devtool related changes, part 2

index 5103073..0c77d72 100644
@@ -187,6 +187,12 @@ class SignatureGeneratorBasic(SignatureGenerator):
                 self.file_checksum_values[k][f] = cs
                 data = data + cs
 
+        taskdep = dataCache.task_deps[fn]
+        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 = self.read_taint(fn, task, dataCache.stamp[fn])
         if taint:
             data = data + taint

index d7c5067..f26349f 100644
@@ -915,3 +915,130 @@ def exec_flat_python_func(func, *args, **kwargs):
     comp = bb.utils.better_compile(code, '<string>', '<string>')
     bb.utils.better_exec(comp, context, code, '<string>')
     return context['retval']
+
+def edit_metadata_file(meta_file, variables, func):
+    """Edit a recipe or config file and modify one or more specified
+    variable values set in the file using a specified callback function.
+    The file is only written to if the value(s) actually change.
+    """
+    var_res = {}
+    for var in variables:
+        var_res[var] = re.compile(r'^%s[ \t]*[?=]+' % var)
+
+    updated = False
+    varset_start = ''
+    newlines = []
+    in_var = None
+    full_value = ''
+
+    def handle_var_end():
+        (newvalue, indent, minbreak) = func(in_var, full_value)
+        if newvalue != full_value:
+            if isinstance(newvalue, list):
+                intentspc = ' ' * indent
+                if minbreak:
+                    # First item on first line
+                    if len(newvalue) == 1:
+                        newlines.append('%s "%s"\n' % (varset_start, newvalue[0]))
+                    else:
+                        newlines.append('%s "%s\\\n' % (varset_start, newvalue[0]))
+                        for item in newvalue[1:]:
+                            newlines.append('%s%s \\\n' % (intentspc, item))
+                        newlines.append('%s"\n' % indentspc)
+                else:
+                    # No item on first line
+                    newlines.append('%s " \\\n' % varset_start)
+                    for item in newvalue:
+                        newlines.append('%s%s \\\n' % (intentspc, item))
+                    newlines.append('%s"\n' % intentspc)
+            else:
+                newlines.append('%s "%s"\n' % (varset_start, newvalue))
+            return True
+        return False
+
+    with open(meta_file, 'r') as f:
+        for line in f:
+            if in_var:
+                value = line.rstrip()
+                full_value += value[:-1]
+                if value.endswith('"') or value.endswith("'"):
+                    if handle_var_end():
+                        updated = True
+                    in_var = None
+            else:
+                matched = False
+                for (varname, var_re) in var_res.iteritems():
+                    if var_re.match(line):
+                        splitvalue = line.split('"', 1)
+                        varset_start = splitvalue[0].rstrip()
+                        value = splitvalue[1].rstrip()
+                        if value.endswith('\\'):
+                            value = value[:-1]
+                        full_value = value
+                        if value.endswith('"') or value.endswith("'"):
+                            if handle_var_end():
+                                updated = True
+                        else:
+                            in_var = varname
+                        matched = True
+                        break
+                if not matched:
+                    newlines.append(line)
+    if updated:
+        with open(meta_file, 'w') as f:
+            f.writelines(newlines)
+
+def edit_bblayers_conf(bblayers_conf, add, remove):
+    """Edit bblayers.conf, adding and/or removing layers"""
+
+    import fnmatch
+
+    def remove_trailing_sep(pth):
+        if pth and pth[-1] == os.sep:
+            pth = pth[:-1]
+        return pth
+
+    def layerlist_param(value):
+        if not value:
+            return []
+        elif isinstance(value, list):
+            return [remove_trailing_sep(x) for x in value]
+        else:
+            return [remove_trailing_sep(value)]
+
+    notadded = []
+    notremoved = []
+
+    addlayers = layerlist_param(add)
+    removelayers = layerlist_param(remove)
+
+    def handle_bblayers(varname, origvalue):
+        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):
+                        updated = True
+                        matched = True
+                        bblayers.remove(layer)
+                        break
+                if not matched:
+                    notremoved.append(removelayer)
+        if addlayers:
+            for addlayer in addlayers:
+                if addlayer not in bblayers:
+                    updated = True
+                    bblayers.append(addlayer)
+                else:
+                    notadded.append(addlayer)
+
+        if updated:
+            return (bblayers, 2, False)
+        else:
+            return (origvalue, 2, False)
+
+    edit_metadata_file(bblayers_conf, ['BBLAYERS'], handle_bblayers)
+    return (notadded, notremoved)
+

