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#!/usr/bin/ruby
#
# This is a wrapper script around the puppet command used by the LEAP platform.
#
# We do this in order to make it faster and easier to control puppet remotely
# (exit codes, lockfile, multiple manifests, etc)
#
require 'pty'
require 'yaml'
PUPPET_BIN = '/usr/bin/puppet'
PUPPET_DIRECTORY = '/srv/leap'
PUPPET_PARAMETERS = '--color=false --detailed-exitcodes --libdir=puppet/lib --confdir=puppet'
SITE_MANIFEST = 'puppet/manifests/site.pp'
DEFAULT_TAGS = 'leap_base,leap_service'
HIERA_FILE = '/etc/leap/hiera.yaml'
def main
process_command_line_arguments
with_lockfile do
@commands.each do |command|
self.send(command)
end
end
end
def puts(str)
$stdout.puts str
$stdout.flush
end
def process_command_line_arguments
@commands = []
@verbosity = 1
@tags = DEFAULT_TAGS
loop do
case ARGV[0]
when 'apply' then ARGV.shift; @commands << 'apply'
when 'set_hostname' then ARGV.shift; @commands << 'set_hostname'
when '--verbosity' then ARGV.shift; @verbosity = ARGV.shift.to_i
when '--force' then ARGV.shift; remove_lockfile
when '--tags' then ARGV.shift; @tags = ARGV.shift
when /^-/ then usage("Unknown option: #{ARGV[0].inspect}")
else break
end
end
usage("No command given") unless @commands.any?
end
def apply
exit_code = puppet_apply do |line|
puts line
end
puts "Puppet apply complete (#{exitcode_description(exit_code)})."
end
def set_hostname
unless File.exists?(HIERA_FILE)
puts("ERROR: Cannot set hostname without #{HIERA_FILE}")
exit(1)
end
hostname = YAML.load_file(HIERA_FILE)['name']
if hostname.nil? || hostname.empty?
puts('ERROR: NAME argument required')
exit(1)
end
current_hostname_file = File.read('/etc/hostname') rescue nil
current_hostname = `/bin/hostname`.strip
# set /etc/hostname
if current_hostname_file != hostname
File.open('/etc/hostname', 'w', 0611, :encoding => 'ascii') do |f|
f.write hostname
end
if File.read('/etc/hostname') == hostname
puts "Set /etc/hostname to #{hostname}"
else
puts "ERROR: failed to update /etc/hostname"
end
end
# call /bin/hostname
if current_hostname != hostname
if run("/bin/hostname #{hostname}") == 0
puts "Set hostname to #{hostname}"
else
puts "ERROR: failed to call `/bin/hostname #{hostname}`"
end
end
end
#
# each line of output is yielded. the exit code is returned.
#
def puppet_apply(options={}, &block)
options = {:verbosity => @verbosity, :tags => @tags}.merge(options)
manifest = options[:manifest] || SITE_MANIFEST
Dir.chdir(PUPPET_DIRECTORY) do
return run("#{PUPPET_BIN} apply #{custom_parameters(options)} #{PUPPET_PARAMETERS} #{manifest}", &block)
end
end
def custom_parameters(options)
params = []
if options[:tags] && options[:tags].chars.any?
params << "--tags #{options[:tags]}"
end
if options[:verbosity]
case options[:verbosity]
when 3 then params << '--verbose'
when 4 then params << '--verbose --debug'
when 5 then params << '--verbose --debug --trace'
end
end
params.join(' ')
end
def exitcode_description(code)
case code
when 0 then "no changes"
when 1 then "failed"
when 2 then "changes made"
when 4 then "failed"
when 6 then "changes and failures"
else code
end
end
def usage(s)
$stderr.puts(s)
$stderr.puts
$stderr.puts("Usage: #{File.basename($0)} COMMAND [OPTIONS]")
$stderr.puts
$stderr.puts("COMMAND may be one or more of:
set_hostname -- set the hostname of this server
apply -- apply puppet manifests")
$stderr.puts
$stderr.puts("OPTIONS may be one or more of:
--verbosity VERB -- set the verbosity level 0..5
--tags TAGS -- set the tags to pass through to puppet
--force -- run even when lockfile is present")
exit(2)
end
##
## Simple lock file
##
require 'fileutils'
DEFAULT_LOCKFILE = '/tmp/puppet.lock'
def remove_lockfile(lock_file_path=DEFAULT_LOCKFILE)
FileUtils.remove_file(lock_file_path, true)
end
def with_lockfile(lock_file_path=DEFAULT_LOCKFILE)
begin
File.open(lock_file_path, File::CREAT | File::EXCL | File::WRONLY) do |o|
o.write(Process.pid)
end
yield
remove_lockfile
rescue Errno::EEXIST
puts("ERROR: the lock file '#{lock_file_path}' already exists. Wait a minute for the process to die, or run with --force to ignore. Bailing out.")
exit(1)
rescue IOError => exc
puts("ERROR: problem with lock file '#{lock_file_path}' (#{exc}). Bailing out.")
exit(1)
end
end
##
## simple pass through process runner (to ensure output is not buffered and return exit code)
## this only works under ruby 1.9
##
def run(cmd)
puts cmd if @verbosity >= 3
PTY.spawn("#{cmd}") do |output, input, pid|
begin
while line = output.gets do
yield line
end
rescue Errno::EIO
end
Process.wait(pid) # only works in ruby 1.9, required to capture the exit status.
end
return $?.exitstatus
rescue PTY::ChildExited
end
##
## RUN MAIN
##
Signal.trap("EXIT") do
remove_lockfile # clean up the lockfile when process is terminated.
# this will remove the lockfile if ^C killed the process
# but only after the child puppet process is also dead (I think).
end
main()
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