Fix for bug #4155. Fix, data change only for admin.

rhodecode/model/repo.py

@@ -1,1073 +1,1073 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2010-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 """
 Repository model for rhodecode
 """
 
 import logging
 import os
 import re
 import shutil
 import time
 import traceback
 from datetime import datetime, timedelta
 
 from sqlalchemy.sql import func
 from sqlalchemy.sql.expression import true, or_
 from zope.cachedescriptors.property import Lazy as LazyProperty
 
 from rhodecode import events
 from rhodecode.lib import helpers as h
 from rhodecode.lib.auth import HasUserGroupPermissionAny
 from rhodecode.lib.caching_query import FromCache
 from rhodecode.lib.exceptions import AttachedForksError
 from rhodecode.lib.hooks_base import log_delete_repository
 from rhodecode.lib.markup_renderer import MarkupRenderer
 from rhodecode.lib.utils import make_db_config
 from rhodecode.lib.utils2 import (
     safe_str, safe_unicode, remove_prefix, obfuscate_url_pw,
     get_current_rhodecode_user, safe_int, datetime_to_time, action_logger_generic)
 from rhodecode.lib.vcs.backends import get_backend
 from rhodecode.lib.vcs.exceptions import NodeDoesNotExistError
 from rhodecode.model import BaseModel
 from rhodecode.model.db import (
     Repository, UserRepoToPerm, UserGroupRepoToPerm, UserRepoGroupToPerm,
     UserGroupRepoGroupToPerm, User, Permission, Statistics, UserGroup,
     RepoGroup, RepositoryField)
 from rhodecode.model.scm import UserGroupList
 from rhodecode.model.settings import VcsSettingsModel
 
 
 log = logging.getLogger(__name__)
 
 
 class RepoModel(BaseModel):
 
     cls = Repository
 
     def _get_user_group(self, users_group):
         return self._get_instance(UserGroup, users_group,
                                   callback=UserGroup.get_by_group_name)
 
     def _get_repo_group(self, repo_group):
         return self._get_instance(RepoGroup, repo_group,
                                   callback=RepoGroup.get_by_group_name)
 
     def _create_default_perms(self, repository, private):
         # create default permission
         default = 'repository.read'
         def_user = User.get_default_user()
         for p in def_user.user_perms:
             if p.permission.permission_name.startswith('repository.'):
                 default = p.permission.permission_name
                 break
 
         default_perm = 'repository.none' if private else default
 
         repo_to_perm = UserRepoToPerm()
         repo_to_perm.permission = Permission.get_by_key(default_perm)
 
         repo_to_perm.repository = repository
         repo_to_perm.user_id = def_user.user_id
 
         return repo_to_perm
 
     @LazyProperty
     def repos_path(self):
         """
         Gets the repositories root path from database
         """
         settings_model = VcsSettingsModel(sa=self.sa)
         return settings_model.get_repos_location()
 
     def get(self, repo_id, cache=False):
         repo = self.sa.query(Repository) \
             .filter(Repository.repo_id == repo_id)
 
         if cache:
             repo = repo.options(FromCache("sql_cache_short",
                                           "get_repo_%s" % repo_id))
         return repo.scalar()
 
     def get_repo(self, repository):
         return self._get_repo(repository)
 
     def get_by_repo_name(self, repo_name, cache=False):
         repo = self.sa.query(Repository) \
             .filter(Repository.repo_name == repo_name)
 
         if cache:
             repo = repo.options(FromCache("sql_cache_short",
                                           "get_repo_%s" % repo_name))
         return repo.scalar()
 
     def _extract_id_from_repo_name(self, repo_name):
         if repo_name.startswith('/'):
             repo_name = repo_name.lstrip('/')
         by_id_match = re.match(r'^_(\d{1,})', repo_name)
         if by_id_match:
             return by_id_match.groups()[0]
 
     def get_repo_by_id(self, repo_name):
         """
         Extracts repo_name by id from special urls.
         Example url is _11/repo_name
 
