def check_git_version():

    """

    Checks what version of git is installed in system, and issues a warning

    if it's too old for RhodeCode to properly work.

    """

    import subprocess

    from distutils.version import StrictVersion

    from rhodecode import BACKENDS

    p = subprocess.Popen('git --version', shell=True,

                        stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    stdout, stderr = p.communicate()

    ver = (stdout.split(' ')[-1] or '').strip() or '0.0.0'

    if len(ver.split('.')) > 3:

        #StrictVersion needs to be only 3 element type

        ver = '.'.join(ver.split('.')[:3])

    try:

        _ver = StrictVersion(ver)

    except:

        _ver = StrictVersion('0.0.0')

        stderr = traceback.format_exc()

    req_ver = '1.7.4'

    to_old_git = False

        to_old_git = True

    if 'git' in BACKENDS:

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

        if stderr:

            log.warning('Unable to detect git version org error was:%r' % 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