Net::SSH::Session
A wrapper on top of Net::SSH
and Net::SSH::Shell
to provide a set of tools for ssh sessions
Install
Install with rubygems:
gem install net-ssh-session
Install with bundler:
gem 'net-ssh-session', :github => 'sosedoff/net-ssh-session'
Usage
Basic usage:
require 'net/ssh/session'
# Initialize a new connection
session = Net::SSH::Session.new(host, user, password)
# Initialize connection on a different SSH port
session = Net::SSH::Session.new(host, user, password, :port => 5000)
# Connect to server
session.open
# If you want to set a connection timeout in seconds
# it will raise Timeout::Error
session.open(10)
# Execute a remote command
result = session.run("free -m")
# Net::SSH::SessionCommand helpers
result.success? # => true
result.failure? # => false
result.exit_code # => 0
result.output # => command output text
result.duration # => execution time, seconds
# Capture command output
session.capture('cat /etc/lsb-release')
# File helpers
session.file_exists?('/path')
session.directory_exists?('/path')
session.symlink_exists?('/path')
session.read_file('/path')
# Process helpers
session.process_exists?(PID)
session.kill_process(PID) # => true
session.kill_process(PID, 'SIGINT') # => false
session.last_exit_code # => 1
# Environment helpers
session.env('RAILS_ENV') # => production
session.export('RAILS_ENV', 'production')
session.export_hash(
'RAILS_ENV' => 'test',
'RACK_ENV' => 'test'
)
# Execute a batch of commands
session.run_multiple(
'git clone [email protected]:project.git',
'cd project',
'bundle install',
'rake test'
)
# Execute by calling a method
session.ping("-c 5", "google.com")
session.df('-h')
# Execute as sudo
session.sudo("whoami")
# Execute with time limit (10s)
begin
session.with_timeout(10) do
session.run('some long job')
end
rescue Timeout::Error
puts "Operation took too long :("
end
# Execute a long command and show ongoing process
session.run("rake test") do |str|
puts str
end
# Get history, returns an array with Net::SSH::SessionCommand objects
session.history.each do |cmd|
puts cmd.to_s # => I, [2012-11-08T00:10:48.229986 #51878] INFO -- : [bundle install --path .bundle] => 10, 35 bytes
if cmd.success?
# do your thing
end
end
# Close current session
session.close
Advanced Usage
Running multiple commands
By default multiple command execution will not break if one of the commands fails. If you want to break the chain on the first failure, supply :break => true
option:
session.run_multiple(commands, :break => true)
To get each command result after execution, you can supply a block:
commands = ["mkdir /tmp", "echo test > /tmp/file", "rm -rf /tmp"]
session.run_multiple(commands) do |cmd|
puts "Original command: #{cmd.command}"
puts "Exit code: #{cmd.exit_code}"
puts "Output: #{cmd.output}"
end
Using session logger
If you want to log command execution for the whole session you can assign a logger:
require 'logger'
require 'net/ssh/session'
s = Net::SSH::Session.new(host, user, password)
s.logger = Logger.new(STDOUT)
s.open
s.run("cd /tmp")
s.run("git clone git://github.com/sosedoff/net-ssh-session.git")
s.run("bundle install --path .bundle")
s.close
Since the logger is set to write to STDOUT
you'll see something like this:
I, [2012-11-08T00:10:47.605916 #51878] INFO -- : [cd /tmp] => 0, 0 bytes
I, [2012-11-08T00:10:48.038294 #51878] INFO -- : [git clone git://github.com/sosedoff/net-ssh-session.git] => 0, 7795 bytes
I, [2012-11-08T00:10:48.229986 #51878] INFO -- : [bundle install --path .bundle] => 10, 35 bytes
Execution history
By default each session command (Net::SSH::SessionCommand
) will be recorded in
session history. Example how to skip history tracking:
require 'net/ssh/session'
s = Net::SSH::Session.new(host, user, password)
s.open
# Run commands with no history
s.run("export RAILS_ENV=test", :history => false)
r.run("mysqlcheck --repair mysql proc -u root", :history => false)
# Rest will be recorded
s.run("git clone git://github.com/sosedoff/net-ssh-session.git")
s.run("bundler install --path .")
s.close
You can also disable history for the whole session:
Net::SSH::Session.new(host, user, password, :history => false)
Execute any command with timeout
To enable session-wide command execution timeout, pass an extra option:
session = Net::SSH::Session.new(host, user, password, :timeout => 10)
This will limit any command execution time to 10 seconds. Error Timeout::Error
will be raised when timeout is exceeded.
License
The MIT License (MIT)
Copyright (c) 2012-2014 Dan Sosedoff, [email protected]