formula: realpath prefix before computing abv

versioned prefix is a directory, but unversioned is a symlink, so
realpath it before computing abv

1 files changed, 8 insertions, 2 deletions

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index eb85f804f..dcee0de85 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -553,7 +553,7 @@ class Formula
   # called from within the same formula's {#install} or {#post_install} methods.
   # Otherwise, return the full path to the formula's versioned cellar.
   def prefix(v = pkg_version)
-    prefix = rack/v
+    prefix = FormulaPrefixPathname.new(rack/v)
     if !@versioned_prefix && prefix.directory? && Keg.new(prefix).optlinked?
       opt_prefix
     else
@@ -938,7 +938,7 @@ class Formula
   # formula, as the path is stable even when the software is updated.
   # <pre>args << "--with-readline=#{Formula["readline"].opt_prefix}" if build.with? "readline"</pre>
   def opt_prefix
-    Pathname.new("#{HOMEBREW_PREFIX}/opt/#{name}")
+    FormulaPrefixPathname.new("#{HOMEBREW_PREFIX}/opt/#{name}")
   end
 
   def opt_bin
@@ -2423,4 +2423,10 @@ class Formula
       @link_overwrite_paths ||= Set.new
     end
   end
+
+  class FormulaPrefixPathname < Pathname
+    def abv
+      Pathname.new(realpath).abv
+    end
+  end
 end