index 9964040..edb4d2f 100755
@@ -103,6 +103,60 @@ class Commands(cmd.Cmd):
             logger.plain("%s  %s  %d" % (layername.ljust(20), layerdir.ljust(40), layerpri))
 
 
+    def do_add_layer(self, dirname):
+        """Add a layer to bblayers.conf
+
+usage: add-layer <layerdir>
+"""
+        if not dirname:
+            sys.stderr.write("Please specify the layer directory to add\n")
+            return
+
+        layerdir = os.path.abspath(dirname)
+        if not os.path.exists(layerdir):
+            sys.stderr.write("Specified layer directory doesn't exist\n")
+            return
+
+        layer_conf = os.path.join(layerdir, 'conf', 'layer.conf')
+        if not os.path.exists(layer_conf):
+            sys.stderr.write("Specified layer directory doesn't contain a conf/layer.conf file\n")
+            return
+
+        bblayers_conf = os.path.join('conf', 'bblayers.conf')
+        if not os.path.exists(bblayers_conf):
+            sys.stderr.write("Unable to find bblayers.conf\n")
+            return
+
+        (notadded, _) = bb.utils.edit_bblayers_conf(bblayers_conf, layerdir, None)
+        if notadded:
+            for item in notadded:
+                sys.stderr.write("Specified layer %s not in BBLAYERS\n" % item)
+
+
+    def do_remove_layer(self, dirname):
+        """Remove a layer from bblayers.conf
+
+usage: remove-layer <layerdir>
+"""
+        if not dirname:
+            sys.stderr.write("Please specify the layer directory to remove\n")
+            return
+
+        bblayers_conf = os.path.join('conf', 'bblayers.conf')
+        if not os.path.exists(bblayers_conf):
+            sys.stderr.write("Unable to find bblayers.conf\n")
+            return
+
+        if dirname.startswith('*'):
+            layerdir = dirname
+        else:
+            layerdir = os.path.abspath(dirname)
+        (_, notremoved) = bb.utils.edit_bblayers_conf(bblayers_conf, None, layerdir)
+        if notremoved:
+            for item in notremoved:
+                sys.stderr.write("No layers matching %s found in BBLAYERS\n" % item)
+
+
     def version_str(self, pe, pv, pr = None):
         verstr = "%s" % pv
         if pr:

index 16fd4ad..0d9b85e 100644
@@ -1385,7 +1385,7 @@ class BBCooker:
                 raise bb.BBHandledException()
             self.show_appends_with_no_recipes()
             self.handlePrefProviders()
-            self.recipecache.bbfile_priority = self.collection.collection_priorities(self.recipecache.pkg_fn)
+            self.recipecache.bbfile_priority = self.collection.collection_priorities(self.recipecache.pkg_fn, self.data)
             self.state = state.running
             return None
 

@@ -1610,7 +1610,7 @@ class CookerCollectFiles(object):
                     filelist.append(filename)
         return filelist
 
-    def collection_priorities(self, pkgfns):
+    def collection_priorities(self, pkgfns, d):
 
         priorities = {}
 

@@ -1639,7 +1639,8 @@ class CookerCollectFiles(object):
 
         for collection, pattern, regex, _ in self.bbfile_config_priorities:
             if regex in unmatched:
-                collectlog.warn("No bb files matched BBFILE_PATTERN_%s '%s'" % (collection, pattern))
+                if d.getVar('BBFILE_PATTERN_IGNORE_EMPTY_%s' % collection, True) != '1':
+                    collectlog.warn("No bb files matched BBFILE_PATTERN_%s '%s'" % (collection, pattern))
 
         return priorities