diff --git a/bitbake/lib/bb/__init__.py b/bitbake/lib/bb/__init__.py
index 1f7946e..ac62d26 100644
--- a/bitbake/lib/bb/__init__.py
+++ b/bitbake/lib/bb/__init__.py
@@ -21,7 +21,7 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-__version__ = "1.27.1"
+__version__ = "1.28.0"
 
 import sys
 if sys.version_info < (2, 7, 3):
diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py
index 948c395..22428a6 100644
--- a/bitbake/lib/bb/build.py
+++ b/bitbake/lib/bb/build.py
@@ -413,6 +413,13 @@
         nice = int(nice) - curnice
         newnice = os.nice(nice)
         logger.debug(1, "Renice to %s " % newnice)
+    ionice = localdata.getVar("BB_TASK_IONICE_LEVEL", True)
+    if ionice:
+        try:
+            cls, prio = ionice.split(".", 1)
+            bb.utils.ioprio_set(os.getpid(), int(cls), int(prio))
+        except:
+            bb.warn("Invalid ionice level %s" % ionice)
 
     bb.utils.mkdirhier(tempdir)
 
diff --git a/bitbake/lib/bb/command.py b/bitbake/lib/bb/command.py
index 398c1d6..74106d1 100644
--- a/bitbake/lib/bb/command.py
+++ b/bitbake/lib/bb/command.py
@@ -181,6 +181,16 @@
         value = str(params[1])
         command.cooker.data.setVar(varname, value)
 
+    def getSetVariable(self, command, params):
+        """
+        Read the value of a variable from data and set it into the datastore
+        which effectively expands and locks the value.
+        """
+        varname = params[0]
+        result = self.getVariable(command, params)
+        command.cooker.data.setVar(varname, result)
+        return result
+
     def setConfig(self, command, params):
         """
         Set the value of variable in configuration
diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index a0d7d59..4df8881 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -255,6 +255,11 @@
         self.state = state.initial
         self.caches_array = []
 
+        # Need to preserve BB_CONSOLELOG over resets
+        consolelog = None
+        if hasattr(self, "data"):
+            consolelog = self.data.getVar("BB_CONSOLELOG", True)
+
         if CookerFeatures.BASEDATASTORE_TRACKING in self.featureset:
             self.enableDataTracking()
 
@@ -281,6 +286,8 @@
         self.data = self.databuilder.data
         self.data_hash = self.databuilder.data_hash
 
+        if consolelog:
+            self.data.setVar("BB_CONSOLELOG", consolelog)
 
         # we log all events to a file if so directed
         if self.configuration.writeeventlog:
@@ -531,6 +538,11 @@
         for o in options:
             if o in ['prefile', 'postfile']:
                 clean = False
+                server_val = getattr(self.configuration, "%s_server" % o)
+                if not options[o] and server_val:
+                    # restore value provided on server start
+                    setattr(self.configuration, o, server_val)
+                    continue
             setattr(self.configuration, o, options[o])
         for k in bb.utils.approved_variables():
             if k in environment and k not in self.configuration.env:
@@ -1391,10 +1403,28 @@
         build.reset_cache()
         self.buildSetVars()
 
+        # If we are told to do the None task then query the default task
+        if (task == None):
+            task = self.configuration.cmd
+
+        if not task.startswith("do_"):
+            task = "do_%s" % task
+
         taskdata, runlist, fulltargetlist = self.buildTaskData(targets, task, self.configuration.abort)
 
         buildname = self.data.getVar("BUILDNAME", False)
-        bb.event.fire(bb.event.BuildStarted(buildname, fulltargetlist), self.data)
+
+        # make targets to always look as <target>:do_<task>
+        ntargets = []
+        for target in fulltargetlist:
+            if ":" in target:
+                if ":do_" not in target:
+                    target = "%s:do_%s" % tuple(target.split(":", 1))
+            else:
+                target = "%s:%s" % (target, task)
+            ntargets.append(target)
+
+        bb.event.fire(bb.event.BuildStarted(buildname, ntargets), self.data)
 
         rq = bb.runqueue.RunQueue(self, self.data, self.recipecache, taskdata, runlist)
         if 'universe' in targets:
diff --git a/bitbake/lib/bb/cookerdata.py b/bitbake/lib/bb/cookerdata.py
index f19c283..671c0cb 100644
--- a/bitbake/lib/bb/cookerdata.py
+++ b/bitbake/lib/bb/cookerdata.py
@@ -63,9 +63,9 @@
             raise Exception("Unable to set configuration option 'cmd' on the server: %s" % error)
 
         if not self.options.pkgs_to_build:
-            bbpkgs, error = server.runCommand(["getVariable", "BBPKGS"])
+            bbpkgs, error = server.runCommand(["getVariable", "BBTARGETS"])
             if error:
-                raise Exception("Unable to get the value of BBPKGS from the server: %s" % error)
+                raise Exception("Unable to get the value of BBTARGETS from the server: %s" % error)
             if bbpkgs:
                 self.options.pkgs_to_build.extend(bbpkgs.split())
 
@@ -129,6 +129,8 @@
         self.extra_assume_provided = []
         self.prefile = []
         self.postfile = []
+        self.prefile_server = []
+        self.postfile_server = []
         self.debug = 0
         self.cmd = None
         self.abort = True
diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 288a1c8..a9c044b 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -955,7 +955,7 @@
                 origud.method.download(origud, ld)
                 if hasattr(origud.method,"build_mirror_data"):
                     origud.method.build_mirror_data(origud, ld)
-            return ud.localpath
+            return origud.localpath
         # Otherwise the result is a local file:// and we symlink to it
         if not os.path.exists(origud.localpath):
             if os.path.islink(origud.localpath):
diff --git a/bitbake/lib/bb/fetch2/hg.py b/bitbake/lib/bb/fetch2/hg.py
index bbb4ed9..3b743ff 100644
--- a/bitbake/lib/bb/fetch2/hg.py
+++ b/bitbake/lib/bb/fetch2/hg.py
@@ -28,6 +28,7 @@
 import sys
 import logging
 import bb
+import errno
 from bb import data
 from bb.fetch2 import FetchMethod
 from bb.fetch2 import FetchError
diff --git a/bitbake/lib/bb/fetch2/svn.py b/bitbake/lib/bb/fetch2/svn.py
index 1733c2b..8a29193 100644
--- a/bitbake/lib/bb/fetch2/svn.py
+++ b/bitbake/lib/bb/fetch2/svn.py
@@ -54,6 +54,11 @@
 
         ud.module = ud.parm["module"]
 