         :param repo_name:
         :return: repo object if matched else None
         """
         try:
             _repo_id = self._extract_id_from_repo_name(repo_name)
             if _repo_id:
                 return self.get(_repo_id)
         except Exception:
             log.exception('Failed to extract repo_name from URL')
 
         return None
 
     def get_repos_for_root(self, root, traverse=False):
         if traverse:
             like_expression = u'{}%'.format(safe_unicode(root))
             repos = Repository.query().filter(
                 Repository.repo_name.like(like_expression)).all()
         else:
             if root and not isinstance(root, RepoGroup):
                 raise ValueError(
                     'Root must be an instance '
                     'of RepoGroup, got:{} instead'.format(type(root)))
             repos = Repository.query().filter(Repository.group == root).all()
         return repos
 
     def get_url(self, repo):
         return h.url('summary_home', repo_name=safe_str(repo.repo_name),
             qualified=True)
 
     def get_users(self, name_contains=None, limit=20, only_active=True):
 
         # TODO: mikhail: move this method to the UserModel.
         query = self.sa.query(User)
         if only_active:
             query = query.filter(User.active == true())
 
         if name_contains:
             ilike_expression = u'%{}%'.format(safe_unicode(name_contains))
             query = query.filter(
                 or_(
                     User.name.ilike(ilike_expression),
                     User.lastname.ilike(ilike_expression),
                     User.username.ilike(ilike_expression)
                 )
             )
             query = query.limit(limit)
         users = query.all()
 
         _users = [
             {
                 'id': user.user_id,
                 'first_name': user.name,
                 'last_name': user.lastname,
                 'username': user.username,
                 'email': user.email,
                 'icon_link': h.gravatar_url(user.email, 30),
                 'value_display': h.person(user),
                 'value': user.username,
                 'value_type': 'user',
                 'active': user.active,
             }
             for user in users
         ]
         return _users
 
     def get_user_groups(self, name_contains=None, limit=20, only_active=True):
         # TODO: mikhail: move this method to the UserGroupModel.
         query = self.sa.query(UserGroup)
         if only_active:
             query = query.filter(UserGroup.users_group_active == true())
 
         if name_contains:
             ilike_expression = u'%{}%'.format(safe_unicode(name_contains))
             query = query.filter(
                 UserGroup.users_group_name.ilike(ilike_expression))\
                 .order_by(func.length(UserGroup.users_group_name))\
                 .order_by(UserGroup.users_group_name)
 
             query = query.limit(limit)
         user_groups = query.all()
         perm_set = ['usergroup.read', 'usergroup.write', 'usergroup.admin']
         user_groups = UserGroupList(user_groups, perm_set=perm_set)
 
         _groups = [
             {
                 'id': group.users_group_id,
                 # TODO: marcink figure out a way to generate the url for the
                 # icon
                 'icon_link': '',
                 'value_display': 'Group: %s (%d members)' % (
                     group.users_group_name, len(group.members),),
                 'value': group.users_group_name,
                 'value_type': 'user_group',
                 'active': group.users_group_active,
             }
             for group in user_groups
         ]
         return _groups
 
     @classmethod
     def update_repoinfo(cls, repositories=None):
         if not repositories:
             repositories = Repository.getAll()
         for repo in repositories:
             repo.update_commit_cache()
 
     def get_repos_as_dict(self, repo_list=None, admin=False,
                           super_user_actions=False):
 
         from rhodecode.lib.utils import PartialRenderer
         _render = PartialRenderer('data_table/_dt_elements.mako')
         c = _render.c
 
         def quick_menu(repo_name):
             return _render('quick_menu', repo_name)
 
         def repo_lnk(name, rtype, rstate, private, fork_of):
             return _render('repo_name', name, rtype, rstate, private, fork_of,
                            short_name=not admin, admin=False)
 
         def last_change(last_change):
-            if isinstance(last_change, datetime) and not last_change.tzinfo:
+            if admin and isinstance(last_change, datetime) and not last_change.tzinfo:
                 last_change = last_change + timedelta(seconds=
                     (datetime.now() - datetime.utcnow()).seconds)
             return _render("last_change", last_change)
 
         def rss_lnk(repo_name):
             return _render("rss", repo_name)
 
         def atom_lnk(repo_name):
             return _render("atom", repo_name)
 
         def last_rev(repo_name, cs_cache):
             return _render('revision', repo_name, cs_cache.get('revision'),
                            cs_cache.get('raw_id'), cs_cache.get('author'),
                            cs_cache.get('message'))
 
         def desc(desc):
             if c.visual.stylify_metatags:
                 desc = h.urlify_text(h.escaped_stylize(desc))
             else:
                 desc = h.urlify_text(h.html_escape(desc))
 
             return _render('repo_desc', desc)
 
         def state(repo_state):
             return _render("repo_state", repo_state)
 
         def repo_actions(repo_name):
             return _render('repo_actions', repo_name, super_user_actions)
 
         def user_profile(username):
             return _render('user_profile', username)
 
         repos_data = []
         for repo in repo_list:
             cs_cache = repo.changeset_cache
             row = {
                 "menu": quick_menu(repo.repo_name),
 
