Merge branch 'frozen-string-app-workers' into 'master'

Enable frozen string literals for app/workers/*.rb

See merge request gitlab-org/gitlab-ce!19944

87 files changed, 183 insertions, 9 deletions

diff --git a/app/workers/admin_email_worker.rb b/app/workers/admin_email_worker.rb
index 044e470141e..06324575ffc 100644
--- a/app/workers/admin_email_worker.rb
+++ b/app/workers/admin_email_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AdminEmailWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/archive_trace_worker.rb b/app/workers/archive_trace_worker.rb
index dea7425ad88..9169f21af2a 100644
--- a/app/workers/archive_trace_worker.rb
+++ b/app/workers/archive_trace_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArchiveTraceWorker
   include ApplicationWorker
   include PipelineBackgroundQueue
diff --git a/app/workers/authorized_projects_worker.rb b/app/workers/authorized_projects_worker.rb
index 8fe3619f6ee..dd62bb0f33d 100644
--- a/app/workers/authorized_projects_worker.rb
+++ b/app/workers/authorized_projects_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AuthorizedProjectsWorker
   include ApplicationWorker
   prepend WaitableWorker
diff --git a/app/workers/background_migration_worker.rb b/app/workers/background_migration_worker.rb
index 376703f6319..eaec7d48f35 100644
--- a/app/workers/background_migration_worker.rb
+++ b/app/workers/background_migration_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BackgroundMigrationWorker
   include ApplicationWorker
 
diff --git a/app/workers/build_coverage_worker.rb b/app/workers/build_coverage_worker.rb
index 62b212c79be..53d77dc4524 100644
--- a/app/workers/build_coverage_worker.rb
+++ b/app/workers/build_coverage_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildCoverageWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/build_finished_worker.rb b/app/workers/build_finished_worker.rb
index 46f1ac09915..9dc2c7f3601 100644
--- a/app/workers/build_finished_worker.rb
+++ b/app/workers/build_finished_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildFinishedWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/build_hooks_worker.rb b/app/workers/build_hooks_worker.rb
index cbfca8c342c..f1f71dc589c 100644
--- a/app/workers/build_hooks_worker.rb
+++ b/app/workers/build_hooks_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildHooksWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/build_queue_worker.rb b/app/workers/build_queue_worker.rb
index e4f4e6c1d9e..1b3f1fd3c2a 100644
--- a/app/workers/build_queue_worker.rb
+++ b/app/workers/build_queue_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildQueueWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/build_success_worker.rb b/app/workers/build_success_worker.rb
index 4b9097bc5e4..e1c1cc24a94 100644
--- a/app/workers/build_success_worker.rb
+++ b/app/workers/build_success_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildSuccessWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/build_trace_sections_worker.rb b/app/workers/build_trace_sections_worker.rb
index c0f5c144e10..f4114b3353c 100644
--- a/app/workers/build_trace_sections_worker.rb
+++ b/app/workers/build_trace_sections_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BuildTraceSectionsWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/cluster_install_app_worker.rb b/app/workers/cluster_install_app_worker.rb
index f771cb4939f..32e2ea7996c 100644
--- a/app/workers/cluster_install_app_worker.rb
+++ b/app/workers/cluster_install_app_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClusterInstallAppWorker
   include ApplicationWorker
   include ClusterQueue
diff --git a/app/workers/cluster_provision_worker.rb b/app/workers/cluster_provision_worker.rb
index 1ab4de3b647..59de7903c1c 100644
--- a/app/workers/cluster_provision_worker.rb
+++ b/app/workers/cluster_provision_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClusterProvisionWorker
   include ApplicationWorker
   include ClusterQueue
diff --git a/app/workers/cluster_wait_for_app_installation_worker.rb b/app/workers/cluster_wait_for_app_installation_worker.rb
index d564d5e48bf..e8d7e52f70f 100644
--- a/app/workers/cluster_wait_for_app_installation_worker.rb
+++ b/app/workers/cluster_wait_for_app_installation_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClusterWaitForAppInstallationWorker
   include ApplicationWorker
   include ClusterQueue
diff --git a/app/workers/cluster_wait_for_ingress_ip_address_worker.rb b/app/workers/cluster_wait_for_ingress_ip_address_worker.rb
index 8ba5951750c..6865384df44 100644
--- a/app/workers/cluster_wait_for_ingress_ip_address_worker.rb
+++ b/app/workers/cluster_wait_for_ingress_ip_address_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ClusterWaitForIngressIpAddressWorker
   include ApplicationWorker
   include ClusterQueue
diff --git a/app/workers/create_gpg_signature_worker.rb b/app/workers/create_gpg_signature_worker.rb
index f371731f68c..a2da1bda11f 100644
--- a/app/workers/create_gpg_signature_worker.rb
+++ b/app/workers/create_gpg_signature_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateGpgSignatureWorker
   include ApplicationWorker
 
diff --git a/app/workers/create_note_diff_file_worker.rb b/app/workers/create_note_diff_file_worker.rb
index 624b638a24e..0850250f7e3 100644
--- a/app/workers/create_note_diff_file_worker.rb
+++ b/app/workers/create_note_diff_file_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateNoteDiffFileWorker
   include ApplicationWorker
 
diff --git a/app/workers/create_pipeline_worker.rb b/app/workers/create_pipeline_worker.rb
index c3ac35e54f5..037b4a57d4b 100644
--- a/app/workers/create_pipeline_worker.rb
+++ b/app/workers/create_pipeline_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreatePipelineWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/delete_merged_branches_worker.rb b/app/workers/delete_merged_branches_worker.rb
index 07cd1f02fb5..017d7fd1cb0 100644
--- a/app/workers/delete_merged_branches_worker.rb
+++ b/app/workers/delete_merged_branches_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DeleteMergedBranchesWorker
   include ApplicationWorker
 
diff --git a/app/workers/delete_user_worker.rb b/app/workers/delete_user_worker.rb
index 6c431b02979..4d0295f8d2e 100644
--- a/app/workers/delete_user_worker.rb
+++ b/app/workers/delete_user_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DeleteUserWorker
   include ApplicationWorker
 
diff --git a/app/workers/email_receiver_worker.rb b/app/workers/email_receiver_worker.rb
index dd8a6cbbef1..f9f0efb302a 100644
--- a/app/workers/email_receiver_worker.rb
+++ b/app/workers/email_receiver_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class EmailReceiverWorker
   include ApplicationWorker
 
diff --git a/app/workers/emails_on_push_worker.rb b/app/workers/emails_on_push_worker.rb
index 2a4d65b5cb3..8d0cfc73ccd 100644
--- a/app/workers/emails_on_push_worker.rb
+++ b/app/workers/emails_on_push_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class EmailsOnPushWorker
   include ApplicationWorker
 
diff --git a/app/workers/expire_build_artifacts_worker.rb b/app/workers/expire_build_artifacts_worker.rb
index 87e5dca01fd..5d3a9a39b93 100644
--- a/app/workers/expire_build_artifacts_worker.rb
+++ b/app/workers/expire_build_artifacts_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExpireBuildArtifactsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/expire_build_instance_artifacts_worker.rb b/app/workers/expire_build_instance_artifacts_worker.rb
index 234b4357cf7..3b57ecb36e3 100644
--- a/app/workers/expire_build_instance_artifacts_worker.rb
+++ b/app/workers/expire_build_instance_artifacts_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExpireBuildInstanceArtifactsWorker
   include ApplicationWorker
 
diff --git a/app/workers/expire_job_cache_worker.rb b/app/workers/expire_job_cache_worker.rb
index 7217364a9f2..14a57b90114 100644
--- a/app/workers/expire_job_cache_worker.rb
+++ b/app/workers/expire_job_cache_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExpireJobCacheWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/expire_pipeline_cache_worker.rb b/app/workers/expire_pipeline_cache_worker.rb
index db73d37868a..992fc63c451 100644
--- a/app/workers/expire_pipeline_cache_worker.rb
+++ b/app/workers/expire_pipeline_cache_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExpirePipelineCacheWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/git_garbage_collect_worker.rb b/app/workers/git_garbage_collect_worker.rb
index ae5c5fac834..fd49bc18161 100644
--- a/app/workers/git_garbage_collect_worker.rb
+++ b/app/workers/git_garbage_collect_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GitGarbageCollectWorker
   include ApplicationWorker
 
diff --git a/app/workers/gitlab_shell_worker.rb b/app/workers/gitlab_shell_worker.rb
index a0028e41332..0e4d40acc5c 100644
--- a/app/workers/gitlab_shell_worker.rb
+++ b/app/workers/gitlab_shell_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GitlabShellWorker
   include ApplicationWorker
   include Gitlab::ShellAdapter
diff --git a/app/workers/gitlab_usage_ping_worker.rb b/app/workers/gitlab_usage_ping_worker.rb
index 6dd281b1147..b75e724ca98 100644
--- a/app/workers/gitlab_usage_ping_worker.rb
+++ b/app/workers/gitlab_usage_ping_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GitlabUsagePingWorker
   LEASE_TIMEOUT = 86400
 
diff --git a/app/workers/group_destroy_worker.rb b/app/workers/group_destroy_worker.rb
index 509bd09dc2e..b4a3ddcae51 100644
--- a/app/workers/group_destroy_worker.rb
+++ b/app/workers/group_destroy_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GroupDestroyWorker
   include ApplicationWorker
   include ExceptionBacktrace
diff --git a/app/workers/import_export_project_cleanup_worker.rb b/app/workers/import_export_project_cleanup_worker.rb
index 9788c8df3a3..da3debdeede 100644
--- a/app/workers/import_export_project_cleanup_worker.rb
+++ b/app/workers/import_export_project_cleanup_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ImportExportProjectCleanupWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/invalid_gpg_signature_update_worker.rb b/app/workers/invalid_gpg_signature_update_worker.rb
index 6774ab307c6..4724ab7ad98 100644
--- a/app/workers/invalid_gpg_signature_update_worker.rb
+++ b/app/workers/invalid_gpg_signature_update_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class InvalidGpgSignatureUpdateWorker
   include ApplicationWorker
 
diff --git a/app/workers/irker_worker.rb b/app/workers/irker_worker.rb
index 9ae5456be4c..29631c6b7ac 100644
--- a/app/workers/irker_worker.rb
+++ b/app/workers/irker_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'json'
 require 'socket'
 
@@ -69,8 +71,8 @@ class IrkerWorker
     newbranch = "#{Gitlab.config.gitlab.url}/#{repo_path}/branches"
     newbranch = "\x0302\x1f#{newbranch}\x0f" if @colors
 
-    privmsg = "[#{repo_name}] #{committer} has created a new branch "
-    privmsg += "#{branch}: #{newbranch}"
+    privmsg = "[#{repo_name}] #{committer} has created a new branch " \
+              "#{branch}: #{newbranch}"
     sendtoirker privmsg
   end
 
@@ -112,9 +114,7 @@ class IrkerWorker
     url = compare_url data, project.full_path
     commits = colorize_commits data['total_commits_count']
 
-    new_commits = 'new commit'
-    new_commits += 's' if data['total_commits_count'] > 1
-
+    new_commits = 'new commit'.pluralize(data['total_commits_count'])
     sendtoirker "[#{repo}] #{committer} pushed #{commits} #{new_commits} " \
                 "to #{branch}: #{url}"
   end
@@ -122,8 +122,8 @@ class IrkerWorker
   def compare_url(data, repo_path)
     sha1 = Commit.truncate_sha(data['before'])
     sha2 = Commit.truncate_sha(data['after'])
-    compare_url = "#{Gitlab.config.gitlab.url}/#{repo_path}/compare"
-    compare_url += "/#{sha1}...#{sha2}"
+    compare_url = "#{Gitlab.config.gitlab.url}/#{repo_path}/compare" \
+                  "/#{sha1}...#{sha2}"
     colorize_url compare_url
   end
 
@@ -144,8 +144,7 @@ class IrkerWorker
   def files_count(commit)
     diff_size = commit.raw_deltas.size
 
-    files = "#{diff_size} file"
-    files += 's' if diff_size > 1
+    files = "#{diff_size} file".pluralize(diff_size)
     files
   end
 
diff --git a/app/workers/issue_due_scheduler_worker.rb b/app/workers/issue_due_scheduler_worker.rb
index 16ab5d069e0..c04a2d75e0b 100644
--- a/app/workers/issue_due_scheduler_worker.rb
+++ b/app/workers/issue_due_scheduler_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IssueDueSchedulerWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/merge_worker.rb b/app/workers/merge_worker.rb
index ba832fe30c6..ee864b733cd 100644
--- a/app/workers/merge_worker.rb
+++ b/app/workers/merge_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MergeWorker
   include ApplicationWorker
 
diff --git a/app/workers/namespaceless_project_destroy_worker.rb b/app/workers/namespaceless_project_destroy_worker.rb
index adb25c2a170..d9df42c9e17 100644
--- a/app/workers/namespaceless_project_destroy_worker.rb
+++ b/app/workers/namespaceless_project_destroy_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Worker to destroy projects that do not have a namespace
 #
 # It destroys everything it can without having the info about the namespace it
diff --git a/app/workers/new_issue_worker.rb b/app/workers/new_issue_worker.rb
index 3bc030f9c62..85b53973f56 100644
--- a/app/workers/new_issue_worker.rb
+++ b/app/workers/new_issue_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NewIssueWorker
   include ApplicationWorker
   include NewIssuable
diff --git a/app/workers/new_merge_request_worker.rb b/app/workers/new_merge_request_worker.rb
index bda2a0ab59d..5d8b8904502 100644
--- a/app/workers/new_merge_request_worker.rb
+++ b/app/workers/new_merge_request_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NewMergeRequestWorker
   include ApplicationWorker
   include NewIssuable
diff --git a/app/workers/new_note_worker.rb b/app/workers/new_note_worker.rb
index 67c54fbf10e..74f34dcf9aa 100644
--- a/app/workers/new_note_worker.rb
+++ b/app/workers/new_note_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NewNoteWorker
   include ApplicationWorker
 
diff --git a/app/workers/object_storage_upload_worker.rb b/app/workers/object_storage_upload_worker.rb
index 5c80f34069c..f17980a83d8 100644
--- a/app/workers/object_storage_upload_worker.rb
+++ b/app/workers/object_storage_upload_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # @Deprecated - remove once the `object_storage_upload` queue is empty
 # The queue has been renamed `object_storage:object_storage_background_upload`
 #
diff --git a/app/workers/pages_domain_verification_cron_worker.rb b/app/workers/pages_domain_verification_cron_worker.rb
index a3ff4bd2101..92d62a15aee 100644
--- a/app/workers/pages_domain_verification_cron_worker.rb
+++ b/app/workers/pages_domain_verification_cron_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PagesDomainVerificationCronWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/pages_domain_verification_worker.rb b/app/workers/pages_domain_verification_worker.rb
index 2e93489113c..4610b688189 100644
--- a/app/workers/pages_domain_verification_worker.rb
+++ b/app/workers/pages_domain_verification_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PagesDomainVerificationWorker
   include ApplicationWorker
 
diff --git a/app/workers/pages_worker.rb b/app/workers/pages_worker.rb
index 66a0ff83bef..13a6576a301 100644
--- a/app/workers/pages_worker.rb
+++ b/app/workers/pages_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PagesWorker
   include ApplicationWorker
 
diff --git a/app/workers/pipeline_hooks_worker.rb b/app/workers/pipeline_hooks_worker.rb
index c94918ff4ee..58023e0af1b 100644
--- a/app/workers/pipeline_hooks_worker.rb
+++ b/app/workers/pipeline_hooks_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineHooksWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/pipeline_metrics_worker.rb b/app/workers/pipeline_metrics_worker.rb
index d46d1f122fc..a97019b100a 100644
--- a/app/workers/pipeline_metrics_worker.rb
+++ b/app/workers/pipeline_metrics_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineMetricsWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/pipeline_notification_worker.rb b/app/workers/pipeline_notification_worker.rb
index a9a1168a6e3..3a8846b3747 100644
--- a/app/workers/pipeline_notification_worker.rb
+++ b/app/workers/pipeline_notification_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineNotificationWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/pipeline_process_worker.rb b/app/workers/pipeline_process_worker.rb
index 24424b3f472..83744c5338a 100644
--- a/app/workers/pipeline_process_worker.rb
+++ b/app/workers/pipeline_process_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineProcessWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/pipeline_schedule_worker.rb b/app/workers/pipeline_schedule_worker.rb
index c49758878a4..a1815757735 100644
--- a/app/workers/pipeline_schedule_worker.rb
+++ b/app/workers/pipeline_schedule_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineScheduleWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/pipeline_success_worker.rb b/app/workers/pipeline_success_worker.rb
index 2ab0739a17f..68e9af6a619 100644
--- a/app/workers/pipeline_success_worker.rb
+++ b/app/workers/pipeline_success_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineSuccessWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/pipeline_update_worker.rb b/app/workers/pipeline_update_worker.rb
index fc9da2d45b1..c33468c1f14 100644
--- a/app/workers/pipeline_update_worker.rb
+++ b/app/workers/pipeline_update_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PipelineUpdateWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/plugin_worker.rb b/app/workers/plugin_worker.rb
index bfcc683d99a..c293e28be4a 100644
--- a/app/workers/plugin_worker.rb
+++ b/app/workers/plugin_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PluginWorker
   include ApplicationWorker
 
diff --git a/app/workers/post_receive.rb b/app/workers/post_receive.rb
index f88b3fdbfb1..09a594cdb4e 100644
--- a/app/workers/post_receive.rb
+++ b/app/workers/post_receive.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostReceive
   include ApplicationWorker
 
diff --git a/app/workers/process_commit_worker.rb b/app/workers/process_commit_worker.rb
index 201e7f332b4..ed39b4a1ea8 100644
--- a/app/workers/process_commit_worker.rb
+++ b/app/workers/process_commit_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Worker for processing individiual commit messages pushed to a repository.
 #
 # Jobs for this worker are scheduled for every commit that is being pushed. As a
diff --git a/app/workers/project_cache_worker.rb b/app/workers/project_cache_worker.rb
index a993b4b2680..b0e1d8837d9 100644
--- a/app/workers/project_cache_worker.rb
+++ b/app/workers/project_cache_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Worker for updating any project specific caches.
 class ProjectCacheWorker
   include ApplicationWorker
diff --git a/app/workers/project_destroy_worker.rb b/app/workers/project_destroy_worker.rb
index 1ba854ca4cb..4447e867240 100644
--- a/app/workers/project_destroy_worker.rb
+++ b/app/workers/project_destroy_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProjectDestroyWorker
   include ApplicationWorker
   include ExceptionBacktrace
diff --git a/app/workers/project_export_worker.rb b/app/workers/project_export_worker.rb
index c3d84bb0b93..ed9da39c7c3 100644
--- a/app/workers/project_export_worker.rb
+++ b/app/workers/project_export_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProjectExportWorker
   include ApplicationWorker
   include ExceptionBacktrace
diff --git a/app/workers/project_migrate_hashed_storage_worker.rb b/app/workers/project_migrate_hashed_storage_worker.rb
index d01eb744e5d..9e4d66250a4 100644
--- a/app/workers/project_migrate_hashed_storage_worker.rb
+++ b/app/workers/project_migrate_hashed_storage_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProjectMigrateHashedStorageWorker
   include ApplicationWorker
 
diff --git a/app/workers/project_service_worker.rb b/app/workers/project_service_worker.rb
index 75c4b8b3663..a0bc9288cf0 100644
--- a/app/workers/project_service_worker.rb
+++ b/app/workers/project_service_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProjectServiceWorker
   include ApplicationWorker
 
diff --git a/app/workers/propagate_service_template_worker.rb b/app/workers/propagate_service_template_worker.rb
index 635a97c99af..c9da1cae255 100644
--- a/app/workers/propagate_service_template_worker.rb
+++ b/app/workers/propagate_service_template_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Worker for updating any project specific caches.
 class PropagateServiceTemplateWorker
   include ApplicationWorker
diff --git a/app/workers/prune_old_events_worker.rb b/app/workers/prune_old_events_worker.rb
index 5ff62ab1369..c1d05ebbcfd 100644
--- a/app/workers/prune_old_events_worker.rb
+++ b/app/workers/prune_old_events_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PruneOldEventsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/reactive_caching_worker.rb b/app/workers/reactive_caching_worker.rb
index ef3ddb9024b..9b331f15dc5 100644
--- a/app/workers/reactive_caching_worker.rb
+++ b/app/workers/reactive_caching_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ReactiveCachingWorker
   include ApplicationWorker
 
diff --git a/app/workers/rebase_worker.rb b/app/workers/rebase_worker.rb
index 090987778a2..a6baebc1443 100644
--- a/app/workers/rebase_worker.rb
+++ b/app/workers/rebase_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RebaseWorker
   include ApplicationWorker
 
diff --git a/app/workers/remove_expired_group_links_worker.rb b/app/workers/remove_expired_group_links_worker.rb
index 7e64c3070a8..6b8b972a440 100644
--- a/app/workers/remove_expired_group_links_worker.rb
+++ b/app/workers/remove_expired_group_links_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveExpiredGroupLinksWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/remove_expired_members_worker.rb b/app/workers/remove_expired_members_worker.rb
index 68960f72bf6..41913900571 100644
--- a/app/workers/remove_expired_members_worker.rb
+++ b/app/workers/remove_expired_members_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveExpiredMembersWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/remove_old_web_hook_logs_worker.rb b/app/workers/remove_old_web_hook_logs_worker.rb
index 87fed42d7ce..17140ac4450 100644
--- a/app/workers/remove_old_web_hook_logs_worker.rb
+++ b/app/workers/remove_old_web_hook_logs_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveOldWebHookLogsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/remove_unreferenced_lfs_objects_worker.rb b/app/workers/remove_unreferenced_lfs_objects_worker.rb
index 8daf079fc31..95e7a9f537f 100644
--- a/app/workers/remove_unreferenced_lfs_objects_worker.rb
+++ b/app/workers/remove_unreferenced_lfs_objects_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RemoveUnreferencedLfsObjectsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/repository_archive_cache_worker.rb b/app/workers/repository_archive_cache_worker.rb
index 86a258cf94f..c1dff8ced90 100644
--- a/app/workers/repository_archive_cache_worker.rb
+++ b/app/workers/repository_archive_cache_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RepositoryArchiveCacheWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/repository_fork_worker.rb b/app/workers/repository_fork_worker.rb
index dbb215f1964..5ef9b744db3 100644
--- a/app/workers/repository_fork_worker.rb
+++ b/app/workers/repository_fork_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RepositoryForkWorker
   include ApplicationWorker
   include Gitlab::ShellAdapter
diff --git a/app/workers/repository_import_worker.rb b/app/workers/repository_import_worker.rb
index d79b5ee5346..25fec542ac7 100644
--- a/app/workers/repository_import_worker.rb
+++ b/app/workers/repository_import_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RepositoryImportWorker
   include ApplicationWorker
   include ExceptionBacktrace
diff --git a/app/workers/repository_remove_remote_worker.rb b/app/workers/repository_remove_remote_worker.rb
index 1c19b604b77..a85e9fa9394 100644
--- a/app/workers/repository_remove_remote_worker.rb
+++ b/app/workers/repository_remove_remote_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RepositoryRemoveRemoteWorker
   include ApplicationWorker
   include ExclusiveLeaseGuard
diff --git a/app/workers/repository_update_remote_mirror_worker.rb b/app/workers/repository_update_remote_mirror_worker.rb
index bb963979e88..9d4e67deb9c 100644
--- a/app/workers/repository_update_remote_mirror_worker.rb
+++ b/app/workers/repository_update_remote_mirror_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RepositoryUpdateRemoteMirrorWorker
   UpdateAlreadyInProgressError = Class.new(StandardError)
   UpdateError = Class.new(StandardError)
diff --git a/app/workers/requests_profiles_worker.rb b/app/workers/requests_profiles_worker.rb
index 55c236e9e9d..ae022d43e29 100644
--- a/app/workers/requests_profiles_worker.rb
+++ b/app/workers/requests_profiles_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RequestsProfilesWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/run_pipeline_schedule_worker.rb b/app/workers/run_pipeline_schedule_worker.rb
index 8f5138fc873..1f6cb18c812 100644
--- a/app/workers/run_pipeline_schedule_worker.rb
+++ b/app/workers/run_pipeline_schedule_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RunPipelineScheduleWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/schedule_update_user_activity_worker.rb b/app/workers/schedule_update_user_activity_worker.rb
index d9376577597..ff42fb8f0e5 100644
--- a/app/workers/schedule_update_user_activity_worker.rb
+++ b/app/workers/schedule_update_user_activity_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ScheduleUpdateUserActivityWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/stage_update_worker.rb b/app/workers/stage_update_worker.rb
index e4b683fca33..ec8c8e3689f 100644
--- a/app/workers/stage_update_worker.rb
+++ b/app/workers/stage_update_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StageUpdateWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/storage_migrator_worker.rb b/app/workers/storage_migrator_worker.rb
index 0aff0c4c7c6..fa76fbac55c 100644
--- a/app/workers/storage_migrator_worker.rb
+++ b/app/workers/storage_migrator_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StorageMigratorWorker
   include ApplicationWorker
 
diff --git a/app/workers/stuck_ci_jobs_worker.rb b/app/workers/stuck_ci_jobs_worker.rb
index 7ebf69bdc39..c78b7fac589 100644
--- a/app/workers/stuck_ci_jobs_worker.rb
+++ b/app/workers/stuck_ci_jobs_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StuckCiJobsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/stuck_import_jobs_worker.rb b/app/workers/stuck_import_jobs_worker.rb
index 6fdd7592e74..79ce06dd66e 100644
--- a/app/workers/stuck_import_jobs_worker.rb
+++ b/app/workers/stuck_import_jobs_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StuckImportJobsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/stuck_merge_jobs_worker.rb b/app/workers/stuck_merge_jobs_worker.rb
index 16394293c79..b0a62f76e94 100644
--- a/app/workers/stuck_merge_jobs_worker.rb
+++ b/app/workers/stuck_merge_jobs_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StuckMergeJobsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/system_hook_push_worker.rb b/app/workers/system_hook_push_worker.rb
index ceeaaf8d189..15e369ebcfb 100644
--- a/app/workers/system_hook_push_worker.rb
+++ b/app/workers/system_hook_push_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SystemHookPushWorker
   include ApplicationWorker
 
diff --git a/app/workers/trending_projects_worker.rb b/app/workers/trending_projects_worker.rb
index 7eb65452a7d..3297a1fe3d0 100644
--- a/app/workers/trending_projects_worker.rb
+++ b/app/workers/trending_projects_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TrendingProjectsWorker
   include ApplicationWorker
   include CronjobQueue
diff --git a/app/workers/update_head_pipeline_for_merge_request_worker.rb b/app/workers/update_head_pipeline_for_merge_request_worker.rb
index 76f84ff920f..0487a393566 100644
--- a/app/workers/update_head_pipeline_for_merge_request_worker.rb
+++ b/app/workers/update_head_pipeline_for_merge_request_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UpdateHeadPipelineForMergeRequestWorker
   include ApplicationWorker
   include PipelineQueue
diff --git a/app/workers/update_merge_requests_worker.rb b/app/workers/update_merge_requests_worker.rb
index 74bb9993275..742841219b3 100644
--- a/app/workers/update_merge_requests_worker.rb
+++ b/app/workers/update_merge_requests_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UpdateMergeRequestsWorker
   include ApplicationWorker
 
diff --git a/app/workers/update_user_activity_worker.rb b/app/workers/update_user_activity_worker.rb
index 27ec5cd33fb..15f01a70337 100644
--- a/app/workers/update_user_activity_worker.rb
+++ b/app/workers/update_user_activity_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UpdateUserActivityWorker
   include ApplicationWorker
 
diff --git a/app/workers/upload_checksum_worker.rb b/app/workers/upload_checksum_worker.rb
index 65d40336f18..2a0536106d7 100644
--- a/app/workers/upload_checksum_worker.rb
+++ b/app/workers/upload_checksum_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UploadChecksumWorker
   include ApplicationWorker
 
diff --git a/app/workers/wait_for_cluster_creation_worker.rb b/app/workers/wait_for_cluster_creation_worker.rb
index 19cdb279aaa..8aa1d9290fd 100644
--- a/app/workers/wait_for_cluster_creation_worker.rb
+++ b/app/workers/wait_for_cluster_creation_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WaitForClusterCreationWorker
   include ApplicationWorker
   include ClusterQueue
diff --git a/app/workers/web_hook_worker.rb b/app/workers/web_hook_worker.rb
index dfc3f33ad9d..09219a24a16 100644
--- a/app/workers/web_hook_worker.rb
+++ b/app/workers/web_hook_worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WebHookWorker
   include ApplicationWorker
 
diff --git a/changelogs/unreleased/frozen-string-app-workers.yml b/changelogs/unreleased/frozen-string-app-workers.yml
new file mode 100644
index 00000000000..48b50cc6ca4
--- /dev/null
+++ b/changelogs/unreleased/frozen-string-app-workers.yml
@@ -0,0 +1,5 @@
+---
+title: Enable frozen string in app/workers/*.rb
+merge_request: 19944
+author: gfyoung
+type: other