diff --git a/swh/loader/svn/ra.py b/swh/loader/svn/ra.py
index 7bd7718..4258d96 100644
--- a/swh/loader/svn/ra.py
+++ b/swh/loader/svn/ra.py
@@ -1,505 +1,508 @@
 # Copyright (C) 2016-2018  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 """Remote Access client to svn server.
 
 """
 
 import click
 import codecs
 import os
 import shutil
 import tempfile
 
 from subvertpy import delta, properties
 from subvertpy.ra import RemoteAccess, Auth, get_username_provider
 
 from swh.model import hashutil
 from swh.model.from_disk import Content, Directory
 
 
 _eol_style = {
     'native': b'\n',
     'CRLF': b'\r\n',
     'LF': b'\n',
     'CR': b'\r'
 }
 
 
 def _normalize_line_endings(lines, eol_style='native'):
-    """Normalize line endings to unix (\n), windows (\r\n) or mac (\r).
+    r"""Normalize line endings to unix (\\n), windows (\\r\\n) or mac (\\r).
+
     Args:
         lines (bytes): The lines to normalize
+
         line_ending (str): The line ending format as defined for
             svn:eol-style property. Acceptable values are 'native',
             'CRLF', 'LF' and 'CR'
-    Returns
+
+    Returns:
         bytes: lines with endings normalized
     """
     lines = lines.replace(_eol_style['CRLF'], _eol_style['LF'])\
                  .replace(_eol_style['CR'], _eol_style['LF'])
     if _eol_style[eol_style] != _eol_style['LF']:
         lines = lines.replace(_eol_style['LF'], _eol_style[eol_style])
 
     return lines
 
 
 def apply_txdelta_handler(sbuf, target_stream):
     """Return a function that can be called repeatedly with txdelta windows.
     When done, closes the target_stream.
 
     Adapted from subvertpy.delta.apply_txdelta_handler to close the
     stream when done.
 
     Args:
         sbuf: Source buffer
         target_stream: Target stream to write to.
 
     Returns:
         Function to be called to apply txdelta windows
 
     """
     def apply_window(window, sbuf=sbuf, target_stream=target_stream):
         if window is None:
             target_stream.close()
             return  # Last call
         patch = delta.apply_txdelta_window(sbuf, window)
         target_stream.write(patch)
     return apply_window
 
 
 def read_svn_link(data):
     """Read the svn link's content.
 
     Args:
         data (bytes): svn link's raw content
 
     Returns:
         The tuple of (filetype, destination path)
 
     """
     split_byte = b' '
     filetype, *src = data.split(split_byte)
     src = split_byte.join(src)
     return filetype, src
 
 
 def is_file_an_svnlink_p(fullpath):
     """Determine if a filepath is an svnlink or something else.
 
     Args:
         fullpath (str/bytes): Full path to the potential symlink to check
 
-    Return:
+    Returns:
         boolean value to determine if it's indeed a symlink (as per
         svn) or not.
 
     """
     with open(fullpath, 'rb') as f:
         filetype, src = read_svn_link(f.read())
         return filetype == b'link', src
 
 
 def _ra_codecs_error_handler(e):
     """Subvertpy may fail to decode to utf-8 the user svn properties.  As
        they are not used by the loader, return an empty string instead
        of the decoded content.
 
     Args:
         e (UnicodeDecodeError): exception raised during the svn
                                 properties decoding.
 
     """
     return u"", e.end
 
 
 DEFAULT_FLAG = 0
 EXEC_FLAG = 1
 NOEXEC_FLAG = 2
 
 SVN_PROPERTY_EOL = 'svn:eol-style'
 
 # EOL state check mess
 EOL_STYLE = {}
 
 
 class FileEditor:
     """File Editor in charge of updating file on disk and memory objects.
 
     """
     __slots__ = ['directory', 'path', 'fullpath', 'executable', 'link']
 
     def __init__(self, directory, rootpath, path):
         self.directory = directory
         self.path = path
         # default value: 0, 1: set the flag, 2: remove the exec flag
         self.executable = DEFAULT_FLAG
         self.link = None
         self.fullpath = os.path.join(rootpath, path)
 
     def change_prop(self, key, value):
         if key == properties.PROP_EXECUTABLE:
             if value is None:  # bit flip off
                 self.executable = NOEXEC_FLAG
             else:
                 self.executable = EXEC_FLAG
         elif key == properties.PROP_SPECIAL:
             # Possibly a symbolic link. We cannot check further at
             # that moment though, patch(s) not being applied yet
             self.link = True
         elif key == SVN_PROPERTY_EOL:
             # backup end of line style for file
             EOL_STYLE[self.fullpath] = value
 
     def __make_symlink(self, src):
         """Convert the svnlink to a symlink on disk.
 