                 "name": repo_lnk(repo.repo_name, repo.repo_type,
                                  repo.repo_state, repo.private, repo.fork),
                 "name_raw": repo.repo_name.lower(),
 
                 "last_change": last_change(repo.last_db_change),
                 "last_change_raw": datetime_to_time(repo.last_db_change),
 
                 "last_changeset": last_rev(repo.repo_name, cs_cache),
                 "last_changeset_raw": cs_cache.get('revision'),
 
                 "desc": desc(repo.description),
                 "owner": user_profile(repo.user.username),
 
                 "state": state(repo.repo_state),
                 "rss": rss_lnk(repo.repo_name),
 
                 "atom": atom_lnk(repo.repo_name),
             }
             if admin:
                 row.update({
                     "action": repo_actions(repo.repo_name),
                 })
             repos_data.append(row)
 
         return repos_data
 
     def _get_defaults(self, repo_name):
         """
         Gets information about repository, and returns a dict for
         usage in forms
 
         :param repo_name:
         """
 
         repo_info = Repository.get_by_repo_name(repo_name)
 
         if repo_info is None:
             return None
 
         defaults = repo_info.get_dict()
         defaults['repo_name'] = repo_info.just_name
 
         groups  = repo_info.groups_with_parents
         parent_group = groups[-1] if groups else None
 
         # we use -1 as this is how in HTML, we mark an empty group
         defaults['repo_group'] = getattr(parent_group, 'group_id', -1)
 
         keys_to_process = (
             {'k': 'repo_type', 'strip': False},
             {'k': 'repo_enable_downloads', 'strip': True},
             {'k': 'repo_description', 'strip': True},
             {'k': 'repo_enable_locking', 'strip': True},
             {'k': 'repo_landing_rev', 'strip': True},
             {'k': 'clone_uri', 'strip': False},
             {'k': 'repo_private', 'strip': True},
             {'k': 'repo_enable_statistics', 'strip': True}
         )
 
         for item in keys_to_process:
             attr = item['k']
             if item['strip']:
                 attr = remove_prefix(item['k'], 'repo_')
 
             val = defaults[attr]
             if item['k'] == 'repo_landing_rev':
                 val = ':'.join(defaults[attr])
             defaults[item['k']] = val
             if item['k'] == 'clone_uri':
                 defaults['clone_uri_hidden'] = repo_info.clone_uri_hidden
 
         # fill owner
         if repo_info.user:
             defaults.update({'user': repo_info.user.username})
         else:
             replacement_user = User.get_first_super_admin().username
             defaults.update({'user': replacement_user})
 
         # fill repository users
         for p in repo_info.repo_to_perm:
             defaults.update({'u_perm_%s' % p.user.user_id:
                             p.permission.permission_name})
 
         # fill repository groups
         for p in repo_info.users_group_to_perm:
             defaults.update({'g_perm_%s' % p.users_group.users_group_id:
                             p.permission.permission_name})
 
         return defaults
 
     def update(self, repo, **kwargs):
         try:
             cur_repo = self._get_repo(repo)
             source_repo_name = cur_repo.repo_name
             if 'user' in kwargs:
                 cur_repo.user = User.get_by_username(kwargs['user'])
 
             if 'repo_group' in kwargs:
                 cur_repo.group = RepoGroup.get(kwargs['repo_group'])
             log.debug('Updating repo %s with params:%s', cur_repo, kwargs)
 
             update_keys = [
                 (1, 'repo_description'),
                 (1, 'repo_landing_rev'),
                 (1, 'repo_private'),
                 (1, 'repo_enable_downloads'),
                 (1, 'repo_enable_locking'),
                 (1, 'repo_enable_statistics'),
                 (0, 'clone_uri'),
                 (0, 'fork_id')
             ]
             for strip, k in update_keys:
                 if k in kwargs:
                     val = kwargs[k]
                     if strip:
                         k = remove_prefix(k, 'repo_')
                     if k == 'clone_uri':
                         from rhodecode.model.validators import Missing
                         _change = kwargs.get('clone_uri_change')
                         if _change in [Missing, 'OLD']:
                             # we don't change the value, so use original one
                             val = cur_repo.clone_uri
 
                     setattr(cur_repo, k, val)
 
             new_name = cur_repo.get_new_name(kwargs['repo_name'])
             cur_repo.repo_name = new_name
 
