Update diff_max_patch_bytes from 100kb -> 200kb

changelogs/unreleased/kerrizor-increase-default-diff_max_patch_bytes.yml

+---
+title: Update diff_max_patch_bytes from 100kb -> 200kb
+merge_request: 46276
+author:
+type: changed

db/migrate/20201027211138_increase_default_diff_max_patch_bytes.rb

+# frozen_string_literal: true
+
+class IncreaseDefaultDiffMaxPatchBytes < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    change_column_default(:application_settings, :diff_max_patch_bytes, from: 102400, to: 204800)
+  end
+end

db/migrate/20201028204306_migrate_default_diff_max_patch_bytes_to_minimum_200kb.rb

+# frozen_string_literal: true
+
+class MigrateDefaultDiffMaxPatchBytesToMinimum200kb < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+  MAX_SIZE = 200.kilobytes
+
+  class ApplicationSetting < ActiveRecord::Base
+    self.table_name = 'application_settings'
+  end
+
+  def up
+    table = ApplicationSetting.arel_table
+    ApplicationSetting.where(table[:diff_max_patch_bytes].lt(MAX_SIZE)).update_all(diff_max_patch_bytes: MAX_SIZE)
+  end
+
+  def down
+    table = ApplicationSetting.arel_table
+    ApplicationSetting.where(table[:diff_max_patch_bytes].eq(MAX_SIZE)).update_all(diff_max_patch_bytes: 100.kilobytes)
+  end
+end

db/schema_migrations/20201027211138

+402e9a6e92802888ba01ee216850ab5b0fe9997a84415c9ffe8d5d37a9823220
\ No newline at end of file

db/schema_migrations/20201028204306

+ec5bab20a1b591b77b48b85dc0b871e88a41891d256201b7d8eb86195ef1c4ad
\ No newline at end of file

db/structure.sql

@@ -9171,7 +9171,7 @@ CREATE TABLE application_settings (
     custom_project_templates_group_id integer,
     usage_stats_set_by_user_id integer,
     receive_max_input_size integer,
-    diff_max_patch_bytes integer DEFAULT 102400 NOT NULL,
+    diff_max_patch_bytes integer DEFAULT 204800 NOT NULL,
     archive_builds_in_seconds integer,
     commit_email_hostname character varying,
     protected_ci_variables boolean DEFAULT true NOT NULL,

lib/gitlab/git/diff.rb

@@ -25,7 +25,7 @@ module Gitlab
       #
       # If this value ever changes, make sure to create a migration to update
       # current records, and default of `ApplicationSettings#diff_max_patch_bytes`.
-      DEFAULT_MAX_PATCH_BYTES = 100.kilobytes
+      DEFAULT_MAX_PATCH_BYTES = 200.kilobytes
 
       # This is a limitation applied on the source (Gitaly), therefore we don't allow
       # persisting limits over that.

spec/features/expand_collapse_diffs_spec.rb

@@ -8,6 +8,8 @@ RSpec.describe 'Expand and collapse diffs', :js do
 
   before do
     stub_feature_flags(increased_diff_limits: false)
+    allow(Gitlab::CurrentSettings).to receive(:diff_max_patch_bytes).and_return(100.kilobytes)
+
     sign_in(create(:admin))
 
     # Ensure that undiffable.md is in .gitattributes

spec/features/merge_request/user_expands_diff_spec.rb

@@ -8,6 +8,8 @@ RSpec.describe 'User expands diff', :js do
 
   before do
     stub_feature_flags(increased_diff_limits: false)
+    allow(Gitlab::CurrentSettings).to receive(:diff_max_patch_bytes).and_return(100.kilobytes)
+
     visit(diffs_project_merge_request_path(project, merge_request))
 
     wait_for_requests

spec/lib/gitlab/gitaly_client/commit_service_spec.rb

@@ -32,7 +32,7 @@ RSpec.describe Gitlab::GitalyClient::CommitService do
           safe_max_files: 100,
           safe_max_lines: 5000,
           safe_max_bytes: 512000,
-          max_patch_bytes: 102400
+          max_patch_bytes: 204800
         )
 
         expect_any_instance_of(Gitaly::DiffService::Stub).to receive(:commit_diff).with(request, kind_of(Hash))
@@ -57,7 +57,7 @@ RSpec.describe Gitlab::GitalyClient::CommitService do
           safe_max_files: 100,
           safe_max_lines: 5000,
           safe_max_bytes: 512000,
-          max_patch_bytes: 102400
+          max_patch_bytes: 204800
         )
 
         expect_any_instance_of(Gitaly::DiffService::Stub).to receive(:commit_diff).with(request, kind_of(Hash))

spec/requests/api/settings_spec.rb

@@ -105,7 +105,7 @@ RSpec.describe API::Settings, 'Settings' do
             enforce_terms: true,
             terms: 'Hello world!',
             performance_bar_allowed_group_path: group.full_path,
-            diff_max_patch_bytes: 150_000,
+            diff_max_patch_bytes: 300_000,
             default_branch_protection: ::Gitlab::Access::PROTECTION_DEV_CAN_MERGE,
             local_markdown_version: 3,
             allow_local_requests_from_web_hooks_and_services: true,
@@ -148,7 +148,7 @@ RSpec.describe API::Settings, 'Settings' do
         expect(json_response['enforce_terms']).to be(true)
         expect(json_response['terms']).to eq('Hello world!')
         expect(json_response['performance_bar_allowed_group_id']).to eq(group.id)
-        expect(json_response['diff_max_patch_bytes']).to eq(150_000)
+        expect(json_response['diff_max_patch_bytes']).to eq(300_000)
         expect(json_response['default_branch_protection']).to eq(Gitlab::Access::PROTECTION_DEV_CAN_MERGE)
         expect(json_response['local_markdown_version']).to eq(3)
         expect(json_response['allow_local_requests_from_web_hooks_and_services']).to eq(true)