[Sandbox] Evaluate podspecs from their original path

Re https://github.com/CocoaPods/pod-template/issues/50

CHANGELOG.md

@@ -13,6 +13,12 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
   [Ash Furrow](ashfurrow]
   [#2136](https://github.com/CocoaPods/CocoaPods/issues/2136)
 
+* Always evaluate podspecs from the original podspec directory. This fixes
+  issues when you are using relative paths inside ruby podspecs and using a
+  pod's via `:path`.  
+  [Kyle Fuller](kylef)
+  [pod-template#50](https://github.com/CocoaPods/pod-template/issues/50)
+
 
 ## 0.33.1
 

lib/cocoapods/sandbox.rb

@@ -191,7 +191,8 @@ module Pod
     #
     def specification(name)
       if file = specification_path(name)
-        Specification.from_file(file)
+        original_path = development_pods[name]
+        Dir.chdir(original_path || Dir.pwd) { Specification.from_file(file) }
       end
     end
 
@@ -253,9 +254,13 @@ module Pod
         end
         FileUtils.copy(podspec, output_path)
       end
-      spec = Specification.from_file(output_path)
-      unless spec.name == name
-        raise Informative, "The name of the given podspec `#{spec.name}` doesn't match the expected one `#{name}`"
+
+      Dir.chdir(podspec.is_a?(Pathname) ? File.dirname(podspec) : Dir.pwd) do
+        spec = Specification.from_file(output_path)
+
+        unless spec.name == name
+          raise Informative, "The name of the given podspec `#{spec.name}` doesn't match the expected one `#{name}`"
+        end
       end
     end
 

spec/unit/sandbox_spec.rb

@@ -107,6 +107,18 @@ module Pod
         @sandbox.specification('BananaLib').name.should == 'BananaLib'
       end
 
+      it "loads the stored specification from the original path" do
+        spec_file = fixture('banana-lib/BananaLib.podspec')
+        spec = Specification.from_file(spec_file)
+        Specification.expects(:from_file).with do
+          Dir.pwd == fixture('banana-lib').to_s
+        end.twice.returns(spec)
+
+        @sandbox.store_podspec('BananaLib', spec_file)
+        @sandbox.store_local_path('BananaLib', fixture('banana-lib'))
+        @sandbox.specification('BananaLib')
+      end
+
       it "returns the directory where to store the specifications" do
         @sandbox.specifications_dir.should == temporary_directory + 'Sandbox/Local Podspecs'
       end