+        if not "path_spec" in ud.parm:
+            ud.path_spec = ud.module
+        else:
+            ud.path_spec = ud.parm["path_spec"]
+
         # Create paths to svn checkouts
         relpath = self._strip_leading_slashes(ud.path)
         ud.pkgdir = os.path.join(data.expand('${SVNDIR}', d), ud.host, relpath)
@@ -102,7 +107,7 @@
 
             if command == "fetch":
                 transportuser = ud.parm.get("transportuser", "")
-                svncmd = "%s co %s %s://%s%s/%s%s %s" % (ud.basecmd, " ".join(options), proto, transportuser, svnroot, ud.module, suffix, ud.module)
+                svncmd = "%s co %s %s://%s%s/%s%s %s" % (ud.basecmd, " ".join(options), proto, transportuser, svnroot, ud.module, suffix, ud.path_spec)
             elif command == "update":
                 svncmd = "%s update %s" % (ud.basecmd, " ".join(options))
             else:
@@ -149,7 +154,7 @@
 
         os.chdir(ud.pkgdir)
         # tar them up to a defined filename
-        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, ud.module), d, cleanup = [ud.localpath])
+        runfetchcmd("tar %s -czf %s %s" % (tar_flags, ud.localpath, ud.path_spec), d, cleanup = [ud.localpath])
 
     def clean(self, ud, d):
         """ Clean SVN specific files and dirs """
diff --git a/bitbake/lib/bb/main.py b/bitbake/lib/bb/main.py
index 8762f72..c8530fc 100755
--- a/bitbake/lib/bb/main.py
+++ b/bitbake/lib/bb/main.py
@@ -383,6 +383,13 @@
         # Collect the feature set for the UI
         featureset = getattr(ui_module, "featureSet", [])
 
+    if configParams.server_only:
+        for param in ('prefile', 'postfile'):
+            value = getattr(configParams, param)
+            if value:
+                setattr(configuration, "%s_server" % param, value)
+                param = "%s_server" % param
+
     if not configParams.remote_server:
         # we start a server with a given configuration
         server = start_server(servermodule, configParams, configuration, featureset)
diff --git a/bitbake/lib/bb/runqueue.py b/bitbake/lib/bb/runqueue.py
index 2b71eed..878028a 100644
--- a/bitbake/lib/bb/runqueue.py
+++ b/bitbake/lib/bb/runqueue.py
@@ -797,6 +797,15 @@
                         st = "do_%s" % st
                     invalidate_task(fn, st, True)
 
+        # Create and print to the logs a virtual/xxxx -> PN (fn) table
+        virtmap = taskData.get_providermap()
+        virtpnmap = {}
+        for v in virtmap:
+            virtpnmap[v] = self.dataCache.pkg_fn[virtmap[v]]
+            bb.debug(2, "%s resolved to: %s (%s)" % (v, virtpnmap[v], virtmap[v]))
+        if hasattr(bb.parse.siggen, "tasks_resolved"):
+            bb.parse.siggen.tasks_resolved(virtmap, virtpnmap, self.dataCache)
+
         # Iterate over the task list and call into the siggen code
         dealtwith = set()
         todeal = set(range(len(self.runq_fnid)))
diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index 2985272..0352e45 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -80,6 +80,7 @@
         self.taskdeps = {}
         self.runtaskdeps = {}
         self.file_checksum_values = {}
+        self.taints = {}
         self.gendeps = {}
         self.lookupcache = {}
         self.pkgnameextract = re.compile("(?P<fn>.*)\..*")
@@ -199,11 +200,14 @@
         if 'nostamp' in taskdep and task in taskdep['nostamp']:
             # Nostamp tasks need an implicit taint so that they force any dependent tasks to run
             import uuid
-            data = data + str(uuid.uuid4())
+            taint = str(uuid.uuid4())
+            data = data + taint
+            self.taints[k] = "nostamp:" + taint
 
         taint = self.read_taint(fn, task, dataCache.stamp[fn])
         if taint:
             data = data + taint
+            self.taints[k] = taint
             logger.warn("%s is tainted from a forced run" % k)
 
         h = hashlib.md5(data).hexdigest()
@@ -247,6 +251,10 @@
         if taint:
             data['taint'] = taint
 
+        if runtime and k in self.taints:
+            if 'nostamp:' in self.taints[k]:
+                data['taint'] = self.taints[k]
+
         fd, tmpfile = tempfile.mkstemp(dir=os.path.dirname(sigfile), prefix="sigtask.")
         try:
             with os.fdopen(fd, "wb") as stream:
diff --git a/bitbake/lib/bb/taskdata.py b/bitbake/lib/bb/taskdata.py
index 5fab704..4d12b33 100644
--- a/bitbake/lib/bb/taskdata.py
+++ b/bitbake/lib/bb/taskdata.py
@@ -612,6 +612,18 @@
                 break
         # self.dump_data()
 
