bitbake: bitbake/lib: spawn server/worker using the current Python interpreter

The user may have invoked ./bin/bitbake using a different Python
interpreter than whatever python3 is on $PATH (for example, explicitly
using a different version).  However, as the server and workers are
spawned directly they'll use the hashbang and thus a different Python.

We also ensure that argv[0] is set to sys.executable instead of
'bitbake-server' or 'bitbake-worker', so that sys.executable is set to
the right value inside the child.  Without this the server won't be
able to start any workers.

(Bitbake rev: b44d5d2a53d3082c8ce94e09c0cf833e33e25aec)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -1324,6 +1324,8 @@ class RunQueue:
         if self.cooker.configuration.profile:
             magic = "decafbadbad"
         fakerootlogs = None
+
+        workerscript = os.path.realpath(os.path.dirname(__file__) + "/../../bin/bitbake-worker")
         if fakeroot:
             magic = magic + "beef"
             mcdata = self.cooker.databuilder.mcdata[mc]
@@ -1332,10 +1334,10 @@ class RunQueue:
             env = os.environ.copy()
             for key, value in (var.split('=') for var in fakerootenv):
                 env[key] = value
-            worker = subprocess.Popen(fakerootcmd + ["bitbake-worker", magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE, env=env)
+            worker = subprocess.Popen(fakerootcmd + [sys.executable, workerscript, magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE, env=env)
             fakerootlogs = self.rqdata.dataCaches[mc].fakerootlogs
         else:
-            worker = subprocess.Popen(["bitbake-worker", magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+            worker = subprocess.Popen([sys.executable, workerscript, magic], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
         bb.utils.nonblockingfd(worker.stdout)
         workerpipe = runQueuePipe(worker.stdout, None, self.cfgData, self, rqexec, fakerootlogs=fakerootlogs)