Fixes jordansissel#554 do not map existing paths with = in them

lib/fpm/package/dir.rb

@@ -43,7 +43,7 @@ def input(path)
     # This mapping should work the same way 'rsync -a' does
     #   Meaning 'rsync -a source dest'
     #   and 'source=dest' in fpm work the same as the above rsync
-    if path =~ /.=./
+    if path =~ /.=./ && !File.exists?(chdir == '.' ? path : File.join(chdir, path))
       origin, destination = path.split("=", 2)
 
       if File.directory?(origin) && origin[-1,1] == "/"

spec/fpm/package/dir_spec.rb

@@ -97,5 +97,22 @@
         insist { File }.exist?(File.join(output, expected_file))
       end
     end
+
+    it "should not map existing paths with = in them" do
+      File.write(File.join(tmpdir, "a=b"), "hello world")
+      subject.input(File.join(tmpdir, "a=b"))
+      subject.output(output)
+      insist { File }.exist?(File.join(output, tmpdir, "a=b"))
+    end
+
+    it "should not map existing paths with = in them and obey :chdir and :prefix attributes" do
+      Dir.mkdir(File.join(tmpdir, "a"))
+      File.write(File.join(tmpdir,"a",  "a=b"), "hello world")
+      subject.attributes[:chdir] = tmpdir
+      subject.attributes[:prefix] = "/foo"
+      subject.input(File.join("a", "a=b"))
+      subject.output(output)
+      insist { File }.exist?(File.join(output, "foo", "a", "a=b"))
+    end
   end
 end # describe FPM::Package::Dir