# GIT REQUEST HANDLING

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

        repo_path = os.path.join(safe_str(self.basepath), safe_str(repo_name))

        log.debug('Repository path is %s' % repo_path)

        baseui = make_ui('db')

        for k, v in extras.items():

            baseui.setconfig('rhodecode_extras', k, v)

        try:

            # invalidate cache on push

            if action == 'push':

                self._invalidate_cache(repo_name)

            self._handle_githooks(action, baseui, environ)

            log.info('%s action on GIT repo "%s"' % (action, repo_name))

            app = self.__make_app(repo_name, repo_path)

            return app(environ, start_response)

        except Exception:

            log.error(traceback.format_exc())

            return HTTPInternalServerError()(environ, start_response)

    def __make_app(self, repo_name, repo_path):

        """

        Make an wsgi application using dulserver

        :param repo_name: name of the repository

        :param repo_path: full path to the repository

        """

        _d = {'/' + repo_name: Repo(repo_path)}

        backend = dulserver.DictBackend(_d)

        gitserve = make_wsgi_chain(backend)

        return gitserve

    def __get_repository(self, environ):

        """

        Get's repository name out of PATH_INFO header

        :param environ: environ where PATH_INFO is stored

        """

        try:

            environ['PATH_INFO'] = self._get_by_id(environ['PATH_INFO'])

            repo_name = GIT_PROTO_PAT.match(environ['PATH_INFO']).group(1)

        except:

            log.error(traceback.format_exc())

            raise

        return repo_name

    def __get_user(self, username):

        return User.get_by_username(username)

    def __get_action(self, environ):

        """

        Maps git request commands into a pull or push command.

        :param environ:

        """

        service = environ['QUERY_STRING'].split('=')

        if len(service) > 1:

            service_cmd = service[1]

            mapping = {

                'git-receive-pack': 'push',

                'git-upload-pack': 'pull',

            }

            op = mapping[service_cmd]

            self._git_stored_op = op

            return op

        else:

            # try to fallback to stored variable as we don't know if the last

            # operation is pull/push

            op = getattr(self, '_git_stored_op', 'pull')

        return op

    def _handle_githooks(self, action, baseui, environ):

        from rhodecode.lib.hooks import log_pull_action, log_push_action

        service = environ['QUERY_STRING'].split('=')

        if len(service) < 2:

            return

        class cont(object):

            pass

        repo = cont()

        setattr(repo, 'ui', baseui)

        push_hook = 'pretxnchangegroup.push_logger'

        pull_hook = 'preoutgoing.pull_logger'

        _hooks = dict(baseui.configitems('hooks')) or {}

        if action == 'push' and _hooks.get(push_hook):

            log_push_action(ui=baseui, repo=repo)

        elif action == 'pull' and _hooks.get(pull_hook):

            log_pull_action(ui=baseui, repo=repo)

    age_seconds = (age.days * agescales[2][1]) + age.seconds

    pos = 1

    for scale in agescales:

        if scale[1] <= age_seconds:

            if pos == 6:

                pos = 5

            return '%s %s' % (time_ago_in_words(curdate,

                                                agescales[pos][0]), _('ago'))

        pos += 1

    return _(u'just now')

def uri_filter(uri):

    """

    Removes user:password from given url string

    :param uri:

    :rtype: unicode

    :returns: filtered list of strings

    """

    if not uri:

        return ''

    proto = ''

    for pat in ('https://', 'http://'):

        if uri.startswith(pat):

            uri = uri[len(pat):]

            proto = pat

            break

    # remove passwords and username

    uri = uri[uri.find('@') + 1:]

    # get the port

    cred_pos = uri.find(':')

    if cred_pos == -1:

        host, port = uri, None

    else:

        host, port = uri[:cred_pos], uri[cred_pos + 1:]

    return filter(None, [proto, host, port])

def credentials_filter(uri):

    """

    Returns a url with removed credentials

    :param uri:

    """

    uri = uri_filter(uri)

    #check if we have port

    if len(uri) > 2 and uri[2]:

        uri[2] = ':' + uri[2]

    return ''.join(uri)

def get_changeset_safe(repo, rev):

    """

    Safe version of get_changeset if this changeset doesn't exists for a

    repo it returns a Dummy one instead

    :param repo:

    :param rev:

    """

    from rhodecode.lib.vcs.backends.base import BaseRepository

    from rhodecode.lib.vcs.exceptions import RepositoryError

    if not isinstance(repo, BaseRepository):

        raise Exception('You must pass an Repository '

                        'object as first argument got %s', type(repo))

    try:

        cs = repo.get_changeset(rev)

    except RepositoryError:

        from rhodecode.lib.utils import EmptyChangeset

        cs = EmptyChangeset(requested_revision=rev)

    return cs

MENTIONS_REGEX = r'(?:^@|\s@)([a-zA-Z0-9]{1}[a-zA-Z0-9\-\_\.]+)(?:\s{1})'

def extract_mentioned_users(s):

    """

    Returns unique usernames from given string s that have @mention

    :param s: string to get mentions

    """

    usrs = set()

    for username in re.findall(MENTIONS_REGEX, s):

        usrs.add(username)

    return sorted(list(usrs), key=lambda k: k.lower())

"""

Mercurial libs compatibility

"""

from mercurial import archival, merge as hg_merge, patch, ui

from mercurial.commands import clone, nullid, pull

from mercurial.context import memctx, memfilectx

from mercurial.error import RepoError, RepoLookupError, Abort

from mercurial.hgweb.common import get_contact

from mercurial.localrepo import localrepository

from mercurial.match import match

from mercurial.mdiff import diffopts

from mercurial.node import hex