diff --git a/kallithea/controllers/admin/admin.py b/kallithea/controllers/admin/admin.py
--- a/kallithea/controllers/admin/admin.py
+++ b/kallithea/controllers/admin/admin.py
@@ -54,13 +54,13 @@ def _journal_filter(user_log, search_ter
     :param user_log:
     :param search_term:
     """
-    log.debug('Initial search term: %r' % search_term)
+    log.debug('Initial search term: %r', search_term)
     qry = None
     if search_term:
         qp = QueryParser('repository', schema=JOURNAL_SCHEMA)
         qp.add_plugin(DateParserPlugin())
         qry = qp.parse(unicode(search_term))
-        log.debug('Filtering using parsed query %r' % qry)
+        log.debug('Filtering using parsed query %r', qry)
 
     def wildcard_handler(col, wc_term):
         if wc_term.startswith('*') and not wc_term.endswith('*'):
@@ -85,7 +85,7 @@ def _journal_filter(user_log, search_ter
             field = getattr(UserLog, 'username')
         else:
             field = getattr(UserLog, field)
-        log.debug('filter field: %s val=>%s' % (field, val))
+        log.debug('filter field: %s val=>%s', field, val)
 
         #sql filtering
         if isinstance(term, query.Wildcard):
diff --git a/kallithea/controllers/admin/auth_settings.py b/kallithea/controllers/admin/auth_settings.py
--- a/kallithea/controllers/admin/auth_settings.py
+++ b/kallithea/controllers/admin/auth_settings.py
@@ -128,7 +128,7 @@ class AuthSettingsController(BaseControl
                 if k == 'auth_plugins':
                     # we want to store it comma separated inside our settings
                     v = ','.join(v)
-                log.debug("%s = %s" % (k, str(v)))
+                log.debug("%s = %s", k, str(v))
                 setting = Setting.create_or_update(k, v)
                 Session().add(setting)
             Session().commit()
diff --git a/kallithea/controllers/admin/gists.py b/kallithea/controllers/admin/gists.py
--- a/kallithea/controllers/admin/gists.py
+++ b/kallithea/controllers/admin/gists.py
@@ -196,8 +196,8 @@ class GistsController(BaseController):
         #check if this gist is not expired
         if c.gist.gist_expires != -1:
             if time.time() > c.gist.gist_expires:
-                log.error('Gist expired at %s' %
-                          (time_to_datetime(c.gist.gist_expires)))
+                log.error('Gist expired at %s',
+                          time_to_datetime(c.gist.gist_expires))
                 raise HTTPNotFound()
         try:
             c.file_changeset, c.files = GistModel().get_gist_files(gist_id,
@@ -221,8 +221,8 @@ class GistsController(BaseController):
         #check if this gist is not expired
         if c.gist.gist_expires != -1:
             if time.time() > c.gist.gist_expires:
-                log.error('Gist expired at %s' %
-                          (time_to_datetime(c.gist.gist_expires)))
+                log.error('Gist expired at %s',
+                          time_to_datetime(c.gist.gist_expires))
                 raise HTTPNotFound()
         try:
             c.file_changeset, c.files = GistModel().get_gist_files(gist_id)
@@ -285,8 +285,8 @@ class GistsController(BaseController):
 
         ##TODO: maybe move this to model ?
         if revision != last_rev.raw_id:
-            log.error('Last revision %s is different than submitted %s'
-                      % (revision, last_rev))
+            log.error('Last revision %s is different than submitted %s',
+                      revision, last_rev)
             # our gist has newer version than we
             success = False
 
diff --git a/kallithea/controllers/admin/settings.py b/kallithea/controllers/admin/settings.py
--- a/kallithea/controllers/admin/settings.py
+++ b/kallithea/controllers/admin/settings.py
@@ -497,7 +497,7 @@ class SettingsController(BaseController)
         try:
             import kallithea
             ver = kallithea.__version__
-            log.debug('Checking for upgrade on `%s` server' % _update_url)
+            log.debug('Checking for upgrade on `%s` server', _update_url)
             opener = urllib2.build_opener()
             opener.addheaders = [('User-agent', 'Kallithea-SCM/%s' % ver)]
             response = opener.open(_update_url)
diff --git a/kallithea/controllers/api/__init__.py b/kallithea/controllers/api/__init__.py
--- a/kallithea/controllers/api/__init__.py
+++ b/kallithea/controllers/api/__init__.py
@@ -117,7 +117,7 @@ class JSONRPCController(WSGIController):
         else:
             length = environ['CONTENT_LENGTH'] or 0
             length = int(environ['CONTENT_LENGTH'])
-            log.debug('Content-Length: %s' % length)
+            log.debug('Content-Length: %s', length)
 
         if length == 0:
             log.debug("Content-Length is 0")
@@ -144,8 +144,8 @@ class JSONRPCController(WSGIController):
                 self._request_params = {}
 
             log.debug(
-                'method: %s, params: %s' % (self._req_method,
-                                            self._request_params)
+                'method: %s, params: %s', self._req_method,
+                                            self._request_params
             )
         except KeyError as e:
             return jsonrpc_error(retid=self._req_id,
@@ -163,7 +163,7 @@ class JSONRPCController(WSGIController):
                 return jsonrpc_error(retid=self._req_id,
                         message='request from IP:%s not allowed' % (ip_addr,))
             else:
-                log.info('Access for IP:%s allowed' % (ip_addr,))
+                log.info('Access for IP:%s allowed', ip_addr)
 
         except Exception as e:
             return jsonrpc_error(retid=self._req_id,
@@ -261,8 +261,8 @@ class JSONRPCController(WSGIController):
         except JSONRPCError as e:
             self._error = safe_str(e)
         except Exception as e:
-            log.error('Encountered unhandled exception: %s'
-                      % (traceback.format_exc(),))
+            log.error('Encountered unhandled exception: %s',
+                      traceback.format_exc(),)
             json_exc = JSONRPCError('Internal server error')
             self._error = safe_str(json_exc)
 
@@ -273,7 +273,7 @@ class JSONRPCController(WSGIController):
         try:
             return json.dumps(response)
         except TypeError as e:
-            log.error('API FAILED. Error encoding response: %s' % e)
+            log.error('API FAILED. Error encoding response: %s', e)
             return json.dumps(
                 dict(
                     id=self._req_id,
@@ -286,7 +286,7 @@ class JSONRPCController(WSGIController):
         """
         Return method named by `self._req_method` in controller if able
         """
-        log.debug('Trying to find JSON-RPC method: %s' % (self._req_method,))
+        log.debug('Trying to find JSON-RPC method: %s', self._req_method)
         if self._req_method.startswith('_'):
             raise AttributeError("Method not allowed")
 
diff --git a/kallithea/controllers/changelog.py b/kallithea/controllers/changelog.py
--- a/kallithea/controllers/changelog.py
+++ b/kallithea/controllers/changelog.py
@@ -129,7 +129,7 @@ class ChangelogController(BaseRepoContro
         try:
 
             if f_path:
-                log.debug('generating changelog for path %s' % f_path)
+                log.debug('generating changelog for path %s', f_path)
                 # get the history for the file !
                 tip_cs = c.db_repo_scm_instance.get_changeset()
                 try:
diff --git a/kallithea/controllers/compare.py b/kallithea/controllers/compare.py
--- a/kallithea/controllers/compare.py
+++ b/kallithea/controllers/compare.py
@@ -246,8 +246,8 @@ class CompareController(BaseRepoControll
             # case we want a simple diff without incoming changesets,
             # previewing what will be merged.
             # Make the diff on the other repo (which is known to have other_rev)
-            log.debug('Using ancestor %s as rev1 instead of %s'
-                      % (c.ancestor, c.a_rev))
+            log.debug('Using ancestor %s as rev1 instead of %s',
+                      c.ancestor, c.a_rev)
             rev1 = c.ancestor
             org_repo = other_repo
         else: # comparing tips, not necessarily linearly related
@@ -262,8 +262,8 @@ class CompareController(BaseRepoControll
 
         diff_limit = self.cut_off_limit if not c.fulldiff else None
 
-        log.debug('running diff between %s and %s in %s'
-                  % (rev1, c.cs_rev, org_repo.scm_instance.path))
+        log.debug('running diff between %s and %s in %s',
+                  rev1, c.cs_rev, org_repo.scm_instance.path)
         txtdiff = org_repo.scm_instance.get_diff(rev1=rev1, rev2=c.cs_rev,
                                       ignore_whitespace=ignore_whitespace,
                                       context=line_context)
diff --git a/kallithea/controllers/error.py b/kallithea/controllers/error.py
--- a/kallithea/controllers/error.py
+++ b/kallithea/controllers/error.py
@@ -57,7 +57,7 @@ class ErrorController(BaseController):
         resp = request.environ.get('pylons.original_response')
         c.site_name = config.get('title')
 
-        log.debug('### %s ###' % (resp and resp.status or 'no response'))
+        log.debug('### %s ###', resp and resp.status or 'no response')
 
         e = request.environ
         c.serv_p = r'%(protocol)s://%(host)s/' % {
diff --git a/kallithea/controllers/files.py b/kallithea/controllers/files.py
--- a/kallithea/controllers/files.py
+++ b/kallithea/controllers/files.py
@@ -554,21 +554,21 @@ class FilesController(BaseRepoController
                 os.makedirs(archive_cache_dir)
             cached_archive_path = os.path.join(archive_cache_dir, archive_name)
             if os.path.isfile(cached_archive_path):
-                log.debug('Found cached archive in %s' % cached_archive_path)
+                log.debug('Found cached archive in %s', cached_archive_path)
                 archive_path = cached_archive_path
             else:
-                log.debug('Archive %s is not yet cached' % (archive_name))
+                log.debug('Archive %s is not yet cached', archive_name)
 
         if archive_path is None:
             # generate new archive
             fd, archive_path = tempfile.mkstemp()
-            log.debug('Creating new temp archive in %s' % archive_path)
+            log.debug('Creating new temp archive in %s', archive_path)
             with os.fdopen(fd, 'wb') as stream:
                 cs.fill_archive(stream=stream, kind=fileformat, subrepos=subrepos)
                 # stream (and thus fd) has been closed by cs.fill_archive
             if cached_archive_path is not None:
                 # we generated the archive - move it to cache
-                log.debug('Storing new archive in %s' % cached_archive_path)
+                log.debug('Storing new archive in %s', cached_archive_path)
                 shutil.move(archive_path, cached_archive_path)
                 archive_path = cached_archive_path
 
@@ -581,7 +581,7 @@ class FilesController(BaseRepoController
                 yield data
             stream.close()
             if archive_path != cached_archive_path:
-                log.debug('Destroying temp archive %s' % archive_path)
+                log.debug('Destroying temp archive %s', archive_path)
                 os.remove(archive_path)
 
         action_logger(user=c.authuser,
diff --git a/kallithea/controllers/login.py b/kallithea/controllers/login.py
--- a/kallithea/controllers/login.py
+++ b/kallithea/controllers/login.py
@@ -64,8 +64,8 @@ class LoginController(BaseController):
         server_parsed = urlparse.urlparse(url.current())
         allowed_schemes = ['http', 'https']
         if parsed.scheme and parsed.scheme not in allowed_schemes:
-            log.error('Suspicious URL scheme detected %s for url %s' %
-                     (parsed.scheme, parsed))
+            log.error('Suspicious URL scheme detected %s for url %s',
+                     parsed.scheme, parsed)
             return False
         if server_parsed.netloc != parsed.netloc:
             log.error('Suspicious NETLOC detected %s for url %s server url '
diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -641,8 +641,8 @@ class PullrequestsController(BaseRepoCon
         diff_limit = self.cut_off_limit if not c.fulldiff else None
 
         # we swap org/other ref since we run a simple diff on one repo
-        log.debug('running diff between %s and %s in %s'
-                  % (c.a_rev, c.cs_rev, org_scm_instance.path))
+        log.debug('running diff between %s and %s in %s',
+                  c.a_rev, c.cs_rev, org_scm_instance.path)
         txtdiff = org_scm_instance.get_diff(rev1=safe_str(c.a_rev), rev2=safe_str(c.cs_rev),
                                       ignore_whitespace=ignore_whitespace,
                                       context=line_context)
diff --git a/kallithea/controllers/search.py b/kallithea/controllers/search.py
--- a/kallithea/controllers/search.py
+++ b/kallithea/controllers/search.py
@@ -77,8 +77,8 @@ class SearchController(BaseRepoControlle
             'path': SCHEMA
         }.get(c.cur_type, SCHEMA)
 
-        log.debug('IDX: %s' % index_name)
-        log.debug('SCHEMA: %s' % schema_defn)
+        log.debug('IDX: %s', index_name)
+        log.debug('SCHEMA: %s', schema_defn)
 
         if c.cur_query:
             cur_query = c.cur_query.lower()
@@ -109,8 +109,8 @@ class SearchController(BaseRepoControlle
 
                     matcher = query.matcher(searcher)
 
-                    log.debug('query: %s' % query)
-                    log.debug('hl terms: %s' % highlight_items)
+                    log.debug('query: %s', query)
+                    log.debug('hl terms: %s', highlight_items)
                     results = searcher.search(query)
                     res_ln = len(results)
                     c.runtime = '%s results (%.3f seconds)' % (
diff --git a/kallithea/controllers/summary.py b/kallithea/controllers/summary.py
--- a/kallithea/controllers/summary.py
+++ b/kallithea/controllers/summary.py
@@ -87,7 +87,7 @@ class SummaryController(BaseRepoControll
                         if not isinstance(readme, FileNode):
                             continue
                         readme_file = f
-                        log.debug('Found README file `%s` rendering...' %
+                        log.debug('Found README file `%s` rendering...',
                                   readme_file)
                         readme_data = renderer.render(readme.content,
                                                       filename=f)
diff --git a/kallithea/lib/auth.py b/kallithea/lib/auth.py
--- a/kallithea/lib/auth.py
+++ b/kallithea/lib/auth.py
@@ -439,10 +439,10 @@ def allowed_api_access(controller_name, 
         from kallithea import CONFIG
         whitelist = aslist(CONFIG.get('api_access_controllers_whitelist'),
                            sep=',')
-        log.debug('whitelist of API access is: %s' % (whitelist))
+        log.debug('whitelist of API access is: %s', whitelist)
     api_access_valid = controller_name in whitelist
     if api_access_valid:
-        log.debug('controller:%s is in API whitelist' % (controller_name))
+        log.debug('controller:%s is in API whitelist', controller_name)
     else:
         msg = 'controller: %s is *NOT* in API whitelist' % (controller_name)
         if api_key:
@@ -497,7 +497,7 @@ class AuthUser(object):
 