             # if private flag is set, reset default permission to NONE
             if kwargs.get('repo_private'):
                 EMPTY_PERM = 'repository.none'
                 RepoModel().grant_user_permission(
                     repo=cur_repo, user=User.DEFAULT_USER, perm=EMPTY_PERM
                 )
 
             # handle extra fields
             for field in filter(lambda k: k.startswith(RepositoryField.PREFIX),
                                 kwargs):
                 k = RepositoryField.un_prefix_key(field)
                 ex_field = RepositoryField.get_by_key_name(
                     key=k, repo=cur_repo)
                 if ex_field:
                     ex_field.field_value = kwargs[field]
                     self.sa.add(ex_field)
             self.sa.add(cur_repo)
 
             if source_repo_name != new_name:
                 # rename repository
                 self._rename_filesystem_repo(
                     old=source_repo_name, new=new_name)
 
             return cur_repo
         except Exception:
             log.error(traceback.format_exc())
             raise
 
     def _create_repo(self, repo_name, repo_type, description, owner,
                      private=False, clone_uri=None, repo_group=None,
                      landing_rev='rev:tip', fork_of=None,
                      copy_fork_permissions=False, enable_statistics=False,
                      enable_locking=False, enable_downloads=False,
                      copy_group_permissions=False,
                      state=Repository.STATE_PENDING):
         """
         Create repository inside database with PENDING state, this should be
         only executed by create() repo. With exception of importing existing
         repos
         """
         from rhodecode.model.scm import ScmModel
 
         owner = self._get_user(owner)
         fork_of = self._get_repo(fork_of)
         repo_group = self._get_repo_group(safe_int(repo_group))
 
         try:
             repo_name = safe_unicode(repo_name)
             description = safe_unicode(description)
             # repo name is just a name of repository
             # while repo_name_full is a full qualified name that is combined
             # with name and path of group
             repo_name_full = repo_name
             repo_name = repo_name.split(Repository.NAME_SEP)[-1]
 
             new_repo = Repository()
             new_repo.repo_state = state
             new_repo.enable_statistics = False
             new_repo.repo_name = repo_name_full
             new_repo.repo_type = repo_type
             new_repo.user = owner
             new_repo.group = repo_group
             new_repo.description = description or repo_name
             new_repo.private = private
             new_repo.clone_uri = clone_uri
             new_repo.landing_rev = landing_rev
 
             new_repo.enable_statistics = enable_statistics
             new_repo.enable_locking = enable_locking
             new_repo.enable_downloads = enable_downloads
 
             if repo_group:
                 new_repo.enable_locking = repo_group.enable_locking
 
             if fork_of:
                 parent_repo = fork_of
                 new_repo.fork = parent_repo
 
             events.trigger(events.RepoPreCreateEvent(new_repo))
 
             self.sa.add(new_repo)
 
             EMPTY_PERM = 'repository.none'
             if fork_of and copy_fork_permissions:
                 repo = fork_of
                 user_perms = UserRepoToPerm.query() \
                     .filter(UserRepoToPerm.repository == repo).all()
                 group_perms = UserGroupRepoToPerm.query() \
                     .filter(UserGroupRepoToPerm.repository == repo).all()
 
                 for perm in user_perms:
                     UserRepoToPerm.create(
                         perm.user, new_repo, perm.permission)
 
                 for perm in group_perms:
                     UserGroupRepoToPerm.create(
                         perm.users_group, new_repo, perm.permission)
                 # in case we copy permissions and also set this repo to private
                 # override the default user permission to make it a private
                 # repo
                 if private:
                     RepoModel(self.sa).grant_user_permission(
                         repo=new_repo, user=User.DEFAULT_USER, perm=EMPTY_PERM)
 
             elif repo_group and copy_group_permissions:
                 user_perms = UserRepoGroupToPerm.query() \
                     .filter(UserRepoGroupToPerm.group == repo_group).all()
 
