casa5

import errno

import os

import pwd

​

def get_user():

    # Seen in

    # http://cr.opensolaris.org/~migi/24_09_os_unix_using_osgetlogin_3595/test1.py

    def __get_username():

        # Cron jobs, at least in Ubuntu, are more likely to have LOGNAME set

        # than USER.

        #

        # Note that environment variables are easily forged...

        #

        user = os.getenv('USER') or os.getenv('LOGNAME') or \

               os.getenv('USERNAME')

​

        if not user:

            # ...but when su is being used it's hard to tell in advance

            # whether the uid or euid is wanted.

            return pwd.getpwuid(os.getuid()).pw_name

​

        return user

​

    try:

        # os.getlogin() is limited to whatever POSIX getlogin() does.

        return os.getlogin()

    except AttributeError:

        # os.getlogin() not available on this platform.

        return __get_username()

    except OSError, e:

        if e.errno == errno.ENOTTY:

            # Known failure case for gksu.

            return __get_username()

        else:

            # In most cases, just do an os.getlogin() yourself if you want to see the error.

            #print "os.getlogin() raised exception", e

            #print "get_user() is using __get_username() instead of os.getlogin()."

            return __get_username()

        #raise