         This function expects self.fullpath to be a svn link.
 
         Args:
             src (bytes): Path to the link's source
 
         Return:
             tuple: The svnlink's data tuple:
 
                 - type (should be only 'link')
                 - <path-to-src>
 
         """
         os.remove(self.fullpath)
         os.symlink(src=src, dst=self.fullpath)
 
     def __make_svnlink(self):
         """Convert the symlink to a svnlink on disk.
 
         Return:
             The symlink's svnlink data (``b'type <path-to-src>'``)
 
         """
         # we replace the symlink by a svnlink
         # to be able to patch the file on future commits
         src = os.readlink(self.fullpath)
         os.remove(self.fullpath)
         sbuf = b'link ' + src
         with open(self.fullpath, 'wb') as f:
             f.write(sbuf)
         return sbuf
 
     def apply_textdelta(self, base_checksum):
         if os.path.lexists(self.fullpath):
             if os.path.islink(self.fullpath):
                 # svn does not deal with symlink so we transform into
                 # real svn symlink for potential patching in later
                 # commits
                 sbuf = self.__make_svnlink()
                 self.link = True
             else:
                 with open(self.fullpath, 'rb') as f:
                     sbuf = f.read()
         else:
             sbuf = b''
 
         t = open(self.fullpath, 'wb')
         return apply_txdelta_handler(sbuf, target_stream=t)
 
     def close(self):
         """When done with the file, this is called.
 
         So the file exists and is updated, we can:
 
         - adapt accordingly its execution flag if any
         - compute the objects' checksums
         - replace the svnlink with a real symlink (for disk
           computation purposes)
 
         """
         is_link = None
 
         if self.link:
             # can only check now that the link is a real one
             # since patch has been applied
             is_link, src = is_file_an_svnlink_p(self.fullpath)
             if is_link:
                 self.__make_symlink(src)
             else:  # not a real link...
                 self.link = False
 
         if not is_link:  # if a link, do nothing regarding flag
             if self.executable == EXEC_FLAG:
                 os.chmod(self.fullpath, 0o755)
             elif self.executable == NOEXEC_FLAG:
                 os.chmod(self.fullpath, 0o644)
 
         # And now compute file's checksums
         eol_style = EOL_STYLE.get(self.fullpath, None)
         if eol_style:
             # ensure to normalize line endings as defined by svn:eol-style
             # property to get the same file checksum as after an export
             # or checkout operation with subversion
             with open(self.fullpath, 'rb') as f:
                 data = f.read()
                 data = _normalize_line_endings(data, eol_style)
                 mode = os.lstat(self.fullpath).st_mode
                 self.directory[self.path] = Content.from_bytes(mode=mode,
                                                                data=data)
         else:
             self.directory[self.path] = Content.from_file(path=self.fullpath,
                                                           data=True)
 
 
 class BaseDirEditor:
     """Base class implementation of dir editor.
 
     see :class:`DirEditor` for an implementation that hashes every
     directory encountered.
 
     Instantiate a new class inheriting from this class and define the following
     functions::
 
         def update_checksum(self):
             # Compute the checksums at current state
 
         def open_directory(self, *args):
             # Update an existing folder.
 
         def add_directory(self, *args):
             # Add a new one.
 
     """
     __slots__ = ['directory', 'rootpath']
 
     def __init__(self, directory, rootpath):
         self.directory = directory
         self.rootpath = rootpath
         # build directory on init
         os.makedirs(rootpath, exist_ok=True)
 
     def remove_child(self, path):
         """Remove a path from the current objects.
 
         The path can be resolved as link, file or directory.
 
         This function takes also care of removing the link between the
         child and the parent.
 
         Args:
             path: to remove from the current objects.
 
         """
         try:
             entry_removed = self.directory[path]
         except KeyError:
             entry_removed = None
         else:
             del self.directory[path]
             fpath = os.path.join(self.rootpath, path)
             if isinstance(entry_removed, Directory):
                 shutil.rmtree(fpath)
             else:
                 os.remove(fpath)
         if path in EOL_STYLE:
             del EOL_STYLE[path]
 
     def update_checksum(self):
         raise NotImplementedError('This should be implemented.')
 
     def open_directory(self, *args):
         raise NotImplementedError('This should be implemented.')
 
     def add_directory(self, *args):
         raise NotImplementedError('This should be implemented.')
 
     def open_file(self, *args):
         """Updating existing file.
 
         """
         path = os.fsencode(args[0])
         self.directory[path] = Content()
         return FileEditor(self.directory, rootpath=self.rootpath, path=path)
 
     def add_file(self, path, copyfrom_path=None, copyfrom_rev=-1):
         """Creating a new file.
 
         """
         path = os.fsencode(path)
         self.directory[path] = Content()
         return FileEditor(self.directory, self.rootpath, path)
 
     def change_prop(self, key, value):
         """Change property callback on directory.
 
