Convert the group id to the group name on this system

    gid
        gid to convert to a group name

    CLI Example:

    .. code-block:: bash

        salt '*' file.gid_to_group 0

def gid_to_group(gid):
    '''
    Convert the group id to the group name on this system

    gid
        gid to convert to a group name

    CLI Example:

    .. code-block:: bash

        salt '*' file.gid_to_group 0
    '''
    try:
        gid = int(gid)
    except ValueError:
        # This is not an integer, maybe it's already the group name?
        gid = group_to_gid(gid)

    if gid == '':
        # Don't even bother to feed it to grp
        return ''

    try:
        return grp.getgrgid(gid).gr_name
    except (KeyError, NameError):
        # If group is not present, fall back to the gid.
        return gid