diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index 33277ac7c723038e051980bfd4f1bf1349567443..d6dc0c4295d26bea8c820b12f960a4644bddbc07 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -1,4 +1,6 @@
-inherit_from: .rubocop_todo.yml
+inherit_from:
+  - .rubocop_rules.yml
+  - .rubocop_todo.yml
 
 AllCops:
   TargetRubyVersion: 2.0
@@ -6,129 +8,3 @@ AllCops:
     - 'Homebrew/cask/**/*'
     - 'Homebrew/vendor/**/*'
     - 'Homebrew/test/vendor/**/*'
-
-# ruby style guide favorite
-Style/StringLiterals:
-  EnforcedStyle: double_quotes
-
-# consistency with above
-Style/StringLiteralsInInterpolation:
-  EnforcedStyle: double_quotes
-
-# percent-x is allowed for multiline
-Style/CommandLiteral:
-  EnforcedStyle: mixed
-
-# paths abound, easy escape
-Style/RegexpLiteral:
-  EnforcedStyle: slashes
-
-# too prevalent to change this now, but might be discussed/changed later
-Style/Alias:
-  EnforcedStyle: prefer_alias_method
-
-# our current conditional style is established, clear and
-# requiring users to change that now would be confusing.
-Style/ConditionalAssignment:
-  Enabled: false
-
-# no metrics for formulas
-Metrics/AbcSize:
-  Enabled: false
-Metrics/CyclomaticComplexity:
-  Enabled: false
-Metrics/MethodLength:
-  Enabled: false
-Metrics/ClassLength:
-  Enabled: false
-Metrics/PerceivedComplexity:
-  Enabled: false
-
-# we often need very long lines
-Metrics/LineLength:
-  Enabled: false
-
-# formulas have no mandatory doc
-Style/Documentation:
-  Enabled: false
-
-# favor parens-less DSL-style arguments
-Lint/AmbiguousOperator:
-  Enabled: false
-Lint/AmbiguousRegexpLiteral:
-  Enabled: false
-Lint/AssignmentInCondition:
-  Enabled: false
-Lint/ParenthesesAsGroupedExpression:
-  Enabled: false
-
-# compact style
-Style/EmptyLineBetweenDefs:
-  AllowAdjacentOneLineDefs: true
-
-# port numbers and such tech stuff
-Style/NumericLiterals:
-  Enabled: false
-
-# zero-prefixed octal literals are just too widely used (and mostly understood)
-Style/NumericLiteralPrefix:
-  EnforcedOctalStyle: zero_only
-
-# consistency and readability when faced with string interpolation
-Style/PercentLiteralDelimiters:
-  PreferredDelimiters:
-    '%':  '()'
-    '%i': '()'
-    '%q': '()'
-    '%Q': '()'
-    '%r': '{}'
-    '%s': '()'
-    '%w': '[]'
-    '%W': '[]'
-    '%x': '()'
-
-# conflicts with DSL-style path concatenation with `/`
-Style/SpaceAroundOperators:
-  Enabled: false
-
-# not a problem for typical shell users
-Style/SpecialGlobalVars:
-  Enabled: false
-
-# `system` is a special case and aligns on second argument
-Style/AlignParameters:
-  Enabled: false
-
-# counterproductive in formulas, notably within the install method
-Style/GuardClause:
-  Enabled: false
-Style/IfUnlessModifier:
-  Enabled: false
-
-# dashes in filenames are typical
-# TODO: enforce when rubocop has fixed this
-# https://github.com/bbatsov/rubocop/issues/1545
-Style/FileName:
-  Enabled: false
-
-# no percent word array, being friendly to non-ruby users
-# TODO: enforce when rubocop has fixed this
-# https://github.com/bbatsov/rubocop/issues/1543
-Style/WordArray:
-  Enabled: false
-Style/UnneededCapitalW:
-  Enabled: false
-
-# we prefer compact if-else-end/case-when-end alignment
-Lint/EndAlignment:
-  AlignWith: variable
-Style/CaseIndentation:
-  IndentWhenRelativeTo: end
-
-# we prefer Perl-style regex back references
-Style/PerlBackrefs:
-  Enabled: false
-
-# makes diffs nicer
-Style/TrailingCommaInLiteral:
-  EnforcedStyleForMultiline: comma
diff --git a/Library/.rubocop_rules.yml b/Library/.rubocop_rules.yml
new file mode 100644
index 0000000000000000000000000000000000000000..cde31093031b363b08683ae1d04b5bd006cd8ae8
--- /dev/null
+++ b/Library/.rubocop_rules.yml
@@ -0,0 +1,141 @@
+
+# ruby style guide favorite
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+# consistency with above
+Style/StringLiteralsInInterpolation:
+  EnforcedStyle: double_quotes