         # Look up database user, if necessary.
         if user_id is not None:
-            log.debug('Auth User lookup by USER ID %s' % user_id)
+            log.debug('Auth User lookup by USER ID %s', user_id)
             dbuser = user_model.get(user_id)
         else:
             # Note: dbuser is allowed to be None.
@@ -516,7 +516,7 @@ class AuthUser(object):
         if not self.username:
             self.username = 'None'
 
-        log.debug('Auth User is now %s' % self)
+        log.debug('Auth User is now %s', self)
 
     def _fill_data(self, dbuser):
         """
@@ -615,7 +615,7 @@ class AuthUser(object):
         allowed_ips = AuthUser.get_allowed_ips(user.user_id, cache=True,
             inherit_from_default=user.inherit_default_permissions)
         if check_ip_access(source_ip=ip_addr, allowed_ips=allowed_ips):
-            log.debug('IP:%s is in range of %s' % (ip_addr, allowed_ips))
+            log.debug('IP:%s is in range of %s', ip_addr, allowed_ips)
             return True
         else:
             log.info('Access for IP:%s forbidden, '
@@ -716,7 +716,7 @@ def redirect_to_login(message=None):
     p = url.current()
     if message:
         h.flash(h.literal(message), category='warning')
-    log.debug('Redirecting to login page, origin: %s' % p)
+    log.debug('Redirecting to login page, origin: %s', p)
     return redirect(url('login_home', came_from=p, **request.GET))
 
 class LoginRequired(object):
@@ -738,7 +738,7 @@ class LoginRequired(object):
         controller = fargs[0]
         user = controller.authuser
         loc = "%s:%s" % (controller.__class__.__name__, func.__name__)
-        log.debug('Checking access for user %s @ %s' % (user, loc))
+        log.debug('Checking access for user %s @ %s', user, loc)
 
         if not AuthUser.check_ip_allowed(user, controller.ip_addr):
             return redirect_to_login(_('IP %s not allowed') % controller.ip_addr)
@@ -749,15 +749,15 @@ class LoginRequired(object):
             # explicit controller is enabled or API is in our whitelist
             if self.api_access or allowed_api_access(loc, api_key=api_key):
                 if api_key in user.api_keys:
-                    log.info('user %s authenticated with API key ****%s @ %s'
-                             % (user, api_key[-4:], loc))
+                    log.info('user %s authenticated with API key ****%s @ %s',
+                             user, api_key[-4:], loc)
                     return func(*fargs, **fkwargs)
                 else:
-                    log.warning('API key ****%s is NOT valid' % api_key[-4:])
+                    log.warning('API key ****%s is NOT valid', api_key[-4:])
                     return redirect_to_login(_('Invalid API key'))
             else:
                 # controller does not allow API access
-                log.warning('API access to %s is not allowed' % loc)
+                log.warning('API access to %s is not allowed', loc)
                 return abort(403)
 
         # CSRF protection - POSTs with session auth must contain correct token
@@ -769,10 +769,10 @@ class LoginRequired(object):
 
         # regular user authentication
         if user.is_authenticated:
-            log.info('user %s authenticated with regular auth @ %s' % (user, loc))
+            log.info('user %s authenticated with regular auth @ %s', user, loc)
             return func(*fargs, **fkwargs)
         else:
-            log.warning('user %s NOT authenticated with regular auth @ %s' % (user, loc))
+            log.warning('user %s NOT authenticated with regular auth @ %s', user, loc)
             return redirect_to_login()
 
 class NotAnonymous(object):
@@ -787,7 +787,7 @@ class NotAnonymous(object):
         cls = fargs[0]
         self.user = cls.authuser
 
-        log.debug('Checking if user is not anonymous @%s' % cls)
+        log.debug('Checking if user is not anonymous @%s', cls)
 
         anonymous = self.user.username == User.DEFAULT_USER
 
@@ -813,14 +813,14 @@ class PermsDecorator(object):
         self.user = cls.authuser
         self.user_perms = self.user.permissions
         log.debug('checking %s permissions %s for %s %s',
-           self.__class__.__name__, self.required_perms, cls, self.user)
+          self.__class__.__name__, self.required_perms, cls, self.user)
 
         if self.check_permissions():
-            log.debug('Permission granted for %s %s' % (cls, self.user))
+            log.debug('Permission granted for %s %s', cls, self.user)
             return func(*fargs, **fkwargs)
 
         else:
-            log.debug('Permission denied for %s %s' % (cls, self.user))
+            log.debug('Permission denied for %s %s', cls, self.user)
             anonymous = self.user.username == User.DEFAULT_USER
 
             if anonymous:
@@ -1003,15 +1003,15 @@ class PermsFunction(object):
             return False
         self.user_perms = user.permissions
         if self.check_permissions():
-            log.debug('Permission to %s granted for user: %s @ %s'
-                      % (check_scope, user,
-                         check_location or 'unspecified location'))
+            log.debug('Permission to %s granted for user: %s @ %s',
+                      check_scope, user,
+                         check_location or 'unspecified location')
             return True
 
         else:
-            log.debug('Permission to %s denied for user: %s @ %s'
-                      % (check_scope, user,
-                         check_location or 'unspecified location'))
+            log.debug('Permission to %s denied for user: %s @ %s',
+                      check_scope, user,
+                         check_location or 'unspecified location')
             return False
 
     def check_permissions(self):
@@ -1163,11 +1163,11 @@ class HasPermissionAnyMiddleware(object)
                   'permissions %s for user:%s repository:%s', self.user_perms,
                                                 self.username, self.repo_name)
         if self.required_perms.intersection(self.user_perms):
-            log.debug('Permission to repo: %s granted for user: %s @ %s'
-                      % (self.repo_name, self.username, 'PermissionMiddleware'))
+            log.debug('Permission to repo: %s granted for user: %s @ %s',
+                      self.repo_name, self.username, 'PermissionMiddleware')
             return True
-        log.debug('Permission to repo: %s denied for user: %s @ %s'
-                  % (self.repo_name, self.username, 'PermissionMiddleware'))
+        log.debug('Permission to repo: %s denied for user: %s @ %s',
+                  self.repo_name, self.username, 'PermissionMiddleware')
         return False
 
 
@@ -1188,8 +1188,8 @@ class _BaseApiPerm(object):
         if group_name:
             check_scope += ', repo group:%s' % (group_name)
 
-        log.debug('checking cls:%s %s %s @ %s'
-                  % (cls_name, self.required_perms, check_scope, check_location))
+        log.debug('checking cls:%s %s %s @ %s',
+                  cls_name, self.required_perms, check_scope, check_location)
         if not user:
             log.debug('Empty User passed into arguments')
             return False
@@ -1200,13 +1200,13 @@ class _BaseApiPerm(object):
         if not check_location:
             check_location = 'unspecified'
         if self.check_permissions(user.permissions, repo_name, group_name):
-            log.debug('Permission to %s granted for user: %s @ %s'
-                      % (check_scope, user, check_location))
+            log.debug('Permission to %s granted for user: %s @ %s',
+                      check_scope, user, check_location)
             return True
 
         else:
-            log.debug('Permission to %s denied for user: %s @ %s'
-                      % (check_scope, user, check_location))
+            log.debug('Permission to %s denied for user: %s @ %s',
+                      check_scope, user, check_location)
             return False
 
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
@@ -1288,11 +1288,11 @@ def check_ip_access(source_ip, allowed_i
     :param allowed_ips: list of allowed ips together with mask
     """
     from kallithea.lib import ipaddr
-    log.debug('checking if ip:%s is subnet of %s' % (source_ip, allowed_ips))
+    log.debug('checking if ip:%s is subnet of %s', source_ip, allowed_ips)
     if isinstance(allowed_ips, (tuple, list, set)):
         for ip in allowed_ips:
             if ipaddr.IPAddress(source_ip) in ipaddr.IPNetwork(ip):
-                log.debug('IP %s is network %s' %
-                          (ipaddr.IPAddress(source_ip), ipaddr.IPNetwork(ip)))
+                log.debug('IP %s is network %s',
+                          ipaddr.IPAddress(source_ip), ipaddr.IPNetwork(ip))
                 return True
     return False
diff --git a/kallithea/lib/auth_modules/__init__.py b/kallithea/lib/auth_modules/__init__.py
--- a/kallithea/lib/auth_modules/__init__.py
+++ b/kallithea/lib/auth_modules/__init__.py
@@ -74,7 +74,7 @@ class KallitheaAuthPluginBase(object):
             def __call__(self, *args, **kwargs):
                 from kallithea.model import validators as v
                 obj = getattr(v, self.validator_name)
-                #log.debug('Initializing lazy formencode object: %s' % obj)
+                #log.debug('Initializing lazy formencode object: %s', obj)
                 return LazyFormencode(obj, *args, **kwargs)
 
 
@@ -120,8 +120,8 @@ class KallitheaAuthPluginBase(object):
             return False
 
         if user and user.extern_type and user.extern_type != plugin_name:
-            log.debug('User %s should authenticate using %s this is %s, skipping'
-                      % (user, user.extern_type, plugin_name))
+            log.debug('User %s should authenticate using %s this is %s, skipping',
+                      user, user.extern_type, plugin_name)
 
             return False
         return True
@@ -136,15 +136,15 @@ class KallitheaAuthPluginBase(object):
         :param kwargs: extra arguments needed for user fetching.
         """
         user = None
-        log.debug('Trying to fetch user `%s` from Kallithea database'
-                  % (username))
+        log.debug('Trying to fetch user `%s` from Kallithea database',
+                  username)
         if username:
             user = User.get_by_username(username)
             if not user:
                 log.debug('Fallback to fetch user in case insensitive mode')
                 user = User.get_by_username(username, case_insensitive=True)
         else:
-            log.debug('provided username:`%s` is empty skipping...' % username)
+            log.debug('provided username:`%s` is empty skipping...', username)
         return user
 
     def settings(self):
@@ -267,8 +267,8 @@ class KallitheaExternalAuthPlugin(Kallit
             # external authentication, but if it's inactive user we shouldn't
             # create that user anyway
             if user_data['active_from_extern'] is False:
-                log.warning("User %s authenticated against %s, but is inactive"
-                            % (username, self.__module__))
+                log.warning("User %s authenticated against %s, but is inactive",
+                            username, self.__module__)
                 return None
 
             if self.use_fake_password():
@@ -276,8 +276,8 @@ class KallitheaExternalAuthPlugin(Kallit
                 # them blank either
                 passwd = PasswordGenerator().gen_password(length=8)
 
-            log.debug('Updating or creating user info from %s plugin'
-                      % self.name)
+            log.debug('Updating or creating user info from %s plugin',
+                      self.name)
             user = UserModel().create_or_update(
                 username=username,
                 password=passwd,
@@ -309,7 +309,7 @@ def importplugin(plugin):
         TypeError -- if the KallitheaAuthPlugin is not a subclass of ours KallitheaAuthPluginBase
         ImportError -- if we couldn't import the plugin at all
     """
-    log.debug("Importing %s" % plugin)
+    log.debug("Importing %s", plugin)
     if not plugin.startswith(u'kallithea.lib.auth_modules.auth_'):
         parts = plugin.split(u'.lib.auth_modules.auth_', 1)
         if len(parts) == 2:
@@ -326,8 +326,8 @@ def importplugin(plugin):
         # the plugin name, the crash is pretty bad and hard to recover
         raise
 
-    log.debug("Loaded auth plugin from %s (module:%s, file:%s)"
-              % (plugin, module.__name__, module.__file__))
+    log.debug("Loaded auth plugin from %s (module:%s, file:%s)",
+              plugin, module.__name__, module.__file__)
 
     pluginclass = getattr(module, PLUGIN_CLASS_NAME)
     if not issubclass(pluginclass, KallitheaAuthPluginBase):
@@ -362,14 +362,14 @@ def authenticate(username, password, env
     """
 
     auth_plugins = Setting.get_auth_plugins()
-    log.debug('Authentication against %s plugins' % (auth_plugins,))
+    log.debug('Authentication against %s plugins', auth_plugins)
     for module in auth_plugins:
         try:
             plugin = loadplugin(module)
         except (ImportError, AttributeError, TypeError) as e:
             raise ImportError('Failed to load authentication module %s : %s'
                               % (module, str(e)))
-        log.debug('Trying authentication using ** %s **' % (module,))
+        log.debug('Trying authentication using ** %s **', module)
         # load plugin settings from Kallithea database
         plugin_name = plugin.name
         plugin_settings = {}
@@ -377,26 +377,26 @@ def authenticate(username, password, env
             conf_key = "auth_%s_%s" % (plugin_name, v["name"])
             setting = Setting.get_by_name(conf_key)
             plugin_settings[v["name"]] = setting.app_settings_value if setting else None
-        log.debug('Plugin settings \n%s' % formatted_json(plugin_settings))
+        log.debug('Plugin settings \n%s', formatted_json(plugin_settings))
 
         if not str2bool(plugin_settings["enabled"]):
-            log.info("Authentication plugin %s is disabled, skipping for %s"
-                     % (module, username))
+            log.info("Authentication plugin %s is disabled, skipping for %s",
+                     module, username)
             continue
 
         # use plugin's method of user extraction.
         user = plugin.get_user(username, environ=environ,
                                settings=plugin_settings)
-        log.debug('Plugin %s extracted user is `%s`' % (module, user))
+        log.debug('Plugin %s extracted user is `%s`', module, user)
         if not plugin.accepts(user):
-            log.debug('Plugin %s does not accept user `%s` for authentication'
-                      % (module, user))
+            log.debug('Plugin %s does not accept user `%s` for authentication',
+                      module, user)
             continue
         else:
-            log.debug('Plugin %s accepted user `%s` for authentication'
-                      % (module, user))
+            log.debug('Plugin %s accepted user `%s` for authentication',
+                      module, user)
 
