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#!/opt/puppetlabs/puppet/bin/ruby
# encoding: UTF-8
require 'json'
require 'yaml'
require 'puppet'
module Pxp
class ModulePuppet
module Errors
InvalidJson = "invalid_json"
NoPuppetBin = "no_puppet_bin"
NoLastRunReport = "no_last_run_report"
InvalidLastRunReport = "invalid_last_run_report"
Disabled = "agent_disabled"
Locked = "agent_locked"
FailedToStart = "agent_failed_to_start"
NonZeroExit = "agent_exit_non_zero"
end
class ProcessingError < StandardError
attr_reader :error_type
def initialize(error_type, message = nil)
super(message)
@error_type = error_type
end
end
attr_reader :config, :flags
def self.handle_action(action)
if action == 'metadata'
puts metadata.to_json
else
result = create_runner($stdin.read.chomp)
if result.is_a?(self)
action_results = result.run
else
action_results = result
end
print action_results.to_json
unless action_results["error"].nil?
exit 1
end
end
end
DEFAULT_EXITCODE = -1
def get_env_fix_up
# If running in a C or POSIX locale, ask Puppet to use UTF-8
base_env = {}
if Encoding.default_external == Encoding::US_ASCII
base_env = {"RUBYOPT" => "#{ENV['RUBYOPT']} -EUTF-8"}
end
# Prepare an environment fix-up to make up for its cleansing performed
# by the Puppet::Util::Execution.execute function.
# This fix-up is meant for running puppet under a non-root user;
# puppet cannot find the user's HOME directory otherwise.
@env_fix_up ||= if Puppet.features.microsoft_windows? || Process.euid == 0
# no environment fix-up is needed on windows or for root
base_env
else
begin
require 'etc'
pwentry = Etc.getpwuid(Process.euid)
{"USER" => pwentry.name,
"LOGNAME" => pwentry.name,
"HOME" => pwentry.dir}.merge base_env
rescue => e
# oh well ..., let's give it a try without the environment fix-up
myname = File.basename($0)
$stderr.puts "#{myname}: Could not fix environment for effective UID #{Process.euid}: #{e.message}"
$stderr.puts "#{myname}: Expect puppet run problems"
base_env
end
end
end
def self.last_run_result(exitcode)
return {"time" => "unknown",
"transaction_uuid" => "unknown",
"environment" => "unknown",
"status" => "unknown",
"metrics" => {},
"exitcode" => exitcode,
"version" => 1}
end
def force_unicode(s)
begin
# Later comparisons assume UTF-8. Convert to that encoding now.
s.encode(Encoding::UTF_8)
rescue Encoding::InvalidByteSequenceError, Encoding::UndefinedConversionError
# Found non-native characters, hope it's a UTF-8 string. Since this is Puppet, and
# incorrect characters probably means we're in a C or POSIX locale, this is usually safe.
s.force_encoding(Encoding::UTF_8)
end
end
def config_print(*keys)
command_array = [config["puppet_bin"], "agent", "--configprint", keys.join(',')]
process_output = Puppet::Util::Execution.execute(command_array,
{:custom_environment => get_env_fix_up(),
:override_locale => false})
result = force_unicode(process_output.to_s)
if keys.count == 1
result.chomp
else
result.lines.inject({}) do |conf, line|
key, value = line.chomp.split(' = ', 2)
if key && value
conf[key] = value
end
conf
end
end
end
def running?(lockfile)
return File.exist?(lockfile)
end
def disabled?(lockfile)
return File.exist?(lockfile)
end
def make_environment_hash()
# NB: we're ignoring the `env` array for setting the environment
return get_env_fix_up()
end
def puppet_agent_command
cmd_array = [config["puppet_bin"], "agent"]
cmd_array += flags
return cmd_array
end
def self.make_error_result(exitcode, error_type, error_message)
result = last_run_result(exitcode)
result["error_type"] = error_type
result["error"] = error_message
return result
end
def make_error_result(exitcode, error_type, error_message)
self.class.make_error_result(exitcode, error_type, error_message)
end
def parse_report(filename)
