Is there any way i can get a login shell in ruby using net-ssh? Is that even possible?
By login shell i mean the ones the source /etc/profile..
2 Answers
Net-SSH is too low level to simply provide this up front (the way it is now, anyways). You can check out Net-SSH-Shell which builds upon Net-SSH to add login shell functionality: https://github.com/mitchellh/net-ssh-shell
The implementation is solid and works, however I found its not too useful since you can't specifically extract things like stderr or exit status because the commands run in a sub-shell, so you can only get stdout. The net-ssh-shell library uses some hacks to get the exit status.
I've needed a "login shell" for my own Ruby projects and to do this I've generally executed things directly into the shell using the following code:
def execute_in_shell!(commands, shell="bash")
channel = session.open_channel do |ch|
ch.exec("#{shell} -l") do |ch2, success|
# Set the terminal type
ch2.send_data "export TERM=vt100\n"
# Output each command as if they were entered on the command line
[commands].flatten.each do |command|
ch2.send_data "#{command}\n"
end
# Remember to exit or we'll hang!
ch2.send_data "exit\n"
# Configure to listen to ch2 data so you can grab stdout
end
end
# Wait for everything to complete
channel.wait
end
With this solution you still don't get exit status or stderr of commands run into the login shell, but at least the commands are executed in that context.
I hope this helps.
1 Comment
FilBot3
Good project, just a few years old, and there's a couple pull requests.
There is a nicer way to do this now. Instead you can use a shell subsystem with a pty to get everything you would expect from a shell login:
Net::SSH.start(@config.host, @config.user, :port => @config.port, :keys => @config.key, :config => true) do |session|
session.open_channel do |channel|
channel.request_pty
channel.send_channel_request "shell" do |ch, success|
if success
ch.send_data "env\n"
ch.send_data "#{command}\n"
ch.on_data do |c, data|
puts data
end
end
channel.send_data "exit\n"
channel.on_close do
puts "shell closed"
end
end
end
end
end
Comments
open_channel? It's hard to tell.