-        log.info('Authenticating user using %s plugin' % plugin.__module__)
+        log.info('Authenticating user using %s plugin', plugin.__module__)
         # _authenticate is a wrapper for .auth() method of plugin.
         # it checks if .auth() sends proper data. For KallitheaExternalAuthPlugin
         # it also maps users to Database and maps the attributes returned
@@ -405,7 +405,7 @@ def authenticate(username, password, env
         user_data = plugin._authenticate(user, username, password,
                                            plugin_settings,
                                            environ=environ or {})
-        log.debug('PLUGIN USER DATA: %s' % user_data)
+        log.debug('PLUGIN USER DATA: %s', user_data)
 
         if user_data is not None:
             log.debug('Plugin returned proper authentication data')
@@ -413,8 +413,8 @@ def authenticate(username, password, env
 
         # we failed to Auth because .auth() method didn't return the user
         if username:
-            log.warning("User `%s` failed to authenticate against %s"
-                        % (username, plugin.__module__))
+            log.warning("User `%s` failed to authenticate against %s",
+                        username, plugin.__module__)
     return None
 
 def get_managed_fields(user):
diff --git a/kallithea/lib/auth_modules/auth_container.py b/kallithea/lib/auth_modules/auth_container.py
--- a/kallithea/lib/auth_modules/auth_container.py
+++ b/kallithea/lib/auth_modules/auth_container.py
@@ -95,24 +95,24 @@ class KallitheaAuthPlugin(auth_modules.K
         username = None
         environ = environ or {}
         if not environ:
-            log.debug('got empty environ: %s' % environ)
+            log.debug('got empty environ: %s', environ)
 
         settings = settings or {}
         if settings.get('header'):
             header = settings.get('header')
             username = environ.get(header)
-            log.debug('extracted %s:%s' % (header, username))
+            log.debug('extracted %s:%s', header, username)
 
         # fallback mode
         if not username and settings.get('fallback_header'):
             header = settings.get('fallback_header')
             username = environ.get(header)
-            log.debug('extracted %s:%s' % (header, username))
+            log.debug('extracted %s:%s', header, username)
 
         if username and str2bool(settings.get('clean_username')):
-            log.debug('Received username %s from container' % username)
+            log.debug('Received username %s from container', username)
             username = self._clean_username(username)
-            log.debug('New cleanup user is: %s' % username)
+            log.debug('New cleanup user is: %s', username)
         return username
 
     def get_user(self, username=None, **kwargs):
@@ -188,7 +188,7 @@ class KallitheaAuthPlugin(auth_modules.K
             'extern_name': username,
         }
 
-        log.info('user `%s` authenticated correctly' % user_data['username'])
+        log.info('user `%s` authenticated correctly', user_data['username'])
         return user_data
 
     def get_managed_fields(self):
diff --git a/kallithea/lib/auth_modules/auth_crowd.py b/kallithea/lib/auth_modules/auth_crowd.py
--- a/kallithea/lib/auth_modules/auth_crowd.py
+++ b/kallithea/lib/auth_modules/auth_crowd.py
@@ -85,9 +85,9 @@ class CrowdServer(object):
             _headers["Authorization"] = "Basic %s" % authstring
         if headers:
             _headers.update(headers)
-        log.debug("Sent crowd: \n%s"
-                  % (formatted_json({"url": url, "body": body,
-                                           "headers": _headers})))
+        log.debug("Sent crowd: \n%s",
+                  formatted_json({"url": url, "body": body,
+                                           "headers": _headers}))
         request = urllib2.Request(url, body, _headers)
         if method:
             request.get_method = lambda: method
@@ -202,16 +202,16 @@ class KallitheaAuthPlugin(auth_modules.K
             log.debug('Empty username or password skipping...')
             return None
 
-        log.debug("Crowd settings: \n%s" % (formatted_json(settings)))
+        log.debug("Crowd settings: \n%s", formatted_json(settings))
         server = CrowdServer(**settings)
         server.set_credentials(settings["app_name"], settings["app_password"])
         crowd_user = server.user_auth(username, password)
-        log.debug("Crowd returned: \n%s" % (formatted_json(crowd_user)))
+        log.debug("Crowd returned: \n%s", formatted_json(crowd_user))
         if not crowd_user["status"]:
             return None
 
         res = server.user_groups(crowd_user["name"])
-        log.debug("Crowd groups: \n%s" % (formatted_json(res)))
+        log.debug("Crowd groups: \n%s", formatted_json(res))
         crowd_user["groups"] = [x["name"] for x in res["groups"]]
 
         # old attrs fetched from Kallithea database
@@ -237,8 +237,8 @@ class KallitheaAuthPlugin(auth_modules.K
         for group in settings["admin_groups"].split(","):
             if group in user_data["groups"]:
                 user_data["admin"] = True
-        log.debug("Final crowd user object: \n%s" % (formatted_json(user_data)))
-        log.info('user %s authenticated correctly' % user_data['username'])
+        log.debug("Final crowd user object: \n%s", formatted_json(user_data))
+        log.info('user %s authenticated correctly', user_data['username'])
         return user_data
 
     def get_managed_fields(self):
diff --git a/kallithea/lib/auth_modules/auth_internal.py b/kallithea/lib/auth_modules/auth_internal.py
--- a/kallithea/lib/auth_modules/auth_internal.py
+++ b/kallithea/lib/auth_modules/auth_internal.py
@@ -61,11 +61,11 @@ class KallitheaAuthPlugin(auth_modules.K
 
     def auth(self, userobj, username, password, settings, **kwargs):
         if not userobj:
-            log.debug('userobj was:%s skipping' % (userobj, ))
+            log.debug('userobj was:%s skipping', userobj)
             return None
         if userobj.extern_type != self.name:
-            log.warning("userobj:%s extern_type mismatch got:`%s` expected:`%s`"
-                     % (userobj, userobj.extern_type, self.name))
+            log.warning("userobj:%s extern_type mismatch got:`%s` expected:`%s`",
+                     userobj, userobj.extern_type, self.name)
             return None
 
         user_data = {
@@ -85,17 +85,17 @@ class KallitheaAuthPlugin(auth_modules.K
             from kallithea.lib import auth
             password_match = auth.KallitheaCrypto.hash_check(password, userobj.password)
             if userobj.username == User.DEFAULT_USER and userobj.active:
-                log.info('user %s authenticated correctly as anonymous user' %
+                log.info('user %s authenticated correctly as anonymous user',
                          username)
                 return user_data
 
             elif userobj.username == username and password_match:
-                log.info('user %s authenticated correctly' % user_data['username'])
+                log.info('user %s authenticated correctly', user_data['username'])
                 return user_data
-            log.error("user %s had a bad password" % username)
+            log.error("user %s had a bad password", username)
             return None
         else:
-            log.warning('user %s tried auth but is disabled' % username)
+            log.warning('user %s tried auth but is disabled', username)
             return None
 
     def get_managed_fields(self):
diff --git a/kallithea/lib/auth_modules/auth_ldap.py b/kallithea/lib/auth_modules/auth_ldap.py
--- a/kallithea/lib/auth_modules/auth_ldap.py
+++ b/kallithea/lib/auth_modules/auth_ldap.py
@@ -127,8 +127,8 @@ class AuthLdap(object):
                 server.start_tls_s()
 
             if self.LDAP_BIND_DN and self.LDAP_BIND_PASS:
-                log.debug('Trying simple_bind with password and given DN: %s'
-                          % self.LDAP_BIND_DN)
+                log.debug('Trying simple_bind with password and given DN: %s',
+                          self.LDAP_BIND_DN)
                 server.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)
 
             filter_ = '(&%s(%s=%s))' % (self.LDAP_FILTER, self.attr_login,
@@ -146,15 +146,15 @@ class AuthLdap(object):
                     continue
 
                 try:
-                    log.debug('Trying simple bind with %s' % dn)
+                    log.debug('Trying simple bind with %s', dn)
                     server.simple_bind_s(dn, safe_str(password))
                     attrs = server.search_ext_s(dn, ldap.SCOPE_BASE,
                                                 '(objectClass=*)')[0][1]
                     break
 
                 except ldap.INVALID_CREDENTIALS:
-                    log.debug("LDAP rejected password for user '%s' (%s): %s"
-                              % (uid, username, dn))
+                    log.debug("LDAP rejected password for user '%s' (%s): %s",
+                              uid, username, dn)
 
             else:
                 log.debug("No matching LDAP objects for authentication "
@@ -162,7 +162,7 @@ class AuthLdap(object):
                 raise LdapPasswordError()
 
         except ldap.NO_SUCH_OBJECT:
-            log.debug("LDAP says no such user '%s' (%s)" % (uid, username))
+            log.debug("LDAP says no such user '%s' (%s)", uid, username)
             raise LdapUsernameError()
         except ldap.SERVER_DOWN:
             raise LdapConnectionError("LDAP can't access authentication server")
@@ -328,7 +328,7 @@ class KallitheaAuthPlugin(auth_modules.K
         try:
             aldap = AuthLdap(**kwargs)
             (user_dn, ldap_attrs) = aldap.authenticate_ldap(username, password)
-            log.debug('Got ldap DN response %s' % user_dn)
+            log.debug('Got ldap DN response %s', user_dn)
 
             get_ldap_attr = lambda k: ldap_attrs.get(settings.get(k), [''])[0]
 
@@ -350,7 +350,7 @@ class KallitheaAuthPlugin(auth_modules.K
                 "active_from_extern": None,
                 'extern_name': user_dn,
             }
-            log.info('user %s authenticated correctly' % user_data['username'])
+            log.info('user %s authenticated correctly', user_data['username'])
             return user_data
 
         except (LdapUsernameError, LdapPasswordError, LdapImportError):
diff --git a/kallithea/lib/auth_modules/auth_pam.py b/kallithea/lib/auth_modules/auth_pam.py
--- a/kallithea/lib/auth_modules/auth_pam.py
+++ b/kallithea/lib/auth_modules/auth_pam.py
@@ -98,10 +98,10 @@ class KallitheaAuthPlugin(auth_modules.K
                 _pam_lock.release()
 
             if not auth_result:
-                log.error("PAM was unable to authenticate user: %s" % (username,))
+                log.error("PAM was unable to authenticate user: %s", username)
                 return None
         else:
-            log.debug("Using cached auth for user: %s" % (username,))
+            log.debug("Using cached auth for user: %s", username)
 
         # old attrs fetched from Kallithea database
         admin = getattr(userobj, 'admin', False)
@@ -133,8 +133,8 @@ class KallitheaAuthPlugin(auth_modules.K
             log.warning("Cannot extract additional info for PAM user %s", username)
             pass
 
-        log.debug("pamuser: \n%s" % formatted_json(user_data))
-        log.info('user %s authenticated correctly' % user_data['username'])
+        log.debug("pamuser: \n%s", formatted_json(user_data))
+        log.info('user %s authenticated correctly', user_data['username'])
         return user_data
 
     def get_managed_fields(self):
diff --git a/kallithea/lib/base.py b/kallithea/lib/base.py
--- a/kallithea/lib/base.py
+++ b/kallithea/lib/base.py
@@ -74,7 +74,7 @@ def _filter_proxy(ip):
     if ',' in ip:
         _ips = ip.split(',')
         _first_ip = _ips[0].strip()
-        log.debug('Got multiple IPs %s, using %s' % (','.join(_ips), _first_ip))
+        log.debug('Got multiple IPs %s, using %s', ','.join(_ips), _first_ip)
         return _first_ip
     return ip
 
@@ -224,7 +224,7 @@ class BaseVCSController(object):
         # check IP
         ip_allowed = AuthUser.check_ip_allowed(user, ip_addr)
         if ip_allowed:
-            log.info('Access for IP:%s allowed' % (ip_addr,))
+            log.info('Access for IP:%s allowed', ip_addr)
         else:
             return False
 
@@ -256,8 +256,8 @@ class BaseVCSController(object):
         if str2bool(Ui.get_by_key('push_ssl').ui_value):
             org_proto = environ.get('wsgi._org_proto', environ['wsgi.url_scheme'])
             if org_proto != 'https':
-                log.debug('proto is %s and SSL is required BAD REQUEST !'
-                          % org_proto)
+                log.debug('proto is %s and SSL is required BAD REQUEST !',
+                          org_proto)
                 return False
         return True
 
@@ -286,7 +286,7 @@ class BaseVCSController(object):
                 #check if it's already locked !, if it is compare users
                 user_id, _date = repo.locked
                 if user.user_id == user_id:
-                    log.debug('Got push from user %s, now unlocking' % (user))
+                    log.debug('Got push from user %s, now unlocking', user)
                     # unlock if we have push from user who locked
                     make_lock = False
                 else:
@@ -296,13 +296,13 @@ class BaseVCSController(object):
                 if repo.locked[0] and repo.locked[1]:
                     locked = True
                 else:
-                    log.debug('Setting lock on repo %s by %s' % (repo, user))
+                    log.debug('Setting lock on repo %s by %s', repo, user)
                     make_lock = True
 
         else:
-            log.debug('Repository %s do not have locking enabled' % (repo))
-        log.debug('FINAL locking values make_lock:%s,locked:%s,locked_by:%s'
-                  % (make_lock, locked, locked_by))
+            log.debug('Repository %s do not have locking enabled', repo)
+        log.debug('FINAL locking values make_lock:%s,locked:%s,locked_by:%s',
+                  make_lock, locked, locked_by)
         return make_lock, locked, locked_by
 
     def __call__(self, environ, start_response):
@@ -311,7 +311,7 @@ class BaseVCSController(object):
             return self._handle_request(environ, start_response)
         finally:
             log = logging.getLogger('kallithea.' + self.__class__.__name__)
-            log.debug('Request time: %.3fs' % (time.time() - start))
+            log.debug('Request time: %.3fs', time.time() - start)
             meta.Session.remove()
 
 
@@ -466,8 +466,8 @@ class BaseRepoController(BaseController)
             if not _dbr:
                 return
 