# Read the report and drop Ruby objects first. We can't parse the Ruby objects
# (because we don't have Puppet loaded) and don't need that data.
# Psych::Nodes::Node#each iterates over each node in the parsed document tree.
# YAML.parse_file returns a Psych::Nodes::Document, and #root returns the
# root-level Node.
data = YAML.parse_file(filename)
data.root.each do |o|
o.tag = nil if o.respond_to?(:tag=)
end
data.to_ruby
end
def nest_metrics(metrics)
metrics.fetch('resources', {}).fetch('values', {}).inject({}) do |result, (name,human_name,value)|
result.merge(name => value)
end
end
def get_result_from_report(last_run_report, exitcode, start_time)
if !File.exist?(last_run_report)
return make_error_result(exitcode, Errors::NoLastRunReport,
"#{last_run_report} doesn't exist")
end
if start_time && File.mtime(last_run_report) == start_time
return make_error_result(exitcode, Errors::NoLastRunReport,
"The Puppet run failed in an unexpected way")
end
last_run_report_yaml = {}
begin
last_run_report_yaml = parse_report(last_run_report)
rescue => e
return make_error_result(exitcode, Errors::InvalidLastRunReport,
"#{last_run_report} could not be loaded: #{e}")
end
if exitcode == 0
run_result = self.class.last_run_result(exitcode)
else
run_result = make_error_result(exitcode, Errors::NonZeroExit,
"Puppet agent exited with a non 0 exitcode")
end
run_result["time"] = last_run_report_yaml['time']
run_result["transaction_uuid"] = last_run_report_yaml['transaction_uuid']
run_result["environment"] = last_run_report_yaml['environment']
run_result["status"] = last_run_report_yaml['status']
run_result["metrics"] = nest_metrics(last_run_report_yaml['metrics'])
return run_result
end
# Wait for the lockfile to be removed. If it hasn't after 10 minutes, give up.
def wait_for_lockfile(lockfile, check_interval = 0.1, give_up_after = 10*60)
number_of_tries = give_up_after / check_interval
count = 0
while File.exist?(lockfile) && count < number_of_tries
sleep check_interval
count += 1
end
end
# Determine whether the configured puppet bin exists. This method mostly
# exists for testing.
def puppet_bin_present?
File.exist?(config["puppet_bin"])
end
def get_start_time(last_run_report)
File.mtime(last_run_report) if File.exist?(last_run_report)
end
def try_run(last_run_report)
start_time = get_start_time(last_run_report)
run_result = Puppet::Util::Execution.execute(puppet_agent_command, {:failonfail => false,
:custom_environment => make_environment_hash(),
:override_locale => false})
return start_time, (run_result ? run_result.exitstatus : nil)
end
def run
if !puppet_bin_present?
return make_error_result(DEFAULT_EXITCODE, Errors::NoPuppetBin,
"Puppet executable '#{config["puppet_bin"]}' does not exist")
end
puppet_config = config_print('lastrunreport', 'agent_disabled_lockfile', 'agent_catalog_run_lockfile')
last_run_report = puppet_config['lastrunreport']
if last_run_report.nil? || last_run_report.empty?
return make_error_result(DEFAULT_EXITCODE, Errors::NoLastRunReport,
"could not find the location of the last run report")
end
# Initially ignore the lockfile. It might be out-dated, so we give Puppet a chance
# to clean it up and run.
start_time, exitcode = try_run(last_run_report)
if exitcode.nil?
return make_error_result(DEFAULT_EXITCODE, Errors::FailedToStart,
"Failed to start Puppet agent")
end
# If the run was successful, don't check for failure modes.
if exitcode != 0
if disabled?(puppet_config['agent_disabled_lockfile'] || '')
return make_error_result(exitcode, Errors::Disabled,
"Puppet agent is disabled")
end
# Check for a lockfile. If present, wait until it's removed and try running again.
# There's a chance that our run finished with a real error rather than because Puppet was
# already running, but another run started immediately after. Since we have no
# language-agnostic way to tell, we accept that we might run twice in that case.
# The run could also finish immediately after we tried, and the lockfile be absent.
# In that case we'll fail with poor error reporting.
lockfile = puppet_config['agent_catalog_run_lockfile'] || ''
if running?(lockfile)
wait_for_lockfile(lockfile)
start_time, exitcode = try_run(last_run_report)
if exitcode.nil?
return make_error_result(DEFAULT_EXITCODE, Errors::FailedToStart,
"Failed to start Puppet agent")
end
if exitcode != 0
if disabled?(puppet_config['agent_disabled_lockfile'] || '')
return make_error_result(exitcode, Errors::Disabled,
"Puppet agent is disabled")
end
if running?(lockfile)
return make_error_result(exitcode, Errors::Locked,
"Puppet agent run is already in progress")
end
end
end
end
return get_result_from_report(last_run_report, exitcode, start_time)
end
# TODO(ale): remove `env` from input before bumping to the next version
def self.metadata()
return {
:description => "PXP Puppet module",
:actions => [
{ :name => "run",
:description => "Start a Puppet run",
:input => {
:type => "object",
:properties => {
:env => {
:type => "array",
},
:flags => {
:type => "array",
:items => {
:type => "string"
}
},
:job => {
:type => "string"
}
},
:required => [:flags]
},
:results => {
:type => "object",
:properties => {
:time => {
:type => "string"
},
:transaction_uuid => {
:type => "string"
},
:metrics => {
:type => "object"
},
:environment => {
:type => "string"
},
:status => {
:type => "string"
},
:error_type => {
:type => "string"
},
:error => {
:type => "string"
},
:exitcode => {
:type => "number"
},
:version => {
:type => "number"
}
},
:required => [:time, :transaction_uuid, :environment, :status,
:exitcode, :version]
}
}
],
:configuration => {
:type => "object",
:properties => {
:puppet_bin => {
:type => "string"
}
}
}
}
end
def self.add_config_defaults(config)
config = config.dup
if config["puppet_bin"].nil? || config["puppet_bin"].empty?
