Need Little Assistance With Pexpect Interaction

Need little assistance with making this code work with pexpect module. This code executes git pull by logging into a server and then downloads the latest code (if upgrade is availa

Solution 1:

This logic seems to be a bit incorrect.

At first: you are expecting from a set of prompts

i = p.expect(['password:','Already up-to-date.',pexpect.EOF])

Which works correctly as password prompt is first to be sent. Then even if you receive the prompt - 'Already up-to-date.'

you have altered pexpect to check for 'password denied'

output = p.expect('Permission denied')

I believe that any point only one of the expect lines are active. Also you can not set expectations after a prompt has occurred.

You have to alter the script to sequentially check on the expected lines

i = p.expect(['password:','Already up-to-date.','Permission denied', pexpect.EOF])
ifi== 0:
   .... send passwordi= p.expect(['password:','Already up-to-date.','Permission denied', pexpect.EOF])
ifi== 2:
   .... send passwordi= p.expect(['password:','Already up-to-date.','Permission denied', pexpect.EOF])
ifi== 1:
   .... print "already updated"
   i = p.expect(['password:','Already up-to-date.','Permission denied', pexpect.EOF])
ifi== 3:
   .... print output

Basically, you have at any point only one active expect command active. if you are expecting a line "xyz" and it receives "123". It will just time out waiting for "xyz".