-            log.debug('Found repository in database %s with state `%s`'
-                      % (safe_unicode(_dbr), safe_unicode(_dbr.repo_state)))
+            log.debug('Found repository in database %s with state `%s`',
+                      safe_unicode(_dbr), safe_unicode(_dbr.repo_state))
             route = getattr(request.environ.get('routes.route'), 'name', '')
 
             # allow to delete repos that are somehow damages in filesystem
diff --git a/kallithea/lib/celerylib/__init__.py b/kallithea/lib/celerylib/__init__.py
--- a/kallithea/lib/celerylib/__init__.py
+++ b/kallithea/lib/celerylib/__init__.py
@@ -62,7 +62,7 @@ def run_task(task, *args, **kwargs):
     if CELERY_ON:
         try:
             t = task.apply_async(args=args, kwargs=kwargs)
-            log.info('running task %s:%s' % (t.task_id, task))
+            log.info('running task %s:%s', t.task_id, task)
             return t
 
         except socket.error as e:
@@ -76,7 +76,7 @@ def run_task(task, *args, **kwargs):
         except Exception as e:
             log.error(traceback.format_exc())
 
-    log.debug('executing task %s in sync mode' % task)
+    log.debug('executing task %s in sync mode', task)
     return ResultWrapper(task(*args, **kwargs))
 
 
@@ -96,7 +96,7 @@ def locked_task(func):
         lockkey = __get_lockkey(func, *fargs, **fkwargs)
         lockkey_path = config['app_conf']['cache_dir']
 
-        log.info('running task with lockkey %s' % lockkey)
+        log.info('running task with lockkey %s', lockkey)
         try:
             l = DaemonLock(file_=jn(lockkey_path, lockkey))
             ret = func(*fargs, **fkwargs)
diff --git a/kallithea/lib/celerylib/tasks.py b/kallithea/lib/celerylib/tasks.py
--- a/kallithea/lib/celerylib/tasks.py
+++ b/kallithea/lib/celerylib/tasks.py
@@ -87,7 +87,7 @@ def get_commits_stats(repo_name, ts_min_
                             ts_max_y)
     lockkey_path = config['app_conf']['cache_dir']
 
-    log.info('running task with lockkey %s' % lockkey)
+    log.info('running task with lockkey %s', lockkey)
 
     try:
         lock = l = DaemonLock(file_=jn(lockkey_path, lockkey))
@@ -134,15 +134,15 @@ def get_commits_stats(repo_name, ts_min_
                                         cur_stats.commit_activity_combined))
             co_day_auth_aggr = json.loads(cur_stats.commit_activity)
 
-        log.debug('starting parsing %s' % parse_limit)
+        log.debug('starting parsing %s', parse_limit)
         lmktime = mktime
 
         last_rev = last_rev + 1 if last_rev >= 0 else 0
-        log.debug('Getting revisions from %s to %s' % (
-             last_rev, last_rev + parse_limit)
+        log.debug('Getting revisions from %s to %s',
+             last_rev, last_rev + parse_limit
         )
         for cs in repo[last_rev:last_rev + parse_limit]:
-            log.debug('parsing %s' % cs)
+            log.debug('parsing %s', cs)
             last_cs = cs  # remember last parsed changeset
             k = lmktime([cs.date.timetuple()[0], cs.date.timetuple()[1],
                           cs.date.timetuple()[2], 0, 0, 0, 0, 0, 0])
@@ -210,9 +210,9 @@ def get_commits_stats(repo_name, ts_min_
         stats.commit_activity = json.dumps(co_day_auth_aggr)
         stats.commit_activity_combined = json.dumps(overview_data)
 
-        log.debug('last revision %s' % last_rev)
+        log.debug('last revision %s', last_rev)
         leftovers = len(repo.revisions[last_rev:])
-        log.debug('revisions to parse %s' % leftovers)
+        log.debug('revisions to parse %s', leftovers)
 
         if last_rev == 0 or leftovers < parse_limit:
             log.debug('getting code trending stats')
diff --git a/kallithea/lib/db_manage.py b/kallithea/lib/db_manage.py
--- a/kallithea/lib/db_manage.py
+++ b/kallithea/lib/db_manage.py
@@ -103,7 +103,7 @@ class DbManage(object):
 
         checkfirst = not override
         Base.metadata.create_all(checkfirst=checkfirst)
-        log.info('Created tables for %s' % self.dbname)
+        log.info('Created tables for %s', self.dbname)
 
     def set_db_version(self):
         ver = DbMigrateVersion()
@@ -111,7 +111,7 @@ class DbManage(object):
         ver.repository_id = DB_MIGRATIONS
         ver.repository_path = 'versions'
         self.sa.add(ver)
-        log.info('db version set to: %s' % __dbversion__)
+        log.info('db version set to: %s', __dbversion__)
 
     def upgrade(self):
         """
@@ -363,7 +363,7 @@ class DbManage(object):
         for k, v, t in [('auth_plugins', 'kallithea.lib.auth_modules.auth_internal', 'list'),
                      ('auth_internal_enabled', 'True', 'bool')]:
             if skip_existing and Setting.get_by_name(k) != None:
-                log.debug('Skipping option %s' % k)
+                log.debug('Skipping option %s', k)
                 continue
             setting = Setting(k, v, t)
             self.sa.add(setting)
@@ -379,7 +379,7 @@ class DbManage(object):
             ('default_repo_type', 'hg', 'unicode')]:
 
             if skip_existing and Setting.get_by_name(k) is not None:
-                log.debug('Skipping option %s' % k)
+                log.debug('Skipping option %s', k)
                 continue
             setting = Setting(k, v, t)
             self.sa.add(setting)
@@ -396,7 +396,7 @@ class DbManage(object):
                 .scalar()
 
             if default is None:
-                log.debug('missing default permission for group %s adding' % g)
+                log.debug('missing default permission for group %s adding', g)
                 perm_obj = RepoGroupModel()._create_default_perms(g)
                 self.sa.add(perm_obj)
 
@@ -444,20 +444,20 @@ class DbManage(object):
         # check proper dir
         if not os.path.isdir(path):
             path_ok = False
-            log.error('Given path %s is not a valid directory' % (path,))
+            log.error('Given path %s is not a valid directory', path)
 
         elif not os.path.isabs(path):
             path_ok = False
-            log.error('Given path %s is not an absolute path' % (path,))
+            log.error('Given path %s is not an absolute path', path)
 
         # check if path is at least readable.
         if not os.access(path, os.R_OK):
             path_ok = False
-            log.error('Given path %s is not readable' % (path,))
+            log.error('Given path %s is not readable', path)
 
         # check write access, warn user about non writeable paths
         elif not os.access(path, os.W_OK) and path_ok:
-            log.warning('No write permission to given path %s' % (path,))
+            log.warning('No write permission to given path %s', path)
             if not ask_ok('Given path %s is not writeable, do you want to '
                           'continue with read only mode ? [y/n]' % (path,)):
                 log.error('Canceled by user')
@@ -472,7 +472,7 @@ class DbManage(object):
         real_path = os.path.normpath(os.path.realpath(path))
 
         if real_path != os.path.normpath(path):
-            log.warning('Using normalized path %s instead of %s' % (real_path, path))
+            log.warning('Using normalized path %s instead of %s', real_path, path)
 
         return real_path
 
@@ -520,7 +520,7 @@ class DbManage(object):
         log.info('created ui config')
 
     def create_user(self, username, password, email='', admin=False):
-        log.info('creating user %s' % username)
+        log.info('creating user %s', username)
         UserModel().create_or_update(username, password, email,
                                      firstname='Kallithea', lastname='Admin',
                                      active=True, admin=admin,
diff --git a/kallithea/lib/dbmigrate/migrate/versioning/migrate_repository.py b/kallithea/lib/dbmigrate/migrate/versioning/migrate_repository.py
--- a/kallithea/lib/dbmigrate/migrate/versioning/migrate_repository.py
+++ b/kallithea/lib/dbmigrate/migrate/versioning/migrate_repository.py
@@ -25,13 +25,13 @@ def usage():
 
 def delete_file(filepath):
     """Deletes a file and prints a message."""
-    log.info('Deleting file: %s' % filepath)
+    log.info('Deleting file: %s', filepath)
     os.remove(filepath)
 
 
 def move_file(src, tgt):
     """Moves a file and prints a message."""
-    log.info('Moving file %s to %s' % (src, tgt))
+    log.info('Moving file %s to %s', src, tgt)
     if os.path.exists(tgt):
         raise Exception(
             'Cannot move file %s because target %s already exists' % \
@@ -41,13 +41,13 @@ def move_file(src, tgt):
 
 def delete_directory(dirpath):
     """Delete a directory and print a message."""
-    log.info('Deleting directory: %s' % dirpath)
+    log.info('Deleting directory: %s', dirpath)
     os.rmdir(dirpath)
 
 
 def migrate_repository(repos):
     """Does the actual migration to the new repository format."""
-    log.info('Migrating repository at: %s to new format' % repos)
+    log.info('Migrating repository at: %s to new format', repos)
     versions = '%s/versions' % repos
     dirs = os.listdir(versions)
     # Only use int's in list.
@@ -55,7 +55,7 @@ def migrate_repository(repos):
     numdirs.sort()  # Sort list.
     for dirname in numdirs:
         origdir = '%s/%s' % (versions, dirname)
-        log.info('Working on directory: %s' % origdir)
+        log.info('Working on directory: %s', origdir)
         files = os.listdir(origdir)
         files.sort()
         for filename in files:
diff --git a/kallithea/lib/dbmigrate/migrate/versioning/pathed.py b/kallithea/lib/dbmigrate/migrate/versioning/pathed.py
--- a/kallithea/lib/dbmigrate/migrate/versioning/pathed.py
+++ b/kallithea/lib/dbmigrate/migrate/versioning/pathed.py
@@ -35,7 +35,7 @@ class Pathed(KeyedInstance):
         """Try to initialize this object's parent, if it has one"""
         parent_path = self.__class__._parent_path(path)
         self.parent = self.__class__.parent(parent_path)
-        log.debug("Getting parent %r:%r" % (self.__class__.parent, parent_path))
+        log.debug("Getting parent %r:%r", self.__class__.parent, parent_path)
         self.parent._init_child(path, self)
 
     def _init_child(self, child, path):
diff --git a/kallithea/lib/dbmigrate/migrate/versioning/repository.py b/kallithea/lib/dbmigrate/migrate/versioning/repository.py
--- a/kallithea/lib/dbmigrate/migrate/versioning/repository.py
+++ b/kallithea/lib/dbmigrate/migrate/versioning/repository.py
@@ -74,14 +74,14 @@ class Repository(pathed.Pathed):
     _versions = 'versions'
 
     def __init__(self, path):
-        log.debug('Loading repository %s...' % path)
+        log.debug('Loading repository %s...', path)
         self.verify(path)
         super(Repository, self).__init__(path)
         self.config = cfgparse.Config(os.path.join(self.path, self._config))
         self.versions = version.Collection(os.path.join(self.path,
                                                       self._versions))
-        log.debug('Repository %s loaded successfully' % path)
-        log.debug('Config: %r' % self.config.to_dict())
+        log.debug('Repository %s loaded successfully', path)
+        log.debug('Config: %r', self.config.to_dict())
 
     @classmethod
     def verify(cls, path):
diff --git a/kallithea/lib/dbmigrate/migrate/versioning/script/base.py b/kallithea/lib/dbmigrate/migrate/versioning/script/base.py
--- a/kallithea/lib/dbmigrate/migrate/versioning/script/base.py
+++ b/kallithea/lib/dbmigrate/migrate/versioning/script/base.py
@@ -24,10 +24,10 @@ class BaseScript(pathed.Pathed):
     """ # TODO: sphinxfy this and implement it correctly
 
     def __init__(self, path):
-        log.debug('Loading script %s...' % path)
+        log.debug('Loading script %s...', path)
         self.verify(path)
         super(BaseScript, self).__init__(path)
-        log.debug('Script %s loaded successfully' % path)
+        log.debug('Script %s loaded successfully', path)
 
     @classmethod
     def verify(cls, path):
diff --git a/kallithea/lib/dbmigrate/schema/db_1_2_0.py b/kallithea/lib/dbmigrate/schema/db_1_2_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_2_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_2_0.py
@@ -323,7 +323,7 @@ class User(Base, BaseModel):
         self.last_login = datetime.datetime.now()
         Session.add(self)
         Session.commit()
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def create(cls, form_data):
@@ -698,7 +698,7 @@ class Repository(Base, BaseModel):
 
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -785,7 +785,7 @@ class Group(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1060,7 +1060,7 @@ class CacheInvalidation(Base, BaseModel)
         :param key:
         """
 
-        log.debug('marking %s for invalidation' % key)
+        log.debug('marking %s for invalidation', key)
         inv_obj = Session.query(cls)\
             .filter(cls.cache_key == key).scalar()
         if inv_obj:
diff --git a/kallithea/lib/dbmigrate/schema/db_1_3_0.py b/kallithea/lib/dbmigrate/schema/db_1_3_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_3_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_3_0.py
@@ -391,7 +391,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session.add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def __json__(self):
         return dict(
@@ -716,7 +716,7 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -813,7 +813,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1151,8 +1151,8 @@ class CacheInvalidation(Base, BaseModel)
 
         key, _prefix, _org_key = cls._get_key(key)
         inv_objs = Session.query(cls).filter(cls.cache_args == _org_key).all()
-        log.debug('marking %s key[s] %s for invalidation' % (len(inv_objs),
-                                                             _org_key))
+        log.debug('marking %s key[s] %s for invalidation', len(inv_objs),
+                                                             _org_key)
         try:
             for inv_obj in inv_objs:
                 if inv_obj:
diff --git a/kallithea/lib/dbmigrate/schema/db_1_4_0.py b/kallithea/lib/dbmigrate/schema/db_1_4_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_4_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_4_0.py
@@ -437,7 +437,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def get_api_data(self):
         """
@@ -863,7 +863,7 @@ class Repository(Base, BaseModel):
         if last_change is None:
             last_change = datetime.datetime.now()
         if self.updated_on is None or self.updated_on != last_change:
-            log.debug('updated repo %s with new date %s' % (self, last_change))
+            log.debug('updated repo %s with new date %s', self, last_change)
             self.updated_on = last_change
             Session().add(self)
             Session().commit()
@@ -977,7 +977,7 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1081,7 +1081,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1505,8 +1505,8 @@ class CacheInvalidation(Base, BaseModel)
         elif repo_name:
             inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
 
