interactive shell not blocking on shell input

[lubars]

When I open an interactive session like this, some interactive prompts acts as if they've encountered EOF:

Shell shell = new com.jcabi.ssh.SSH(addr, port, user, key);
int exitValue = shell.exec("bash -i", System.in, System.out, System.err);

Example: "yum install httpd"

$ ./test-jcabi
[centos@localhost ~]$ sudo yum install httpd
Install  1 Package (+4 Dependent packages)
Total download size: 3.0 M
Installed size: 10 M
Is this ok [y/d/N]: Exiting on user command        <-- doesn't block on input
[centos@localhost ~]$

If I run with just "bash" (not "bash -i"), the shell blocks on input correctly, but the prompt doesn't appear until after the input is provided (and there's no shell prompt either):

$ ./test-jcabi
sudo yum install httpd
Install  1 Package (+4 Dependent packages)
Total download size: 3.0 M
Installed size: 10 M
y                             <-- answering before prompt appears
Is this ok [y/d/N]: Downloading packages:
Complete!

I tried wrapping the command in /usr/bin/script to create a valid tty, prepending TERM=xterm, and the piped input/output scheme in this issue, but the result was the same. Any help would be appreciated.

[0crat]

@yegor256 please, pay attention to this issue

[yegor256]

@lubars I guess you just need this flag for yum: -y See https://serverfault.com/questions/442088/how-do-you-answer-yes-for-yum-install-automatically

[lubars]

Hi @yegor256. In this case there is a way around it, but I'm seeing this behavior with other interactive applications, and was hoping to come up with a more general solution. Thanks for the reply -

[Lordan]

@yegor256 any plans to work on this? I run into problems as well with a rather verbose command which prompts for an input and I couldn't find a way to send the needed input at the right moment. Any example how to read the output until the prompt appears and respond with e.g. 'Y' would be very welcome.

[j-dimension]

@j-dimension