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diff --git a/meta/classes/devtool-source.bbclass b/meta/classes/devtool-source.bbclass
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+++ b/meta/classes/devtool-source.bbclass
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+# Development tool - source extraction helper class
+#
+# NOTE: this class is intended for use by devtool and should not be
+# inherited manually.
+#
+# Copyright (C) 2014-2017 Intel Corporation
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+DEVTOOL_TEMPDIR ?= ""
+DEVTOOL_PATCH_SRCDIR = "${DEVTOOL_TEMPDIR}/patchworkdir"
+
+
+python() {
+    tempdir = d.getVar('DEVTOOL_TEMPDIR')
+
+    if not tempdir:
+        bb.fatal('devtool-source class is for internal use by devtool only')
+
+    # Make a subdir so we guard against WORKDIR==S
+    workdir = os.path.join(tempdir, 'workdir')
+    d.setVar('WORKDIR', workdir)
+    if not d.getVar('S').startswith(workdir):
+        # Usually a shared workdir recipe (kernel, gcc)
+        # Try to set a reasonable default
+        if bb.data.inherits_class('kernel', d):
+            d.setVar('S', '${WORKDIR}/source')
+        else:
+            d.setVar('S', '${WORKDIR}/%s' % os.path.basename(d.getVar('S')))
+    if bb.data.inherits_class('kernel', d):
+        # We don't want to move the source to STAGING_KERNEL_DIR here
+        d.setVar('STAGING_KERNEL_DIR', '${S}')
+
+    d.setVar('STAMPS_DIR', os.path.join(tempdir, 'stamps'))
+    d.setVar('T', os.path.join(tempdir, 'temp'))
+
+    # Hook in pre/postfuncs
+    is_kernel_yocto = bb.data.inherits_class('kernel-yocto', d)
+    if is_kernel_yocto:
+        unpacktask = 'do_kernel_checkout'
+        d.appendVarFlag('do_configure', 'postfuncs', ' devtool_post_configure')
+    else:
+        unpacktask = 'do_unpack'
+    d.appendVarFlag(unpacktask, 'postfuncs', ' devtool_post_unpack')
+    d.prependVarFlag('do_patch', 'prefuncs', ' devtool_pre_patch')
+    d.appendVarFlag('do_patch', 'postfuncs', ' devtool_post_patch')
+
+    # NOTE: in order for the patch stuff to be fully functional,
+    # PATCHTOOL and PATCH_COMMIT_FUNCTIONS need to be set; we can't
+    # do that here because we can't guarantee the order of the anonymous
+    # functions, so it gets done in the bbappend we create.
+}
+
+
+python devtool_post_unpack() {
+    import oe.recipeutils
+    import shutil
+    sys.path.insert(0, os.path.join(d.getVar('COREBASE'), 'scripts', 'lib'))
+    import scriptutils
+    from devtool import setup_git_repo
+
+    tempdir = d.getVar('DEVTOOL_TEMPDIR')
+    workdir = d.getVar('WORKDIR')
+    srcsubdir = d.getVar('S')
+
+    def _move_file(src, dst):
+        """Move a file. Creates all the directory components of destination path."""
+        dst_d = os.path.dirname(dst)
+        if dst_d:
+            bb.utils.mkdirhier(dst_d)
+        shutil.move(src, dst)
+
+    def _ls_tree(directory):
+        """Recursive listing of files in a directory"""
+        ret = []
+        for root, dirs, files in os.walk(directory):
+            ret.extend([os.path.relpath(os.path.join(root, fname), directory) for
+                        fname in files])
+        return ret
+
+    # Move local source files into separate subdir
+    recipe_patches = [os.path.basename(patch) for patch in
+                        oe.recipeutils.get_recipe_patches(d)]
+    local_files = oe.recipeutils.get_recipe_local_files(d)
+
+    # Ignore local files with subdir={BP}
+    srcabspath = os.path.abspath(srcsubdir)
+    local_files = [fname for fname in local_files if
+                    os.path.exists(os.path.join(workdir, fname)) and
+                    (srcabspath == workdir or not
+                    os.path.join(workdir, fname).startswith(srcabspath +
+                        os.sep))]
+    if local_files:
+        for fname in local_files:
+            _move_file(os.path.join(workdir, fname),
+                        os.path.join(tempdir, 'oe-local-files', fname))
+        with open(os.path.join(tempdir, 'oe-local-files', '.gitignore'),
+                    'w') as f:
+            f.write('# Ignore local files, by default. Remove this file '
+                    'if you want to commit the directory to Git\n*\n')
+
+    if srcsubdir == workdir:
+        # Find non-patch non-local sources that were "unpacked" to srctree
+        # directory
+        src_files = [fname for fname in _ls_tree(workdir) if
+                        os.path.basename(fname) not in recipe_patches]
+        srcsubdir = d.getVar('DEVTOOL_PATCH_SRCDIR')
+        # Move source files to S
+        for path in src_files:
+            _move_file(os.path.join(workdir, path),
+                        os.path.join(srcsubdir, path))
+    elif os.path.dirname(srcsubdir) != workdir:
+        # Handle if S is set to a subdirectory of the source
+        srcsubdir = os.path.join(workdir, os.path.relpath(srcsubdir, workdir).split(os.sep)[0])
+
+    scriptutils.git_convert_standalone_clone(srcsubdir)
+
+    # Make sure that srcsubdir exists
+    bb.utils.mkdirhier(srcsubdir)
+    if not os.listdir(srcsubdir):
+        bb.warn("No source unpacked to S - either the %s recipe "
+                "doesn't use any source or the correct source "
+                "directory could not be determined" % d.getVar('PN'))
+
+    devbranch = d.getVar('DEVTOOL_DEVBRANCH')
+    setup_git_repo(srcsubdir, d.getVar('PV'), devbranch, d=d)
+
+    (stdout, _) = bb.process.run('git rev-parse HEAD', cwd=srcsubdir)
+    initial_rev = stdout.rstrip()
+    with open(os.path.join(tempdir, 'initial_rev'), 'w') as f:
+        f.write(initial_rev)
+
+    with open(os.path.join(tempdir, 'srcsubdir'), 'w') as f:
+        f.write(srcsubdir)
+}
+
+python devtool_pre_patch() {
+    if d.getVar('S') == d.getVar('WORKDIR'):
+        d.setVar('S', '${DEVTOOL_PATCH_SRCDIR}')
+}
+
+python devtool_post_patch() {
+    tempdir = d.getVar('DEVTOOL_TEMPDIR')
+    with open(os.path.join(tempdir, 'srcsubdir'), 'r') as f:
+        srcsubdir = f.read()
+    bb.process.run('git tag -f devtool-patched', cwd=srcsubdir)
+}
+
+python devtool_post_configure() {
+    import shutil
+    tempdir = d.getVar('DEVTOOL_TEMPDIR')
+    shutil.copy2(os.path.join(d.getVar('B'), '.config'), tempdir)
+}