-        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s'
-                  % (len(inv_objs), key, repo_name))
+        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s',
+                  len(inv_objs), key, repo_name)
         try:
             for inv_obj in inv_objs:
                 inv_obj.cache_active = False
diff --git a/kallithea/lib/dbmigrate/schema/db_1_5_0.py b/kallithea/lib/dbmigrate/schema/db_1_5_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_5_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_5_0.py
@@ -455,7 +455,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def get_api_data(self):
         """
@@ -882,7 +882,7 @@ class Repository(Base, BaseModel):
         if last_change is None:
             last_change = datetime.datetime.now()
         if self.updated_on is None or self.updated_on != last_change:
-            log.debug('updated repo %s with new date %s' % (self, last_change))
+            log.debug('updated repo %s with new date %s', self, last_change)
             self.updated_on = last_change
             Session().add(self)
             Session().commit()
@@ -996,7 +996,7 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1100,7 +1100,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1532,8 +1532,8 @@ class CacheInvalidation(Base, BaseModel)
         elif repo_name:
             inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
 
-        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s'
-                  % (len(inv_objs), key, repo_name))
+        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s',
+                  len(inv_objs), key, repo_name)
         try:
             for inv_obj in inv_objs:
                 inv_obj.cache_active = False
diff --git a/kallithea/lib/dbmigrate/schema/db_1_5_2.py b/kallithea/lib/dbmigrate/schema/db_1_5_2.py
--- a/kallithea/lib/dbmigrate/schema/db_1_5_2.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_5_2.py
@@ -462,7 +462,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def get_api_data(self):
         """
@@ -995,15 +995,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1117,7 +1117,7 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1221,7 +1221,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1645,8 +1645,8 @@ class CacheInvalidation(Base, BaseModel)
         elif repo_name:
             inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
 
-        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s'
-                  % (len(inv_objs), key, repo_name))
+        log.debug('marking %s key[s] for invalidation based on key=%s,repo_name=%s',
+                  len(inv_objs), key, repo_name)
         try:
             for inv_obj in inv_objs:
                 inv_obj.cache_active = False
diff --git a/kallithea/lib/dbmigrate/schema/db_1_6_0.py b/kallithea/lib/dbmigrate/schema/db_1_6_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_6_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_6_0.py
@@ -491,7 +491,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def get_api_data(self):
         """
@@ -1065,15 +1065,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1192,8 +1192,8 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1296,7 +1296,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1723,8 +1723,8 @@ class CacheInvalidation(Base, BaseModel)
         try:
             for inv_obj in inv_objs:
                 inv_obj.cache_active = False
-                log.debug('marking %s key for invalidation based on key=%s,repo_name=%s'
-                  % (inv_obj, key, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on key=%s,repo_name=%s',
+                  inv_obj, key, safe_str(repo_name))
                 invalidated_keys.append(inv_obj.cache_key)
                 Session().add(inv_obj)
             Session().commit()
diff --git a/kallithea/lib/dbmigrate/schema/db_1_7_0.py b/kallithea/lib/dbmigrate/schema/db_1_7_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_7_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_7_0.py
@@ -493,7 +493,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1096,15 +1096,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1199,18 +1199,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1314,7 +1314,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1828,8 +1828,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 inv_obj.cache_active = False
                 Session().add(inv_obj)
             Session().commit()
diff --git a/kallithea/lib/dbmigrate/schema/db_1_8_0.py b/kallithea/lib/dbmigrate/schema/db_1_8_0.py
--- a/kallithea/lib/dbmigrate/schema/db_1_8_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_1_8_0.py
@@ -516,7 +516,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1126,15 +1126,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1229,18 +1229,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1344,7 +1344,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1874,8 +1874,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 inv_obj.cache_active = False
                 Session().add(inv_obj)
             Session().commit()
diff --git a/kallithea/lib/dbmigrate/schema/db_2_0_0.py b/kallithea/lib/dbmigrate/schema/db_2_0_0.py
--- a/kallithea/lib/dbmigrate/schema/db_2_0_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_0_0.py
@@ -568,7 +568,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1183,15 +1183,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1286,18 +1286,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1401,7 +1401,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1931,8 +1931,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/schema/db_2_0_1.py b/kallithea/lib/dbmigrate/schema/db_2_0_1.py
--- a/kallithea/lib/dbmigrate/schema/db_2_0_1.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_0_1.py
@@ -568,7 +568,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1182,15 +1182,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1285,18 +1285,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1402,7 +1402,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1932,8 +1932,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/schema/db_2_0_2.py b/kallithea/lib/dbmigrate/schema/db_2_0_2.py
--- a/kallithea/lib/dbmigrate/schema/db_2_0_2.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_0_2.py
@@ -568,7 +568,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1202,15 +1202,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1305,18 +1305,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1423,7 +1423,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1953,8 +1953,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/schema/db_2_1_0.py b/kallithea/lib/dbmigrate/schema/db_2_1_0.py
--- a/kallithea/lib/dbmigrate/schema/db_2_1_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_1_0.py
@@ -583,7 +583,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1241,15 +1241,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1344,18 +1344,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1462,7 +1462,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1992,8 +1992,8 @@ class CacheInvalidation(Base, BaseModel)
 
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/schema/db_2_2_0.py b/kallithea/lib/dbmigrate/schema/db_2_2_0.py
--- a/kallithea/lib/dbmigrate/schema/db_2_2_0.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_2_0.py
@@ -610,7 +610,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1287,15 +1287,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1390,18 +1390,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1512,7 +1512,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -2042,11 +2042,11 @@ class CacheInvalidation(Base, BaseModel)
         Mark all caches of a repo as invalid in the database.
         """
         inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
-        log.debug('for repo %s got %s invalidation objects' % (repo_name, inv_objs))
+        log.debug('for repo %s got %s invalidation objects', repo_name, inv_objs)
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/schema/db_2_2_3.py b/kallithea/lib/dbmigrate/schema/db_2_2_3.py
--- a/kallithea/lib/dbmigrate/schema/db_2_2_3.py
+++ b/kallithea/lib/dbmigrate/schema/db_2_2_3.py
@@ -610,7 +610,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1314,15 +1314,15 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes',
+                      self.repo_name)
 
     @property
     def tip(self):
@@ -1417,18 +1417,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting obj for %s from cache' % (rn))
+            log.debug('Getting obj for %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository from %s'
-                      % (alias, repo_full_path))
+            log.debug('Creating instance of %s repository from %s',
+                      alias, repo_full_path)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -1539,7 +1539,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinite loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -2087,12 +2087,12 @@ class CacheInvalidation(Base, BaseModel)
         Mark all caches of a repo as invalid in the database.
         """
         inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
-        log.debug('for repo %s got %s invalidation objects'
-                  % (safe_str(repo_name), inv_objs))
+        log.debug('for repo %s got %s invalidation objects',
+                  safe_str(repo_name), inv_objs)
         try:
             for inv_obj in inv_objs:
-                log.debug('marking %s key for invalidation based on repo_name=%s'
-                          % (inv_obj, safe_str(repo_name)))
+                log.debug('marking %s key for invalidation based on repo_name=%s',
+                          inv_obj, safe_str(repo_name))
                 if delete:
                     Session().delete(inv_obj)
                 else:
diff --git a/kallithea/lib/dbmigrate/versions/001_initial_release.py b/kallithea/lib/dbmigrate/versions/001_initial_release.py
--- a/kallithea/lib/dbmigrate/versions/001_initial_release.py
+++ b/kallithea/lib/dbmigrate/versions/001_initial_release.py
@@ -76,7 +76,7 @@ class User(Base):
             self.last_login = datetime.datetime.now()
             session.add(self)
             session.commit()
-            log.debug('updated user %s lastlogin' % self.username)
+            log.debug('updated user %s lastlogin', self.username)
         except (DatabaseError,):
             session.rollback()
 
diff --git a/kallithea/lib/dbmigrate/versions/008_version_1_5_0.py b/kallithea/lib/dbmigrate/versions/008_version_1_5_0.py
--- a/kallithea/lib/dbmigrate/versions/008_version_1_5_0.py
+++ b/kallithea/lib/dbmigrate/versions/008_version_1_5_0.py
@@ -90,7 +90,7 @@ def fixups(models, _SESSION):
     perms = models.UserToPerm.query().filter(models.UserToPerm.user == user).all()
     defined_perms_groups = map(_get_group,
                               (x.permission.permission_name for x in perms))
-    log.debug('GOT ALREADY DEFINED:%s' % perms)
+    log.debug('GOT ALREADY DEFINED:%s', perms)
     DEFAULT_PERMS = models.Permission.DEFAULT_USER_PERMISSIONS
 
     # for every default permission that needs to be created, we check if
@@ -98,8 +98,8 @@ def fixups(models, _SESSION):
     for perm_name in DEFAULT_PERMS:
         gr = _get_group(perm_name)
         if gr not in defined_perms_groups:
-            log.debug('GR:%s not found, creating permission %s'
-                      % (gr, perm_name))
+            log.debug('GR:%s not found, creating permission %s',
+                      gr, perm_name)
             new_perm = _make_perm(perm_name)
             _SESSION().add(new_perm)
     _SESSION().commit()
@@ -115,7 +115,7 @@ def fixups(models, _SESSION):
         ('default_repo_type', 'hg')]:
 
         if skip_existing and models.Setting.get_by_name(k) is not None:
-            log.debug('Skipping option %s' % k)
+            log.debug('Skipping option %s', k)
             continue
         setting = models.Setting(k, v)
         _SESSION().add(setting)
diff --git a/kallithea/lib/dbmigrate/versions/012_version_1_7_0.py b/kallithea/lib/dbmigrate/versions/012_version_1_7_0.py
--- a/kallithea/lib/dbmigrate/versions/012_version_1_7_0.py
+++ b/kallithea/lib/dbmigrate/versions/012_version_1_7_0.py
@@ -93,7 +93,7 @@ def fixups(models, _SESSION):
     perms = models.UserToPerm.query().filter(models.UserToPerm.user == user).all()
     defined_perms_groups = map(_get_group,
                               (x.permission.permission_name for x in perms))
-    log.debug('GOT ALREADY DEFINED:%s' % perms)
+    log.debug('GOT ALREADY DEFINED:%s', perms)
     DEFAULT_PERMS = models.Permission.DEFAULT_USER_PERMISSIONS
 
     # for every default permission that needs to be created, we check if
@@ -101,8 +101,8 @@ def fixups(models, _SESSION):
     for perm_name in DEFAULT_PERMS:
         gr = _get_group(perm_name)
         if gr not in defined_perms_groups:
-            log.debug('GR:%s not found, creating permission %s'
-                      % (gr, perm_name))
+            log.debug('GR:%s not found, creating permission %s',
+                      gr, perm_name)
             new_perm = _make_perm(perm_name)
             _SESSION().add(new_perm)
     _SESSION().commit()
diff --git a/kallithea/lib/helpers.py b/kallithea/lib/helpers.py
--- a/kallithea/lib/helpers.py
+++ b/kallithea/lib/helpers.py
@@ -646,7 +646,7 @@ def action_parser(user_log, feed=False, 
                         _rev = repo.get_changeset(rev)
                         revs.append(_rev)
                     except ChangesetDoesNotExistError:
-                        log.error('cannot find revision %s in this repo' % rev)
+                        log.error('cannot find revision %s in this repo', rev)
                         revs.append(rev)
                 else:
                     _rev = AttributeDict({
@@ -1324,17 +1324,17 @@ def urlify_issues(newtext, repository, l
     ]
 
     if valid_indices:
-        log.debug('found issue server suffixes `%s` during valuation of: %s'
-                  % (','.join(valid_indices), newtext))
+        log.debug('found issue server suffixes `%s` during valuation of: %s',
+                  ','.join(valid_indices), newtext)
 
     for pattern_index in valid_indices:
         ISSUE_PATTERN = conf.get('issue_pat%s' % pattern_index)
         ISSUE_SERVER_LNK = conf.get('issue_server_link%s' % pattern_index)
         ISSUE_PREFIX = conf.get('issue_prefix%s' % pattern_index)
 
-        log.debug('pattern suffix `%s` PAT:%s SERVER_LINK:%s PREFIX:%s'
-                  % (pattern_index, ISSUE_PATTERN, ISSUE_SERVER_LNK,
-                     ISSUE_PREFIX))
+        log.debug('pattern suffix `%s` PAT:%s SERVER_LINK:%s PREFIX:%s',
+                  pattern_index, ISSUE_PATTERN, ISSUE_SERVER_LNK,
+                     ISSUE_PREFIX)
 
         URL_PAT = re.compile(ISSUE_PATTERN)
 
@@ -1363,7 +1363,7 @@ def urlify_issues(newtext, repository, l
                  'serv': ISSUE_SERVER_LNK,
                 }
         newtext = URL_PAT.sub(url_func, newtext)
-        log.debug('processed prefix:`%s` => %s' % (pattern_index, newtext))
+        log.debug('processed prefix:`%s` => %s', pattern_index, newtext)
 
     # if we actually did something above
     if link_:
diff --git a/kallithea/lib/indexers/__init__.py b/kallithea/lib/indexers/__init__.py
--- a/kallithea/lib/indexers/__init__.py
+++ b/kallithea/lib/indexers/__init__.py
@@ -138,7 +138,7 @@ class WhooshResultWrapper(object):
 
     def get_full_content(self, docid):
         res = self.searcher.stored_fields(docid[0])
-        log.debug('result: %s' % res)
+        log.debug('result: %s', res)
         if self.search_type == 'content':
             full_repo_path = jn(self.repo_location, res['repository'])
             f_path = res['path'].split(full_repo_path)[-1]
@@ -156,7 +156,7 @@ class WhooshResultWrapper(object):
         elif self.search_type == 'message':
             res.update({'message_hl': self.highlight(res['message'])})
 