+
+# percent-x is allowed for multiline
+Style/CommandLiteral:
+  EnforcedStyle: mixed
+
+# paths abound, easy escape
+Style/RegexpLiteral:
+  EnforcedStyle: slashes
+
+# too prevalent to change this now, but might be discussed/changed later
+Style/Alias:
+  EnforcedStyle: prefer_alias_method
+
+# our current conditional style is established, clear and
+# requiring users to change that now would be confusing.
+Style/ConditionalAssignment:
+  Enabled: false
+
+# no metrics for formulas
+Metrics/AbcSize:
+  Enabled: false
+Metrics/CyclomaticComplexity:
+  Enabled: false
+Metrics/MethodLength:
+  Enabled: false
+Metrics/ClassLength:
+  Enabled: false
+Metrics/PerceivedComplexity:
+  Enabled: false
+
+# we often need very long lines
+Metrics/LineLength:
+  Enabled: false
+
+# formulas have no mandatory doc
+Style/Documentation:
+  Enabled: false
+
+# favor parens-less DSL-style arguments
+Lint/AmbiguousOperator:
+  Enabled: false
+Lint/AmbiguousRegexpLiteral:
+  Enabled: false
+Lint/AssignmentInCondition:
+  Enabled: false
+Lint/ParenthesesAsGroupedExpression:
+  Enabled: false
+
+# compact style
+Style/EmptyLineBetweenDefs:
+  AllowAdjacentOneLineDefs: true
+
+# port numbers and such tech stuff
+Style/NumericLiterals:
+  Enabled: false
+
+# zero-prefixed octal literals are just too widely used (and mostly understood)
+Style/NumericLiteralPrefix:
+  EnforcedOctalStyle: zero_only
+
+# consistency and readability when faced with string interpolation
+Style/PercentLiteralDelimiters:
+  PreferredDelimiters:
+    '%':  '()'
+    '%i': '()'
+    '%q': '()'
+    '%Q': '()'
+    '%r': '{}'
+    '%s': '()'
+    '%w': '[]'
+    '%W': '[]'
+    '%x': '()'
+
+# conflicts with DSL-style path concatenation with `/`
+Style/SpaceAroundOperators:
+  Enabled: false
+
+# not a problem for typical shell users
+Style/SpecialGlobalVars:
+  Enabled: false
+
+# `system` is a special case and aligns on second argument
+Style/AlignParameters:
+  Enabled: false
+
+# counterproductive in formulas, notably within the install method
+Style/GuardClause:
+  Enabled: false
+Style/IfUnlessModifier:
+  Enabled: false
+
+# dashes in filenames are typical
+# TODO: enforce when rubocop has fixed this
+# https://github.com/bbatsov/rubocop/issues/1545
+Style/FileName:
+  Enabled: false
+
+# no percent word array, being friendly to non-ruby users
+# TODO: enforce when rubocop has fixed this
+# https://github.com/bbatsov/rubocop/issues/1543
+Style/WordArray:
+  Enabled: false
+Style/UnneededCapitalW:
+  Enabled: false
+
+# we prefer compact if-else-end/case-when-end alignment
+Lint/EndAlignment:
+  AlignWith: variable
+Style/CaseIndentation:
+  IndentWhenRelativeTo: end
+
+# we prefer Perl-style regex back references
+Style/PerlBackrefs:
+  Enabled: false
+
+# makes diffs nicer
+Style/TrailingCommaInLiteral:
+  EnforcedStyleForMultiline: comma
+
+# we won't change backward compatible method names
+Style/MethodName:
+  Exclude:
+    - 'Homebrew/compat/**/*'
+
+# we won't change backward compatible predicate names
+Style/PredicateName:
+  Exclude:
+    - 'Homebrew/compat/**/*'
+
+# `formula do` uses nested method definitions
+Lint/NestedMethodDefinition:
+  Exclude:
+    - 'Homebrew/test/**/*'
diff --git a/Library/.rubocop_todo.yml b/Library/.rubocop_todo.yml
index 18b69e207e7633bf21aff482dd71e82e2a00b535..a898d2f799cbffe1d7610fb94947c05424f5c4e1 100644
--- a/Library/.rubocop_todo.yml
+++ b/Library/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
-# `rubocop --auto-gen-config`
-# on 2016-09-17 15:44:31 +0100 using RuboCop version 0.42.0.
+# `rubocop --auto-gen-config --exclude-limit 30`
+# on 2016-09-18 15:15:22 +0100 using RuboCop version 0.41.2.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -48,6 +48,7 @@ Lint/Loop:
 # Offense count: 6
 Lint/NestedMethodDefinition:
   Exclude:
+    - 'Homebrew/test/**/*'
     - 'Homebrew/dev-cmd/bottle.rb'
     - 'Homebrew/dev-cmd/test-bot.rb'
 
@@ -58,7 +59,23 @@ Lint/NonLocalExitFromIterator:
 
 # Offense count: 28
 Lint/RescueException:
-  Enabled: false
+  Exclude:
+    - 'Homebrew/brew.rb'
+    - 'Homebrew/build.rb'
+    - 'Homebrew/cmd/fetch.rb'
+    - 'Homebrew/cmd/reinstall.rb'
+    - 'Homebrew/cmd/update-report.rb'
+    - 'Homebrew/debrew.rb'
+    - 'Homebrew/dev-cmd/pull.rb'
+    - 'Homebrew/dev-cmd/test.rb'
+    - 'Homebrew/formula.rb'
+    - 'Homebrew/formula_installer.rb'
+    - 'Homebrew/migrator.rb'
+    - 'Homebrew/postinstall.rb'
+    - 'Homebrew/readall.rb'
+    - 'Homebrew/test.rb'
+    - 'Homebrew/test/test_ENV.rb'
+    - 'Homebrew/utils/fork.rb'
 
 # Offense count: 1
 Lint/ShadowedException:
@@ -77,7 +94,7 @@ Metrics/BlockNesting:
 # Offense count: 20
 # Configuration parameters: CountComments.
 Metrics/ModuleLength:
-  Max: 369
+  Max: 400
 
 # Offense count: 1
 # Configuration parameters: CountKeywordArgs.
@@ -110,7 +127,23 @@ Style/Alias:
 
 # Offense count: 26
 Style/CaseEquality:
-  Enabled: false
+  Exclude:
+    - 'Homebrew/cleanup.rb'
+    - 'Homebrew/cmd/search.rb'
+    - 'Homebrew/compilers.rb'
+    - 'Homebrew/cxxstdlib.rb'
+    - 'Homebrew/debrew.rb'
+    - 'Homebrew/dependencies.rb'
+    - 'Homebrew/dependency_collector.rb'
+    - 'Homebrew/download_strategy.rb'
+    - 'Homebrew/formula.rb'
+    - 'Homebrew/options.rb'
+    - 'Homebrew/patch.rb'
+    - 'Homebrew/pkg_version.rb'
+    - 'Homebrew/requirement.rb'
+    - 'Homebrew/requirements.rb'
+    - 'Homebrew/software_spec.rb'
+    - 'Homebrew/version.rb'
 
 # Offense count: 1
 # Cop supports --auto-correct.
@@ -170,6 +203,7 @@ Style/IdenticalConditionalBranches:
 # SupportedStyles: snake_case, camelCase
 Style/MethodName:
   Exclude:
+    - 'Homebrew/compat/**/*'
     - 'Homebrew/cleanup.rb'
     - 'Homebrew/diagnostic.rb'
     - 'Homebrew/formula_cellar_checks.rb'
@@ -230,7 +264,7 @@ Style/OpMethod:
 # NameWhitelist: is_a?
 Style/PredicateName:
   Exclude:
-    - 'spec/**/*'
+    - 'Homebrew/compat/**/*'
     - 'Homebrew/download_strategy.rb'
     - 'Homebrew/hardware.rb'
 
diff --git a/Library/Homebrew/compat/.rubocop.yml b/Library/Homebrew/compat/.rubocop.yml
deleted file mode 100644
index c07e248914cd51e267317048d51292a4479a8964..0000000000000000000000000000000000000000
--- a/Library/Homebrew/compat/.rubocop.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-inherit_from: ../../.rubocop.yml
-
-# We won't change method or predicate names because of backward compatibility.
-Style/MethodName:
-  Enabled: false
-Style/PredicateName:
-  Enabled: false
diff --git a/Library/Homebrew/test/.rubocop.yml b/Library/Homebrew/test/.rubocop.yml
deleted file mode 100644
index 6f1bcba97337c92f4cbbd57eb881a62aeb0b8894..0000000000000000000000000000000000000000
--- a/Library/Homebrew/test/.rubocop.yml
+++ /dev/null
@@ -1,5 +0,0 @@
-inherit_from: ../../.rubocop.yml
-
-# `formula do` uses nested method definitions
-Lint/NestedMethodDefinition:
-  Enabled: false