(Event):
+    """
+    Event to return results from GetTaskSignatures command
+    """
+    def __init__(self, sig):
+        Event.__init__(self)
+        self.sig = sig
+
 class ParseError(Event):
     """
     Event to indicate parse failed
-- 
2.41.0