-        log.debug('result: %s' % res)
+        log.debug('result: %s', res)
 
         return res
 
diff --git a/kallithea/lib/indexers/daemon.py b/kallithea/lib/indexers/daemon.py
--- a/kallithea/lib/indexers/daemon.py
+++ b/kallithea/lib/indexers/daemon.py
@@ -182,11 +182,11 @@ class WhooshIndexingDaemon(object):
                             'replacing with empty content' % path)
                 u_content = u''
             else:
-                log.debug('    >> %s [WITH CONTENT]' % path)
+                log.debug('    >> %s [WITH CONTENT]', path)
                 indexed_w_content += 1
 
         else:
-            log.debug('    >> %s' % path)
+            log.debug('    >> %s', path)
             # just index file name without it's content
             u_content = u''
             indexed += 1
@@ -221,14 +221,14 @@ class WhooshIndexingDaemon(object):
         if start_rev is None:
             start_rev = repo[0].raw_id
 
-        log.debug('indexing changesets in %s starting at rev: %s' %
-                  (repo_name, start_rev))
+        log.debug('indexing changesets in %s starting at rev: %s',
+                  repo_name, start_rev)
 
         indexed = 0
         cs_iter = repo.get_changesets(start=start_rev)
         total = len(cs_iter)
         for cs in cs_iter:
-            log.debug('    >> %s/%s' % (cs, total))
+            log.debug('    >> %s/%s', cs, total)
             writer.add_document(
                 raw_id=unicode(cs.raw_id),
                 owner=unicode(repo.contact),
@@ -244,7 +244,7 @@ class WhooshIndexingDaemon(object):
             )
             indexed += 1
 
-        log.debug('indexed %d changesets for repo %s' % (indexed, repo_name))
+        log.debug('indexed %d changesets for repo %s', indexed, repo_name)
         return indexed
 
     def index_files(self, file_idx_writer, repo_name, repo):
@@ -256,16 +256,16 @@ class WhooshIndexingDaemon(object):
         :param repo: instance of vcs repo
         """
         i_cnt = iwc_cnt = 0
-        log.debug('building index for %s @revision:%s' % (repo.path,
-                                                self._get_index_revision(repo)))
+        log.debug('building index for %s @revision:%s', repo.path,
+                                                self._get_index_revision(repo))
         index_rev = self._get_index_revision(repo)
         for idx_path in self.get_paths(repo):
             i, iwc = self.add_doc(file_idx_writer, idx_path, repo, repo_name, index_rev)
             i_cnt += i
             iwc_cnt += iwc
 
-        log.debug('added %s files %s with content for repo %s' %
-                  (i_cnt + iwc_cnt, iwc_cnt, repo.path))
+        log.debug('added %s files %s with content for repo %s',
+                  i_cnt + iwc_cnt, iwc_cnt, repo.path)
         return i_cnt, iwc_cnt
 
     def update_changeset_index(self):
@@ -311,8 +311,8 @@ class WhooshIndexingDaemon(object):
                         indexed_total += self.index_changesets(writer,
                                                 repo_name, repo, start_id)
                         writer_is_dirty = True
-                log.debug('indexed %s changesets for repo %s' % (
-                          indexed_total, repo_name)
+                log.debug('indexed %s changesets for repo %s',
+                          indexed_total, repo_name
                 )
             finally:
                 if writer_is_dirty:
@@ -357,8 +357,8 @@ class WhooshIndexingDaemon(object):
                             # The file has changed, delete it and add it to
                             # the list of files to reindex
                             log.debug(
-                                'adding to reindex list %s mtime: %s vs %s' % (
-                                    indexed_path, mtime, indexed_time)
+                                'adding to reindex list %s mtime: %s vs %s',
+                                    indexed_path, mtime, indexed_time
                             )
                             writer.delete_by_term('fileid', indexed_path)
                             writer_is_dirty = True
@@ -366,7 +366,7 @@ class WhooshIndexingDaemon(object):
                             to_index.add(indexed_path)
                     except (ChangesetError, NodeDoesNotExistError):
                         # This file was deleted since it was indexed
-                        log.debug('removing from index %s' % indexed_path)
+                        log.debug('removing from index %s', indexed_path)
                         writer.delete_by_term('path', indexed_path)
                         writer_is_dirty = True
 
@@ -389,16 +389,16 @@ class WhooshIndexingDaemon(object):
                         # that wasn't indexed before. So index it!
                         i, iwc = self.add_doc(writer, path, repo, repo_name)
                         writer_is_dirty = True
-                        log.debug('re indexing %s' % path)
+                        log.debug('re indexing %s', path)
                         ri_cnt += i
                         ri_cnt_total += 1
                         riwc_cnt += iwc
                         riwc_cnt_total += iwc
-                log.debug('added %s files %s with content for repo %s' % (
-                             ri_cnt + riwc_cnt, riwc_cnt, repo.path)
+                log.debug('added %s files %s with content for repo %s',
+                             ri_cnt + riwc_cnt, riwc_cnt, repo.path
                 )
-            log.debug('indexed %s files in total and %s with content' % (
-                        ri_cnt_total, riwc_cnt_total)
+            log.debug('indexed %s files in total and %s with content',
+                        ri_cnt_total, riwc_cnt_total
             )
         finally:
             if writer_is_dirty:
diff --git a/kallithea/lib/middleware/pygrack.py b/kallithea/lib/middleware/pygrack.py
--- a/kallithea/lib/middleware/pygrack.py
+++ b/kallithea/lib/middleware/pygrack.py
@@ -69,7 +69,7 @@ class GitRepository(object):
 
         git_command = request.GET.get('service')
         if git_command not in self.commands:
-            log.debug('command %s not allowed' % git_command)
+            log.debug('command %s not allowed', git_command)
             return exc.HTTPMethodNotAllowed()
 
         # note to self:
@@ -108,7 +108,7 @@ class GitRepository(object):
         _git_path = kallithea.CONFIG.get('git_path', 'git')
         git_command = self._get_fixedpath(request.path_info)
         if git_command not in self.commands:
-            log.debug('command %s not allowed' % git_command)
+            log.debug('command %s not allowed', git_command)
             return exc.HTTPMethodNotAllowed()
 
         if 'CONTENT_LENGTH' in environ:
diff --git a/kallithea/lib/middleware/simplegit.py b/kallithea/lib/middleware/simplegit.py
--- a/kallithea/lib/middleware/simplegit.py
+++ b/kallithea/lib/middleware/simplegit.py
@@ -55,8 +55,8 @@ GIT_PROTO_PAT = re.compile(r'^/(.+)/(inf
 def is_git(environ):
     path_info = environ['PATH_INFO']
     isgit_path = GIT_PROTO_PAT.match(path_info)
-    log.debug('pathinfo: %s detected as Git %s' % (
-        path_info, isgit_path is not None)
+    log.debug('pathinfo: %s detected as Git %s',
+        path_info, isgit_path is not None
     )
     return isgit_path
 
@@ -80,7 +80,7 @@ class SimpleGit(BaseVCSController):
         #======================================================================
         try:
             repo_name = self.__get_repository(environ)
-            log.debug('Extracted repo name is %s' % repo_name)
+            log.debug('Extracted repo name is %s', repo_name)
         except Exception:
             return HTTPInternalServerError()(environ, start_response)
 
@@ -126,7 +126,7 @@ class SimpleGit(BaseVCSController):
                 pre_auth = auth_modules.authenticate('', '', environ)
                 if pre_auth is not None and pre_auth.get('username'):
                     username = pre_auth['username']
-                log.debug('PRE-AUTH got %s as username' % username)
+                log.debug('PRE-AUTH got %s as username', username)
 
                 # If not authenticated by the container, running basic auth
                 if not username:
@@ -178,7 +178,7 @@ class SimpleGit(BaseVCSController):
         #===================================================================
         str_repo_name = safe_str(repo_name)
         repo_path = os.path.join(safe_str(self.basepath),str_repo_name)
-        log.debug('Repository path is %s' % repo_path)
+        log.debug('Repository path is %s', repo_path)
 
         # CHECK LOCKING only if it's not ANONYMOUS USER
         if username != User.DEFAULT_USER:
@@ -194,19 +194,19 @@ class SimpleGit(BaseVCSController):
                            'locked_by': locked_by})
 
         fix_PATH()
-        log.debug('HOOKS extras is %s' % extras)
+        log.debug('HOOKS extras is %s', extras)
         baseui = make_ui('db')
         self.__inject_extras(repo_path, baseui, extras)
 
         try:
             self._handle_githooks(repo_name, action, baseui, environ)
-            log.info('%s action on Git repo "%s" by "%s" from %s' %
-                     (action, str_repo_name, safe_str(username), ip_addr))
+            log.info('%s action on Git repo "%s" by "%s" from %s',
+                     action, str_repo_name, safe_str(username), ip_addr)
             app = self.__make_app(repo_name, repo_path, extras)
             return app(environ, start_response)
         except HTTPLockedRC as e:
             _code = CONFIG.get('lock_ret_code')
-            log.debug('Repository LOCKED ret code %s!' % (_code))
+            log.debug('Repository LOCKED ret code %s!', _code)
             return e(environ, start_response)
         except Exception:
             log.error(traceback.format_exc())
diff --git a/kallithea/lib/middleware/simplehg.py b/kallithea/lib/middleware/simplehg.py
--- a/kallithea/lib/middleware/simplehg.py
+++ b/kallithea/lib/middleware/simplehg.py
@@ -60,8 +60,8 @@ def is_mercurial(environ):
     else:
         ishg_path = False
 
-    log.debug('pathinfo: %s detected as Mercurial %s' % (
-        path_info, ishg_path)
+    log.debug('pathinfo: %s detected as Mercurial %s',
+        path_info, ishg_path
     )
     return ishg_path
 
@@ -84,7 +84,7 @@ class SimpleHg(BaseVCSController):
         #======================================================================
         try:
             repo_name = environ['REPO_NAME'] = self.__get_repository(environ)
-            log.debug('Extracted repo name is %s' % repo_name)
+            log.debug('Extracted repo name is %s', repo_name)
         except Exception:
             return HTTPInternalServerError()(environ, start_response)
 
@@ -130,7 +130,7 @@ class SimpleHg(BaseVCSController):
                 pre_auth = auth_modules.authenticate('', '', environ)
                 if pre_auth is not None and pre_auth.get('username'):
                     username = pre_auth['username']
-                log.debug('PRE-AUTH got %s as username' % username)
+                log.debug('PRE-AUTH got %s as username', username)
 
                 # If not authenticated by the container, running basic auth
                 if not username:
@@ -181,7 +181,7 @@ class SimpleHg(BaseVCSController):
         #======================================================================
         str_repo_name = safe_str(repo_name)
         repo_path = os.path.join(safe_str(self.basepath), str_repo_name)
-        log.debug('Repository path is %s' % repo_path)
+        log.debug('Repository path is %s', repo_path)
 
         # CHECK LOCKING only if it's not ANONYMOUS USER
         if username != User.DEFAULT_USER:
@@ -197,13 +197,13 @@ class SimpleHg(BaseVCSController):
                            'locked_by': locked_by})
 
         fix_PATH()
-        log.debug('HOOKS extras is %s' % extras)
+        log.debug('HOOKS extras is %s', extras)
         baseui = make_ui('db')
         self.__inject_extras(repo_path, baseui, extras)
 
         try:
-            log.info('%s action on Mercurial repo "%s" by "%s" from %s' %
-                     (action, str_repo_name, safe_str(username), ip_addr))
+            log.info('%s action on Mercurial repo "%s" by "%s" from %s',
+                     action, str_repo_name, safe_str(username), ip_addr)
             app = self.__make_app(repo_path, baseui, extras)
             return app(environ, start_response)
         except RepoError as e:
@@ -211,7 +211,7 @@ class SimpleHg(BaseVCSController):
                 return HTTPNotFound()(environ, start_response)
         except HTTPLockedRC as e:
             _code = CONFIG.get('lock_ret_code')
-            log.debug('Repository LOCKED ret code %s!' % (_code))
+            log.debug('Repository LOCKED ret code %s!', _code)
             return e(environ, start_response)
         except Exception:
             log.error(traceback.format_exc())
diff --git a/kallithea/lib/paster_commands/repo_scan.py b/kallithea/lib/paster_commands/repo_scan.py
--- a/kallithea/lib/paster_commands/repo_scan.py
+++ b/kallithea/lib/paster_commands/repo_scan.py
@@ -62,7 +62,7 @@ class Command(BasePasterCommand):
                                         remove_obsolete=rm_obsolete)
         added = ', '.join(added) or '-'
         removed = ', '.join(removed) or '-'
-        log.info('Scan completed added: %s removed: %s' % (added, removed))
+        log.info('Scan completed added: %s removed: %s', added, removed)
 
     def update_parser(self):
         self.parser.add_option(
diff --git a/kallithea/lib/utils.py b/kallithea/lib/utils.py
--- a/kallithea/lib/utils.py
+++ b/kallithea/lib/utils.py
@@ -202,8 +202,8 @@ def action_logger(user, action, repo, ip
     user_log.user_ip = ipaddr
     sa.add(user_log)
 
-    log.info('Logging action:%s on %s by user:%s ip:%s' %
-             (action, safe_unicode(repo), user_obj, ipaddr))
+    log.info('Logging action:%s on %s by user:%s ip:%s',
+             action, safe_unicode(repo), user_obj, ipaddr)
     if commit:
         sa.commit()
 
