summaryrefslogtreecommitdiff
path: root/lib/chef/provider/deploy.rb
blob: 60c626ab08ac6b7cf94b5ce8e836a48b7e04044d (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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
#
# Author:: Daniel DeLeo (<dan@kallistec.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/mixin/command"
require "chef/mixin/from_file"
require "chef/provider/git"
require "chef/provider/subversion"
require 'chef/dsl/recipe'

class Chef
  class Provider
    class Deploy < Chef::Provider

      include Chef::DSL::Recipe
      include Chef::Mixin::FromFile
      include Chef::Mixin::Command

      attr_reader :scm_provider, :release_path, :previous_release_path

      def initialize(new_resource, run_context)
        super(new_resource, run_context)

        # will resolve to ither git or svn based on resource attributes , 
        # and will create a resource corresponding to that provider 
        @scm_provider = new_resource.scm_provider.new(new_resource, run_context)

        # @configuration is not used by Deploy, it is only for backwards compat with
        # chef-deploy or capistrano hooks that might use it to get environment information
        @configuration = @new_resource.to_hash
        @configuration[:environment] = @configuration[:environment] && @configuration[:environment]["RAILS_ENV"]
      end

      def whyrun_supported?
        true
      end

      def load_current_resource
        @scm_provider.load_current_resource
        @release_path = @new_resource.deploy_to + "/releases/#{release_slug}"
      end

      def sudo(command,&block)
        execute(command, &block)
      end

      def run(command, &block)
        exec = execute(command, &block)
        exec.user(@new_resource.user) if @new_resource.user
        exec.group(@new_resource.group) if @new_resource.group
        exec.cwd(release_path) unless exec.cwd
        exec.environment(@new_resource.environment) unless exec.environment
        converge_by("execute #{command}") do
          exec
        end
      end

      def define_resource_requirements
        requirements.assert(:rollback) do |a|
          a.assertion { all_releases[-2] }
          a.failure_message(RuntimeError, "There is no release to rollback to!")
          #There is no reason to assume 2 deployments in a single chef run, hence fails in whyrun.
        end

        [ @new_resource.before_migrate, @new_resource.before_symlink, 
          @new_resource.before_restart, @new_resource.after_restart ].each do |script|
          requirements.assert(:deploy, :force_deploy) do |a|
            callback_file = "#{release_path}/#{script}"
            a.assertion do 
              if script && script.class == String
                ::File.exist?(callback_file)
              else
                true
              end
            end
            a.failure_message(RuntimeError, "Can't find your callback file #{callback_file}")
            a.whyrun("Would assume callback file #{callback_file} included in release")
          end
        end

      end

      def action_deploy
        save_release_state
        if deployed?(release_path )
          if current_release?(release_path ) 
            Chef::Log.debug("#{@new_resource} is the latest version")
          else
            rollback_to release_path
          end
        else

          with_rollback_on_error do
            deploy
          end
        end
      end

      def action_force_deploy
        if deployed?(release_path)
          converge_by("delete deployed app at #{release_path} prior to force-deploy") do 
            Chef::Log.info("Already deployed app at #{release_path}, forcing.")
            FileUtils.rm_rf(release_path)
            Chef::Log.info("#{@new_resource} forcing deploy of already deployed app at #{release_path}")
          end
        end

        # Alternatives:
        # * Move release_path directory before deploy and move it back when error occurs
        # * Rollback to previous commit
        # * Do nothing - because deploy is force, it will be retried in short time
        # Because last is simpliest, keep it
        deploy
      end

      def action_rollback
        rollback_to all_releases[-2]
      end

      def rollback_to(target_release_path)
        @release_path = target_release_path

        rp_index = all_releases.index(release_path)
        releases_to_nuke = all_releases[(rp_index + 1)..-1]