+    def get_providermap(self):
+        virts = []
+        virtmap = {}
+
+        for name in self.build_names_index:
+            if name.startswith("virtual/"):
+                virts.append(name)
+        for v in virts:
+            if self.have_build_target(v):
+                virtmap[v] = self.fn_index[self.get_provider(v)[0]]
+        return virtmap
+
     def dump_data(self):
         """
         Dump some debug information on the internal data structures
diff --git a/bitbake/lib/bb/tests/utils.py b/bitbake/lib/bb/tests/utils.py
index 9171509..a035ccf 100644
--- a/bitbake/lib/bb/tests/utils.py
+++ b/bitbake/lib/bb/tests/utils.py
@@ -376,3 +376,206 @@
         (updated, newlines) = bb.utils.edit_metadata(self._origfile.splitlines(True), varlist, handle_var)
         self.assertTrue(updated, 'List should be updated but isn\'t')
         self.assertEqual(newlines, newfile5.splitlines(True))
+
+
+class EditBbLayersConf(unittest.TestCase):
+
+    def _test_bblayers_edit(self, before, after, add, remove, notadded, notremoved):
+        with tempfile.NamedTemporaryFile('w', delete=False) as tf:
+            tf.write(before)
+            tf.close()
+            try:
+                actual_notadded, actual_notremoved = bb.utils.edit_bblayers_conf(tf.name, add, remove)
+                with open(tf.name) as f:
+                    actual_after = f.readlines()
+                self.assertEqual(after.splitlines(True), actual_after)
+                self.assertEqual(notadded, actual_notadded)
+                self.assertEqual(notremoved, actual_notremoved)
+            finally:
+                os.remove(tf.name)
+
+
+    def test_bblayers_remove(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/subpath/layer3 \
+  /home/user/path/layer4 \
+  "
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/subpath/layer3 \
+  /home/user/path/layer4 \
+  "
+"""
+        self._test_bblayers_edit(before, after,
+                                 None,
+                                 '/home/user/path/layer2',
+                                 [],
+                                 [])
+
+
+    def test_bblayers_add(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/subpath/layer3 \
+  /home/user/path/layer4 \
+  "
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/subpath/layer3 \
+  /home/user/path/layer4 \
+  /other/path/to/layer5 \
+  "
+"""
+        self._test_bblayers_edit(before, after,
+                                 '/other/path/to/layer5/',
+                                 None,
+                                 [],
+                                 [])
+
+
+    def test_bblayers_add_remove(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/subpath/layer3 \
+  /home/user/path/layer4 \
+  "
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/layer4 \
+  /other/path/to/layer5 \
+  "
+"""
+        self._test_bblayers_edit(before, after,
+                                 ['/other/path/to/layer5', '/home/user/path/layer2/'], '/home/user/path/subpath/layer3/',
+                                 ['/home/user/path/layer2'],
+                                 [])
+
+
+    def test_bblayers_add_remove_home(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  ~/path/layer1 \
+  ~/path/layer2 \
+  ~/otherpath/layer3 \
+  ~/path/layer4 \
+  "
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS = " \
+  ~/path/layer2 \
+  ~/path/layer4 \
+  ~/path2/layer5 \
+  "
+"""
+        self._test_bblayers_edit(before, after,
+                                 [os.environ['HOME'] + '/path/layer4', '~/path2/layer5'],
+                                 [os.environ['HOME'] + '/otherpath/layer3', '~/path/layer1', '~/path/notinlist'],
+                                 [os.environ['HOME'] + '/path/layer4'],
+                                 ['~/path/notinlist'])
+
+
+    def test_bblayers_add_remove_plusequals(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS += " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  "
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS += " \
+  /home/user/path/layer2 \
+  /home/user/path/layer3 \
+  "
+"""
+        self._test_bblayers_edit(before, after,
+                                 '/home/user/path/layer3',
+                                 '/home/user/path/layer1',
+                                 [],
+                                 [])
+
+
+    def test_bblayers_add_remove_plusequals2(self):
+        before = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS += " \
+  /home/user/path/layer1 \
+  /home/user/path/layer2 \
+  /home/user/path/layer3 \
+  "
+BBLAYERS += "/home/user/path/layer4"
+BBLAYERS += "/home/user/path/layer5"
+"""
+        after = r"""
+# A comment
+
+BBPATH = "${TOPDIR}"
+BBFILES ?= ""
+BBLAYERS += " \
+  /home/user/path/layer2 \
+  /home/user/path/layer3 \
+  "
+BBLAYERS += "/home/user/path/layer5"
+BBLAYERS += "/home/user/otherpath/layer6"
+"""
+        self._test_bblayers_edit(before, after,
+                                 ['/home/user/otherpath/layer6', '/home/user/path/layer3'], ['/home/user/path/layer1', '/home/user/path/layer4', '/home/user/path/layer7'],
+                                 ['/home/user/path/layer3'],
+                                 ['/home/user/path/layer7'])
diff --git a/bitbake/lib/bb/tinfoil.py b/bitbake/lib/bb/tinfoil.py
index 1ea46d8..7aa653f 100644
--- a/bitbake/lib/bb/tinfoil.py
+++ b/bitbake/lib/bb/tinfoil.py
@@ -36,13 +36,13 @@
 
         # Set up logging
         self.logger = logging.getLogger('BitBake')
-        console = logging.StreamHandler(output)
-        bb.msg.addDefaultlogFilter(console)
+        self._log_hdlr = logging.StreamHandler(output)
+        bb.msg.addDefaultlogFilter(self._log_hdlr)
         format = bb.msg.BBLogFormatter("%(levelname)s: %(message)s")
         if output.isatty():
             format.enable_color()
-        console.setFormatter(format)
-        self.logger.addHandler(console)
+        self._log_hdlr.setFormatter(format)
+        self.logger.addHandler(self._log_hdlr)
 
         self.config = CookerConfiguration()
         configparams = TinfoilConfigParameters(parse_only=True)
@@ -88,6 +88,7 @@
         self.cooker.shutdown(force=True)
         self.cooker.post_serve()
         self.cooker.unlockBitbake()
+        self.logger.removeHandler(self._log_hdlr)
 
 class TinfoilConfigParameters(ConfigParameters):
 
diff --git a/bitbake/lib/bb/ui/buildinfohelper.py b/bitbake/lib/bb/ui/buildinfohelper.py
index 6e313fe..78f1e92 100644
--- a/bitbake/lib/bb/ui/buildinfohelper.py
+++ b/bitbake/lib/bb/ui/buildinfohelper.py
@@ -66,6 +66,7 @@
 
     def __init__(self):
         self.layer_version_objects = []
+        self.layer_version_built = []
         self.task_objects = {}
         self.recipe_objects = {}
 
@@ -94,8 +95,8 @@
 
         created = False
         if not key in vars(self)[dictname].keys():
-            vars(self)[dictname][key] = clazz.objects.create(**kwargs)
-            created = True
+            vars(self)[dictname][key], created = \
+                clazz.objects.get_or_create(**kwargs)
 
         return (vars(self)[dictname][key], created)
 
@@ -161,8 +162,6 @@
             build.bitbake_version=build_info['bitbake_version']
             build.save()
 