@@ -218,14 +218,14 @@ def get_filesystem_repos(path, recursive
 
     # remove ending slash for better results
     path = path.rstrip(os.sep)
-    log.debug('now scanning in %s location recursive:%s...' % (path, recursive))
+    log.debug('now scanning in %s location recursive:%s...', path, recursive)
 
     def _get_repos(p):
         if not os.access(p, os.R_OK) or not os.access(p, os.X_OK):
-            log.warning('ignoring repo path without access: %s' % (p,))
+            log.warning('ignoring repo path without access: %s', p)
             return
         if not os.access(p, os.W_OK):
-            log.warning('repo path without write access: %s' % (p,))
+            log.warning('repo path without write access: %s', p)
         for dirpath in os.listdir(p):
             if os.path.isfile(os.path.join(p, dirpath)):
                 continue
@@ -350,14 +350,14 @@ def make_ui(read_from='file', path=None,
 
     if read_from == 'file':
         if not os.path.isfile(path):
-            log.debug('hgrc file is not present at %s, skipping...' % path)
+            log.debug('hgrc file is not present at %s, skipping...', path)
             return False
-        log.debug('reading hgrc from %s' % path)
+        log.debug('reading hgrc from %s', path)
         cfg = config.config()
         cfg.read(path)
         for section in ui_sections:
             for k, v in cfg.items(section):
-                log.debug('settings ui from file: [%s] %s=%s' % (section, k, v))
+                log.debug('settings ui from file: [%s] %s=%s', section, k, v)
                 baseui.setconfig(safe_str(section), safe_str(k), safe_str(v))
 
     elif read_from == 'db':
@@ -448,8 +448,8 @@ def map_groups(path):
             break
 
         if group is None:
-            log.debug('creating group level: %s group_name: %s'
-                      % (lvl, group_name))
+            log.debug('creating group level: %s group_name: %s',
+                      lvl, group_name)
             group = RepoGroup(group_name, parent)
             group.group_description = desc
             group.user = owner
@@ -495,7 +495,7 @@ def repo2db_mapper(initial_repo_list, re
         db_repo = repo_model.get_by_repo_name(unicode_name)
         # found repo that is on filesystem not in Kallithea database
         if not db_repo:
-            log.info('repository %s not found, creating now' % name)
+            log.info('repository %s not found, creating now', name)
             added.append(name)
             desc = (repo.description
                     if repo.description != 'unknown'
@@ -532,7 +532,7 @@ def repo2db_mapper(initial_repo_list, re
     for repo in sa.query(Repository).all():
         if repo.repo_name not in initial_repo_list.keys():
             if remove_obsolete:
-                log.debug("Removing non-existing repository found in db `%s`" %
+                log.debug("Removing non-existing repository found in db `%s`",
                           repo.repo_name)
                 try:
                     RepoModel(sa).delete(repo, forks='detach', fs_remove=False)
@@ -581,7 +581,7 @@ def load_rcextensions(root_path):
     if os.path.isfile(path):
         rcext = create_module('rc', path)
         EXT = kallithea.EXTENSIONS = rcext
-        log.debug('Found rcextensions now loading %s...' % rcext)
+        log.debug('Found rcextensions now loading %s...', rcext)
 
         # Additional mappings that are not present in the pygments lexers
         conf.LANGUAGES_EXTENSIONS_MAP.update(getattr(EXT, 'EXTRA_MAPPINGS', {}))
@@ -657,11 +657,11 @@ def create_test_env(repos_test_path, con
 
     # PART ONE create db
     dbconf = config['sqlalchemy.db1.url']
-    log.debug('making test db %s' % dbconf)
+    log.debug('making test db %s', dbconf)
 
     # create test dir if it doesn't exist
     if not os.path.isdir(repos_test_path):
-        log.debug('Creating testdir %s' % repos_test_path)
+        log.debug('Creating testdir %s', repos_test_path)
         os.makedirs(repos_test_path)
 
     dbmanage = DbManage(log_sql=True, dbconf=dbconf, root=config['here'],
@@ -682,11 +682,11 @@ def create_test_env(repos_test_path, con
 
     #clean index and data
     if idx_path and os.path.exists(idx_path):
-        log.debug('remove %s' % idx_path)
+        log.debug('remove %s', idx_path)
         shutil.rmtree(idx_path)
 
     if data_path and os.path.exists(data_path):
-        log.debug('remove %s' % data_path)
+        log.debug('remove %s', data_path)
         shutil.rmtree(data_path)
 
     #CREATE DEFAULT TEST REPOS
@@ -810,10 +810,10 @@ def check_git_version():
 
     req_ver = StrictVersion('1.7.4')
 
-    log.debug('Git executable: "%s" version %s detected: %s'
-              % (settings.GIT_EXECUTABLE_PATH, ver, stdout))
+    log.debug('Git executable: "%s" version %s detected: %s',
+              settings.GIT_EXECUTABLE_PATH, ver, stdout)
     if stderr:
-        log.warning('Error detecting git version: %r' % stderr)
+        log.warning('Error detecting git version: %r', stderr)
     elif ver < req_ver:
         log.warning('Kallithea detected git version %s, which is too old '
                     'for the system to function properly. '
diff --git a/kallithea/model/__init__.py b/kallithea/model/__init__.py
--- a/kallithea/model/__init__.py
+++ b/kallithea/model/__init__.py
@@ -60,7 +60,7 @@ def init_model(engine):
     :param engine: engine to bind to
     """
     engine_str = obfuscate_url_pw(str(engine.url))
-    log.info("initializing db for %s" % engine_str)
+    log.info("initializing db for %s", engine_str)
     meta.Base.metadata.bind = engine
 
 
diff --git a/kallithea/model/db.py b/kallithea/model/db.py
--- a/kallithea/model/db.py
+++ b/kallithea/model/db.py
@@ -635,7 +635,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session().add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def get_first_admin(cls):
@@ -1352,15 +1352,15 @@ class Repository(Base, BaseModel):
         if (not self.changeset_cache or cs_cache['raw_id'] != self.changeset_cache['raw_id']):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s',
+                      self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('changeset_cache for %s already up to date with %s'
-                      % (self.repo_name, cs_cache['raw_id']))
+            log.debug('changeset_cache for %s already up to date with %s',
+                      self.repo_name, cs_cache['raw_id'])
 
     @property
     def tip(self):
@@ -1451,18 +1451,18 @@ class Repository(Base, BaseModel):
 
         valid = CacheInvalidation.test_and_set_valid(rn, None, valid_cache_keys=valid_cache_keys)
         if not valid:
-            log.debug('Cache for %s invalidated, getting new object' % (rn))
+            log.debug('Cache for %s invalidated, getting new object', rn)
             region_invalidate(_c, None, rn)
         else:
-            log.debug('Getting scm_instance of %s from cache' % (rn))
+            log.debug('Getting scm_instance of %s from cache', rn)
         return _c(rn)
 
     def __get_instance(self):
         repo_full_path = self.repo_full_path
 
         alias = get_scm(repo_full_path)[0]
-        log.debug('Creating instance of %s repository from %s'
-                  % (alias, repo_full_path))
+        log.debug('Creating instance of %s repository from %s',
+                  alias, repo_full_path)
         backend = get_backend(alias)
 
         if alias == 'hg':
@@ -2111,12 +2111,12 @@ class CacheInvalidation(Base, BaseModel)
         Mark all caches of a repo as invalid in the database.
         """
         inv_objs = Session().query(cls).filter(cls.cache_args == repo_name).all()
-        log.debug('for repo %s got %s invalidation objects'
-                  % (safe_str(repo_name), inv_objs))
+        log.debug('for repo %s got %s invalidation objects',
+                  safe_str(repo_name), inv_objs)
 
         for inv_obj in inv_objs:
-            log.debug('marking %s key for invalidation based on repo_name=%s'
-                      % (inv_obj, safe_str(repo_name)))
+            log.debug('marking %s key for invalidation based on repo_name=%s',
+                      inv_obj, safe_str(repo_name))
             if delete:
                 Session().delete(inv_obj)
             else:
diff --git a/kallithea/model/gist.py b/kallithea/model/gist.py
--- a/kallithea/model/gist.py
+++ b/kallithea/model/gist.py
@@ -65,7 +65,7 @@ class GistModel(BaseModel):
         """
         root_path = RepoModel().repos_path
         rm_path = os.path.join(root_path, GIST_STORE_LOC, gist.gist_access_id)
-        log.info("Removing %s" % (rm_path,))
+        log.info("Removing %s", rm_path)
         shutil.rmtree(rm_path)
 
     def _store_metadata(self, repo, gist_id, gist_access_id, user_id, gist_type,
@@ -113,9 +113,9 @@ class GistModel(BaseModel):
         gist_id = safe_unicode(unique_id(20))
         lifetime = safe_int(lifetime, -1)
         gist_expires = time.time() + (lifetime * 60) if lifetime != -1 else -1
-        log.debug('set GIST expiration date to: %s'
-                  % (time_to_datetime(gist_expires)
-                   if gist_expires != -1 else 'forever'))
+        log.debug('set GIST expiration date to: %s',
+                  time_to_datetime(gist_expires)
+                   if gist_expires != -1 else 'forever')
         #create the Database version
         gist = Gist()
         gist.gist_description = description
@@ -132,7 +132,7 @@ class GistModel(BaseModel):
             self.sa.add(gist)
 
         gist_repo_path = os.path.join(GIST_STORE_LOC, gist_id)
-        log.debug('Creating new %s GIST repo in %s' % (gist_type, gist_repo_path))
+        log.debug('Creating new %s GIST repo in %s', gist_type, gist_repo_path)
         repo = RepoModel()._create_filesystem_repo(
             repo_name=gist_id, repo_type='hg', repo_group=GIST_STORE_LOC)
 
diff --git a/kallithea/model/notification.py b/kallithea/model/notification.py
--- a/kallithea/model/notification.py
+++ b/kallithea/model/notification.py
@@ -91,14 +91,14 @@ class NotificationModel(BaseModel):
                     # TODO: inform user that requested operation couldn't be completed
                     log.error('cannot email unknown user %r', u)
             recipients_objs = set(recipients_objs)
-            log.debug('sending notifications %s to %s' % (
-                type_, recipients_objs)
+            log.debug('sending notifications %s to %s',
+                type_, recipients_objs
             )
         elif recipients is None:
             # empty recipients means to all admins
             recipients_objs = User.query().filter(User.admin == True).all()
-            log.debug('sending notifications %s to admins: %s' % (
-                type_, recipients_objs)
+            log.debug('sending notifications %s to admins: %s',
+                type_, recipients_objs
             )
         #else: silently skip notification mails?
 
@@ -338,5 +338,5 @@ class EmailNotificationModel(BaseModel):
                    'h': h,
                    'c': c}
         _kwargs.update(kwargs)
-        log.debug('rendering tmpl %s with kwargs %s' % (base, _kwargs))
+        log.debug('rendering tmpl %s with kwargs %s', base, _kwargs)
         return email_template.render(**_kwargs)
diff --git a/kallithea/model/permission.py b/kallithea/model/permission.py
--- a/kallithea/model/permission.py
+++ b/kallithea/model/permission.py
@@ -79,7 +79,7 @@ class PermissionModel(BaseModel):
         perms = UserToPerm.query().filter(UserToPerm.user == user).all()
         defined_perms_groups = map(_get_group,
                                 (x.permission.permission_name for x in perms))
-        log.debug('GOT ALREADY DEFINED:%s' % perms)
+        log.debug('GOT ALREADY DEFINED:%s', perms)
         DEFAULT_PERMS = Permission.DEFAULT_USER_PERMISSIONS
 
         if force:
@@ -92,8 +92,8 @@ class PermissionModel(BaseModel):
         for perm_name in DEFAULT_PERMS:
             gr = _get_group(perm_name)
             if gr not in defined_perms_groups:
-                log.debug('GR:%s not found, creating permission %s'
-                          % (gr, perm_name))
+                log.debug('GR:%s not found, creating permission %s',
+                          gr, perm_name)
                 new_perm = _make_perm(perm_name)
                 self.sa.add(new_perm)
 
@@ -108,7 +108,7 @@ class PermissionModel(BaseModel):
 
             # stage 2 reset defaults and set them from form data
             def _make_new(usr, perm_name):
-                log.debug('Creating new permission:%s' % (perm_name))
+                log.debug('Creating new permission:%s', perm_name)
                 new = UserToPerm()
                 new.user = usr
                 new.permission = Permission.get_by_key(perm_name)
diff --git a/kallithea/model/pull_request.py b/kallithea/model/pull_request.py
--- a/kallithea/model/pull_request.py
+++ b/kallithea/model/pull_request.py
@@ -179,7 +179,7 @@ class PullRequestModel(BaseModel):
         mention_recipients.difference_update(User.get_by_username(username, case_insensitive=True)
                                              for username in extract_mentioned_users(old_description))
 
-        log.debug("Mentioning %s" % mention_recipients)
+        log.debug("Mentioning %s", mention_recipients)
         self.__add_reviewers(pr, [], mention_recipients)
 
     def update_reviewers(self, pull_request, reviewers_ids):
@@ -194,10 +194,10 @@ class PullRequestModel(BaseModel):
         to_add = reviewers_ids.difference(current_reviewers_ids)
         to_remove = current_reviewers_ids.difference(reviewers_ids)
 
-        log.debug("Adding %s reviewers" % to_add)
+        log.debug("Adding %s reviewers", to_add)
         self.__add_reviewers(pull_request, to_add)
 
-        log.debug("Removing %s reviewers" % to_remove)
+        log.debug("Removing %s reviewers", to_remove)
         for uid in to_remove:
             reviewer = PullRequestReviewers.query()\
                     .filter(PullRequestReviewers.user_id==uid,
diff --git a/kallithea/model/repo.py b/kallithea/model/repo.py
--- a/kallithea/model/repo.py
+++ b/kallithea/model/repo.py
@@ -324,7 +324,7 @@ class RepoModel(BaseModel):
 
             if 'repo_group' in kwargs:
                 cur_repo.group = RepoGroup.get(kwargs['repo_group'])
-            log.debug('Updating repo %s with params:%s' % (cur_repo, kwargs))
+            log.debug('Updating repo %s with params:%s', cur_repo, kwargs)
             for k in ['repo_enable_downloads',
                       'repo_description',
                       'repo_enable_locking',
@@ -584,7 +584,7 @@ class RepoModel(BaseModel):
         obj.user = user
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, user, repo))
+        log.debug('Granted perm %s to %s on %s', perm, user, repo)
         return obj
 
     def revoke_user_permission(self, repo, user):
@@ -604,7 +604,7 @@ class RepoModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm on %s on %s' % (repo, user))
+            log.debug('Revoked perm on %s on %s', repo, user)
 
     def grant_user_group_permission(self, repo, group_name, perm):
         """
@@ -634,7 +634,7 @@ class RepoModel(BaseModel):
         obj.users_group = group_name
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, group_name, repo))
+        log.debug('Granted perm %s to %s on %s', perm, group_name, repo)
         return obj
 
     def revoke_user_group_permission(self, repo, group_name):
@@ -654,7 +654,7 @@ class RepoModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm to %s on %s' % (repo, group_name))
+            log.debug('Revoked perm to %s on %s', repo, group_name)
 
     def delete_stats(self, repo_name):
         """
@@ -710,9 +710,9 @@ class RepoModel(BaseModel):
         if is_valid_repo_group(repo_path, self.repos_path):
             raise Exception('This path %s is a valid group' % repo_path)
 
