except:

        _ver = StrictVersion('0.0.0')

        stderr = traceback.format_exc()

    req_ver = '1.7.4'

    to_old_git = False

    if  _ver < StrictVersion(req_ver):

        to_old_git = True

    if 'git' in BACKENDS:

        log.debug('GIT version detected: %s' % stdout)

        if stderr:

        elif to_old_git:

            log.warning('RhodeCode detected git version %s, which is too old '

                        'for the system to function properly. Make sure '

                        'its version is at least %s' % (ver, req_ver))

    return _ver

@decorator.decorator

def jsonify(func, *args, **kwargs):

    """Action decorator that formats output for JSON

    Given a function that will return content, this decorator will turn

                    raise ChangesetError('%s have not been found' % curdir)

                # cache all items from the given traversed tree

                for item, stat, id in tree.iteritems():

                    if curdir:

                        name = '/'.join((curdir, item))

                    else:

                        name = item

                    self._paths[name] = id

                    self._stat_modes[name] = stat

            if not path in self._paths:

                raise NodeDoesNotExistError("There is no file nor directory "

                    % (path, self.short_id))

        return self._paths[path]

    def _get_kind(self, path):

        obj = self.repository._repo[self._get_id_for_path(path)]

        if isinstance(obj, objects.Blob):

            return NodeKind.FILE

        elif isinstance(obj, objects.Tree):

            return NodeKind.DIR

    def _get_filectx(self, path):

        path = self._fix_path(path)

        if self._get_kind(path) != NodeKind.FILE:

        return path

    def _get_file_nodes(self):

        return chain(*(t[2] for t in self.walk()))

    @LazyProperty

    def parents(self):

        """

        Returns list of parents changesets.

        """

        return [self.repository.get_changeset(parent)

                for parent in self._commit.parents]

            cwd=self.repository.path)

        buffer_size = 1024 * 8

        chunk = popen.stdout.read(buffer_size)

        while chunk:

            stream.write(chunk)

            chunk = popen.stdout.read(buffer_size)

        # Make sure all descriptors would be read

        popen.communicate()

    def get_nodes(self, path):

        if self._get_kind(path) != NodeKind.DIR:

        path = self._fix_path(path)

        id = self._get_id_for_path(path)

        tree = self.repository._repo[id]

        dirnodes = []

        filenodes = []

        als = self.repository.alias

        for name, stat, id in tree.iteritems():

            if objects.S_ISGITLINK(stat):

                dirnodes.append(SubModuleNode(name, url=None, changeset=id,

                                              alias=als))

                continue

                if isinstance(obj, objects.Tree):

                    if path == '':

                        node = RootNode(changeset=self)

                    else:

                        node = DirNode(path, changeset=self)

                    node._tree = obj

                elif isinstance(obj, objects.Blob):

                    node = FileNode(path, changeset=self)

                    node._blob = obj

                else:

                    raise NodeDoesNotExistError("There is no file nor directory "

                        % (path, self.short_id))

            # cache node

            self.nodes[path] = node

        return self.nodes[path]

    @LazyProperty

    def affected_files(self):

        """

        Get's a fast accessible file changes for given changeset

        """

        a, m, d = self._changes_cache

        return list(a.union(m).union(d))

        if len(self.revisions) == 0:

            raise EmptyRepositoryError("There are no changesets yet")

        if revision in (None, '', 'tip', 'HEAD', 'head', -1):

            revision = self.revisions[-1]

        if ((is_bstr(revision) and revision.isdigit() and len(revision) < 12)

            or isinstance(revision, int) or is_null(revision)):

            try:

                revision = self.revisions[int(revision)]

            except:

                    "for this repository" % (revision))

        elif is_bstr(revision):

            # get by branch/tag name

            _ref_revision = self._parsed_refs.get(revision)

            _tags_shas = self.tags.values()

            if _ref_revision:  # and _ref_revision[1] in ['H', 'RH', 'T']:

                return _ref_revision[0]

            # maybe it's a tag ? we don't have them in self.revisions

            elif revision in _tags_shas:

                return _tags_shas[_tags_shas.index(revision)]

            elif not pattern.match(revision) or revision not in self.revisions:

                    "for this repository" % (revision))

        # Ensure we return full id

        if not pattern.match(str(revision)):

                % revision)

        return revision

    def _get_archives(self, archive_name='tip'):

        for i in [('zip', '.zip'), ('gz', '.tar.gz'), ('bz2', '.tar.bz2')]:

                yield {"type": i[0], "extension": i[1], "node": archive_name}

    def _get_url(self, url):

        """

        Returns normalized url. If schema is not given, would fall to

        filesystem (``file:///``) schema.

        if path.endswith('/'):

            path = path.rstrip('/')

        return safe_str(path)

    def _get_kind(self, path):

        path = self._fix_path(path)

        if path in self._file_paths:

            return NodeKind.FILE

        elif path in self._dir_paths:

            return NodeKind.DIR

        else:

                % (path))

    def _get_filectx(self, path):

        path = self._fix_path(path)

        if self._get_kind(path) != NodeKind.FILE:

        return self._ctx.filectx(path)

    def _extract_submodules(self):

        """

        returns a dictionary with submodule information from substate file

        of hg repository

        """

        return self._ctx.substate

    def get_file_mode(self, path):

        """

        Returns stat mode of the file at the given ``path``.

            stream = open(stream.name, 'rb')

        else:

            stream.seek(0)

    def get_nodes(self, path):

        """

        Returns combined ``DirNode`` and ``FileNode`` objects list representing

        state of changeset at the given ``path``. If node at the given ``path``

        is not instance of ``DirNode``, ChangesetError would be raised.