-            Target.objects.filter(build = build).delete()
-
         else:
             build = Build.objects.create(
                                     project = prj,
@@ -183,18 +182,26 @@
 
         return build
 
-    def create_target_objects(self, target_info):
-        assert 'build' in target_info
-        assert 'targets' in target_info
-
-        targets = []
-        for tgt_name in target_info['targets']:
-            tgt_object = Target.objects.create( build = target_info['build'],
-                                    target = tgt_name,
-                                    is_image = False,
-                                    )
-            targets.append(tgt_object)
-        return targets
+    @staticmethod
+    def get_or_create_targets(target_info):
+        result = []
+        for target in target_info['targets']:
+            task = ''
+            if ':' in target:
+                target, task = target.split(':', 1)
+            if task.startswith('do_'):
+                task = task[3:]
+            if task == 'build':
+                task = ''
+            obj, created = Target.objects.get_or_create(build=target_info['build'],
+                                                        target=target)
+            if created:
+                obj.is_image = False
+                if task:
+                    obj.task = task
+                obj.save()
+            result.append(obj)
+        return result
 
     def update_build_object(self, build, errors, warnings, taskfailures):
         assert isinstance(build,Build)
@@ -269,23 +276,66 @@
 
         assert not recipe_information['file_path'].startswith("/")      # we should have layer-relative paths at all times
 
-        recipe_object, created = self._cached_get_or_create(Recipe, layer_version=recipe_information['layer_version'],
+
+        def update_recipe_obj(recipe_object):
+            object_changed = False
+            for v in vars(recipe_object):
+                if v in recipe_information.keys():
+                    object_changed = True
+                    vars(recipe_object)[v] = recipe_information[v]
+
+            if object_changed:
+                recipe_object.save()
+
+        recipe, created = self._cached_get_or_create(Recipe, layer_version=recipe_information['layer_version'],
                                      file_path=recipe_information['file_path'], pathflags = recipe_information['pathflags'])
-        if created and must_exist:
-            raise NotExisting("Recipe object created when expected to exist", recipe_information)
 
-        object_changed = False
-        for v in vars(recipe_object):
-            if v in recipe_information.keys():
-                object_changed = True
-                vars(recipe_object)[v] = recipe_information[v]
+        update_recipe_obj(recipe)
 
-        if object_changed:
-            recipe_object.save()
+        built_recipe = None
+        # Create a copy of the recipe for historical puposes and update it
+        for built_layer in self.layer_version_built:
+            if built_layer.layer == recipe_information['layer_version'].layer:
+                built_recipe, c = self._cached_get_or_create(Recipe,
+                        layer_version=built_layer,
+                        file_path=recipe_information['file_path'],
+                        pathflags = recipe_information['pathflags'])
+                update_recipe_obj(built_recipe)
+                break
 
-        return recipe_object
+
+        # If we're in analysis mode then we are wholly responsible for the data
+        # and therefore we return the 'real' recipe rather than the build
+        # history copy of the recipe.
+        if  recipe_information['layer_version'].build is not None and \
+            recipe_information['layer_version'].build.project == \
+                Project.objects.get_default_project():
+            return recipe
+
+        return built_recipe
 
     def get_update_layer_version_object(self, build_obj, layer_obj, layer_version_information):
+        if isinstance(layer_obj, Layer_Version):
+            # We already found our layer version for this build so just
+            # update it with the new build information
+            logger.debug("We found our layer from toaster")
+            layer_obj.local_path = layer_version_information['local_path']
+            layer_obj.save()
+            self.layer_version_objects.append(layer_obj)
+
+            # create a new copy of this layer version as a snapshot for
+            # historical purposes
+            layer_copy, c = Layer_Version.objects.get_or_create(build=build_obj,
+                            layer=layer_obj.layer,
+                            commit=layer_version_information['commit'],
+                            local_path = layer_version_information['local_path'],
+                            )
+            logger.info("created new historical layer version %d", layer_copy.pk)
+
+            self.layer_version_built.append(layer_copy)
+
+            return layer_obj
+
         assert isinstance(build_obj, Build)
         assert isinstance(layer_obj, Layer)
         assert 'branch' in layer_version_information
@@ -293,14 +343,20 @@
         assert 'priority' in layer_version_information
         assert 'local_path' in layer_version_information
 
+        # If we're doing a command line build then associate this new layer with the
+        # project to avoid it 'contaminating' toaster data
+        project = None
+        if build_obj.project == Project.objects.get_default_project():
+            project = build_obj.project
+
         layer_version_object, _ = Layer_Version.objects.get_or_create(
-                                    build = build_obj,
-                                    layer = layer_obj,
-                                    branch = layer_version_information['branch'],
-                                    commit = layer_version_information['commit'],
-                                    priority = layer_version_information['priority'],
-                                    local_path = layer_version_information['local_path'],
-                                    )
+                                  build = build_obj,
+                                  layer = layer_obj,
+                                  branch = layer_version_information['branch'],
+                                  commit = layer_version_information['commit'],
+                                  priority = layer_version_information['priority'],
+                                  local_path = layer_version_information['local_path'],
+                                  project=project)
 
         self.layer_version_objects.append(layer_version_object)
 
@@ -335,8 +391,15 @@
                     localdirname = os.path.join(bc.be.sourcedir, localdirname)
                 #logger.debug(1, "Localdirname %s lcal_path %s" % (localdirname, layer_information['local_path']))
                 if localdirname.startswith(layer_information['local_path']):
+                  # If the build request came from toaster this field
+                  # should contain the information from the layer_version
+                  # That created this build request.
+                    if brl.layer_version:
+                        return brl.layer_version
+
                     # we matched the BRLayer, but we need the layer_version that generated this BR; reverse of the Project.schedule_build()
                     #logger.debug(1, "Matched %s to BRlayer %s" % (pformat(layer_information["local_path"]), localdirname))
+
                     for pl in buildrequest.project.projectlayer_set.filter(layercommit__layer__name = brl.name):
                         if pl.layercommit.layer.vcs_url == brl.giturl :
                             layer = pl.layercommit.layer
@@ -353,26 +416,29 @@
         files = filedata['files']
         syms = filedata['syms']
 