-        log.info('creating repo %s in %s from url: `%s`' % (
+        log.info('creating repo %s in %s from url: `%s`',
             repo_name, safe_unicode(repo_path),
-            obfuscate_url_pw(clone_uri)))
+            obfuscate_url_pw(clone_uri))
 
         backend = get_backend(repo_type)
 
@@ -731,8 +731,8 @@ class RepoModel(BaseModel):
         else:
             raise Exception('Not supported repo_type %s expected hg/git' % repo_type)
 
-        log.debug('Created repo %s with %s backend'
-                  % (safe_unicode(repo_name), safe_unicode(repo_type)))
+        log.debug('Created repo %s with %s backend',
+                  safe_unicode(repo_name), safe_unicode(repo_type))
         return repo
 
     def _rename_filesystem_repo(self, old, new):
@@ -742,7 +742,7 @@ class RepoModel(BaseModel):
         :param old: old name
         :param new: new name
         """
-        log.info('renaming repo from %s to %s' % (old, new))
+        log.info('renaming repo from %s to %s', old, new)
 
         old_path = os.path.join(self.repos_path, old)
         new_path = os.path.join(self.repos_path, new)
@@ -761,7 +761,7 @@ class RepoModel(BaseModel):
         :param repo: repo object
         """
         rm_path = os.path.join(self.repos_path, repo.repo_name)
-        log.info("Removing %s" % (rm_path))
+        log.info("Removing %s", rm_path)
 
         _now = datetime.now()
         _ms = str(_now.microsecond).rjust(6, '0')
diff --git a/kallithea/model/repo_group.py b/kallithea/model/repo_group.py
--- a/kallithea/model/repo_group.py
+++ b/kallithea/model/repo_group.py
@@ -87,13 +87,13 @@ class RepoGroupModel(BaseModel):
         """
 
         create_path = os.path.join(self.repos_path, group_name)
-        log.debug('creating new group in %s' % create_path)
+        log.debug('creating new group in %s', create_path)
 
         if os.path.isdir(create_path):
             raise Exception('That directory already exists !')
 
         os.makedirs(create_path)
-        log.debug('Created group in %s' % create_path)
+        log.debug('Created group in %s', create_path)
 
     def _rename_group(self, old, new):
         """
@@ -106,12 +106,12 @@ class RepoGroupModel(BaseModel):
             log.debug('skipping group rename')
             return
 
-        log.debug('renaming repository group from %s to %s' % (old, new))
+        log.debug('renaming repository group from %s to %s', old, new)
 
         old_path = os.path.join(self.repos_path, old)
         new_path = os.path.join(self.repos_path, new)
 
-        log.debug('renaming repos paths from %s to %s' % (old_path, new_path))
+        log.debug('renaming repos paths from %s to %s', old_path, new_path)
 
         if os.path.isdir(new_path):
             raise Exception('Was trying to rename to already '
@@ -129,7 +129,7 @@ class RepoGroupModel(BaseModel):
         paths = os.sep.join(paths)
 
         rm_path = os.path.join(self.repos_path, paths)
-        log.info("Removing group %s" % (rm_path))
+        log.info("Removing group %s", rm_path)
         # delete only if that path really exists
         if os.path.isdir(rm_path):
             if force_delete:
@@ -235,8 +235,8 @@ class RepoGroupModel(BaseModel):
 
         # start updates
         updates = []
-        log.debug('Now updating permissions for %s in recursive mode:%s'
-                  % (repo_group, recursive))
+        log.debug('Now updating permissions for %s in recursive mode:%s',
+                  repo_group, recursive)
 
         for obj in repo_group.recursive_groups_and_repos():
             # iterated obj is an instance of a repos group or repository in
@@ -336,7 +336,7 @@ class RepoGroupModel(BaseModel):
             self.sa.delete(repo_group)
             self._delete_group(repo_group, force_delete)
         except Exception:
-            log.error('Error removing repo_group %s' % repo_group)
+            log.error('Error removing repo_group %s', repo_group)
             raise
 
     def add_permission(self, repo_group, obj, obj_type, perm, recursive):
@@ -466,7 +466,7 @@ class RepoGroupModel(BaseModel):
         obj.user = user
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, user, repo_group))
+        log.debug('Granted perm %s to %s on %s', perm, user, repo_group)
         return obj
 
     def revoke_user_permission(self, repo_group, user):
@@ -487,7 +487,7 @@ class RepoGroupModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm on %s on %s' % (repo_group, user))
+            log.debug('Revoked perm on %s on %s', repo_group, user)
 
     def grant_user_group_permission(self, repo_group, group_name, perm):
         """
@@ -518,7 +518,7 @@ class RepoGroupModel(BaseModel):
         obj.users_group = group_name
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, group_name, repo_group))
+        log.debug('Granted perm %s to %s on %s', perm, group_name, repo_group)
         return obj
 
     def revoke_user_group_permission(self, repo_group, group_name):
@@ -539,4 +539,4 @@ class RepoGroupModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm to %s on %s' % (repo_group, group_name))
+            log.debug('Revoked perm to %s on %s', repo_group, group_name)
diff --git a/kallithea/model/scm.py b/kallithea/model/scm.py
--- a/kallithea/model/scm.py
+++ b/kallithea/model/scm.py
@@ -272,7 +272,7 @@ class ScmModel(BaseModel):
         if repos_path is None:
             repos_path = self.repos_path
 
-        log.info('scanning for repositories in %s' % repos_path)
+        log.info('scanning for repositories in %s', repos_path)
 
         baseui = make_ui('db')
         repos = {}
@@ -297,7 +297,7 @@ class ScmModel(BaseModel):
                         repos[name] = klass(path[1])
             except OSError:
                 continue
-        log.debug('found %s paths with repositories' % (len(repos)))
+        log.debug('found %s paths with repositories', len(repos))
         return repos
 
     def get_repos(self, all_repos=None, sort_key=None, simple=False):
@@ -854,7 +854,7 @@ class ScmModel(BaseModel):
         for h_type, tmpl in [('pre', tmpl_pre), ('post', tmpl_post)]:
             _hook_file = jn(loc, '%s-receive' % h_type)
             has_hook = False
-            log.debug('Installing git hook in repo %s' % repo)
+            log.debug('Installing git hook in repo %s', repo)
             if os.path.exists(_hook_file):
                 # let's take a look at this hook, maybe it's kallithea ?
                 log.debug('hook exists, checking if it is from kallithea')
@@ -865,7 +865,7 @@ class ScmModel(BaseModel):
                     if matches:
                         try:
                             ver = matches.groups()[0]
-                            log.debug('got %s it is kallithea' % (ver))
+                            log.debug('got %s it is kallithea', ver)
                             has_hook = True
                         except Exception:
                             log.error(traceback.format_exc())
@@ -874,14 +874,14 @@ class ScmModel(BaseModel):
                 has_hook = True
 
             if has_hook or force_create:
-                log.debug('writing %s hook file !' % (h_type,))
+                log.debug('writing %s hook file !', h_type)
                 try:
                     with open(_hook_file, 'wb') as f:
                         tmpl = tmpl.replace('_TMPL_', kallithea.__version__)
                         f.write(tmpl)
                     os.chmod(_hook_file, 0755)
                 except IOError as e:
-                    log.error('error writing %s: %s' % (_hook_file, e))
+                    log.error('error writing %s: %s', _hook_file, e)
             else:
                 log.debug('skipping writing hook file')
 
diff --git a/kallithea/model/user.py b/kallithea/model/user.py
--- a/kallithea/model/user.py
+++ b/kallithea/model/user.py
@@ -125,14 +125,14 @@ class UserModel(BaseModel):
         # raises UserCreationError if it's not allowed
         check_allowed_create_user(user_data, cur_user)
 
-        log.debug('Checking for %s account in Kallithea database' % username)
+        log.debug('Checking for %s account in Kallithea database', username)
         user = User.get_by_username(username, case_insensitive=True)
         if user is None:
-            log.debug('creating new user %s' % username)
+            log.debug('creating new user %s', username)
             new_user = User()
             edit = False
         else:
-            log.debug('updating user %s' % username)
+            log.debug('updating user %s', username)
             new_user = user
             edit = True
 
@@ -156,7 +156,7 @@ class UserModel(BaseModel):
                 not check_password(password, new_user.password)
             if not edit or password_change:
                 reason = 'new password' if edit else 'new user'
-                log.debug('Updating password reason=>%s' % (reason,))
+                log.debug('Updating password reason=>%s', reason)
                 new_user.password = get_crypt_password(password) \
                     if password else None
 
@@ -279,7 +279,7 @@ class UserModel(BaseModel):
         user_email = data['email']
         user = User.get_by_email(user_email)
         if user is not None:
-            log.debug('password reset user found %s' % user)
+            log.debug('password reset user found %s', user)
             link = h.canonical_url('reset_password_confirmation',
                                    key=user.api_key)
             reg_type = EmailNotificationModel.TYPE_PASSWORD_RESET
@@ -294,9 +294,9 @@ class UserModel(BaseModel):
             log.debug('sending email')
             run_task(tasks.send_email, [user_email],
                      _("Password reset link"), body, html_body)
-            log.info('send new password mail to %s' % user_email)
+            log.info('send new password mail to %s', user_email)
         else:
-            log.debug("password reset email %s not found" % user_email)
+            log.debug("password reset email %s not found", user_email)
 
         return True
 
@@ -311,14 +311,14 @@ class UserModel(BaseModel):
             user.password = auth.get_crypt_password(new_passwd)
             Session().add(user)
             Session().commit()
-            log.info('change password for %s' % user_email)
+            log.info('change password for %s', user_email)
         if new_passwd is None:
             raise Exception('unable to generate new password')
 
         run_task(tasks.send_email, [user_email],
                  _('Your new password'),
                  _('Your new Kallithea password:%s') % (new_passwd,))
-        log.info('send new password mail to %s' % user_email)
+        log.info('send new password mail to %s', user_email)
 
         return True
 
diff --git a/kallithea/model/user_group.py b/kallithea/model/user_group.py
--- a/kallithea/model/user_group.py
+++ b/kallithea/model/user_group.py
@@ -283,7 +283,7 @@ class UserGroupModel(BaseModel):
         obj.user = user
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, user, user_group))
+        log.debug('Granted perm %s to %s on %s', perm, user, user_group)
         return obj
 
     def revoke_user_permission(self, user_group, user):
@@ -304,7 +304,7 @@ class UserGroupModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm on %s on %s' % (user_group, user))
+            log.debug('Revoked perm on %s on %s', user_group, user)
 
     def grant_user_group_permission(self, target_user_group, user_group, perm):
         """
@@ -334,7 +334,7 @@ class UserGroupModel(BaseModel):
         obj.target_user_group = target_user_group
         obj.permission = permission
         self.sa.add(obj)
-        log.debug('Granted perm %s to %s on %s' % (perm, target_user_group, user_group))
+        log.debug('Granted perm %s to %s on %s', perm, target_user_group, user_group)
         return obj
 
     def revoke_user_group_permission(self, target_user_group, user_group):
@@ -353,11 +353,11 @@ class UserGroupModel(BaseModel):
             .scalar()
         if obj is not None:
             self.sa.delete(obj)
-            log.debug('Revoked perm on %s on %s' % (target_user_group, user_group))
+            log.debug('Revoked perm on %s on %s', target_user_group, user_group)
 
     def enforce_groups(self, user, groups, extern_type=None):
         user = self._get_user(user)
-        log.debug('Enforcing groups %s on user %s' % (user, groups))
+        log.debug('Enforcing groups %s on user %s', user, groups)
         current_groups = user.group_member
         # find the external created groups
         externals = [x.users_group for x in current_groups
@@ -367,7 +367,7 @@ class UserGroupModel(BaseModel):
         # externals that are not in groups
         for gr in externals:
             if gr.users_group_name not in groups:
-                log.debug('Removing user %s from user group %s' % (user, gr))
+                log.debug('Removing user %s from user group %s', user, gr)
                 self.remove_user_from_group(gr, user)
 
         # now we calculate in which groups user should be == groups params
@@ -383,7 +383,7 @@ class UserGroupModel(BaseModel):
             # we can only add users to special groups created via plugins
             managed = 'extern_type' in existing_group.group_data
             if managed:
-                log.debug('Adding user %s to user group %s' % (user, gr))
+                log.debug('Adding user %s to user group %s', user, gr)
                 UserGroupModel().add_user_to_group(existing_group, user)
             else:
                 log.debug('Skipping addition to group %s since it is '
diff --git a/kallithea/model/validators.py b/kallithea/model/validators.py
--- a/kallithea/model/validators.py
+++ b/kallithea/model/validators.py
@@ -312,13 +312,13 @@ def ValidAuth():
             if auth_modules.authenticate(username, password) is None:
                 user = User.get_by_username(username)
                 if user and not user.active:
-                    log.warning('user %s is disabled' % username)
+                    log.warning('user %s is disabled', username)
                     msg = M(self, 'invalid_auth', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(username=' ', password=msg)
                     )
                 else:
-                    log.warning('user %s failed to authenticate' % username)
+                    log.warning('user %s failed to authenticate', username)
                     msg = M(self, 'invalid_auth', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(username=' ', password=msg)
diff --git a/kallithea/tests/scripts/manual_test_concurrency.py b/kallithea/tests/scripts/manual_test_concurrency.py
--- a/kallithea/tests/scripts/manual_test_concurrency.py
+++ b/kallithea/tests/scripts/manual_test_concurrency.py
@@ -72,7 +72,7 @@ class Command(object):
         """
 
         command = cmd + ' ' + ' '.join(args)
-        log.debug('Executing %s' % command)
+        log.debug('Executing %s', command)
         if DEBUG:
             print command
         p = Popen(command, shell=True, stdout=PIPE, stderr=PIPE, cwd=self.cwd)