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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Copyright:: Copyright (c) 2008 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'chef/log'
require 'chef/exceptions'
require 'tmpdir'
require 'fcntl'
require 'etc'
class Chef
module Mixin
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# NOTE:
# The popen4 method upon which all the code here is based has a race
# condition where it may fail to read all of the data written to stdout and
# stderr after the child process exits. The tests for the code here
# occasionally fail because of this race condition, so they have been
# tagged "volatile".
#
# This code is considered deprecated, so it should not need to be modified
# frequently, if at all. HOWEVER, if you do modify the code here, you must
# explicitly enable volatile tests:
#
# bundle exec rspec spec/unit/mixin/command_spec.rb -t volatile
#
# In addition, you should make a note that tests need to be run with
# volatile tests enabled on any pull request or bug report you submit with
# your patch.
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
module Command
extend self
# NOTE: run_command is deprecated in favor of using Chef::Shellout which now comes from the mixlib-shellout gem. NOTE #
if RUBY_PLATFORM =~ /mswin|mingw32|windows/
require 'chef/mixin/command/windows'
include ::Chef::Mixin::Command::Windows
extend ::Chef::Mixin::Command::Windows
else
require 'chef/mixin/command/unix'
include ::Chef::Mixin::Command::Unix
extend ::Chef::Mixin::Command::Unix
end
# === Parameters
# args<Hash>: A number of required and optional arguments
# command<String>, <Array>: A complete command with options to execute or a command and options as an Array
# creates<String>: The absolute path to a file that prevents the command from running if it exists
# cwd<String>: Working directory to execute command in, defaults to Dir.tmpdir
# timeout<String>: How many seconds to wait for the command to execute before timing out
# returns<String>: The single exit value command is expected to return, otherwise causes an exception
# ignore_failure<Boolean>: Whether to raise an exception on failure, or just return the status
# output_on_failure<Boolean>: Return output in raised exception regardless of Log.level
#
# user<String>: The UID or user name of the user to execute the command as
# group<String>: The GID or group name of the group to execute the command as
# environment<Hash>: Pairs of environment variable names and their values to set before execution
#
# === Returns
# Returns the exit status of args[:command]
def run_command(args={})
status, stdout, stderr = run_command_and_return_stdout_stderr(args)
status
end
# works same as above, except that it returns stdout and stderr
# requirement => platforms like solaris 9,10 has wierd issues where
# even in command failure the exit code is zero, so we need to lookup stderr.
def run_command_and_return_stdout_stderr(args={})
command_output = ""
args[:ignore_failure] ||= false
args[:output_on_failure] ||= false
# TODO: This is the wrong place for this responsibility.
if args.has_key?(:creates)
if File.exists?(args[:creates])
Chef::Log.debug("Skipping #{args[:command]} - creates #{args[:creates]} exists.")
return false
end
end
status, stdout, stderr = output_of_command(args[:command], args)
command_output << "STDOUT: #{stdout}"
command_output << "STDERR: #{stderr}"
handle_command_failures(status, command_output, args)
return status, stdout, stderr
end
def output_of_command(command, args)
Chef::Log.debug("Executing #{command}")
stderr_string, stdout_string, status = "", "", nil
exec_processing_block = lambda do |pid, stdin, stdout, stderr|
stdout_string, stderr_string = stdout.string.chomp, stderr.string.chomp
end
args[:cwd] ||= Dir.tmpdir
unless ::File.directory?(args[:cwd])
raise Chef::Exceptions::Exec, "#{args[:cwd]} does not exist or is not a directory"
end
Dir.chdir(args[:cwd]) do
if args[:timeout]
begin
Timeout.timeout(args[:timeout]) do
status = popen4(command, args, &exec_processing_block)
end
rescue Timeout::Error => e
Chef::Log.error("#{command} exceeded timeout #{args[:timeout]}")
raise(e)
end
else
status = popen4(command, args, &exec_processing_block)
end
Chef::Log.debug("---- Begin output of #{command} ----")
Chef::Log.debug("STDOUT: #{stdout_string}")
Chef::Log.debug("STDERR: #{stderr_string}")
Chef::Log.debug("---- End output of #{command} ----")
Chef::Log.debug("Ran #{command} returned #{status.exitstatus}")
end
return status, stdout_string, stderr_string
end
def handle_command_failures(status, command_output, opts={})
return if opts[:ignore_failure]
opts[:returns] ||= 0
return if Array(opts[:returns]).include?(status.exitstatus)
# if the log level is not debug, through output of command when we fail
output = ""
if Chef::Log.level == :debug || opts[:output_on_failure]
output << "\n---- Begin output of #{opts[:command]} ----\n"
output << command_output.to_s
output << "\n---- End output of #{opts[:command]} ----\n"
end
raise Chef::Exceptions::Exec, "#{opts[:command]} returned #{status.exitstatus}, expected #{opts[:returns]}#{output}"
end
# Call #run_command but set LC_ALL to the system's current environment so it doesn't get changed to C.
#
# === Parameters
# args<Hash>: A number of required and optional arguments that will be handed out to #run_command
#
# === Returns
# Returns the result of #run_command
def run_command_with_systems_locale(args={})
args[:environment] ||= {}
args[:environment]["LC_ALL"] = ENV["LC_ALL"]
run_command args
end
# def popen4(cmd, args={}, &b)
# @@os_handler.popen4(cmd, args, &b)
# end
# module_function :popen4
def chdir_or_tmpdir(dir, &block)
dir ||= Dir.tmpdir
unless File.directory?(dir)
raise Chef::Exceptions::Exec, "#{dir} does not exist or is not a directory"
end
Dir.chdir(dir) do
block.call
end
end
end
end
end
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