From: Matthew Mucklo <redmine@...>
Date: 2009-01-23T05:30:47+09:00
Subject: [ruby-core:21529] [Bug #1041] Net:SSH problem with open_channel

Bug #1041: Net:SSH problem with open_channel
http://redmine.ruby-lang.org/issues/show/1041

Author: Matthew Mucklo
Status: Open, Priority: Normal

It appears that the open_channel method does not always work when used without passing it a block.

Steps to reproduce:

require 'net/ssh'
ssh = Net::SSH.start('system', 'user', :password => 'password')
ch = ssh.open_channel
ch.exec 'ls' do |ch, success|
end

Resultant error:

TypeError: can't convert nil into Integer
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:294:in `pack'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:294:in `write_long'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:55:in `send'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:55:in `from'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:47:in `step'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/buffer.rb:47:in `from'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/connection/channel.rb:465:in `send_channel_request'
        from /usr/lib/ruby/site_ruby/1.8/net/ssh/connection/channel.rb:159:in `exec'
        from (irb):9

The same does work if open_channel is passed a block, however, like such:

require 'net/ssh'
ssh = Net::SSH.start('system', 'user', :password => 'password')
channel = ssh.open_channel do |ch|
  ch.exec 'ls' do |ch, success|
  end
end

Also it will work if you run ssh.exec! before running ch.exec:

require 'net/ssh'
ssh = Net::SSH.start('system', 'user', :password => 'password')
ch = ssh.open_channel
ssh.exec! 'ls'
ch.exec 'ls' do |ch, success|
end

----------------
$ ruby -v
ruby 1.8.7 (2008-06-20 patchlevel 22) [ia64-hpux11.23]
$ uname -a
HP-UX srvr B.11.23 U ia64 4026996514 unlimited-user license

# srvr is the name of the server

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