        rollback

        releases_to_nuke.each do |i|
          converge_by("roll back by removing release #{i}") do
            Chef::Log.info "#{@new_resource} removing release: #{i}"
            FileUtils.rm_rf i
          end
          release_deleted(i)
        end
      end

      def deploy
        verify_directories_exist
        # CHEF-3435: We need to create the directories if they don't exist before calling the
        # scm_provider because it expects them to be there in its own assertations
        unless self.converge_actions.empty?
          Chef::Log.info "#{@new_resource} running collected converge_actions before calling scm_provider"
          self.converge_actions.converge!
        end
        update_cached_repo # no converge-by - scm provider will dothis
        enforce_ownership
        copy_cached_repo
        install_gems
        enforce_ownership
        callback(:before_migrate, @new_resource.before_migrate)
        migrate
        callback(:before_symlink, @new_resource.before_symlink)
        symlink
        callback(:before_restart, @new_resource.before_restart)
        restart
        callback(:after_restart, @new_resource.after_restart)
        cleanup!
        Chef::Log.info "#{@new_resource} deployed to #{@new_resource.deploy_to}"
      end

      def rollback
        Chef::Log.info "#{@new_resource} rolling back to previous release #{release_path}"
        symlink
        Chef::Log.info "#{@new_resource} restarting with previous release"
        restart
      end


      def callback(what, callback_code=nil)
        @collection = Chef::ResourceCollection.new
        case callback_code
        when Proc
          Chef::Log.info "#{@new_resource} running callback #{what}"
          recipe_eval(&callback_code)
        when String
          run_callback_from_file("#{release_path}/#{callback_code}")
        when nil
          run_callback_from_file("#{release_path}/deploy/#{what}.rb")
        end
      end

      def migrate
        run_symlinks_before_migrate

        if @new_resource.migrate
          enforce_ownership

          environment = @new_resource.environment
          env_info = environment && environment.map do |key_and_val|
            "#{key_and_val.first}='#{key_and_val.last}'"
          end.join(" ")

          converge_by("execute migration command #{@new_resource.migration_command}") do
            Chef::Log.info "#{@new_resource} migrating #{@new_resource.user} with environment #{env_info}"
            run_command(run_options(:command => @new_resource.migration_command, :cwd=>release_path, :log_level => :info))
          end
        end
      end

      def symlink
        purge_tempfiles_from_current_release
        link_tempfiles_to_current_release
        link_current_release_to_production
        Chef::Log.info "#{@new_resource} updated symlinks"
      end

      def restart
        if restart_cmd = @new_resource.restart_command
          if restart_cmd.kind_of?(Proc)
            Chef::Log.info("#{@new_resource} restarting app with embedded recipe")
            recipe_eval(&restart_cmd)
          else
            converge_by("restart app using command #{@new_resource.restart_command}") do
              Chef::Log.info("#{@new_resource} restarting app")
              run_command(run_options(:command => @new_resource.restart_command, :cwd => @new_resource.current_path))
            end
          end
        end
      end

      def cleanup!
        chop = -1 - @new_resource.keep_releases
        all_releases[0..chop].each do |old_release|
          converge_by("remove old release #{old_release}") do
            Chef::Log.info "#{@new_resource} removing old release #{old_release}"
            FileUtils.rm_rf(old_release)
          end
          release_deleted(old_release)
        end
      end

      def all_releases
        Dir.glob(@new_resource.deploy_to + "/releases/*").sort
      end

      def update_cached_repo
        if @new_resource.svn_force_export
        # TODO assertion, non-recoverable - @scm_provider must be svn if force_export?
          svn_force_export
        else
          run_scm_sync
        end
      end

      def run_scm_sync
        @scm_provider.run_action(:sync)
      end

      def svn_force_export
        Chef::Log.info "#{@new_resource} exporting source repository"
        @scm_provider.run_action(:force_export)
      end

