bitbake: bitbake: Set process names to be meaninful

This means that when you view the process tree, the processes
have meaningful names, aiding debugging:

$ pstree -p 30021
bash(30021)───KnottyUI(115579)───Cooker(115590)─┬─PRServ(115592)───{PRServ Handler}(115593)
                                                ├─Worker(115630)───bash:sleep(115631)───run.do_sleep.11(115633)───sleep(115634)
                                                └─{ProcessEQueue}(115591)

$ pstree -p 30021
bash(30021)───KnottyUI(117319)───Cooker(117330)─┬─Cooker(117335)
                                                ├─PRServ(117332)───{PRServ Handler}(117333)
                                                ├─Parser-1:2(117336)
                                                └─{ProcessEQueue}(117331)

Applies to parse threads, PR Server, cooker, the workers and execution
threads, working within the 16 character limit as best we can.

Needed to tweak the bitbake-worker magic values to tell the
workers apart.

(Bitbake rev: 539726a3b2202249a3f148d99e08909cb61902a5)

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

bitbake/bin/bitbake-worker

@@ -18,7 +18,7 @@ if len(sys.argv) != 2 or not sys.argv[1].startswith("decafbad"):
     sys.exit(1)
 
 profiling = False
-if sys.argv[1] == "decafbadbad":
+if sys.argv[1].startswith("decafbadbad"):
     profiling = True
     try:
         import cProfile as profile
@@ -202,6 +202,8 @@ def fork_off_task(cfg, data, workerdata, fn, task, taskname, appends, taskdepdat
                 the_data = bb.cache.Cache.loadDataFull(fn, appends, data)
                 the_data.setVar('BB_TASKHASH', workerdata["runq_hash"][task])
 
+                bb.utils.set_process_name("%s:%s" % (the_data.getVar("PN", True), taskname.replace("do_", "")))
+
                 # exported_vars() returns a generator which *cannot* be passed to os.environ.update() 
                 # successfully. We also need to unset anything from the environment which shouldn't be there 
                 exports = bb.data.exported_vars(the_data)
@@ -296,6 +298,10 @@ class BitbakeWorker(object):
         signal.signal(signal.SIGTERM, self.sigterm_exception)
         # Let SIGHUP exit as SIGTERM
         signal.signal(signal.SIGHUP, self.sigterm_exception)
+        if "beef" in sys.argv[1]:
+            bb.utils.set_process_name("Worker (Fakeroot)")
+        else:
+            bb.utils.set_process_name("Worker")
 
     def sigterm_exception(self, signum, stackframe):
         if signum == signal.SIGTERM: