services/api/app/models/container.rb

   1 # Copyright (C) The Arvados Authors. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: AGPL-3.0
   4
   5 require 'log_reuse_info'
   6 require 'whitelist_update'
   7 require 'safe_json'
   8 require 'update_priority'
   9
  10 class Container < ArvadosModel
  11   include ArvadosModelUpdates
  12   include HasUuid
  13   include KindAndEtag
  14   include CommonApiTemplate
  15   include WhitelistUpdate
  16   extend CurrentApiClient
  17   extend DbCurrentTime
  18   extend LogReuseInfo
  19
  20   # Posgresql JSONB columns should NOT be declared as serialized, Rails 5
  21   # already know how to properly treat them.
  22   attribute :secret_mounts, :jsonbHash, default: {}
  23   attribute :runtime_status, :jsonbHash, default: {}
  24   attribute :runtime_auth_scopes, :jsonbHash, default: {}
  25
  26   serialize :environment, Hash
  27   serialize :mounts, Hash
  28   serialize :runtime_constraints, Hash
  29   serialize :command, Array
  30   serialize :scheduling_parameters, Hash
  31
  32   before_validation :fill_field_defaults, :if => :new_record?
  33   before_validation :set_timestamps
  34   validates :command, :container_image, :output_path, :cwd, :priority, { presence: true }
  35   validates :priority, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  36   validate :validate_runtime_status
  37   validate :validate_state_change
  38   validate :validate_change
  39   validate :validate_lock
  40   validate :validate_output
  41   after_validation :assign_auth
  42   before_save :sort_serialized_attrs
  43   before_save :update_secret_mounts_md5
  44   before_save :scrub_secrets
  45   before_save :clear_runtime_status_when_queued
  46   after_save :update_cr_logs
  47   after_save :handle_completed
  48   after_save :propagate_priority
  49   after_commit { UpdatePriority.run_update_thread }
  50
  51   has_many :container_requests, :foreign_key => :container_uuid, :class_name => 'ContainerRequest', :primary_key => :uuid
  52   belongs_to :auth, :class_name => 'ApiClientAuthorization', :foreign_key => :auth_uuid, :primary_key => :uuid
  53
  54   api_accessible :user, extend: :common do |t|
  55     t.add :command
  56     t.add :container_image
  57     t.add :cwd
  58     t.add :environment
  59     t.add :exit_code
  60     t.add :finished_at
  61     t.add :locked_by_uuid
  62     t.add :log
  63     t.add :mounts
  64     t.add :output
  65     t.add :output_path
  66     t.add :priority
  67     t.add :progress
  68     t.add :runtime_constraints
  69     t.add :runtime_status
  70     t.add :started_at
  71     t.add :state
  72     t.add :auth_uuid
  73     t.add :scheduling_parameters
  74     t.add :runtime_user_uuid
  75     t.add :runtime_auth_scopes
  76   end
  77
  78   # Supported states for a container
  79   States =
  80     [
  81      (Queued = 'Queued'),
  82      (Locked = 'Locked'),
  83      (Running = 'Running'),
  84      (Complete = 'Complete'),
  85      (Cancelled = 'Cancelled')
  86     ]
  87
  88   State_transitions = {
  89     nil => [Queued],
  90     Queued => [Locked, Cancelled],
  91     Locked => [Queued, Running, Cancelled],
  92     Running => [Complete, Cancelled]
  93   }
  94
  95   def self.limit_index_columns_read
  96     ["mounts"]
  97   end
  98
  99   def self.full_text_searchable_columns
 100     super - ["secret_mounts", "secret_mounts_md5", "runtime_token"]
 101   end
 102
 103   def self.searchable_columns *args
 104     super - ["secret_mounts_md5", "runtime_token"]
 105   end
 106
 107   def logged_attributes
 108     super.except('secret_mounts', 'runtime_token')
 109   end
 110
 111   def state_transitions
 112     State_transitions
 113   end
 114
 115   # Container priority is the highest "computed priority" of any
 116   # matching request. The computed priority of a container-submitted
 117   # request is the priority of the submitting container. The computed
 118   # priority of a user-submitted request is a function of
 119   # user-assigned priority and request creation time.
 120   def update_priority!
 121     return if ![Queued, Locked, Running].include?(state)
 122     p = ContainerRequest.
 123         where('container_uuid=? and priority>0', uuid).
 124         includes(:requesting_container).
 125         lock(true).
 126         map do |cr|
 127       if cr.requesting_container
 128         cr.requesting_container.priority
 129       else
 130         (cr.priority << 50) - (cr.created_at.to_time.to_f * 1000).to_i
 131       end
 132     end.max || 0
 133     update_attributes!(priority: p)
 134   end
 135
 136   def propagate_priority
 137     return true unless priority_changed?
 138     act_as_system_user do
 139       # Update the priority of child container requests to match new
 140       # priority of the parent container (ignoring requests with no
 141       # container assigned, because their priority doesn't matter).
 142       ContainerRequest.
 143         where(requesting_container_uuid: self.uuid,
 144               state: ContainerRequest::Committed).
 145         where('container_uuid is not null').
 146         includes(:container).
 147         map(&:container).
 148         map(&:update_priority!)
 149     end
 150   end
 151
 152   # Create a new container (or find an existing one) to satisfy the
 153   # given container request.
 154   def self.resolve(req)
 155     if req.runtime_token.nil?
 156       runtime_user = if req.modified_by_user_uuid.nil?
 157                        current_user
 158                      else
 159                        User.find_by_uuid(req.modified_by_user_uuid)
 160                      end
 161       runtime_auth_scopes = ["all"]
 162     else
 163       auth = ApiClientAuthorization.validate(token: req.runtime_token)
 164       if auth.nil?
 165         raise ArgumentError.new "Invalid runtime token"
 166       end
 167       runtime_user = User.find_by_id(auth.user_id)
 168       runtime_auth_scopes = auth.scopes
 169     end
 170     c_attrs = act_as_user runtime_user do
 171       {
 172         command: req.command,
 173         cwd: req.cwd,
 174         environment: req.environment,
 175         output_path: req.output_path,
 176         container_image: resolve_container_image(req.container_image),
 177         mounts: resolve_mounts(req.mounts),
 178         runtime_constraints: resolve_runtime_constraints(req.runtime_constraints),
 179         scheduling_parameters: req.scheduling_parameters,
 180         secret_mounts: req.secret_mounts,
 181         runtime_token: req.runtime_token,
 182         runtime_user_uuid: runtime_user.uuid,
 183         runtime_auth_scopes: runtime_auth_scopes
 184       }
 185     end
 186     act_as_system_user do
 187       if req.use_existing && (reusable = find_reusable(c_attrs))
 188         reusable
 189       else
 190         Container.create!(c_attrs)
 191       end
 192     end
 193   end
 194
 195   # Return a runtime_constraints hash that complies with requested but
 196   # is suitable for saving in a container record, i.e., has specific
 197   # values instead of ranges.
 198   #
 199   # Doing this as a step separate from other resolutions, like "git
 200   # revision range to commit hash", makes sense only when there is no
 201   # opportunity to reuse an existing container (e.g., container reuse
 202   # is not implemented yet, or we have already found that no existing
 203   # containers are suitable).
 204   def self.resolve_runtime_constraints(runtime_constraints)
 205     rc = {}
 206     defaults = {
 207       'keep_cache_ram' =>
 208       Rails.configuration.container_default_keep_cache_ram,
 209     }
 210     defaults.merge(runtime_constraints).each do |k, v|
 211       if v.is_a? Array
 212         rc[k] = v[0]
 213       else
 214         rc[k] = v
 215       end
 216     end
 217     rc
 218   end
 219
 220   # Return a mounts hash suitable for a Container, i.e., with every
 221   # readonly collection UUID resolved to a PDH.
 222   def self.resolve_mounts(mounts)
 223     c_mounts = {}
 224     mounts.each do |k, mount|
 225       mount = mount.dup
 226       c_mounts[k] = mount
 227       if mount['kind'] != 'collection'
 228         next
 229       end
 230
 231       uuid = mount.delete 'uuid'
 232
 233       if mount['portable_data_hash'].nil? and !uuid.nil?
 234         # PDH not supplied, try by UUID
 235         c = Collection.
 236           readable_by(current_user).
 237           where(uuid: uuid).
 238           select(:portable_data_hash).
 239           first
 240         if !c
 241           raise ArvadosModel::UnresolvableContainerError.new "cannot mount collection #{uuid.inspect}: not found"
 242         end
 243         mount['portable_data_hash'] = c.portable_data_hash
 244       end
 245     end
 246     return c_mounts
 247   end
 248
 249   # Return a container_image PDH suitable for a Container.
 250   def self.resolve_container_image(container_image)
 251     coll = Collection.for_latest_docker_image(container_image)
 252     if !coll
 253       raise ArvadosModel::UnresolvableContainerError.new "docker image #{container_image.inspect} not found"
 254     end
 255     coll.portable_data_hash
 256   end
 257
 258   def self.find_reusable(attrs)
 259     log_reuse_info { "starting with #{Container.all.count} container records in database" }
 260     candidates = Container.where_serialized(:command, attrs[:command], md5: true)
 261     log_reuse_info(candidates) { "after filtering on command #{attrs[:command].inspect}" }
 262
 263     candidates = candidates.where('cwd = ?', attrs[:cwd])
 264     log_reuse_info(candidates) { "after filtering on cwd #{attrs[:cwd].inspect}" }
 265
 266     candidates = candidates.where_serialized(:environment, attrs[:environment], md5: true)
 267     log_reuse_info(candidates) { "after filtering on environment #{attrs[:environment].inspect}" }
 268
 269     candidates = candidates.where('output_path = ?', attrs[:output_path])
 270     log_reuse_info(candidates) { "after filtering on output_path #{attrs[:output_path].inspect}" }
 271
 272     image = resolve_container_image(attrs[:container_image])
 273     candidates = candidates.where('container_image = ?', image)
 274     log_reuse_info(candidates) { "after filtering on container_image #{image.inspect} (resolved from #{attrs[:container_image].inspect})" }
 275
 276     candidates = candidates.where_serialized(:mounts, resolve_mounts(attrs[:mounts]), md5: true)
 277     log_reuse_info(candidates) { "after filtering on mounts #{attrs[:mounts].inspect}" }
 278
 279     secret_mounts_md5 = Digest::MD5.hexdigest(SafeJSON.dump(self.deep_sort_hash(attrs[:secret_mounts])))
 280     candidates = candidates.where('secret_mounts_md5 = ?', secret_mounts_md5)
 281     log_reuse_info(candidates) { "after filtering on secret_mounts_md5 #{secret_mounts_md5.inspect}" }
 282
 283     candidates = candidates.where_serialized(:runtime_constraints, resolve_runtime_constraints(attrs[:runtime_constraints]), md5: true)
 284     log_reuse_info(candidates) { "after filtering on runtime_constraints #{attrs[:runtime_constraints].inspect}" }
 285
 286     log_reuse_info { "checking for state=Complete with readable output and log..." }
 287
 288     select_readable_pdh = Collection.
 289       readable_by(current_user).
 290       select(:portable_data_hash).
 291       to_sql
 292
 293     usable = candidates.where(state: Complete, exit_code: 0)
 294     log_reuse_info(usable) { "with state=Complete, exit_code=0" }
 295
 296     usable = usable.where("log IN (#{select_readable_pdh})")
 297     log_reuse_info(usable) { "with readable log" }
 298
 299     usable = usable.where("output IN (#{select_readable_pdh})")
 300     log_reuse_info(usable) { "with readable output" }
 301
 302     usable = usable.order('finished_at ASC').limit(1).first
 303     if usable
 304       log_reuse_info { "done, reusing container #{usable.uuid} with state=Complete" }
 305       return usable
 306     end
 307
 308     # Check for non-failing Running candidates and return the most likely to finish sooner.
 309     log_reuse_info { "checking for state=Running..." }
 310     running = candidates.where(state: Running).
 311               where("(runtime_status->'error') is null").
 312               order('progress desc, started_at asc').
 313               limit(1).first
 314     if running
 315       log_reuse_info { "done, reusing container #{running.uuid} with state=Running" }
 316       return running
 317     else
 318       log_reuse_info { "have no containers in Running state" }
 319     end
 320
 321     # Check for Locked or Queued ones and return the most likely to start first.
 322     locked_or_queued = candidates.
 323                        where("state IN (?)", [Locked, Queued]).
 324                        order('state asc, priority desc, created_at asc').
 325                        limit(1).first
 326     if locked_or_queued
 327       log_reuse_info { "done, reusing container #{locked_or_queued.uuid} with state=#{locked_or_queued.state}" }
 328       return locked_or_queued
 329     else
 330       log_reuse_info { "have no containers in Locked or Queued state" }
 331     end
 332
 333     log_reuse_info { "done, no reusable container found" }
 334     nil
 335   end
 336
 337   def check_lock_fail
 338     if self.state != Queued
 339       raise LockFailedError.new("cannot lock when #{self.state}")
 340     elsif self.priority <= 0
 341       raise LockFailedError.new("cannot lock when priority<=0")
 342     end
 343   end
 344
 345   def lock
 346     # Check invalid state transitions once before getting the lock
 347     # (because it's cheaper that way) and once after getting the lock
 348     # (because state might have changed while acquiring the lock).
 349     check_lock_fail
 350     transaction do
 351       reload
 352       check_lock_fail
 353       update_attributes!(state: Locked, lock_count: self.lock_count+1)
 354     end
 355   end
 356
 357   def check_unlock_fail
 358     if self.state != Locked
 359       raise InvalidStateTransitionError.new("cannot unlock when #{self.state}")
 360     elsif self.locked_by_uuid != current_api_client_authorization.uuid
 361       raise InvalidStateTransitionError.new("locked by a different token")
 362     end
 363   end
 364
 365   def unlock
 366     # Check invalid state transitions twice (see lock)
 367     check_unlock_fail
 368     transaction do
 369       reload(lock: 'FOR UPDATE')
 370       check_unlock_fail
 371       if self.lock_count < Rails.configuration.max_container_dispatch_attempts
 372         update_attributes!(state: Queued)
 373       else
 374         update_attributes!(state: Cancelled,
 375                            runtime_status: {
 376                              error: "Container exceeded 'max_container_dispatch_attempts' (lock_count=#{self.lock_count}."
 377                            })
 378       end
 379     end
 380   end
 381
 382   def self.readable_by(*users_list)
 383     # Load optional keyword arguments, if they exist.
 384     if users_list.last.is_a? Hash
 385       kwargs = users_list.pop
 386     else
 387       kwargs = {}
 388     end
 389     if users_list.select { |u| u.is_admin }.any?
 390       return super
 391     end
 392     Container.where(ContainerRequest.readable_by(*users_list).where("containers.uuid = container_requests.container_uuid").exists)
 393   end
 394
 395   def final?
 396     [Complete, Cancelled].include?(self.state)
 397   end
 398
 399   def self.for_current_token
 400     return if !current_api_client_authorization
 401     _, _, _, container_uuid = Thread.current[:token].split('/')
 402     if container_uuid.nil?
 403       Container.where(auth_uuid: current_api_client_authorization.uuid).first
 404     else
 405       Container.where('auth_uuid=? or (uuid=? and runtime_token=?)',
 406                       current_api_client_authorization.uuid,
 407                       container_uuid,
 408                       current_api_client_authorization.token).first
 409     end
 410   end
 411
 412   protected
 413
 414   def fill_field_defaults
 415     self.state ||= Queued
 416     self.environment ||= {}
 417     self.runtime_constraints ||= {}
 418     self.mounts ||= {}
 419     self.cwd ||= "."
 420     self.priority ||= 0
 421     self.scheduling_parameters ||= {}
 422   end
 423
 424   def permission_to_create
 425     current_user.andand.is_admin
 426   end
 427
 428   def ensure_owner_uuid_is_permitted
 429     # validate_change ensures owner_uuid can't be changed at all --
 430     # except during create, which requires admin privileges. Checking
 431     # permission here would be superfluous.
 432     true
 433   end
 434
 435   def set_timestamps
 436     if self.state_changed? and self.state == Running
 437       self.started_at ||= db_current_time
 438     end
 439
 440     if self.state_changed? and [Complete, Cancelled].include? self.state
 441       self.finished_at ||= db_current_time
 442     end
 443   end
 444
 445   # Check that well-known runtime status keys have desired data types
 446   def validate_runtime_status
 447     [
 448       'error', 'errorDetail', 'warning', 'warningDetail', 'activity'
 449     ].each do |k|
 450       if self.runtime_status.andand.include?(k) && !self.runtime_status[k].is_a?(String)
 451         errors.add(:runtime_status, "'#{k}' value must be a string")
 452       end
 453     end
 454   end
 455
 456   def validate_change
 457     permitted = [:state]
 458     progress_attrs = [:progress, :runtime_status, :log, :output]
 459     final_attrs = [:exit_code, :finished_at]
 460
 461     if self.new_record?
 462       permitted.push(:owner_uuid, :command, :container_image, :cwd,
 463                      :environment, :mounts, :output_path, :priority,
 464                      :runtime_constraints, :scheduling_parameters,
 465                      :secret_mounts, :runtime_token,
 466                      :runtime_user_uuid, :runtime_auth_scopes)
 467     end
 468
 469     case self.state
 470     when Locked
 471       permitted.push :priority, :runtime_status, :log, :lock_count
 472
 473     when Queued
 474       permitted.push :priority
 475
 476     when Running
 477       permitted.push :priority, *progress_attrs
 478       if self.state_changed?
 479         permitted.push :started_at
 480       end
 481
 482     when Complete
 483       if self.state_was == Running
 484         permitted.push *final_attrs, *progress_attrs
 485       end
 486
 487     when Cancelled
 488       case self.state_was
 489       when Running
 490         permitted.push :finished_at, *progress_attrs
 491       when Queued, Locked
 492         permitted.push :finished_at, :log, :runtime_status
 493       end
 494
 495     else
 496       # The state_transitions check will add an error message for this
 497       return false
 498     end
 499
 500     if self.state == Running &&
 501        !current_api_client_authorization.nil? &&
 502        (current_api_client_authorization.uuid == self.auth_uuid ||
 503         current_api_client_authorization.token == self.runtime_token)
 504       # The contained process itself can write final attrs but can't
 505       # change priority or log.
 506       permitted.push *final_attrs
 507       permitted = permitted - [:log, :priority]
 508     elsif self.locked_by_uuid && self.locked_by_uuid != current_api_client_authorization.andand.uuid
 509       # When locked, progress fields cannot be updated by the wrong
 510       # dispatcher, even though it has admin privileges.
 511       permitted = permitted - progress_attrs
 512     end
 513     check_update_whitelist permitted
 514   end
 515
 516   def validate_lock
 517     if [Locked, Running].include? self.state
 518       # If the Container was already locked, locked_by_uuid must not
 519       # changes. Otherwise, the current auth gets the lock.
 520       need_lock = locked_by_uuid_was || current_api_client_authorization.andand.uuid
 521     else
 522       need_lock = nil
 523     end
 524
 525     # The caller can provide a new value for locked_by_uuid, but only
 526     # if it's exactly what we expect. This allows a caller to perform
 527     # an update like {"state":"Unlocked","locked_by_uuid":null}.
 528     if self.locked_by_uuid_changed?
 529       if self.locked_by_uuid != need_lock
 530         return errors.add :locked_by_uuid, "can only change to #{need_lock}"
 531       end
 532     end
 533     self.locked_by_uuid = need_lock
 534   end
 535
 536   def validate_output
 537     # Output must exist and be readable by the current user.  This is so
 538     # that a container cannot "claim" a collection that it doesn't otherwise
 539     # have access to just by setting the output field to the collection PDH.
 540     if output_changed?
 541       c = Collection.
 542             readable_by(current_user, {include_trash: true}).
 543             where(portable_data_hash: self.output).
 544             first
 545       if !c
 546         errors.add :output, "collection must exist and be readable by current user."
 547       end
 548     end
 549   end
 550
 551   def update_cr_logs
 552     # If self.final?, this update is superfluous: the final log/output
 553     # update will be done when handle_completed calls finalize! on
 554     # each requesting CR.
 555     return if self.final? || !self.log_changed?
 556     leave_modified_by_user_alone do
 557       ContainerRequest.where(container_uuid: self.uuid).each do |cr|
 558         cr.update_collections(container: self, collections: ['log'])
 559         cr.save!
 560       end
 561     end
 562   end
 563
 564   def assign_auth
 565     if self.auth_uuid_changed?
 566          return errors.add :auth_uuid, 'is readonly'
 567     end
 568     if not [Locked, Running].include? self.state
 569       # don't need one
 570       self.auth.andand.update_attributes(expires_at: db_current_time)
 571       self.auth = nil
 572       return
 573     elsif self.auth
 574       # already have one
 575       return
 576     end
 577     if self.runtime_token.nil?
 578       if self.runtime_user_uuid.nil?
 579         # legacy behavior, we don't have a runtime_user_uuid so get
 580         # the user from the highest priority container request, needed
 581         # when performing an upgrade and there are queued containers,
 582         # and some tests.
 583         cr = ContainerRequest.
 584                where('container_uuid=? and priority>0', self.uuid).
 585                order('priority desc').
 586                first
 587         if !cr
 588           return errors.add :auth_uuid, "cannot be assigned because priority <= 0"
 589         end
 590         self.runtime_user_uuid = cr.modified_by_user_uuid
 591         self.runtime_auth_scopes = ["all"]
 592       end
 593
 594       # generate a new token
 595       self.auth = ApiClientAuthorization.
