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rb83/net-ssh-cli: A library to make interactive SSH sessions more convenient. · GitHub

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Net::SSH::CLI

Adds another layer on top of Net::SSH for a proper handling of CLI sessions which last longer than one command. This is especially usefull for enterprise Switches and Routers.

Installation

Add this line to your application's Gemfile:

gem 'net-ssh-cli'

And then execute:

$ bundle

Or install it yourself as:

$ gem install net-ssh-cli

Features

  • provides an abstraction on top of the text-stream of a long living CLI sessions
  • tries to be highly configurable
  • has methods like #cmd and #dialog for common usecases
  • offers waiting operations like #read_till

Usage

Net::SSH.start('host', 'user', password: "password") do |ssh|
  cli = ssh.cli(default_prompt: /(\nuser@host):/m)
  cli.cmd ""
  # => "Last login: \nuser@host:"

  cli.cmd "echo 'bananas'"
  # => "echo 'bananas'\nbananas\nuser@host:"
end
  net_ssh = Net::SSH.start('host', 'user', password: "password")
  cli = Net::SSH::CLI::Session.new(net_ssh: net_ssh)
  cli.cmd ""
  cli = Net::SSH::CLI::Session.new(net_ssh_options: {host: 'host', user: 'user', password: 'password'})
  cli.cmd ""

#cmd

  cli = ssh.cli(default_prompt: /(\nuser@host):/m)
  cli.cmd "echo 'bananas'"
  # => "echo 'bananas'\nbananas\nuser@host:"
  cli.cmd "echo 'bananas'", rm_command: true
  # => "bananas\nuser@host:"
  cli.cmd "echo 'bananas'", rm_prompt: true
  # => "echo 'bananas'\nbananas"
  cli.cmd "echo 'bananas'", rm_command: true, rm_prompt: true
  # => "bananas"

Remove the command and the prompt for #cmd & #dialog by default

  cli = ssh.cli(default_prompt: /(\nuser@host):/m, cmd_rm_command: true, cmd_rm_prompt: true)
  cli.cmd "echo 'bananas'"
  # => "bananas"

#cmds

It's the same as #cmd but for multiple commands.

  cli.cmds ["echo 'bananas'", "echo 'apples'"], rm_command: true, rm_prompt: true
  # => ["bananas", "apples"]

#dialog

Use this method to specify a differnt 'prompt' for once. This is perfect for interactive commands.

  cli.dialog "echo 'are you sure?' && read -p 'yes|no>'", /\nyes|no>/
  # => "echo 'are you sure?' && read -p 'yes|no>'\nyes|no>"
  cli.cmd "yes"
cli.dialog "passwd", /Current Password:/i
cli.dialog "Old Password", /New Password:/i
cli.dialog "New Password", /Repeat Password:/i
cli.cmd "New Password"

#impact

The very same as #cmd but it respects a flag whether to run commands with 'impact'. This can be used in a setup where you don't want to run certain commands under certain conditions. For example in testing.

  cli.run_impact?
  # => false
  cli.impact "reboot now"
  # => "skip: 'reboot now'"
  cli.run_impact = true
  cli.impact "reboot now"
  # => connection closed

#read & #write

  cli.write "echo 'hello'\n"
  # => "echo 'hello'\n"
  cli.read
  # => "echo 'hello'\nhello\nuser@host:"

#write_n

  cli.write_n "echo 'hello'"
  # => "echo 'hello'\n"

#read_till

keep on processing till the stdout matches to given|default prompt and then read the whole stdin.

  cli.write "echo 'hello'\n"
  # => "echo 'hello'\n"
  cli.read_till
  # => "echo 'hello'\nhello\nuser@host:"

This method is used by #cmd, see lib/net/ssh/cli.rb#cmd

#read_for

  cli.write_n "sleep 180"
  # => ""
  cli.read_for(seconds: 181)
  # => "..."

Configuration

Have a deep look at the various Options configured by Net::SSH::CLI::OPTIONS in lib/net/ssh/cli.rb Nearly everything can be configured.

Callbacks

The following callbacks are available

  • before_open_channel
  • after_open_channel
  • before_on_stdout
  • after_on_stdout
cli.before_open_channel do
  puts "The channel will open soon"
end
cli.after_open_channel do
  cmd "logger 'Net::SSH::CLI works'"
  cmd "sudo -i"
end

Using the callbacks you can define a debugger which shows the stdout buffer content each time new data is received.

cli.after_on_stdout do
  warn stdout
end
cli.after_on_stdout do
  stdout.gsub!("\r\n", "\n")
end

#hostname #host #to_s

  cli.to_s
  # => "localhost"
  cli.hostname
  # => "localhost"
  cli.host
  # => "localhost"

#detect_prompt

NET::SSH::CLI can try to guess the prompt by waiting for it and using the last line. This works usually, but is not guaranteed to work well.

  cli.open_channel
  # => ...
  cli.detect_prompt(seconds: 3)
  # => "[my prompt]"

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/swisscom/net-ssh-cli.

License

The gem is available as open source under the terms of the MIT License.

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A library to make interactive SSH sessions more convenient.

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