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