 596                     create!(user_id: User.find_by_uuid(self.runtime_user_uuid).id,
 597                             api_client_id: 0,
 598                             scopes: self.runtime_auth_scopes)
 599     end
 600   end
 601
 602   def sort_serialized_attrs
 603     if self.environment_changed?
 604       self.environment = self.class.deep_sort_hash(self.environment)
 605     end
 606     if self.mounts_changed?
 607       self.mounts = self.class.deep_sort_hash(self.mounts)
 608     end
 609     if self.runtime_constraints_changed?
 610       self.runtime_constraints = self.class.deep_sort_hash(self.runtime_constraints)
 611     end
 612     if self.scheduling_parameters_changed?
 613       self.scheduling_parameters = self.class.deep_sort_hash(self.scheduling_parameters)
 614     end
 615     if self.runtime_auth_scopes_changed?
 616       self.runtime_auth_scopes = self.runtime_auth_scopes.sort
 617     end
 618   end
 619
 620   def update_secret_mounts_md5
 621     if self.secret_mounts_changed?
 622       self.secret_mounts_md5 = Digest::MD5.hexdigest(
 623         SafeJSON.dump(self.class.deep_sort_hash(self.secret_mounts)))
 624     end
 625   end
 626
 627   def scrub_secrets
 628     # this runs after update_secret_mounts_md5, so the
 629     # secret_mounts_md5 will still reflect the secrets that are being
 630     # scrubbed here.
 631     if self.state_changed? && self.final?
 632       self.secret_mounts = {}
 633       self.runtime_token = nil
 634     end
 635   end
 636
 637   def clear_runtime_status_when_queued
 638     # Avoid leaking status messages between different dispatch attempts
 639     if self.state_was == Locked && self.state == Queued
 640       self.runtime_status = {}
 641     end
 642   end
 643
 644   def handle_completed
 645     # This container is finished so finalize any associated container requests
 646     # that are associated with this container.
 647     if self.state_changed? and self.final?
 648       act_as_system_user do
 649
 650         if self.state == Cancelled
 651           retryable_requests = ContainerRequest.where("container_uuid = ? and priority > 0 and state = 'Committed' and container_count < container_count_max", uuid)
 652         else
 653           retryable_requests = []
 654         end
 655
 656         if retryable_requests.any?
 657           c_attrs = {
 658             command: self.command,
 659             cwd: self.cwd,
 660             environment: self.environment,
 661             output_path: self.output_path,
 662             container_image: self.container_image,
 663             mounts: self.mounts,
 664             runtime_constraints: self.runtime_constraints,
 665             scheduling_parameters: self.scheduling_parameters,
 666             secret_mounts: self.secret_mounts_was,
 667             runtime_token: self.runtime_token_was,
 668             runtime_user_uuid: self.runtime_user_uuid,
 669             runtime_auth_scopes: self.runtime_auth_scopes
 670           }
 671           c = Container.create! c_attrs
 672           retryable_requests.each do |cr|
 673             cr.with_lock do
 674               leave_modified_by_user_alone do
 675                 # Use row locking because this increments container_count
 676                 cr.container_uuid = c.uuid
 677                 cr.save!
 678               end
 679             end
 680           end
 681         end
 682
 683         # Notify container requests associated with this container
 684         ContainerRequest.where(container_uuid: uuid,
 685                                state: ContainerRequest::Committed).each do |cr|
 686           leave_modified_by_user_alone do
 687             cr.finalize!
 688           end
 689         end
 690
 691         # Cancel outstanding container requests made by this container.
 692         ContainerRequest.
 693           includes(:container).
 694           where(requesting_container_uuid: uuid,
 695                 state: ContainerRequest::Committed).each do |cr|
 696           leave_modified_by_user_alone do
 697             cr.update_attributes!(priority: 0)
 698             cr.container.reload
 699             if cr.container.state == Container::Queued || cr.container.state == Container::Locked
 700               # If the child container hasn't started yet, finalize the
 701               # child CR now instead of leaving it "on hold", i.e.,
 702               # Queued with priority 0.  (OTOH, if the child is already
 703               # running, leave it alone so it can get cancelled the
 704               # usual way, get a copy of the log collection, etc.)
 705               cr.update_attributes!(state: ContainerRequest::Final)
 706             end
 707           end
 708         end
 709       end
 710     end
 711   end
 712 end