From ef58225749cc9688b86293861f7e087a0edafc5e Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Sun, 30 Oct 2016 13:49:55 -0400
Subject: [PATCH] audit: check the version does not decrease.

This will prevent brew upgrade from working correctly.
---
 Library/Homebrew/dev-cmd/audit.rb | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 1fa5837059..3cebfc2256 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -655,10 +655,11 @@ class FormulaAuditor
     return unless formula.tap.git? # git log is required
 
     fv = FormulaVersions.new(formula, max_depth: 10)
-    attributes = [:revision, :version_scheme]
+    no_decrease_attributes = [:revision, :version_scheme]
+    attributes = no_decrease_attributes + [:version]
     attributes_map = fv.version_attributes_map(attributes, "origin/master")
 
-    attributes.each do |attribute|
+    no_decrease_attributes.each do |attribute|
       attributes_for_version = attributes_map[attribute][formula.version]
       next if attributes_for_version.empty?
       if formula.send(attribute) < attributes_for_version.max
@@ -666,11 +667,14 @@ class FormulaAuditor
       end
     end
 
-    revision_map = attributes_map[:revision]
+    versions = attributes_map[:version].values.flatten
+    if formula.version < versions.max
+      problem "version should not decrease"
+    end
 
     return if formula.revision.zero?
-
     if formula.stable
+      revision_map = attributes_map[:revision]
       if revision_map[formula.stable.version].empty? # check stable spec
         problem "'revision #{formula.revision}' should be removed"
       end