#!/usr/bin/env ruby -KU
require 'rubygems'
require 'vlad'

# I use multiple ssh keys to manage multiple servers
# I do this using ssh's -i option to point to the
# identity (private key) I want to use for authentication
# It seems, for some reason, Vlad's run command mangles
# the path arg to ssh -i <path>

# setup for system call and key gen
pwd = Dir.pwd
domain = "localhost"
key = "#{pwd}/tmp_dir/tmp_key"
# We want the SSH call to fail fast so we send it to port 42
ssh_flags = ["-i #{key}", "-p 42"]

# setup vlad the same way as system
set :domain, domain
set :ssh_flags, ssh_flags

# Generate a new SSH key pair in a directory which is chmod 700 (req'd by ssh)
system "mkdir -p #{pwd}/tmp_dir;chmod 700 #{pwd}/tmp_dir"
system "ssh-keygen -P \"\" -t dsa -f #{key}"

# setup vlad's remote_task
remote_task :ssh_err, :roles => :app do
  begin
    run "echo a"
  rescue Vlad::CommandFailedError => e
    # I know it will fail (unless you're running ssh on port 42)
    # The interesting thing is in the return from run
  end
end

puts "Just to be sure, File.exists?: #{File.exists? key}\n\n"

puts 'COMMENT: Here no warnings, ssh finds the key fine'
system "ssh #{ssh_flags.join' '} #{domain}"

puts "\n"

puts "COMMENT: Why the warning? We're using the same absolute path."
Rake::Task['ssh_err'].invoke

# _________________ OUTPUT ______________
# ...
# Just to be sure, File.exists?: true
#
# COMMENT: Here no warnings, ssh finds the key fine
# ssh: connect to host localhost port 42: Connection refused
#
# COMMENT: Why the warning? We're using the same absolute path.
# Warning: Identity file  /Users/nihildeb/tmp_dir/tmp_key not accessible: No such file or directory.
# ssh: connect to host localhost port 42: Connection refused