-        # we insert directories, ordered by name depth
+        # always create the root directory as a special case;
+        # note that this is never displayed, so the owner, group,
+        # size, permission are irrelevant
+        tf_obj = Target_File.objects.create(target = target_obj,
+                                            path = '/',
+                                            size = 0,
+                                            owner = '',
+                                            group = '',
+                                            permission = '',
+                                            inodetype = Target_File.ITYPE_DIRECTORY)
+        tf_obj.save()
+
+        # insert directories, ordered by name depth
         for d in sorted(dirs, key=lambda x:len(x[-1].split("/"))):
             (user, group, size) = d[1:4]
             permission = d[0][1:]
             path = d[4].lstrip(".")
+
+            # we already created the root directory, so ignore any
+            # entry for it
             if len(path) == 0:
-                # we create the root directory as a special case
-                path = "/"
-                tf_obj = Target_File.objects.create(
-                        target = target_obj,
-                        path = path,
-                        size = size,
-                        inodetype = Target_File.ITYPE_DIRECTORY,
-                        permission = permission,
-                        owner = user,
-                        group = group,
-                        )
-                tf_obj.directory = tf_obj
-                tf_obj.save()
                 continue
+
             parent_path = "/".join(path.split("/")[:len(path.split("/")) - 1])
             if len(parent_path) == 0:
                 parent_path = "/"
@@ -461,6 +527,12 @@
         errormsg = ""
         for p in packagedict:
             searchname = p
+            if p not in pkgpnmap:
+                logger.warning("Image packages list contains %p, but is"
+                               " missing from all packages list where the"
+                               " metadata comes from. Skipping...", p)
+                continue
+
             if 'OPKGN' in pkgpnmap[p].keys():
                 searchname = pkgpnmap[p]['OPKGN']
 
@@ -504,13 +576,20 @@
                 elif deptype == 'recommends':
                     tdeptype = Package_Dependency.TYPE_TRECOMMENDS
 
-                packagedeps_objs.append(Package_Dependency( package = packagedict[p]['object'],
-                                        depends_on = packagedict[px]['object'],
-                                        dep_type = tdeptype,
-                                        target = target_obj))
+                try:
+                    packagedeps_objs.append(Package_Dependency(
+                        package = packagedict[p]['object'],
+                        depends_on = packagedict[px]['object'],
+                        dep_type = tdeptype,
+                        target = target_obj))
+                except KeyError as e:
+                    logger.warn("Could not add dependency to the package %s "
+                                "because %s is an unknown package", p, px)
 
         if len(packagedeps_objs) > 0:
             Package_Dependency.objects.bulk_create(packagedeps_objs)
+        else:
+            logger.info("No package dependencies created")
 
         if len(errormsg) > 0:
             logger.warn("buildinfohelper: target_package_info could not identify recipes: \n%s", errormsg)
@@ -686,6 +765,7 @@
     def __init__(self, server, has_build_history = False):
         self.internal_state = {}
         self.internal_state['taskdata'] = {}
+        self.internal_state['targets'] = []
         self.task_order = 0
         self.autocommit_step = 1
         self.server = server
@@ -704,7 +784,7 @@
     ## methods to convert event/external info into objects that the ORM layer uses
 
 
-    def _get_build_information(self, consolelogfile):
+    def _get_build_information(self, build_log_path):
         build_info = {}
         # Generate an identifier for each new build
 
@@ -713,7 +793,7 @@
         build_info['distro_version'] = self.server.runCommand(["getVariable", "DISTRO_VERSION"])[0]
         build_info['started_on'] = timezone.now()
         build_info['completed_on'] = timezone.now()
-        build_info['cooker_log_path'] = consolelogfile
+        build_info['cooker_log_path'] = build_log_path
         build_info['build_name'] = self.server.runCommand(["getVariable", "BUILDNAME"])[0]
         build_info['bitbake_version'] = self.server.runCommand(["getVariable", "BB_VERSION"])[0]
 
@@ -764,8 +844,15 @@
                 if not localdirname.startswith("/"):
                     localdirname = os.path.join(bc.be.sourcedir, localdirname)
                 if path.startswith(localdirname):
+                    # If the build request came from toaster this field
+                    # should contain the information from the layer_version
+                    # That created this build request.
+                    if brl.layer_version:
+                        return brl.layer_version
+
                     #logger.warn("-- managed: matched path %s with layer %s " % (path, localdirname))
                     # we matched the BRLayer, but we need the layer_version that generated this br
+
                     for lvo in self.orm_wrapper.layer_version_objects:
                         if brl.name == lvo.layer.name:
                             return lvo
@@ -774,7 +861,7 @@
         logger.warn("Could not match layer version for recipe path %s : %s", path, self.orm_wrapper.layer_version_objects)
 
         #mockup the new layer
-        unknown_layer, _ = Layer.objects.get_or_create(name="__FIXME__unidentified_layer", layer_index_url="")
+        unknown_layer, _ = Layer.objects.get_or_create(name="Unidentified layer", layer_index_url="")
         unknown_layer_version_obj, _ = Layer_Version.objects.get_or_create(layer = unknown_layer, build = self.internal_state['build'])
 
         # append it so we don't run into this error again and again
@@ -847,9 +934,9 @@
                 logger.warn("buildinfohelper: cannot identify layer exception:%s ", nee)
 
 
-    def store_started_build(self, event, consolelogfile):
+    def store_started_build(self, event, build_log_path):
         assert '_pkgs' in vars(event)
-        build_information = self._get_build_information(consolelogfile)
+        build_information = self._get_build_information(build_log_path)
 
         build_obj = self.orm_wrapper.create_build_object(build_information, self.brbe, self.project)
 
@@ -869,7 +956,7 @@
         target_information['targets'] = event._pkgs
         target_information['build'] = build_obj
 
-        self.internal_state['targets'] = self.orm_wrapper.create_target_objects(target_information)
+        self.internal_state['targets'] = self.orm_wrapper.get_or_create_targets(target_information)
 
