Dear fabric developers and users,
I have enjoyed working with fabric so far. However, wanting to automate a
distribution upgrade I ran into the problem of prompts that I wish to deal
with in an automated fashion, in line with issue 177 (
https://github.com/fabric/fabric/issues/177) Perhaps like this:
prompts = []
prompts += expect('*** release-upgrades','Y')
prompts += expect('*** sudoers','N')
prompts += expect('Do you want to continue?*Continue [yN]','y')
prompts += expect('the process cannot be cancelled.*Continue [yN]','y')
prompts += expect('packages are going to be removed.*Continue [yN]','y')
prompts += expect("the system will be restarted. *Continue [yN]",'N')
with expecting(prompts)
with prefix('export DEBIAN_FRONTEND=noninteractive'):
sudo('do-release-upgrade')
The expectations could be simple tuples, and the 'expecting' context
manager save these to the fabric state, i.e. env:
from fabric.state import env
def expect(promptexpr, response):
return (promptexpr, response)
def expecting(e)
return ExpectationContext(e)
class ExpectationContext(object):
def __init__(self,expectations):
self.expectations = expectations
def __enter__(self):
env.expectations = self.expectations
def __exit__(self, type, value, tb):
env.expectations = []
Now I looked into the fabric source, but it seems someone who is more
familiar and skilled than me could better find where to handle the expected
prompts, however, line 145 in io.py seems a good candidate:
else:
if is_expected(capture): # compares capture with
expectations
answer = answer_for(capture)
chan.sendall(answer + '\n') #sends respective response
back
This is probably to simply thought. Also I have no experience with Git,
which is my excuse for not sending this as a 'pull request'. What do you
think?
Jasper van den Bosch
PS this
blogger<http://penguinpython.com/blog/2011/05/upgrading-ubuntu-rackspace/>
solves
this issue with pexpect and fabric combined.
_______________________________________________
Fab-user mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/fab-user
