diff --git a/meta/lib/oe/copy_buildsystem.py b/meta/lib/oe/copy_buildsystem.py
new file mode 100644
index 0000000..979578c
--- /dev/null
+++ b/meta/lib/oe/copy_buildsystem.py
@@ -0,0 +1,101 @@
+# This class should provide easy access to the different aspects of the
+# buildsystem such as layers, bitbake location, etc.
+import stat
+import shutil
+
+def _smart_copy(src, dest):
+    # smart_copy will choose the correct function depending on whether the
+    # source is a file or a directory.
+    mode = os.stat(src).st_mode
+    if stat.S_ISDIR(mode):
+        shutil.copytree(src, dest, symlinks=True)
+    else:
+        shutil.copyfile(src, dest)
+        shutil.copymode(src, dest)
+
+class BuildSystem(object):
+    def __init__(self, d):
+        self.d = d
+        self.layerdirs = d.getVar('BBLAYERS', True).split()
+
+    def copy_bitbake_and_layers(self, destdir):
+        # Copy in all metadata layers + bitbake (as repositories)
+        layers_copied = []
+        bb.utils.mkdirhier(destdir)
+        layers = list(self.layerdirs)
+
+        corebase = self.d.getVar('COREBASE', True)
+        layers.append(corebase)
+
+        corebase_files = self.d.getVar('COREBASE_FILES', True).split()
+        corebase_files = [corebase + '/' +x for x in corebase_files]
+        # Make sure bitbake goes in
+        bitbake_dir = bb.__file__.rsplit('/', 3)[0]
+        corebase_files.append(bitbake_dir)
+
+        for layer in layers:
+            layerconf = os.path.join(layer, 'conf', 'layer.conf')
+            if os.path.exists(layerconf):
+                with open(layerconf, 'r') as f:
+                    if f.readline().startswith("# ### workspace layer auto-generated by devtool ###"):
+                        bb.warn("Skipping local workspace layer %s" % layer)
+                        continue
+
+            # If the layer was already under corebase, leave it there
+            # since layers such as meta have issues when moved.
+            layerdestpath = destdir
+            if corebase == os.path.dirname(layer):
+                layerdestpath += '/' + os.path.basename(corebase)
+            layerdestpath += '/' + os.path.basename(layer)
+
+            layer_relative = os.path.relpath(layerdestpath,
+                                             destdir)
+            layers_copied.append(layer_relative)
+
+            # Treat corebase as special since it typically will contain
+            # build directories or other custom items.
+            if corebase == layer:
+                bb.utils.mkdirhier(layerdestpath)
+                for f in corebase_files:
+                    f_basename = os.path.basename(f)
+                    destname = os.path.join(layerdestpath, f_basename)
+                    _smart_copy(f, destname)
+            else:
+                if os.path.exists(layerdestpath):
+                    bb.note("Skipping layer %s, already handled" % layer)
+                else:
+                    _smart_copy(layer, layerdestpath)
+
+        return layers_copied
+
+def generate_locked_sigs(sigfile, d):
+    bb.utils.mkdirhier(os.path.dirname(sigfile))
+    depd = d.getVar('BB_TASKDEPDATA', True)
+    tasks = ['%s.%s' % (v[2], v[1]) for v in depd.itervalues()]
+    bb.parse.siggen.dump_lockedsigs(sigfile, tasks)
+
+def prune_lockedsigs(allowed_tasks, excluded_targets, lockedsigs, pruned_output):
+    with open(lockedsigs, 'r') as infile:
+        bb.utils.mkdirhier(os.path.dirname(pruned_output))
+        with open(pruned_output, 'w') as f:
+            invalue = False
+            for line in infile:
+                if invalue:
+                    if line.endswith('\\\n'):
+                        splitval = line.strip().split(':')
+                        if splitval[1] in allowed_tasks and not splitval[0] in excluded_targets:
+                            f.write(line)
+                    else:
+                        f.write(line)
+                        invalue = False
+                elif line.startswith('SIGGEN_LOCKEDSIGS'):
+                    invalue = True
+                    f.write(line)
+
+def create_locked_sstate_cache(lockedsigs, input_sstate_cache, output_sstate_cache, d, fixedlsbstring=""):
+    bb.note('Generating sstate-cache...')
+
+    bb.process.run("gen-lockedsig-cache %s %s %s" % (lockedsigs, input_sstate_cache, output_sstate_cache))
+    if fixedlsbstring:
+        os.rename(output_sstate_cache + '/' + d.getVar('NATIVELSBSTRING', True),
+        output_sstate_cache + '/' + fixedlsbstring)