                 group_perms = UserGroupRepoGroupToPerm.query() \
                     .filter(UserGroupRepoGroupToPerm.group == repo_group).all()
 
                 for perm in user_perms:
                     perm_name = perm.permission.permission_name.replace(
                         'group.', 'repository.')
                     perm_obj = Permission.get_by_key(perm_name)
                     UserRepoToPerm.create(perm.user, new_repo, perm_obj)
 
                 for perm in group_perms:
                     perm_name = perm.permission.permission_name.replace(
                         'group.', 'repository.')
                     perm_obj = Permission.get_by_key(perm_name)
                     UserGroupRepoToPerm.create(
                         perm.users_group, new_repo, perm_obj)
 
                 if private:
                     RepoModel(self.sa).grant_user_permission(
                         repo=new_repo, user=User.DEFAULT_USER, perm=EMPTY_PERM)
 
             else:
                 perm_obj = self._create_default_perms(new_repo, private)
                 self.sa.add(perm_obj)
 
             # now automatically start following this repository as owner
             ScmModel(self.sa).toggle_following_repo(new_repo.repo_id,
                                                     owner.user_id)
 
             # we need to flush here, in order to check if database won't
             # throw any exceptions, create filesystem dirs at the very end
             self.sa.flush()
             events.trigger(events.RepoCreateEvent(new_repo))
             return new_repo
 
         except Exception:
             log.error(traceback.format_exc())
             raise
 
     def create(self, form_data, cur_user):
         """
         Create repository using celery tasks
 
         :param form_data:
         :param cur_user:
         """
         from rhodecode.lib.celerylib import tasks, run_task
         return run_task(tasks.create_repo, form_data, cur_user)
 
     def update_permissions(self, repo, perm_additions=None, perm_updates=None,
                            perm_deletions=None, check_perms=True,
                            cur_user=None):
         if not perm_additions:
             perm_additions = []
         if not perm_updates:
             perm_updates = []
         if not perm_deletions:
             perm_deletions = []
 
         req_perms = ('usergroup.read', 'usergroup.write', 'usergroup.admin')
 
         # update permissions
         for member_id, perm, member_type in perm_updates:
             member_id = int(member_id)
             if member_type == 'user':
                 # this updates also current one if found
                 self.grant_user_permission(
                     repo=repo, user=member_id, perm=perm)
             else:  # set for user group
                 # check if we have permissions to alter this usergroup
                 member_name = UserGroup.get(member_id).users_group_name
                 if not check_perms or HasUserGroupPermissionAny(
                         *req_perms)(member_name, user=cur_user):
                     self.grant_user_group_permission(
                         repo=repo, group_name=member_id, perm=perm)
 
         # set new permissions
         for member_id, perm, member_type in perm_additions:
             member_id = int(member_id)
             if member_type == 'user':
                 self.grant_user_permission(
                     repo=repo, user=member_id, perm=perm)
             else:  # set for user group
                 # check if we have permissions to alter this usergroup
                 member_name = UserGroup.get(member_id).users_group_name
                 if not check_perms or HasUserGroupPermissionAny(
                         *req_perms)(member_name, user=cur_user):
                     self.grant_user_group_permission(
                         repo=repo, group_name=member_id, perm=perm)
 
         # delete permissions
         for member_id, perm, member_type in perm_deletions:
             member_id = int(member_id)
             if member_type == 'user':
                 self.revoke_user_permission(repo=repo, user=member_id)
             else:  # set for user group
                 # check if we have permissions to alter this usergroup
                 member_name = UserGroup.get(member_id).users_group_name
                 if not check_perms or HasUserGroupPermissionAny(
                         *req_perms)(member_name, user=cur_user):
                     self.revoke_user_group_permission(
                         repo=repo, group_name=member_id)
 
     def create_fork(self, form_data, cur_user):
         """
         Simple wrapper into executing celery task for fork creation
 
         :param form_data:
         :param cur_user:
         """
         from rhodecode.lib.celerylib import tasks, run_task
         return run_task(tasks.create_repo_fork, form_data, cur_user)
 
     def delete(self, repo, forks=None, fs_remove=True, cur_user=None):
         """
         Delete given repository, forks parameter defines what do do with
         attached forks. Throws AttachedForksError if deleted repo has attached
         forks
 
         :param repo:
         :param forks: str 'delete' or 'detach'
         :param fs_remove: remove(archive) repo from filesystem
         """
         if not cur_user:
             cur_user = getattr(get_current_rhodecode_user(), 'username', None)
         repo = self._get_repo(repo)
         if repo:
             if forks == 'detach':
                 for r in repo.forks:
                     r.fork = None
                     self.sa.add(r)
             elif forks == 'delete':
                 for r in repo.forks:
                     self.delete(r, forks='delete')
             elif [f for f in repo.forks]:
                 raise AttachedForksError()
 
             old_repo_dict = repo.get_dict()
             events.trigger(events.RepoPreDeleteEvent(repo))
             try:
                 self.sa.delete(repo)
                 if fs_remove:
                     self._delete_filesystem_repo(repo)
                 else:
                     log.debug('skipping removal from filesystem')
                 old_repo_dict.update({
                     'deleted_by': cur_user,
                     'deleted_on': time.time(),
                 })
                 log_delete_repository(**old_repo_dict)
                 events.trigger(events.RepoDeleteEvent(repo))
             except Exception:
                 log.error(traceback.format_exc())
                 raise
 
     def grant_user_permission(self, repo, user, perm):
         """
         Grant permission for user on given repository, or update existing one
         if found
 
         :param repo: Instance of Repository, repository_id, or repository name
         :param user: Instance of User, user_id or username
         :param perm: Instance of Permission, or permission_name
         """
         user = self._get_user(user)
         repo = self._get_repo(repo)
         permission = self._get_perm(perm)
 
         # check if we have that permission already
         obj = self.sa.query(UserRepoToPerm) \
             .filter(UserRepoToPerm.user == user) \
             .filter(UserRepoToPerm.repository == repo) \
             .scalar()
         if obj is None:
             # create new !
             obj = UserRepoToPerm()
         obj.repository = repo
         obj.user = user
         obj.permission = permission
         self.sa.add(obj)
         log.debug('Granted perm %s to %s on %s', perm, user, repo)
         action_logger_generic(
             'granted permission: {} to user: {} on repo: {}'.format(
                 perm, user, repo), namespace='security.repo')
         return obj
 
     def revoke_user_permission(self, repo, user):
         """
         Revoke permission for user on given repository
 
         :param repo: Instance of Repository, repository_id, or repository name
         :param user: Instance of User, user_id or username
         """
 
         user = self._get_user(user)
         repo = self._get_repo(repo)
 
         obj = self.sa.query(UserRepoToPerm) \
             .filter(UserRepoToPerm.repository == repo) \
             .filter(UserRepoToPerm.user == user) \
             .scalar()
         if obj:
             self.sa.delete(obj)
             log.debug('Revoked perm on %s on %s', repo, user)
             action_logger_generic(
                 'revoked permission from user: {} on repo: {}'.format(
                     user, repo), namespace='security.repo')
 
     def grant_user_group_permission(self, repo, group_name, perm):
         """
         Grant permission for user group on given repository, or update
         existing one if found
 
         :param repo: Instance of Repository, repository_id, or repository name
         :param group_name: Instance of UserGroup, users_group_id,
             or user group name
         :param perm: Instance of Permission, or permission_name
         """
         repo = self._get_repo(repo)
         group_name = self._get_user_group(group_name)
         permission = self._get_perm(perm)
 
         # check if we have that permission already
         obj = self.sa.query(UserGroupRepoToPerm) \
             .filter(UserGroupRepoToPerm.users_group == group_name) \
             .filter(UserGroupRepoToPerm.repository == repo) \
             .scalar()
 
         if obj is None:
             # create new
             obj = UserGroupRepoToPerm()
 
         obj.repository = repo
         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)
         action_logger_generic(
             'granted permission: {} to usergroup: {} on repo: {}'.format(
                 perm, group_name, repo), namespace='security.repo')
 
         return obj
 
     def revoke_user_group_permission(self, repo, group_name):
         """
         Revoke permission for user group on given repository
 
         :param repo: Instance of Repository, repository_id, or repository name
         :param group_name: Instance of UserGroup, users_group_id,
             or user group name
         """
         repo = self._get_repo(repo)
         group_name = self._get_user_group(group_name)
 
         obj = self.sa.query(UserGroupRepoToPerm) \
             .filter(UserGroupRepoToPerm.repository == repo) \
             .filter(UserGroupRepoToPerm.users_group == group_name) \
             .scalar()
         if obj:
             self.sa.delete(obj)
             log.debug('Revoked perm to %s on %s', repo, group_name)
             action_logger_generic(
                 'revoked permission from usergroup: {} on repo: {}'.format(
                     group_name, repo), namespace='security.repo')
 
     def delete_stats(self, repo_name):
         """
         removes stats for given repo
 
         :param repo_name:
         """
         repo = self._get_repo(repo_name)
         try:
             obj = self.sa.query(Statistics) \
                 .filter(Statistics.repository == repo).scalar()
             if obj:
                 self.sa.delete(obj)
         except Exception:
             log.error(traceback.format_exc())
             raise
 
     def add_repo_field(self, repo_name, field_key, field_label, field_value='',
                        field_type='str', field_desc=''):
 
         repo = self._get_repo(repo_name)
 
         new_field = RepositoryField()
         new_field.repository = repo
         new_field.field_key = field_key
         new_field.field_type = field_type  # python type
         new_field.field_value = field_value
         new_field.field_desc = field_desc
         new_field.field_label = field_label
         self.sa.add(new_field)
         return new_field
 
     def delete_repo_field(self, repo_name, field_key):
         repo = self._get_repo(repo_name)
         field = RepositoryField.get_by_key_name(field_key, repo)
         if field:
             self.sa.delete(field)
 
     def _create_filesystem_repo(self, repo_name, repo_type, repo_group,
                                 clone_uri=None, repo_store_location=None,
                                 use_global_config=False):
         """
         makes repository on filesystem. It's group aware means it'll create
         a repository within a group, and alter the paths accordingly of
         group location
 
         :param repo_name:
         :param alias:
         :param parent:
         :param clone_uri:
         :param repo_store_location:
         """
         from rhodecode.lib.utils import is_valid_repo, is_valid_repo_group
         from rhodecode.model.scm import ScmModel
 
         if Repository.NAME_SEP in repo_name:
             raise ValueError(
                 'repo_name must not contain groups got `%s`' % repo_name)
 
         if isinstance(repo_group, RepoGroup):
             new_parent_path = os.sep.join(repo_group.full_path_splitted)
         else:
             new_parent_path = repo_group or ''
 
         if repo_store_location:
             _paths = [repo_store_location]
         else:
             _paths = [self.repos_path, new_parent_path, repo_name]
             # we need to make it str for mercurial
         repo_path = os.path.join(*map(lambda x: safe_str(x), _paths))
 
         # check if this path is not a repository
         if is_valid_repo(repo_path, self.repos_path):
             raise Exception('This path %s is a valid repository' % repo_path)
 
         # check if this path is a group
         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`',
                  repo_name, safe_unicode(repo_path),
                  obfuscate_url_pw(clone_uri))
 
         backend = get_backend(repo_type)
 
         config_repo = None if use_global_config else repo_name
         if config_repo and new_parent_path:
             config_repo = Repository.NAME_SEP.join(
                 (new_parent_path, config_repo))
         config = make_db_config(clear_session=False, repo=config_repo)
         config.set('extensions', 'largefiles', '')
 
         # patch and reset hooks section of UI config to not run any
         # hooks on creating remote repo
         config.clear_section('hooks')
 
         # TODO: johbo: Unify this, hardcoded "bare=True" does not look nice
         if repo_type == 'git':
             repo = backend(
                 repo_path, config=config, create=True, src_url=clone_uri,
                 bare=True)
         else:
             repo = backend(
                 repo_path, config=config, create=True, src_url=clone_uri)
 
         ScmModel().install_hooks(repo, repo_type=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):
         """
         renames repository on filesystem
 
         :param old: old name
         :param new: new name
         """
         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)
         if os.path.isdir(new_path):
             raise Exception(
                 'Was trying to rename to already existing dir %s' % new_path
             )
         shutil.move(old_path, new_path)
 
     def _delete_filesystem_repo(self, repo):
         """
         removes repo from filesystem, the removal is acctually made by
         added rm__ prefix into dir, and rename internat .hg/.git dirs so this
         repository is no longer valid for rhodecode, can be undeleted later on
         by reverting the renames on this repository
 
         :param repo: repo object
         """
         rm_path = os.path.join(self.repos_path, repo.repo_name)
         repo_group = repo.group
         log.info("Removing repository %s", rm_path)
         # disable hg/git internal that it doesn't get detected as repo
         alias = repo.repo_type
 
         config = make_db_config(clear_session=False)
         config.set('extensions', 'largefiles', '')
         bare = getattr(repo.scm_instance(config=config), 'bare', False)
 
         # skip this for bare git repos
         if not bare:
             # disable VCS repo
             vcs_path = os.path.join(rm_path, '.%s' % alias)
             if os.path.exists(vcs_path):
                 shutil.move(vcs_path, os.path.join(rm_path, 'rm__.%s' % alias))
 
         _now = datetime.now()
         _ms = str(_now.microsecond).rjust(6, '0')
         _d = 'rm__%s__%s' % (_now.strftime('%Y%m%d_%H%M%S_' + _ms),
                              repo.just_name)
         if repo_group:
             # if repository is in group, prefix the removal path with the group
             args = repo_group.full_path_splitted + [_d]
             _d = os.path.join(*args)
 
         if os.path.isdir(rm_path):
             shutil.move(rm_path, os.path.join(self.repos_path, _d))
 
 
 class ReadmeFinder:
     """
     Utility which knows how to find a readme for a specific commit.
 
     The main idea is that this is a configurable algorithm. When creating an
     instance you can define parameters, currently only the `default_renderer`.
     Based on this configuration the method :meth:`search` behaves slightly
     different.
     """
 
     readme_re = re.compile(r'^readme(\.[^\.]+)?$', re.IGNORECASE)
     path_re = re.compile(r'^docs?', re.IGNORECASE)
 
     default_priorities = {
         None: 0,
         '.text': 2,
         '.txt': 3,
         '.rst': 1,
         '.rest': 2,
         '.md': 1,
         '.mkdn': 2,
         '.mdown': 3,
         '.markdown': 4,
     }
 
     path_priority = {
         'doc': 0,
         'docs': 1,
     }
 
     FALLBACK_PRIORITY = 99
 
     RENDERER_TO_EXTENSION = {
         'rst': ['.rst', '.rest'],
         'markdown': ['.md', 'mkdn', '.mdown', '.markdown'],
     }
 
     def __init__(self, default_renderer=None):
         self._default_renderer = default_renderer
         self._renderer_extensions = self.RENDERER_TO_EXTENSION.get(
             default_renderer, [])
 
     def search(self, commit, path='/'):
         """
         Find a readme in the given `commit`.
         """
         nodes = commit.get_nodes(path)
         matches = self._match_readmes(nodes)
         matches = self._sort_according_to_priority(matches)
         if matches:
             return matches[0].node
 
         paths = self._match_paths(nodes)
         paths = self._sort_paths_according_to_priority(paths)
         for path in paths:
             match = self.search(commit, path=path)
             if match:
                 return match
 
         return None
 
     def _match_readmes(self, nodes):
         for node in nodes:
             if not node.is_file():
                 continue
             path = node.path.rsplit('/', 1)[-1]
             match = self.readme_re.match(path)
             if match:
                 extension = match.group(1)
                 yield ReadmeMatch(node, match, self._priority(extension))
 
     def _match_paths(self, nodes):
         for node in nodes:
             if not node.is_dir():
                 continue
             match = self.path_re.match(node.path)
             if match:
                 yield node.path
 
     def _priority(self, extension):
         renderer_priority = (
             0 if extension in self._renderer_extensions else 1)
         extension_priority = self.default_priorities.get(
             extension, self.FALLBACK_PRIORITY)
         return (renderer_priority, extension_priority)
 
     def _sort_according_to_priority(self, matches):
 
         def priority_and_path(match):
             return (match.priority, match.path)
 
         return sorted(matches, key=priority_and_path)
 
     def _sort_paths_according_to_priority(self, paths):
 
         def priority_and_path(path):
             return (self.path_priority.get(path, self.FALLBACK_PRIORITY), path)
 
         return sorted(paths, key=priority_and_path)
 
 
 class ReadmeMatch:
 
     def __init__(self, node, match, priority):
         self.node = node
         self._match = match
         self.priority = priority
 
     @property
     def path(self):
         return self.node.path
 
     def __repr__(self):
         return '<ReadmeMatch {} priority={}'.format(self.path, self.priority)