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#
# A custome SSHKit backend, derived from the default netssh backend.
# Our custom backend modifies the logging behavior and gracefully captures
# common exceptions.
#
require 'stringio'
require 'timeout'
require 'sshkit'
require 'leap_cli/ssh/formatter'
require 'leap_cli/ssh/scripts'
module SSHKit
class Command
#
# override exit_status in order to be less verbose
#
def exit_status=(new_exit_status)
@finished_at = Time.now
@exit_status = new_exit_status
if options[:raise_on_non_zero_exit] && exit_status > 0
message = ""
message += "exit status: " + exit_status.to_s + "\n"
message += "stdout: " + (full_stdout.strip.empty? ? "Nothing written" : full_stdout.strip) + "\n"
message += "stderr: " + (full_stderr.strip.empty? ? 'Nothing written' : full_stderr.strip) + "\n"
raise Failed, message
end
end
end
end
module LeapCli
module SSH
class Backend < SSHKit::Backend::Netssh
# since the @pool is a class instance variable, we need to copy
# the code from the superclass that initializes it. boo
@pool = SSHKit::Backend::ConnectionPool.new
# modify to pass itself to the block, instead of relying on instance_exec.
def run
Thread.current["sshkit_backend"] = self
# was: instance_exec(@host, &@block)
@block.call(self, @host)
ensure
Thread.current["sshkit_backend"] = nil
end
# if set, all the commands will begin with:
# sudo -u #{@user} -- sh -c '<command>'
def set_user(user='root')
@user = user
end
#
# like default capture, but gracefully logs failures for us
# last argument can be an options hash.
#
# available options:
#
# :fail_msg - [nil] if set, log this instead of the default
# fail message.
#
# :raise_error - [nil] if true, then reraise failed command exception.
#
# :log_cmd - [false] if true, log what the command is that gets run.
#
# :log_output - [true] if true, log each output from the command as
# it is received.
#
# :log_finish - [false] if true, log the exit status and time
# to completion
#
# :log_wrap - [nil] passed to log method as :wrap option.
#
def capture(*args)
extract_options(args)
initialize_logger(:log_output => false)
rescue_ssh_errors(*args) do
return super(*args)
end
end
#
# like default execute, but log the results as they come in.
#
# see capture() for available options
#
def stream(*args)
extract_options(args)
initialize_logger
rescue_ssh_errors(*args) do
execute(*args)
end
end
def log(*args, &block)
@logger ||= LeapCli.new_logger
@logger.log(*args, &block)
end
# some prewritten servers-side scripts
def scripts
@scripts ||= LeapCli::SSH::Scripts.new(self, @host.hostname)
end
#
# sshkit just passes upload! and download! to Net::SCP, but Net::SCP
# make it impossible to set the file permissions. Here is how the mode
# is determined, from upload.rb:
#
# mode = channel[:stat] ? channel[:stat].mode & 07777 : channel[:options][:mode]
#
# The stat info from the file always overrides the mode you pass in options.
# However, the channel[:options][:mode] will be applied for pure in-memory
# uploads. So, if the mode is set, we convert the upload to be a memory
# upload instead of a file upload.
#
# Stupid, but blame Net::SCP.
#
def upload!(src, dest, options={})
if options[:mode]
super(StringIO.new(File.read(src)), dest, options)
else
super(src, dest, options)
end
end
private
#
# creates a new logger instance for this specific ssh command.
# by doing this, each ssh session has its own logger and its own
# indentation.
#
# potentially modifies 'args' array argument.
#
def initialize_logger(default_options={})
@logger ||= LeapCli.new_logger
@output = LeapCli::SSH::Formatter.new(@logger, @host, default_options.merge(@options))
end
def extract_options(args)
if args.last.is_a? Hash
@options = args.pop
else
@options = {}
end
end
#
# capture common exceptions
#
def rescue_ssh_errors(*args, &block)
yield
rescue Net::SSH::HostKeyMismatch => exc
@logger.log(:fatal_error, "Host key mismatch!") do
@logger.log(exc.to_s)
@logger.log("The ssh host key for the server does not match what is on "+
" file in `%s`." % Path.named_path(:known_hosts))
@logger.log("One of these is happening:") do
@logger.log("There is an active Man in The Middle attack against you.")
@logger.log("Or, someone has generated new host keys for the server " +
"and your provider files are out of date.")
@logger.log("Or, a new server is using this IP address " +
"and your provider files are out of date.")
@logger.log("Or, the server configuration has changed to use a different host key.")
end
@logger.log("You can pin a different host key using `leap node init NODE`, " +
"but you must verify the fingerprint of the new host key!")
end
exit(1)
rescue StandardError => exc
if exc.is_a?(SSHKit::Command::Failed) || exc.is_a?(SSHKit::Runner::ExecuteError)
if @options[:raise_error]
raise LeapCli::SSH::ExecuteError, exc.to_s
elsif @options[:fail_msg]
@logger.log(@options[:fail_msg], host: @host.hostname, :color => :red)
else
@logger.log(:failed, args.join(' '), host: @host.hostname) do
@logger.log(exc.to_s.strip, wrap: true)
end
end
elsif exc.is_a?(Timeout::Error) || exc.is_a?(Net::SSH::ConnectionTimeout)
@logger.log(:failed, args.join(' '), host: @host.hostname) do
@logger.log("Connection timed out")
end
if @options[:raise_error]
raise LeapCli::SSH::TimeoutError, exc.to_s
end
else
raise
end
return nil
end
def output
@output ||= LeapCli::SSH::Formatter.new(@logger, @host)
end
end
end
end
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