      def copy_cached_repo
        target_dir_path = @new_resource.deploy_to + "/releases"
        converge_by("deploy from repo to #{@target_dir_path} ") do
          FileUtils.mkdir_p(target_dir_path)
          run_command(:command => "cp -RPp #{::File.join(@new_resource.destination, ".")} #{release_path}")
          Chef::Log.info "#{@new_resource} copied the cached checkout to #{release_path}"
          release_created(release_path)
        end
      end

      def enforce_ownership
        converge_by("force ownership of #{@new_resource.deploy_to} to #{@new_resource.group}:#{@new_resource.user}") do
          FileUtils.chown_R(@new_resource.user, @new_resource.group, @new_resource.deploy_to)
          Chef::Log.info("#{@new_resource} set user to #{@new_resource.user}") if @new_resource.user
          Chef::Log.info("#{@new_resource} set group to #{@new_resource.group}") if @new_resource.group
        end
      end

      def verify_directories_exist
        create_dir_unless_exists(@new_resource.deploy_to)
        create_dir_unless_exists(@new_resource.shared_path)
      end

      def link_current_release_to_production
        converge_by(["remove existing link at #{@new_resource.current_path}", 
                    "link release #{release_path} into production at #{@new_resource.current_path}"]) do
          FileUtils.rm_f(@new_resource.current_path)
          begin
            FileUtils.ln_sf(release_path, @new_resource.current_path)
            rescue => e
              raise Chef::Exceptions::FileNotFound.new("Cannot symlink current release to production: #{e.message}")
            end
          Chef::Log.info "#{@new_resource} linked release #{release_path} into production at #{@new_resource.current_path}"
        end
        enforce_ownership
      end

      def run_symlinks_before_migrate
        links_info = @new_resource.symlink_before_migrate.map { |src, dst| "#{src} => #{dst}" }.join(", ")
        converge_by("make pre-migration symliinks: #{links_info}") do
          @new_resource.symlink_before_migrate.each do |src, dest|
            begin
              FileUtils.ln_sf(@new_resource.shared_path + "/#{src}", release_path + "/#{dest}")
            rescue => e
              raise Chef::Exceptions::FileNotFound.new("Cannot symlink #{@new_resource.shared_path}/#{src} to #{release_path}/#{dest} before migrate: #{e.message}")
            end
          end
          Chef::Log.info "#{@new_resource} made pre-migration symlinks"
        end
      end

      def link_tempfiles_to_current_release
        dirs_info = @new_resource.create_dirs_before_symlink.join(",")
        @new_resource.create_dirs_before_symlink.each do |dir| 
          create_dir_unless_exists(release_path + "/#{dir}")
        end
        Chef::Log.info("#{@new_resource} created directories before symlinking: #{dirs_info}")

        links_info = @new_resource.symlinks.map { |src, dst| "#{src} => #{dst}" }.join(", ")
        converge_by("link shared paths into current release:  #{links_info}") do
          @new_resource.symlinks.each do |src, dest|
            begin
              FileUtils.ln_sf(::File.join(@new_resource.shared_path, src), ::File.join(release_path, dest))
            rescue => e
              raise Chef::Exceptions::FileNotFound.new("Cannot symlink shared data #{::File.join(@new_resource.shared_path, src)} to #{::File.join(release_path, dest)}: #{e.message}")
            end
          end
          Chef::Log.info("#{@new_resource} linked shared paths into current release: #{links_info}")
        end
        run_symlinks_before_migrate
        enforce_ownership
      end

      def create_dirs_before_symlink
      end

      def purge_tempfiles_from_current_release
        log_info = @new_resource.purge_before_symlink.join(", ")
        converge_by("purge directories in checkout #{log_info}") do
          @new_resource.purge_before_symlink.each { |dir| FileUtils.rm_rf(release_path + "/#{dir}") }
          Chef::Log.info("#{@new_resource} purged directories in checkout #{log_info}")
        end
      end

      protected

      # Internal callback, called after copy_cached_repo.
      # Override if you need to keep state externally.
      # Note that YOU are responsible for implementing whyrun-friendly behavior 
      # in any actions you take in this callback. 
      def release_created(release_path)
      end

