def git_pull():
    """ Git Pull handler """
    app = get_app()
    if not have_git:
        session.flash = GIT_MISSING
        redirect(URL('site'))
    dialog = FORM.confirm(T('Pull'),
                          {T('Cancel'): URL('site')})
    if dialog.accepted:
        try:
            repo = git.Repo(os.path.join(apath(r=request), app))
            origin = repo.remotes.origin
            origin.fetch()
            origin.pull()
            session.flash = T("Application updated via git pull")
            redirect(URL('site'))

        except git.CheckoutError:
            session.flash = T("Pull failed, certain files could not be checked out. Check logs for details.")
            redirect(URL('site'))
        except git.UnmergedEntriesError:
            session.flash = T("Pull is not possible because you have unmerged files. Fix them up in the work tree, and then try again.")
            redirect(URL('site'))
        except git.GitCommandError:
            session.flash = T(
                "Pull failed, git exited abnormally. See logs for details.")
            redirect(URL('site'))
        except AssertionError:
            session.flash = T("Pull is not possible because you have unmerged files. Fix them up in the work tree, and then try again.")
            redirect(URL('site'))
    elif 'cancel' in request.vars:
        redirect(URL('site'))
    return dict(app=app, dialog=dialog)
dataset/ETHPy150Open uwdata/termite-data-server/web2py/applications-original/admin/controllers/default.py/git_pull/original