summaryrefslogtreecommitdiff
path: root/lib/chef/application.rb
blob: 4562d84a5d46a4abf5e6d656d1ca6dcca48dc275 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
#
# Author:: AJ Christensen (<aj@opscode.com>)
# Author:: Mark Mzyk (mmzyk@opscode.com)
# Copyright:: Copyright (c) 2008-2015 Chef Software, 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 "pp"
require "socket"
require "chef/config"
require "chef/config_fetcher"
require "chef/exceptions"
require "chef/local_mode"
require "chef/log"
require "chef/platform"
require "mixlib/cli"
require "tmpdir"
require "rbconfig"

class Chef
  class Application
    include Mixlib::CLI

    def initialize
      super

      @chef_client = nil
      @chef_client_json = nil

      # Always switch to a readable directory. Keeps subsequent Dir.chdir() {}
      # from failing due to permissions when launched as a less privileged user.
    end

    # Reconfigure the application. You'll want to override and super this method.
    def reconfigure
      configure_chef
      configure_logging
      configure_encoding
      emit_warnings
    end

    # Get this party started
    def run
      setup_signal_handlers
      reconfigure
      setup_application
      run_application
    end

    def setup_signal_handlers
      trap("INT") do
        Chef::Application.fatal!("SIGINT received, stopping", 2)
      end

      trap("TERM") do
        Chef::Application.fatal!("SIGTERM received, stopping", 3)
      end

      unless Chef::Platform.windows?
        trap("QUIT") do
          Chef::Log.info("SIGQUIT received, call stack:\n  " + caller.join("\n  "))
        end

        trap("HUP") do
          Chef::Log.info("SIGHUP received, reconfiguring")
          reconfigure
        end
      end
    end

    # Parse configuration (options and config file)
    def configure_chef
      parse_options
      load_config_file
      Chef::Config.export_proxies
    end

    # Parse the config file
    def load_config_file
      config_fetcher = Chef::ConfigFetcher.new(config[:config_file])
      if config[:config_file].nil?
        Chef::Log.warn("No config file found or specified on command line, using command line options.")
      elsif config_fetcher.config_missing?
        Chef::Log.warn("*****************************************")
        Chef::Log.warn("Did not find config file: #{config[:config_file]}, using command line options.")
        Chef::Log.warn("*****************************************")
      else
        config_content = config_fetcher.read_config
        apply_config(config_content, config[:config_file])
      end
      Chef::Config.merge!(config)
    end

    def set_specific_recipes
      Chef::Config[:specific_recipes] =
        cli_arguments.map { |file| File.expand_path(file) } if
        cli_arguments.respond_to?(:map)
    end

    # Initialize and configure the logger.
    # === Loggers and Formatters
    # In Chef 10.x and previous, the Logger was the primary/only way that Chef
    # communicated information to the user. In Chef 10.14, a new system, "output
    # formatters" was added, and in Chef 11.0+ it is the default when running
    # chef in a console (detected by `STDOUT.tty?`). Because output formatters
    # are more complex than the logger system and users have less experience with
    # them, the config option `force_logger` is provided to restore the Chef 10.x
    # behavior.
    #
    # Conversely, for users who want formatter output even when chef is running
    # unattended, the `force_formatter` option is provided.
    #
    # === Auto Log Level
    # When `log_level` is set to `:auto` (default), the log level will be `:warn`
    # when the primary output mode is an output formatter (see
    # +using_output_formatter?+) and `:info` otherwise.
    #
    # === Automatic STDOUT Logging
    # When `force_logger` is configured (e.g., Chef 10 mode), a second logger
    # with output on STDOUT is added when running in a console (STDOUT is a tty)
    # and the configured log_location isn't STDOUT. This accounts for the case
    # that a user has configured a log_location in client.rb, but is running
    # chef-client by hand to troubleshoot a problem.
    def configure_logging
      Chef::Log.init(MonoLogger.new(Chef::Config[:log_location]))
      if want_additional_logger?
        configure_stdout_logger
      end
      Chef::Log.level = resolve_log_level
    rescue StandardError => error
      Chef::Log.fatal("Failed to open or create log file at #{Chef::Config[:log_location]}: #{error.class} (#{error.message})")
      Chef::Application.fatal!("Aborting due to invalid 'log_location' configuration", 2)
    end

    def configure_stdout_logger
      stdout_logger = MonoLogger.new(STDOUT)
      stdout_logger.formatter = Chef::Log.logger.formatter
      Chef::Log.loggers <<  stdout_logger
    end

    # Based on config and whether or not STDOUT is a tty, should we setup a
    # secondary logger for stdout?
    def want_additional_logger?
      ( Chef::Config[:log_location] != STDOUT ) && STDOUT.tty? && (!Chef::Config[:daemonize]) && (Chef::Config[:force_logger])
    end

    # Use of output formatters is assumed if `force_formatter` is set or if
    # `force_logger` is not set and STDOUT is to a console (tty)
    def using_output_formatter?
      Chef::Config[:force_formatter] || (!Chef::Config[:force_logger] && STDOUT.tty?)
    end

    def auto_log_level?
      Chef::Config[:log_level] == :auto
    end

    # if log_level is `:auto`, convert it to :warn (when using output formatter)
    # or :info (no output formatter). See also +using_output_formatter?+
    def resolve_log_level
      if auto_log_level?
        if using_output_formatter?
          :warn
        else
          :info
        end
      else
        Chef::Config[:log_level]
      end
    end