         # Save build configuration
         data = self.server.runCommand(["getAllKeysWithFlags", ["doc", "func"]])[0]
@@ -996,7 +1083,7 @@
             task_information['disk_io'] = taskstats['disk_io']
             if 'elapsed_time' in taskstats:
                 task_information['elapsed_time'] = taskstats['elapsed_time']
-            self.orm_wrapper.get_update_task_object(task_information, True)  # must exist
+            self.orm_wrapper.get_update_task_object(task_information)
 
     def update_and_store_task(self, event):
         assert 'taskfile' in vars(event)
@@ -1097,15 +1184,22 @@
         # for all image targets
         for target in self.internal_state['targets']:
             if target.is_image:
+                pkgdata = BuildInfoHelper._get_data_from_event(event)['pkgdata']
+                imgdata = BuildInfoHelper._get_data_from_event(event)['imgdata'][target.target]
+                filedata = BuildInfoHelper._get_data_from_event(event)['filedata'][target.target]
+
                 try:
-                    pkgdata = BuildInfoHelper._get_data_from_event(event)['pkgdata']
-                    imgdata = BuildInfoHelper._get_data_from_event(event)['imgdata'][target.target]
                     self.orm_wrapper.save_target_package_information(self.internal_state['build'], target, imgdata, pkgdata, self.internal_state['recipes'])
-                    filedata = BuildInfoHelper._get_data_from_event(event)['filedata'][target.target]
+                except KeyError as e:
+                    logger.warn("KeyError in save_target_package_information"
+                                "%s ", e)
+
+                try:
                     self.orm_wrapper.save_target_file_information(self.internal_state['build'], target, filedata)
-                except KeyError:
-                    # we must have not got the data for this image, nothing to save
-                    pass
+                except KeyError as e:
+                    logger.warn("KeyError in save_target_file_information"
+                                "%s ", e)
+
 
 
 
@@ -1306,7 +1400,9 @@
 
         log_information = {}
         log_information['build'] = self.internal_state['build']
-        if event.levelno == formatter.ERROR:
+        if event.levelno == formatter.CRITICAL:
+            log_information['level'] = LogMessage.CRITICAL
+        elif event.levelno == formatter.ERROR:
             log_information['level'] = LogMessage.ERROR
         elif event.levelno == formatter.WARNING:
             log_information['level'] = LogMessage.WARNING
@@ -1319,6 +1415,7 @@
         log_information['pathname'] = event.pathname
         log_information['lineno'] = event.lineno
         logger.info("Logging error 2: %s", log_information)
+
         self.orm_wrapper.create_logmessage(log_information)
 
     def close(self, errorcode):
diff --git a/bitbake/lib/bb/ui/knotty.py b/bitbake/lib/bb/ui/knotty.py
index 2bee242..90c3183 100644
--- a/bitbake/lib/bb/ui/knotty.py
+++ b/bitbake/lib/bb/ui/knotty.py
@@ -230,7 +230,7 @@
     if error:
         logger.error("Unable to get the value of BBINCLUDELOGS_LINES variable: %s" % error)
         raise BaseException(error)
-    consolelogfile, error = server.runCommand(["getVariable", "BB_CONSOLELOG"])
+    consolelogfile, error = server.runCommand(["getSetVariable", "BB_CONSOLELOG"])
     if error:
         logger.error("Unable to get the value of BB_CONSOLELOG variable: %s" % error)
         raise BaseException(error)
diff --git a/bitbake/lib/bb/ui/toasterui.py b/bitbake/lib/bb/ui/toasterui.py
index e0c278b..3d26150 100644
--- a/bitbake/lib/bb/ui/toasterui.py
+++ b/bitbake/lib/bb/ui/toasterui.py
@@ -21,6 +21,7 @@
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
 from __future__ import division
+import time
 import sys
 try:
     import bb
@@ -43,8 +44,6 @@
 logger = logging.getLogger("ToasterLogger")
 interactive = sys.stdout.isatty()
 
-
-
 def _log_settings_from_server(server):
     # Get values of variables which control our output
     includelogs, error = server.runCommand(["getVariable", "BBINCLUDELOGS"])
@@ -59,12 +58,56 @@
     if error:
         logger.error("Unable to get the value of BB_CONSOLELOG variable: %s", error)
         raise BaseException(error)
-    return includelogs, loglines, consolelogfile
+    return consolelogfile
 
+# create a log file for a single build and direct the logger at it;
+# log file name is timestamped to the millisecond (depending
+# on system clock accuracy) to ensure it doesn't overlap with
+# other log file names
+#
+# returns (log file, path to log file) for a build
+def _open_build_log(log_dir):
+    format_str = "%(levelname)s: %(message)s"
 
-def main(server, eventHandler, params ):
+    now = time.time()
+    now_ms = int((now - int(now)) * 1000)
+    time_str = time.strftime('build_%Y%m%d_%H%M%S', time.localtime(now))
+    log_file_name = time_str + ('.%d.log' % now_ms)
+    build_log_file_path = os.path.join(log_dir, log_file_name)
+
+    build_log = logging.FileHandler(build_log_file_path)
+
+    logformat = bb.msg.BBLogFormatter(format_str)
+    build_log.setFormatter(logformat)
+
+    bb.msg.addDefaultlogFilter(build_log)
+    logger.addHandler(build_log)
+
+    return (build_log, build_log_file_path)
+
+# stop logging to the build log if it exists
+def _close_build_log(build_log):
+    if build_log:
+        build_log.flush()
+        build_log.close()
+        logger.removeHandler(build_log)
+
+def main(server, eventHandler, params):
+    # set to a logging.FileHandler instance when a build starts;
+    # see _open_build_log()
+    build_log = None
+
+    # set to the log path when a build starts
+    build_log_file_path = None
+
     helper = uihelper.BBUIHelper()
 
+    # TODO don't use log output to determine when bitbake has started
+    #
+    # WARNING: this log handler cannot be removed, as localhostbecontroller
+    # relies on output in the toaster_ui.log file to determine whether
+    # the bitbake server has started, which only happens if
+    # this logger is setup here (see the TODO in the loop below)
     console = logging.StreamHandler(sys.stdout)
     format_str = "%(levelname)s: %(message)s"
     formatter = bb.msg.BBLogFormatter(format_str)
@@ -73,8 +116,6 @@
     logger.addHandler(console)
     logger.setLevel(logging.INFO)
 
-    _, _, consolelogfile = _log_settings_from_server(server)
-
     # verify and warn
     build_history_enabled = True
     inheritlist, _ = server.runCommand(["getVariable", "INHERIT"])
@@ -87,8 +128,9 @@
         logger.error("ToasterUI can only work in observer mode")
         return 1
 
