How to expect eof with expect+pty

Ruby
1

using gnupg to encrypt a file with only a passphrase.

prompt> echo ‘hello world’ >> test
prompt> gpg -c test
Enter passphrase:
Repeat passphrase:
prompt>

note: I have not shown the many backspaces.

however if there already exists a ‘test.gpg’ file
then there is third question.

prompt> echo ‘hello world’ >> test
prompt> gpg -c test
Enter passphrase:
Repeat passphrase:
File `test.gpg’ exists. Overwrite? (y/N)

I want to listen for:
'Enter passphrase: ’
'Repeat passphrase: ’
eof?

In case I get something else than eof? then
I want to raise an error.

–
Simon S.

File.open(“test”, “a+”) do |f|
500000.times { f.write(“helloworld”) }
end

require ‘pty’
require ‘expect’
PTY.spawn(“gpg -c test”) do |r,w,pid|
w.sync = true
r.expect("Enter passphrase: ", 1) do |e|
raise unless e
w.puts “secretpassword”
end
r.expect("Repeat passphrase: ", 1) do |e|
raise unless e
w.puts “secretpassword”
end

puts “eof=#{r.eof}”

how to read eventual data

how to expect eof?

end

system(‘ls test*’)

output when running the program

prompt> ruby a.rb
eof=false
test test.gpg
prompt>

2

On 12/20/06, Simon S. [email protected] wrote:
[snip]

I want to listen for:
'Enter passphrase: ’
'Repeat passphrase: ’
eof?
[snip]

Ok I got a partial solution… now it would be nice if I could access
the string accumlated in readlines when this thing timeouts.

–
Simon S.

File.open(“test”, “a+”) do |f|
500000.times { f.write(“helloworld”) }
end

require ‘expect’
require ‘timeout’
require ‘pty’

timeout(3) do
PTY.spawn(“gpg -c test”) do |r,w,pid|
w.sync = true
r.expect("Enter passphrase: ", 1) do |e|
raise unless e
w.puts “secretpassword”
end
r.expect("Repeat passphrase: ", 1) do |e|
raise unless e
w.puts “secretpassword”
end

r.readlines
puts "eof=#{r.eof}"

end
end

system(‘ls test*’)