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| ## Knife plugin to generate an OpenSSH config file from a Chef search
# From Harvest. www.getharvest.com
# Modified for EC2 usage by Scott Likens
#
# Source: https://github.com/harvesthq/knife-plugins
#
# See http://wiki.opscode.com/display/chef/Knife+Plugins
# See http://www.openbsd.org/cgi-bin/man.cgi?query=ssh_config&sektion=5
#
## Install
# Place in .chef/plugins/knife/sshgen.rb
#
## Usage
# $ knife sshgen -p to print a config stanza to the screen
# $ knife sshgen -w to append to your current ~/.ssh/config file
#
## Suggestion
# use with bash-completion, by installing bash-completion and adding this to ~/.bash_profile:
# complete -W "$(echo `cat ~/.ssh/config | grep Hostname | uniq | awk '{print $2}'`;)" ssh
#
## Credit
# Hints taken from: https://github.com/danielsdeleo/knife-plugins/blob/master/deploy.rb
# Hints taken from: https://github.com/javan/whenever
module MakeSSHConfigFile
class Sshgen < Chef::Knife
banner "knife sshgen -w OR -p"
option :ssh_config_file,
:long => "--config-file",
:short => "-c",
:description => "The name of your SSH config file",
:default => "#{ENV['HOME']}/.ssh/config"
option :print,
:long => "--print",
:short => "-p",
:description => "Print the ssh config entry here in this screen",
:default => true
option :write,
:long => "--write",
:short => "-w",
:description => "Write (append) the config to local SSH config file",
:default => false
deps do
require 'chef/search/query'
require 'chef/knife/ssh'
end
def run
unless config[:print] || config[:write]
ui.error "You must specify either --print or --write."
exit 1
end
nodes = find_all_nodes
ssh_config = build_ssh_config(nodes)
if config[:write]
unless File.exists? config[:ssh_config_file]
ui.msg "WARNING: #{config[:ssh_config_file]} non-existent, but I'll try anyway"
end
new_ssh_config = read_ssh_config
if new_ssh_config.index(comment_open) && new_ssh_config.index(comment_close) #we have an existing config in between our markers, update it
final_ssh_config = new_ssh_config.gsub(Regexp.new("#{comment_open}.+#{comment_close}", Regexp::MULTILINE), "#{comment_open}\n#{ssh_config.chomp}\n#{comment_close}")
else # no existing markers, we'll append them
final_ssh_config = "#{new_ssh_config}\n#{comment_open}\n#{ssh_config}#{comment_close}"
end
write_ssh_config(final_ssh_config)
elsif config[:print]
ui.msg "#{ssh_config}"
end
end
def find_all_nodes
query = "name:*"
searcher = Chef::Search::Query.new
rows, _start, _total = searcher.search(:node, query)
if rows.empty?
ui.error "No nodes matched the query: #{query}"
exit 1
end
rows
end
def build_ssh_config(my_nodes)
ssh_config_block = ""
my_nodes.each do |n|
if n.has_key?("ec2")
ssh_config_block << "Host #{n.name} \n"
ssh_config_block << "\t Hostname #{n[:ec2][:public_hostname]} \n"
ssh_config_block << "\t User ubuntu \n"
else
ui.info "#{n} lacks an ec2 key"
end
end
ssh_config_block
end
def read_ssh_config
file = File.open(config[:ssh_config_file], "r+")
ssh_config_contents = ""
while(!file.eof?)
ssh_config_contents << file.readline
end
file.close()
ssh_config_contents
end
def write_ssh_config(contents)
begin
File.open(config[:ssh_config_file], 'w') {|f| f.write(contents) }
rescue
ui.error "ERROR: Writing #{config[:ssh_config_file]} failed."
else
ui.msg "Appended to: #{config[:ssh_config_file]}"
end
end
def comment_open
"###STARTSSHGEN"
end
def comment_close
"###ENDSSHGEN"
end
end
end
|