bitbake: bitbake-worker: Allow shutdown/database flush of pseudo server at task exit

We have a problem where pseudo server processes exist after bitbake exits
and hold the pseudo database in memory. In a docker container, the processes
will be killed as the container is destroyed with no warning and no opportunity
to write the data to disk. This leads to permissions/inode corruptions and
data loss.

Send a shutdown message to pseudo which in new versions of pseudo will flush
the database, thereby fixing some of the issues people using docker containers
see.

(Bitbake rev: 7752c2c00245e91aeb17e22de484535190b18e5d)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit a07a971b40acd3eee12e203d2cfa3e49f56109f6)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-worker

@@ -16,6 +16,8 @@ import signal
 import pickle
 import traceback
 import queue
+import shlex
+import subprocess
 from multiprocessing import Lock
 from threading import Thread
 
@@ -145,6 +147,7 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
     # a fork() or exec*() activates PSEUDO...
 
     envbackup = {}
+    fakeroot = False
     fakeenv = {}
     umask = None
 
@@ -164,6 +167,7 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
 
     # We can't use the fakeroot environment in a dry run as it possibly hasn't been built
     if 'fakeroot' in taskdep and taskname in taskdep['fakeroot'] and not dry_run:
+        fakeroot = True
         envvars = (workerdata["fakerootenv"][fn] or "").split()
         for key, value in (var.split('=') for var in envvars):
             envbackup[key] = os.environ.get(key)
@@ -282,7 +286,11 @@ def fork_off_task(cfg, data, databuilder, workerdata, fn, task, taskname, taskha
             try:
                 if dry_run:
                     return 0
-                return bb.build.exec_task(fn, taskname, the_data, cfg.profile)
+                ret = bb.build.exec_task(fn, taskname, the_data, cfg.profile)
+                if fakeroot:
+                    fakerootcmd = shlex.split(the_data.getVar("FAKEROOTCMD"))
+                    subprocess.run(fakerootcmd + ['-S'], check=True, stdout=subprocess.PIPE)
+                return ret
             except:
                 os._exit(1)
         if not profiling: