if repo.enable_locking and repo.locked[0]:

            h.flash(_('This repository is has been locked by %s on %s')

                % (h.person_by_id(repo.locked[0]),

                   h.fmt_date(h.time_to_datetime(repo.locked[1]))),

                'warning')

            return redirect(h.url('files_home',

                                  repo_name=repo_name, revision='tip'))

        # check if revision is a branch identifier- basically we cannot

        # create multiple heads via file editing

        _branches = repo.scm_instance.branches

        # check if revision is a branch name or branch hash

        if revision not in _branches.keys() + _branches.values():

            h.flash(_('You can only edit files with revision '

                      'being a valid branch '), category='warning')

            return redirect(h.url('files_home',

                                  repo_name=repo_name, revision='tip',

                                  f_path=f_path))

        r_post = request.POST

        c.cs = self.__get_cs_or_redirect(revision, repo_name)

        c.file = self.__get_filenode_or_redirect(repo_name, c.cs, f_path)

        if c.file.is_binary:

            return redirect(url('files_home', repo_name=c.repo_name,

                            revision=c.cs.raw_id, f_path=f_path))

        c.default_message = _('Edited file %s via RhodeCode') % (f_path)

        c.f_path = f_path

        if r_post:

            old_content = c.file.content

            sl = old_content.splitlines(1)

            first_line = sl[0] if sl else ''

            # modes:  0 - Unix, 1 - Mac, 2 - DOS

            mode = detect_mode(first_line, 0)

            content = convert_line_endings(r_post.get('content', ''), mode)

            message = r_post.get('message') or c.default_message

            author = self.rhodecode_user.full_contact

            if content == old_content:

                h.flash(_('No changes'), category='warning')

                return redirect(url('changeset_home', repo_name=c.repo_name,

                                    revision='tip'))

            try:

                self.scm_model.commit_change(repo=c.rhodecode_repo,

                                             repo_name=repo_name, cs=c.cs,

                                             user=self.rhodecode_user.user_id,

                                             author=author, message=message,

                                             content=content, f_path=f_path)

                h.flash(_('Successfully committed to %s') % f_path,

                        category='success')

            except Exception:

                log.error(traceback.format_exc())

                h.flash(_('Error occurred during commit'), category='error')

            return redirect(url('changeset_home',

                                repo_name=c.repo_name, revision='tip'))

        return render('files/files_edit.html')

    @LoginRequired()

    @HasRepoPermissionAnyDecorator('repository.write', 'repository.admin')

    def add(self, repo_name, revision, f_path):

        repo = Repository.get_by_repo_name(repo_name)

        if repo.enable_locking and repo.locked[0]:

            h.flash(_('This repository is has been locked by %s on %s')

                % (h.person_by_id(repo.locked[0]),

                   h.fmt_date(h.time_to_datetime(repo.locked[1]))),

                  'warning')

            return redirect(h.url('files_home',

                                  repo_name=repo_name, revision='tip'))

        r_post = request.POST

        c.cs = self.__get_cs_or_redirect(revision, repo_name,

                                         redirect_after=False)

        if c.cs is None:

            c.cs = EmptyChangeset(alias=c.rhodecode_repo.alias)

        c.default_message = (_('Added file via RhodeCode'))

        c.f_path = f_path

        if r_post:

            unix_mode = 0

            content = convert_line_endings(r_post.get('content', ''), unix_mode)

            message = r_post.get('message') or c.default_message

            filename = r_post.get('filename')

            location = r_post.get('location', '')

            file_obj = r_post.get('upload_file', None)

            if file_obj is not None and hasattr(file_obj, 'filename'):

                filename = file_obj.filename

                content = file_obj.file

            if not content:

                h.flash(_('No content'), category='warning')

                return redirect(url('changeset_home', repo_name=c.repo_name,

                                    revision='tip'))

            if not filename:

                h.flash(_('No filename'), category='warning')

                return redirect(url('changeset_home', repo_name=c.repo_name,

                                    revision='tip'))

            #strip all crap out of file, just leave the basename

            filename = os.path.basename(filename)

            node_path = os.path.join(location, filename)

            author = self.rhodecode_user.full_contact

            try:

                nodes = {

                    node_path: {

                        'content': content

                    }

                }

                self.scm_model.create_nodes(

                    user=c.rhodecode_user.user_id, repo=c.rhodecode_db_repo,

                    message=message,

                    nodes=nodes,

                    parent_cs=c.cs,

                    author=author,

                )

                h.flash(_('Successfully committed to %s') % node_path,

                        category='success')

            except NonRelativePathError, e:

                h.flash(_('Location must be relative path and must not '

                          'contain .. in path'), category='warning')

                return redirect(url('changeset_home', repo_name=c.repo_name,

                                    revision='tip'))

            except (NodeError, NodeAlreadyExistsError), e:

                h.flash(_(e), category='error')

            except Exception:

                log.error(traceback.format_exc())

                h.flash(_('Error occurred during commit'), category='error')

            return redirect(url('changeset_home',

                                repo_name=c.repo_name, revision='tip'))

        return render('files/files_add.html')

    @LoginRequired()

    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',

                                   'repository.admin')

    def archivefile(self, repo_name, fname):

        fileformat = None

        revision = None

        ext = None

        subrepos = request.GET.get('subrepos') == 'true'

        for a_type, ext_data in settings.ARCHIVE_SPECS.items():

            archive_spec = fname.split(ext_data[1])

            if len(archive_spec) == 2 and archive_spec[1] == '':

                fileformat = a_type or ext_data[1]

                revision = archive_spec[0]

                ext = ext_data[1]

        try:

            dbrepo = RepoModel().get_by_repo_name(repo_name)

            if not dbrepo.enable_downloads:

                return _('Downloads disabled')

            if c.rhodecode_repo.alias == 'hg':

                # patch and reset hooks section of UI config to not run any

                # hooks on fetching archives with subrepos

                for k, v in c.rhodecode_repo._repo.ui.configitems('hooks'):

                    c.rhodecode_repo._repo.ui.setconfig('hooks', k, None)

            cs = c.rhodecode_repo.get_changeset(revision)

            content_type = settings.ARCHIVE_SPECS[fileformat][0]

        except ChangesetDoesNotExistError:

            return _('Unknown revision %s') % revision

        except EmptyRepositoryError:

            return _('Empty repository')

        except (ImproperArchiveTypeError, KeyError):

            return _('Unknown archive type')

        # archive cache

        from rhodecode import CONFIG

        rev_name = cs.raw_id[:12]

        archive_name = '%s-%s%s' % (safe_str(repo_name.replace('/', '_')),

                                    safe_str(rev_name), ext)

        use_cached_archive = False  # defines if we use cached version of archive

        archive_cache_enabled = CONFIG.get('archive_cache_dir')

        if not subrepos and archive_cache_enabled:

            #check if we it's ok to write

            if not os.path.isdir(CONFIG['archive_cache_dir']):

                os.makedirs(CONFIG['archive_cache_dir'])

            cached_archive_path = os.path.join(CONFIG['archive_cache_dir'], archive_name)

            if os.path.isfile(cached_archive_path):

                log.debug('Found cached archive in %s' % cached_archive_path)

                fd, archive = None, cached_archive_path