         """
         if key == properties.PROP_EXTERNALS:
             raise ValueError(
                 "Property '%s' detected. Not implemented yet." % key)
 
     def delete_entry(self, path, revision):
         """Remove a path.
 
         """
         self.remove_child(path.encode('utf-8'))
 
     def close(self):
         """Function called when we finish walking a repository.
 
         """
         self.update_checksum()
 
 
 class DirEditor(BaseDirEditor):
     """Directory Editor in charge of updating directory hashes computation.
 
     This implementation includes empty folder in the hash computation.
 
     """
     def update_checksum(self):
         """Update the root path self.path's checksums according to the
         children's objects.
 
         This function is expected to be called when the folder has
         been completely 'walked'.
 
         """
         pass
 
     def open_directory(self, *args):
         """Updating existing directory.
 
         """
         return self
 
     def add_directory(self, path, copyfrom_path=None, copyfrom_rev=-1):
         """Adding a new directory.
 
         """
         path = os.fsencode(path)
         os.makedirs(os.path.join(self.rootpath, path), exist_ok=True)
         self.directory[path] = Directory()
         return self
 
 
 class Editor:
     """Editor in charge of replaying svn events and computing objects
        along.
 
        This implementation accounts for empty folder during hash
        computations.
 
     """
     def __init__(self, rootpath, directory):
         self.rootpath = rootpath
         self.directory = directory
 
     def set_target_revision(self, revnum):
         pass
 
     def abort(self):
         pass
 
     def close(self):
         pass
 
     def open_root(self, base_revnum):
         return DirEditor(self.directory, rootpath=self.rootpath)
 
 
 class Replay:
     """Replay class.
     """
     def __init__(self, conn, rootpath, directory=None):
         self.conn = conn
         self.rootpath = rootpath
         if directory is None:
             directory = Directory()
         self.directory = directory
         self.editor = Editor(rootpath=rootpath, directory=directory)
 
     def replay(self, rev):
         """Replay svn actions between rev and rev+1.
 
         This method updates in place the self.editor.directory, as well as the
         filesystem.
 
         Returns:
            The updated root directory
 
         """
         codecs.register_error("strict", _ra_codecs_error_handler)
         self.conn.replay(rev, rev+1, self.editor)
         codecs.register_error("strict", codecs.strict_errors)
         return self.editor.directory
 
     def compute_hashes(self, rev):
         """Compute hashes at revisions rev.
         Expects the state to be at previous revision's objects.
 
         Args:
             rev: The revision to start the replay from.
 
         Returns:
             The updated objects between rev and rev+1. Beware that this
             mutates the filesystem at rootpath accordingly.
 
         """
         self.replay(rev)
         return self.directory.collect()
 
 
 @click.command()
 @click.option('--local-url', default='/tmp',
               help="local svn working copy")
 @click.option('--svn-url', default='file:///home/storage/svn/repos/pkg-fox',
               help="svn repository's url.")
 @click.option('--revision-start', default=1, type=click.INT,
               help="svn repository's starting revision.")
 @click.option('--revision-end', default=-1, type=click.INT,
               help="svn repository's ending revision.")
 @click.option('--debug/--nodebug', default=True,
               help="Indicates if the server should run in debug mode.")
 @click.option('--cleanup/--nocleanup', default=True,
               help="Indicates whether to cleanup disk when done or not.")
 def main(local_url, svn_url, revision_start, revision_end, debug, cleanup):
     """Script to present how to use Replay class.
 
     """
     conn = RemoteAccess(svn_url.encode('utf-8'),
                         auth=Auth([get_username_provider()]))
 
     os.makedirs(local_url, exist_ok=True)
 
     rootpath = tempfile.mkdtemp(prefix=local_url,
                                 suffix='-'+os.path.basename(svn_url))
 
     rootpath = os.fsencode(rootpath)
 
     # Do not go beyond the repository's latest revision
     revision_end_max = conn.get_latest_revnum()
     if revision_end == -1:
         revision_end = revision_end_max
 
     revision_end = min(revision_end, revision_end_max)
 
     try:
         replay = Replay(conn, rootpath)
 
         for rev in range(revision_start, revision_end+1):
             objects = replay.compute_hashes(rev)
             print("r%s %s (%s new contents, %s new directories)" % (
                 rev,
                 hashutil.hash_to_hex(replay.directory.hash),
                 len(objects.get('content', {})),
                 len(objects.get('directory', {})),
             ))
 
         if debug:
             print('%s' % rootpath.decode('utf-8'))
     finally:
         if cleanup:
             if os.path.exists(rootpath):
                 shutil.rmtree(rootpath)
 
 
 if __name__ == '__main__':
     main()