CODEWITHSUNDEEP
pythonbashshell
Andriy
Andriy

Reputation: 311

Simulate pressing "yes" after few "Enter" within bash command

While generating key/cert you should press few times 'enter' and in the very end press "yes". How to do it in code like this?

buildkey = ["printf '\n\n\n\n\n\n\n\n\n\n ' | /etc/openvpn/easy-rsa/build-key"]
runBuildKey = subprocess.Popen(buildkey, shell=True )

Upvotes: 0

Views: 432

Answers (1)

Charles Duffy
Charles Duffy

Reputation: 295472

Don't try to edit stdin at all here. Instead, open up your openssl.cnf, and modify it to get all the input you need from the environment, like so:

[ req_distinguished_name ]
countryName_default             = $ENV::SSL_countryName
stateOrProvinceName_default     = $ENV::SSL_stateOrProvinenceName

...and so forth. Once this is done, set the variables in your environment before calling build-key with the argument -batch. In bash, that might look like so:

SSL_countryName=foo SSL_stateOrProvinenceName=bar build-key -batch </dev/null

Alternately, in Python, you can do the same thing via arguments to subprocess.Popen:

subprocess.call(['/etc/openvpn/easy-rsa/build-key', '-batch'], env={
    'SSL_countryName': 'foo',
    'SSL_stateOrProvinenceName': 'bar',
    # ...and so forth for any other $ENV::* setting you want to override
}, stdin=open('/dev/null', 'r'))

However, if you really want to pass a custom stream through for stdin, you can do that -- without any shell pipeline at all:

p = subprocess.Popen(['/etc/openvpn/easy-rsa/build-key'], stdin=subprocess.PIPE)
p.communicate('\n'.join(['', '', '', '', '', 'yes', '']))
#                        ^^
#   use one of these for each item you want to press enter to before the "yes"

Upvotes: 3

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