-
+    # set to 1 when toasterui needs to shut down
     main.shutdown = 0
+
     interrupted = False
     return_value = 0
     errors = 0
@@ -98,25 +140,31 @@
 
     buildinfohelper = BuildInfoHelper(server, build_history_enabled)
 
-    if buildinfohelper.brbe is not None and consolelogfile:
-        # if we are under managed mode we have no other UI and we need to write our own file
-        bb.utils.mkdirhier(os.path.dirname(consolelogfile))
-        conlogformat = bb.msg.BBLogFormatter(format_str)
-        consolelog = logging.FileHandler(consolelogfile)
-        bb.msg.addDefaultlogFilter(consolelog)
-        consolelog.setFormatter(conlogformat)
-        logger.addHandler(consolelog)
-
+    # write our own log files into bitbake's log directory;
+    # we're only interested in the path to the parent directory of
+    # this file, as we're writing our own logs into the same directory
+    consolelogfile = _log_settings_from_server(server)
+    log_dir = os.path.dirname(consolelogfile)
+    bb.utils.mkdirhier(log_dir)
 
     while True:
         try:
             event = eventHandler.waitEvent(0.25)
             if first:
                 first = False
+
+                # TODO don't use log output to determine when bitbake has started
+                #
+                # this is the line localhostbecontroller needs to
+                # see in toaster_ui.log which it uses to decide whether
+                # the bitbake server has started...
                 logger.info("ToasterUI waiting for events")
 
             if event is None:
                 if main.shutdown > 0:
+                    # if shutting down, close any open build log first
+                    _close_build_log(build_log)
+
                     break
                 continue
 
@@ -125,19 +173,32 @@
             # pylint: disable=protected-access
             # the code will look into the protected variables of the event; no easy way around this
 
+            # we treat ParseStarted as the first event of toaster-triggered
+            # builds; that way we get the Build Configuration included in the log
+            # and any errors that occur before BuildStarted is fired
+            if isinstance(event, bb.event.ParseStarted):
+                if not (build_log and build_log_file_path):
+                    build_log, build_log_file_path = _open_build_log(log_dir)
+                continue
+
             if isinstance(event, bb.event.BuildStarted):
-                buildinfohelper.store_started_build(event, consolelogfile)
+                # command-line builds don't fire a ParseStarted event,
+                # so we have to start the log file for those on BuildStarted instead
+                if not (build_log and build_log_file_path):
+                    build_log, build_log_file_path = _open_build_log(log_dir)
+
+                buildinfohelper.store_started_build(event, build_log_file_path)
 
             if isinstance(event, (bb.build.TaskStarted, bb.build.TaskSucceeded, bb.build.TaskFailedSilent)):
                 buildinfohelper.update_and_store_task(event)
-                logger.warn("Logfile for task %s", event.logfile)
+                logger.info("Logfile for task %s", event.logfile)
                 continue
 
             if isinstance(event, bb.build.TaskBase):
                 logger.info(event._message)
 
             if isinstance(event, bb.event.LogExecTTY):
-                logger.warn(event.msg)
+                logger.info(event.msg)
                 continue
 
             if isinstance(event, logging.LogRecord):
@@ -145,10 +206,12 @@
                     event.levelno = formatter.ERROR
 
                 buildinfohelper.store_log_event(event)
+
                 if event.levelno >= formatter.ERROR:
                     errors = errors + 1
                 elif event.levelno == formatter.WARNING:
                     warnings = warnings + 1
+
                 # For "normal" logging conditions, don't show note logs from tasks
                 # but do show them if the user has changed the default log level to
                 # include verbose/debug messages
@@ -169,8 +232,6 @@
             # timing and error informations from the parsing phase in Toaster
             if isinstance(event, (bb.event.SanityCheckPassed, bb.event.SanityCheck)):
                 continue
-            if isinstance(event, bb.event.ParseStarted):
-                continue
             if isinstance(event, bb.event.ParseProgress):
                 continue
             if isinstance(event, bb.event.ParseCompleted):
@@ -246,6 +307,12 @@
                     errorcode = 1
                     logger.error("Command execution failed: %s", event.error)
 
+                # turn off logging to the current build log
+                _close_build_log(build_log)
+
+                # reset ready for next BuildStarted
+                build_log = None
+
                 # update the build info helper on BuildCompleted, not on CommandXXX
                 buildinfohelper.update_build_information(event, errors, warnings, taskfailures)
                 buildinfohelper.close(errorcode)
@@ -254,7 +321,6 @@
 
                 # we start a new build info
                 if buildinfohelper.brbe is not None:
-
                     logger.debug("ToasterUI under BuildEnvironment management - exiting after the build")
                     server.terminateServer()
                 else:
@@ -296,8 +362,9 @@
                 continue
 
             if isinstance(event, bb.cooker.CookerExit):
-                # exit when the server exits
-                break
+                # shutdown when bitbake server shuts down
+                main.shutdown = 1
+                continue
 
             # ignore
             if isinstance(event, (bb.event.BuildBase,
@@ -308,14 +375,15 @@
                                   bb.event.OperationProgress,
                                   bb.command.CommandFailed,
                                   bb.command.CommandExit,
-                                  bb.command.CommandCompleted)):
+                                  bb.command.CommandCompleted,
+                                  bb.event.ReachableStamps)):
                 continue
 
             if isinstance(event, bb.event.DepTreeGenerated):
                 buildinfohelper.store_dependency_information(event)
                 continue
 
-            logger.error("Unknown event: %s", event)
+            logger.warn("Unknown event: %s", event)
             return_value += 1
 
         except EnvironmentError as ioerror:
@@ -335,7 +403,7 @@
             if tb is not None:
                 curr = tb
                 while curr is not None:
-                    logger.warn("Error data dump %s\n%s\n" , traceback.format_tb(curr,1), pformat(curr.tb_frame.f_locals))
+                    logger.error("Error data dump %s\n%s\n" , traceback.format_tb(curr,1), pformat(curr.tb_frame.f_locals))
                     curr = curr.tb_next
 
             # save them to database, if possible; if it fails, we already logged to console.
@@ -347,9 +415,8 @@
             # make sure we return with an error
             return_value += 1
 