if !Puppet.features.microsoft_windows?
config["puppet_bin"] = "/opt/puppetlabs/bin/puppet"
else
module_path = File.expand_path(File.dirname(__FILE__))
puppet_bin = File.join(module_path, '..', '..', 'bin', 'puppet.bat')
config["puppet_bin"] = File.expand_path(puppet_bin)
end
end
config
end
DEFAULT_FLAGS = ["--onetime", "--no-daemonize", "--verbose"]
DEFAULT_FLAGS_NAMES = ["onetime", "daemonize", "verbose"]
WHITELISTED_FLAGS_NAMES = [
"color", "configtimeout",
"debug","disable_warnings",
"environment", "evaltrace",
"filetimeout",
"graph",
"http_connect_timeout", "http_debug", "http_keepalive_timeout", "http_read_timeout",
"log_level",
"noop",
"ordering",
"pluginsync",
"show_diff", "skip_tags", "splay", "strict_environment_mode",
"tags", "trace",
"use_cached_catalog", "usecacheonfailure",
"waitforcert"]
# All flags and valid arguments to them should be caught by this.
# It was constructed for the following argument types:
# "timeout": /\A\d+[mhdy]?\Z/,
# "environment": /\A[a-z0-9_]+\Z/,
# "tag": /\A[a-z0-9_][a-z0-9_:\.\-]*\Z/,
# "ordering": /\Atitle-hash|manifest|random\Z/
VALID_FLAG_REGEX = /\A[a-zA-Z0-9_:,\.\-]+\Z/
# This asserts that the flag has a valid prefix
def self.get_flag_name(flag)
if flag.start_with?("--no-")
flag[5..-1]
elsif flag.start_with?("--")
flag[2..-1]
else
raise "Assertion error: we're here by mistake"
end
end
def self.process_flags(action_input)
flags = action_input['flags'] || []
flags.each do |flag|
flag = flag.strip
unless flag =~ VALID_FLAG_REGEX
raise ProcessingError.new(Errors::InvalidJson, "The json received on STDIN contained characters not present in valid flags: #{flag}")
end
if flag.start_with?("--")
flag_name = get_flag_name(flag)
if DEFAULT_FLAGS_NAMES.include?(flag_name)
unless DEFAULT_FLAGS.include?(flag)
raise ProcessingError.new(Errors::InvalidJson, "The json received on STDIN overrides a default setting with: #{flag}")
end
next
end
unless WHITELISTED_FLAGS_NAMES.include?(flag_name)
raise ProcessingError.new(Errors::InvalidJson, "The json received on STDIN included a non-permitted flag: #{flag}")
end
end
end
flags |= DEFAULT_FLAGS
if action_input.has_key?("job")
flags += ["--job-id", action_input["job"]]
end
flags
end
def self.create_runner(input)
begin
args = JSON.parse(input)
rescue
return make_error_result(DEFAULT_EXITCODE, Errors::InvalidJson,
"Invalid json received on STDIN: #{input}")
end
unless args.is_a?(Hash)
return make_error_result(DEFAULT_EXITCODE, Errors::InvalidJson,
"The json received on STDIN was not a hash: #{args.to_s}")
end
output_files = args["output_files"]
if output_files
begin
$stdout.reopen(File.open(output_files["stdout"], 'w', 0640))
$stderr.reopen(File.open(output_files["stderr"], 'w', 0640))
rescue => e
print make_error_result(DEFAULT_EXITCODE, Errors::InvalidJson,
"Could not open output files: #{e.message}").to_json
exit 5 # this exit code is reserved for problems with opening
# of the output_files
end
at_exit do
status = if $!.nil?
0
elsif $!.is_a?(SystemExit)
$!.status
else
1
end
# flush the stdout/stderr before writing the exitcode
# file to avoid pxp-agent reading incomplete output
$stdout.fsync
$stderr.fsync
begin
File.open(output_files["exitcode"], 'w', 0640) do |f|
f.puts(status)
end
rescue => e
print make_error_result(DEFAULT_EXITCODE, Errors::InvalidJson,
"Could not open exit code file: #{e.message}").to_json
exit 5 # this exit code is reserved for problems with opening
# of the output_files
end
end
end
begin
config = add_config_defaults(args["configuration"] || {})
action_input = args["input"]
unless action_input.is_a?(Hash)
raise ProcessingError.new(Errors::InvalidJson, "The json received on STDIN did not contain a valid 'input' key: #{args.to_s}")
end
flags = process_flags(action_input)
new(config, flags)
rescue ProcessingError => e
return make_error_result(DEFAULT_EXITCODE, e.error_type, e.message)
end
end
def initialize(config, flags)
@config = config
@flags = flags
end
end
end
if __FILE__ == $0
action = ARGV.shift || 'metadata'
Pxp::ModulePuppet.handle_action(action)
end
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