      # Note that YOU are responsible for using appropriate whyrun nomenclature
      # Override if you need to keep state externally.
      # Note that YOU are responsible for implementing whyrun-friendly behavior 
      # in any actions you take in this callback. 
      def release_deleted(release_path)
      end

      def release_slug
        raise Chef::Exceptions::Override, "You must override release_slug in #{self.to_s}"
      end

      def install_gems
        gem_resource_collection_runner.converge
      end

      def gem_resource_collection_runner
        gems_collection = Chef::ResourceCollection.new
        gem_packages.each { |rbgem| gems_collection << rbgem }
        gems_run_context = run_context.dup
        gems_run_context.resource_collection = gems_collection
        Chef::Runner.new(gems_run_context)
      end

      def gem_packages
        return [] unless ::File.exist?("#{release_path}/gems.yml")
        gems = YAML.load(IO.read("#{release_path}/gems.yml"))

        gems.map do |g|
          r = Chef::Resource::GemPackage.new(g[:name], run_context)
          r.version g[:version]
          r.action :install
          r.source "http://gems.github.com"
          r
        end
      end

      def run_options(run_opts={})
        run_opts[:user] = @new_resource.user if @new_resource.user
        run_opts[:group] = @new_resource.group if @new_resource.group
        run_opts[:environment] = @new_resource.environment if @new_resource.environment
        run_opts[:log_tag] = @new_resource.to_s
        run_opts[:log_level] ||= :debug
        if run_opts[:log_level] == :info
          if STDOUT.tty? && !Chef::Config[:daemon] && Chef::Log.info?
            run_opts[:live_stream] = STDOUT
          end
        end
        run_opts
      end

      def run_callback_from_file(callback_file)
        Chef::Log.info "#{@new_resource} queueing checkdeploy hook #{callback_file}"
        recipe_eval do
          Dir.chdir(release_path) do
            from_file(callback_file) if ::File.exist?(callback_file)
          end
        end
      end

      def create_dir_unless_exists(dir)
        if ::File.directory?(dir)
          Chef::Log.debug "#{@new_resource} not creating #{dir} because it already exists"
          return false
        end
        converge_by("create new directory #{dir}") do
          begin
            FileUtils.mkdir_p(dir)
            Chef::Log.debug "#{@new_resource} created directory #{dir}"
            if @new_resource.user
              FileUtils.chown(@new_resource.user, nil, dir)
              Chef::Log.debug("#{@new_resource} set user to #{@new_resource.user} for #{dir}")
            end
            if @new_resource.group
              FileUtils.chown(nil, @new_resource.group, dir)
              Chef::Log.debug("#{@new_resource} set group to #{@new_resource.group} for #{dir}")
            end
          rescue => e
            raise Chef::Exceptions::FileNotFound.new("Cannot create directory #{dir}: #{e.message}")
          end
        end
      end

      def with_rollback_on_error
        yield
      rescue ::Exception => e
        if @new_resource.rollback_on_error
          Chef::Log.warn "Error on deploying #{release_path}: #{e.message}" 
          failed_release = release_path
        
          if previous_release_path
            @release_path = previous_release_path
            rollback
          end
          converge_by("remove failed deploy #{failed_release}") do
            Chef::Log.info "Removing failed deploy #{failed_release}"
            FileUtils.rm_rf failed_release
          end
          release_deleted(failed_release)
        end
        
        raise
      end

      def save_release_state
        if ::File.exists?(@new_resource.current_path)
          release = ::File.readlink(@new_resource.current_path)
          @previous_release_path = release if ::File.exists?(release)
        end
      end

      def deployed?(release)
        all_releases.include?(release)
      end

      def current_release?(release)
        @previous_release_path == release
      end
    end
  end
end