-    if interrupted:
-        if return_value == 0:
-            return_value += 1
+    if interrupted and return_value == 0:
+        return_value += 1
 
     logger.warn("Return value is %d", return_value)
     return return_value
diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index 91faa49..31ec2b7 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -1177,7 +1177,7 @@
             if not skip:
                 if checkspc:
                     checkspc = False
-                    if newlines[-1] == '\n' and line == '\n':
+                    if newlines and newlines[-1] == '\n' and line == '\n':
                         # Squash blank line if there are two consecutive blanks after a removal
                         continue
                 newlines.append(line)
@@ -1201,7 +1201,19 @@
 
 
 def edit_bblayers_conf(bblayers_conf, add, remove):
-    """Edit bblayers.conf, adding and/or removing layers"""
+    """Edit bblayers.conf, adding and/or removing layers
+    Parameters:
+        bblayers_conf: path to bblayers.conf file to edit
+        add: layer path (or list of layer paths) to add; None or empty
+            list to add nothing
+        remove: layer path (or list of layer paths) to remove; None or
+            empty list to remove nothing
+    Returns a tuple:
+        notadded: list of layers specified to be added but weren't
+            (because they were already in the list)
+        notremoved: list of layers that were specified to be removed
+            but weren't (because they weren't in the list)
+    """
 
     import fnmatch
 
@@ -1210,6 +1222,13 @@
             pth = pth[:-1]
         return pth
 
+    approved = bb.utils.approved_variables()
+    def canonicalise_path(pth):
+        pth = remove_trailing_sep(pth)
+        if 'HOME' in approved and '~' in pth:
+            pth = os.path.expanduser(pth)
+        return pth
+
     def layerlist_param(value):
         if not value:
             return []
@@ -1218,48 +1237,80 @@
         else:
             return [remove_trailing_sep(value)]
 
-    notadded = []
-    notremoved = []
-
     addlayers = layerlist_param(add)
     removelayers = layerlist_param(remove)
 
     # Need to use a list here because we can't set non-local variables from a callback in python 2.x
     bblayercalls = []
+    removed = []
+    plusequals = False
+    orig_bblayers = []
+
+    def handle_bblayers_firstpass(varname, origvalue, op, newlines):
+        bblayercalls.append(op)
+        if op == '=':
+            del orig_bblayers[:]
+        orig_bblayers.extend([canonicalise_path(x) for x in origvalue.split()])
+        return (origvalue, None, 2, False)
 
     def handle_bblayers(varname, origvalue, op, newlines):
-        bblayercalls.append(varname)
         updated = False
         bblayers = [remove_trailing_sep(x) for x in origvalue.split()]
         if removelayers:
             for removelayer in removelayers:
-                matched = False
                 for layer in bblayers:
-                    if fnmatch.fnmatch(layer, removelayer):
+                    if fnmatch.fnmatch(canonicalise_path(layer), canonicalise_path(removelayer)):
                         updated = True
-                        matched = True
                         bblayers.remove(layer)
+                        removed.append(removelayer)
                         break
-                if not matched:
-                    notremoved.append(removelayer)
-        if addlayers:
+        if addlayers and not plusequals:
             for addlayer in addlayers:
                 if addlayer not in bblayers:
                     updated = True
                     bblayers.append(addlayer)
-                else:
-                    notadded.append(addlayer)
+            del addlayers[:]
 
         if updated:
+            if op == '+=' and not bblayers:
+                bblayers = None
             return (bblayers, None, 2, False)
         else:
             return (origvalue, None, 2, False)
 
-    edit_metadata_file(bblayers_conf, ['BBLAYERS'], handle_bblayers)
+    with open(bblayers_conf, 'r') as f:
+        (_, newlines) = edit_metadata(f, ['BBLAYERS'], handle_bblayers_firstpass)
 
     if not bblayercalls:
         raise Exception('Unable to find BBLAYERS in %s' % bblayers_conf)
 
+    # Try to do the "smart" thing depending on how the user has laid out
+    # their bblayers.conf file
+    if bblayercalls.count('+=') > 1:
+        plusequals = True
+
+    removelayers_canon = [canonicalise_path(layer) for layer in removelayers]
+    notadded = []
+    for layer in addlayers:
+        layer_canon = canonicalise_path(layer)
+        if layer_canon in orig_bblayers and not layer_canon in removelayers_canon:
+            notadded.append(layer)
+    notadded_canon = [canonicalise_path(layer) for layer in notadded]
+    addlayers[:] = [layer for layer in addlayers if canonicalise_path(layer) not in notadded_canon]
+
+    (updated, newlines) = edit_metadata(newlines, ['BBLAYERS'], handle_bblayers)
+    if addlayers:
+        # Still need to add these
+        for addlayer in addlayers:
+            newlines.append('BBLAYERS += "%s"\n' % addlayer)
+        updated = True
+
+    if updated:
+        with open(bblayers_conf, 'w') as f:
+            f.writelines(newlines)
+
+    notremoved = list(set(removelayers) - set(removed))
+
     return (notadded, notremoved)
 
 
@@ -1310,3 +1361,27 @@
     result = cdll['libc.so.6'].prctl(PR_SET_PDEATHSIG, signum)
     if result != 0:
         raise PrCtlError('prctl failed with error code %s' % result)
+
+#
+# Manually call the ioprio syscall. We could depend on other libs like psutil
+# however this gets us enough of what we need to bitbake for now without the
+# dependency
+#
+_unamearch = os.uname()[4]
+IOPRIO_WHO_PROCESS = 1
+IOPRIO_CLASS_SHIFT = 13
+
+def ioprio_set(who, cls, value):
+    NR_ioprio_set = None
+    if _unamearch == "x86_64":
+      NR_ioprio_set = 251
+    elif _unamearch[0] == "i" and _unamearch[2:3] == "86":
+      NR_ioprio_set = 289
+
+    if NR_ioprio_set:
+        ioprio = value | (cls << IOPRIO_CLASS_SHIFT)
+        rc = cdll['libc.so.6'].syscall(NR_ioprio_set, IOPRIO_WHO_PROCESS, who, ioprio)
+        if rc != 0:
+            raise ValueError("Unable to set ioprio, syscall returned %s" % rc)
+    else:
+        bb.warn("Unable to set IO Prio for arch %s" % _unamearch)