bitbake: cooker/hashserv: Allow autostarting of a local hash server using BB_HASHSERVE

Its useful, particularly in the local developer model of usage, for
bitbake to start and stop a hash equivalence server on local port,
rather than relying on one being started by the user before the build.

The new BB_HASHSERVE variable supports this.

The database handling is moved internally into the hashserv code so that
different threads/processes can be used for the server without errors.

(Bitbake rev: a4fa8f1bd88995ae60e10430316fbed63d478587)

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

bitbake/lib/bb/cooker.py

@@ -31,6 +31,7 @@ import pyinotify
 import json
 import pickle
 import codecs
+import hashserv
 
 logger      = logging.getLogger("BitBake")
 collectlog  = logging.getLogger("BitBake.Collection")
@@ -230,6 +231,8 @@ class BBCooker:
         self.state = state.initial
 
         self.parser = None
+        self.hashserv = None
+        self.hashservport = None
 
         signal.signal(signal.SIGTERM, self.sigterm_exception)
         # Let SIGHUP exit as SIGTERM
@@ -368,6 +371,15 @@ class BBCooker:
 
         self.data.setVar('BB_CMDLINE', self.ui_cmdline)
 
+        if self.data.getVar("BB_HASHSERVE") == "localhost:0":
+            dbfile = (self.data.getVar("PERSISTENT_DIR") or self.data.getVar("CACHE")) + "/hashserv.db"
+            self.hashserv = hashserv.create_server(('localhost', 0), dbfile, '')
+            self.hashservport = "localhost:" + str(self.hashserv.server_port)
+            thread = threading.Thread(target=self.hashserv.serve_forever)
+            thread.daemon = True
+            thread.start()
+            self.data.setVar("BB_HASHSERVE", self.hashservport)
+
         #
         # Copy of the data store which has been expanded.
         # Used for firing events and accessing variables where expansion needs to be accounted for
@@ -1645,9 +1657,10 @@ class BBCooker:
 
     def post_serve(self):
         prserv.serv.auto_shutdown()
+        if self.hashserv:
+            self.hashserv.shutdown()
         bb.event.fire(CookerExit(), self.data)
 
-
     def shutdown(self, force = False):
         if force:
             self.state = state.forceshutdown