    # Sets the default external encoding to UTF-8 (users can change this, but they shouldn't)
    def configure_encoding
      Encoding.default_external = Chef::Config[:ruby_encoding]
    end

    # Called prior to starting the application, by the run method
    def setup_application
      raise Chef::Exceptions::Application, "#{self}: you must override setup_application"
    end

    # Actually run the application
    def run_application
      raise Chef::Exceptions::Application, "#{self}: you must override run_application"
    end

    # Initializes Chef::Client instance and runs it
    def run_chef_client(specific_recipes = [])
      unless specific_recipes.respond_to?(:size)
        raise ArgumentError, "received non-Array like specific_recipes argument"
      end

      Chef::LocalMode.with_server_connectivity do
        override_runlist = config[:override_runlist]
        override_runlist ||= [] if specific_recipes.size > 0
        @chef_client = Chef::Client.new(
          @chef_client_json,
          override_runlist: override_runlist,
          specific_recipes: specific_recipes,
          runlist: config[:runlist],
        )
        @chef_client_json = nil

        if can_fork?
          fork_chef_client # allowed to run client in forked process
        else
          # Unforked interval runs are disabled, so this runs chef-client
          # once and then exits. If TERM signal is received, will "ignore"
          # the signal to finish converge.
          run_with_graceful_exit_option
        end
        @chef_client = nil
      end
    end

    private
    def can_fork?
      # win32-process gem exposes some form of :fork for Process
      # class. So we are separately ensuring that the platform we're
      # running on is not windows before forking.
      Chef::Config[:client_fork] && Process.respond_to?(:fork) && !Chef::Platform.windows?
    end

    # Run chef-client once and then exit. If TERM signal is received, ignores the
    # signal to finish the converge and exists.
    def run_with_graceful_exit_option
      # Override the TERM signal.
      trap("TERM") do
        Chef::Log.debug("SIGTERM received during converge," +
          " finishing converge to exit normally (send SIGINT to terminate immediately)")
      end

      @chef_client.run
      true
    end

    def fork_chef_client
      Chef::Log.info "Forking chef instance to converge..."
      pid = fork do
        # Want to allow forked processes to finish converging when
        # TERM singal is received (exit gracefully)
        trap("TERM") do
          Chef::Log.debug("SIGTERM received during converge," +
            " finishing converge to exit normally (send SIGINT to terminate immediately)")
        end

        client_solo = Chef::Config[:solo] ? "chef-solo" : "chef-client"
        $0 = "#{client_solo} worker: ppid=#{Process.ppid};start=#{Time.new.strftime("%R:%S")};"
        begin
          Chef::Log.debug "Forked instance now converging"
          @chef_client.run
        rescue Exception => e
          Chef::Log.error(e.to_s)
          exit 1
        else
          exit 0
        end
      end
      Chef::Log.debug "Fork successful. Waiting for new chef pid: #{pid}"
      result = Process.waitpid2(pid)
      handle_child_exit(result)
      Chef::Log.debug "Forked instance successfully reaped (pid: #{pid})"
      true
    end

    def handle_child_exit(pid_and_status)
      status = pid_and_status[1]
      return true if status.success?
      message = if status.signaled?
                  "Chef run process terminated by signal #{status.termsig} (#{Signal.list.invert[status.termsig]})"
                else
                  "Chef run process exited unsuccessfully (exit code #{status.exitstatus})"
                end
      raise Exceptions::ChildConvergeError, message
    end

    def apply_config(config_content, config_file_path)
      Chef::Config.from_string(config_content, config_file_path)
    rescue Exception => error
      Chef::Log.fatal("Configuration error #{error.class}: #{error.message}")
      filtered_trace = error.backtrace.grep(/#{Regexp.escape(config_file_path)}/)
      filtered_trace.each {|line| Chef::Log.fatal("  " + line )}
      Chef::Application.fatal!("Aborting due to error in '#{config_file_path}'", 2)
    end

    # This is a hook for testing
    def env
      ENV
    end

    def emit_warnings
      if Chef::Config[:chef_gem_compile_time]
        Chef.log_deprecation "setting chef_gem_compile_time to true is deprecated"
      end
    end

    class << self
      def debug_stacktrace(e)
        message = "#{e.class}: #{e}\n#{e.backtrace.join("\n")}"
        chef_stacktrace_out = "Generated at #{Time.now}\n"
        chef_stacktrace_out += message

        Chef::FileCache.store("chef-stacktrace.out", chef_stacktrace_out)
        Chef::Log.fatal("Stacktrace dumped to #{Chef::FileCache.load("chef-stacktrace.out", false)}")
        Chef::Log.fatal("Please provide the contents of the stacktrace.out file if you file a bug report")
        Chef::Log.debug(message)
        true
      end

      # Log a fatal error message to both STDERR and the Logger, exit the application
      def fatal!(msg, err = -1)
        Chef::Log.fatal(msg)
        Process.exit err
      end

      def exit!(msg, err = -1)
        Chef::Log.debug(msg)
        Process.exit err
      end
    end

  end
end