How to use the scons.scons-local-250.SCons.Node.FS.Entry function in SCons

    @SCons.Memoize.CountMethodCall
    def rfile(self):
        try:
            return self._memo['rfile']
        except KeyError:
            pass
        result = self
        if not self.exists():
            norm_name = _my_normcase(self.name)
            for dir in self.dir.get_all_rdirs():
                try: node = dir.entries[norm_name]
                except KeyError: node = dir.file_on_disk(self.name)
                if node and node.exists() and \
                   (isinstance(node, File) or isinstance(node, Entry) \
                    or not node.is_derived()):
                        result = node
                        # Copy over our local attributes to the repository
                        # Node so we identify shared object files in the
                        # repository and don't assume they're static.
                        #
                        # This isn't perfect; the attribute would ideally
                        # be attached to the object in the repository in
                        # case it was built statically in the repository
                        # and we changed it to shared locally, but that's
                        # rarely the case and would only occur if you
                        # intentionally used the same suffix for both
                        # shared and static objects anyway.  So this
                        # should work well in practice.
                        result.attributes = self.attributes
                        break

def Entry(self, name, directory = None, create = 1):
        """Look up or create a generic Entry node with the specified name.
        If the name is a relative path (begins with ./, ../, or a file
        name), then it is looked up relative to the supplied directory
        node, or to the top level directory of the FS (supplied at
        construction time) if no directory is supplied.
        """
        return self._lookup(name, directory, Entry, create)

def Entry(self, name, directory = None, create = 1):
        """Look up or create a generic Entry node with the specified name.
        If the name is a relative path (begins with ./, ../, or a file
        name), then it is looked up relative to the supplied directory
        node, or to the top level directory of the FS (supplied at
        construction time) if no directory is supplied.
        """
        return self._lookup(name, directory, Entry, create)

def rel_path(self, other):
        d = self.disambiguate()
        if d.__class__ is Entry:
            raise Exception("rel_path() could not disambiguate File/Dir")
        return d.rel_path(other)

def func(node):
            if (isinstance(node, File) or isinstance(node, Entry)) and \
               (node.is_derived() or node.exists()):
                    return node
            return None

if d.__class__ is Entry:
            raise Exception("rel_path() could not disambiguate File/Dir")
        return d.rel_path(other)

    def new_ninfo(self):
        return self.disambiguate().new_ninfo()

    def _glob1(self, pattern, ondisk=True, source=False, strings=False):
        return self.disambiguate()._glob1(pattern, ondisk, source, strings)

    def get_subst_proxy(self):
        return self.disambiguate().get_subst_proxy()

# This is for later so we can differentiate between Entry the class and Entry
# the method of the FS class.
_classEntry = Entry


class LocalFS(object):

    # This class implements an abstraction layer for operations involving
    # a local file system.  Essentially, this wraps any function in
    # the os, os.path or shutil modules that we use to actually go do
    # anything with or to the local file system.
    #
    # Note that there's a very good chance we'll refactor this part of
    # the architecture in some way as we really implement the interface(s)
    # for remote file system Nodes.  For example, the right architecture
    # might be to have this be a subclass instead of a base class.
    # Nevertheless, we're using this as a first step in that direction.
    #
    # We're not using chdir() yet because the calling subclass method

def str_to_node(self, s):
        top = self.fs.Top
        root = top.root
        if do_splitdrive:
            drive, s = _my_splitdrive(s)
            if drive:
                root = self.fs.get_root(drive)
        if not os.path.isabs(s):
            s = top.get_labspath() + '/' + s
        return root._lookup_abs(s, Entry)

if d.__class__ is Entry:
            raise Exception("rel_path() could not disambiguate File/Dir")
        return d.rel_path(other)

    def new_ninfo(self):
        return self.disambiguate().new_ninfo()

    def _glob1(self, pattern, ondisk=True, source=False, strings=False):
        return self.disambiguate()._glob1(pattern, ondisk, source, strings)

    def get_subst_proxy(self):
        return self.disambiguate().get_subst_proxy()

# This is for later so we can differentiate between Entry the class and Entry
# the method of the FS class.
_classEntry = Entry


class LocalFS(object):

    # This class implements an abstraction layer for operations involving
    # a local file system.  Essentially, this wraps any function in
    # the os, os.path or shutil modules that we use to actually go do
    # anything with or to the local file system.
    #
    # Note that there's a very good chance we'll refactor this part of
    # the architecture in some way as we really implement the interface(s)
    # for remote file system Nodes.  For example, the right architecture
    # might be to have this be a subclass instead of a base class.
    # Nevertheless, we're using this as a first step in that direction.
    #
    # We're not using chdir() yet because the calling subclass method

    @SCons.Memoize.CountMethodCall
    def rfile(self):
        try:
            return self._memo['rfile']
        except KeyError:
            pass
        result = self
        if not self.exists():
            norm_name = _my_normcase(self.name)
            for dir in self.dir.get_all_rdirs():
                try: node = dir.entries[norm_name]
                except KeyError: node = dir.file_on_disk(self.name)
                if node and node.exists() and \
                   (isinstance(node, File) or isinstance(node, Entry) \
                    or not node.is_derived()):
                        result = node
                        # Copy over our local attributes to the repository
                        # Node so we identify shared object files in the
                        # repository and don't assume they're static.
                        #
                        # This isn't perfect; the attribute would ideally
                        # be attached to the object in the repository in
                        # case it was built statically in the repository
                        # and we changed it to shared locally, but that's
                        # rarely the case and would only occur if you
                        # intentionally used the same suffix for both
                        # shared and static objects anyway.  So this
                        # should work well in practice.
                        result.attributes = self.attributes
                        break