        """

        if self._get_kind(path) != NodeKind.DIR:

        path = self._fix_path(path)

        filenodes = [FileNode(f, changeset=self) for f in self._file_paths

            if os.path.dirname(f) == path]

        dirs = path == '' and '' or [d for d in self._dir_paths

            if d and posixpath.dirname(d) == path]

        dirnodes = [DirNode(d, changeset=self) for d in dirs

            if os.path.dirname(d) == path]

        als = self.repository.alias

        for k, vals in self._extract_submodules().iteritems():

            #vals = url,rev,type

        path = self._fix_path(path)

        if not path in self.nodes:

            if path in self._file_paths:

                node = FileNode(path, changeset=self)

            elif path in self._dir_paths or path in self._dir_paths:

                if path == '':

                    node = RootNode(changeset=self)

                else:

                    node = DirNode(path, changeset=self)

            else:

                raise NodeDoesNotExistError("There is no file nor directory "

                    % (path, self.short_id))

            # cache node

            self.nodes[path] = node

        return self.nodes[path]

    @LazyProperty

    def affected_files(self):

        """

        Get's a fast accessible file changes for given changeset

        """

        return self._ctx.files()

        :param revision: str or int or None

        """

        if self._empty:

            raise EmptyRepositoryError("There are no changesets yet")

        if revision in [-1, 'tip', None]:

            revision = 'tip'

        try:

            revision = hex(self._repo.lookup(revision))

        except (IndexError, ValueError, RepoLookupError, TypeError):

                                    "exist for this repository"

                                    % (revision))

        return revision

    def _get_archives(self, archive_name='tip'):

        allowed = self.baseui.configlist("web", "allow_archive",

                                         untrusted=True)

        for i in [('zip', '.zip'), ('gz', '.tar.gz'), ('bz2', '.tar.bz2')]:

            if i[0] in allowed or self._repo.ui.configbool("web",

                                                           "allow" + i[0],

                                                           untrusted=True):

                yield {"type": i[0], "extension": i[1], "node": archive_name}

        self.assertEqual(response.content_type, "text/x-python")

    def test_raw_file_wrong_cs(self):

        self.log_user()

        rev = u'ERRORce30c96924232dffcd24178a07ffeb5dfc'

        f_path = 'vcs/nodes.py'

        response = self.app.get(url(controller='files', action='rawfile',

                                    repo_name=HG_REPO,

                                    revision=rev,

                                    f_path=f_path))

        self.checkSessionFlash(response, msg)

        self.assertEqual('http://localhost/%s/files/tip/' % HG_REPO, response.headers['location'])

    def test_raw_file_wrong_f_path(self):

        self.log_user()

        rev = '27cd5cce30c96924232dffcd24178a07ffeb5dfc'

        f_path = 'vcs/ERRORnodes.py'

        response = self.app.get(url(controller='files', action='rawfile',

                                    repo_name=HG_REPO,

                                    revision=rev,

                                    f_path=f_path))

        self.checkSessionFlash(response, msg)

    #==========================================================================

    # RAW RESPONSE - PLAIN

    #==========================================================================

    def test_raw_ok(self):

        self.log_user()

        response = self.app.get(url(controller='files', action='raw',

                                    repo_name=HG_REPO,

                                    revision='27cd5cce30c96924232dffcd24178a07ffeb5dfc',

                                    f_path='vcs/nodes.py'))

        self.assertEqual(response.content_type, "text/plain")

    def test_raw_wrong_cs(self):

        self.log_user()

        rev = u'ERRORcce30c96924232dffcd24178a07ffeb5dfc'

        f_path = 'vcs/nodes.py'

        response = self.app.get(url(controller='files', action='raw',

                                    repo_name=HG_REPO,

                                    revision=rev,

                                    f_path=f_path))

        self.checkSessionFlash(response, msg)

        self.assertEqual('http://localhost/%s/files/tip/' % HG_REPO, response.headers['location'])

    def test_raw_wrong_f_path(self):

        self.log_user()

        rev = '27cd5cce30c96924232dffcd24178a07ffeb5dfc'

        f_path = 'vcs/ERRORnodes.py'

        response = self.app.get(url(controller='files', action='raw',

                                    repo_name=HG_REPO,

                                    revision=rev,

                                    f_path=f_path))

        self.checkSessionFlash(response, msg)

    def test_ajaxed_files_list(self):

        self.log_user()

        rev = '27cd5cce30c96924232dffcd24178a07ffeb5dfc'

        response = self.app.get(

            url('files_nodelist_home', repo_name=HG_REPO,f_path='/',revision=rev),

            extra_environ={'HTTP_X_PARTIAL_XHR': '1'},

        )

        response.mustcontain("vcs/web/simplevcs/views/repository.py")