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welcome.py
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welcome.py
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#!/usr/bin/env python3
# vim:ts=4:sts=4:sw=4:et
#
# Author: Hari Sekhon
# Date: 2009-12-09 19:58:14 +0000 (Wed, 09 Dec 2009)
#
# https://github.com/HariSekhon/DevOps-Python-tools
#
# License: see accompanying Hari Sekhon LICENSE file
#
# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback
# to help improve or steer this or other code I publish
#
# https://www.linkedin.com/in/HariSekhon
#
"""
Prints a slick welcome message with last login time
Tested on Mac OS X and Linux
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# from __future__ import unicode_literals
import getpass
import os
import random
import re
import string
import sys
import time
libdir = os.path.abspath(os.path.join(os.path.dirname(__file__), 'pylib'))
sys.path.append(libdir)
try:
# pylint: disable=wrong-import-position
from harisekhon.utils import ERRORS, isUser, which, printerr
from harisekhon import CLI
except ImportError as _:
print('module import failed: %s' % _, file=sys.stderr)
print("Did you remember to build the project by running 'make'?", file=sys.stderr)
print("Alternatively perhaps you tried to copy this program out without it's adjacent libraries?", file=sys.stderr)
sys.exit(4)
__author__ = 'Hari Sekhon'
__version__ = '2.0.4'
class Welcome(CLI):
def __init__(self):
# Python 2.x
super(Welcome, self).__init__()
# Python 3.x
# super().__init__()
self.quick = False
self.timeout_default = 20
@staticmethod
def titlecase_user(user):
if user == 'root':
user = user.upper()
elif len(user) < 4 or re.search(r'\d', user):
# probably not a real name
pass
else:
user = user.title()
return user
def construct_msg(self):
# user = os.getenv('USER', '').strip()
user = getpass.getuser()
if not isUser(user):
# print("invalid user '%s' determined from environment variable $USER, failed regex validation" % user)
print("invalid user '%s' returned by getpass.getuser(), failed regex validation" % user)
sys.exit(ERRORS['CRITICAL'])
user = self.titlecase_user(user)
msg = 'Welcome %s - ' % user
last = ''
if which("last"):
_ = os.popen('last -100')
_.readline()
re_skip = re.compile(r'^(?:reboot|wtmp)|^\s*$')
last = ''
for line in _:
last = line.rstrip('\n')
if re_skip.match(last):
last = ''
continue
break
_.close()
else:
printerr("WARNING: 'last' command not found, will not be able to get last login information")
if last:
msg += 'last login was '
last_user = re.sub(r'\s+.*$', '', last)
if last_user == 'root':
last_user = 'ROOT'
# strip up to "Day Mon NN" ie "%a %b %e ..."
(last, num_replacements) = re.subn(r'.*(\w{3}\s+\w{3}\s+\d+)', r'\g<1>', last)
if not num_replacements:
print('failed to find the date format in the last log')
sys.exit(ERRORS['CRITICAL'])
last = re.sub(' *$', '', last)
if last_user == 'ROOT':
msg += 'ROOT'
elif last_user.lower() == user.lower():
msg += 'by you'
else:
msg += 'by %s' % last_user
msg += ' => %s' % last
else:
msg += 'no last login information available!'
return msg
def print_welcome(self):
msg = self.construct_msg()
if self.quick:
print(msg)
return
try:
charmap = list(string.ascii_uppercase + string.ascii_lowercase + '@#$%^&*()')
# print '',
# print('', end='')
for i in range(0, len(msg)):
char = msg[i]
# print '',
print(' ', end='')
j = 0
while 1:
if j > 3:
random_char = char
else:
random_char = random.choice(charmap)
# going from print statement to func requires one less backspace otherwise it scrolls backwards
# print '\b\b%s' % random_char,
print('\b%s' % random_char, end='')
sys.stdout.flush()
if char == random_char:
break
j += 1
time.sleep(0.0085)
print()
except KeyboardInterrupt:
# print('\b\b\b\b%s' % msg[i:])
print('\b\b\b%s' % msg[i:])
def add_options(self):
self.add_opt('-q', '--quick', action='store_true', default=False,
help='Print instantly without fancy scrolling effect, saves 2-3 seconds ' +\
'(you can also Control-C to make output complete instantly)')
def run(self):
self.quick = self.get_opt('quick')
if self.args:
self.usage()
self.print_welcome()
if __name__ == '__main__':
Welcome().main()