audit: check the version does not decrease.

This will prevent `brew upgrade` from working correctly.

1 files changed, 8 insertions, 4 deletions

diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 12eaf9167..a8592c8e9 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -653,10 +653,11 @@ 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
@@ -664,11 +665,14 @@ class FormulaAuditor
       end
     end
 
-    revision_map = attributes_map[:revision]
+    versions = attributes_map[:version].keys
+    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