Add ability to lockfile to retrieve spec repo for pod name

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 ##### Enhancements
 
+* Add ability to lockfile to retrieve spec repo for pod name  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#434](https://github.com/CocoaPods/Core/pull/434)
+
 * `HTTP::perform_head_request` now includes a 1-byte `Range` header in the fallback GET
   request.
   [Kyle Fleming](https://github.com/kylefleming)

lib/cocoapods-core/lockfile.rb

@@ -77,7 +77,7 @@ def pod_names
 
     # Returns the version of the given Pod.
     #
-    # @param [name] The name of the Pod (root name of the specification).
+    # @param [String] pod_name The name of the Pod (root name of the specification).
     #
     # @return [Version] The version of the pod.
     #
@@ -92,9 +92,21 @@ def version(pod_name)
       pod_versions[root_name]
     end
 
+    # Returns the source of the given Pod.
+    #
+    # @param [String] pod_name The name of the Pod (root name of the specification).
+    #
+    # @return [String] The source of the pod.
+    #
+    # @return [Nil] If there is no source stored for the given name.
+    #
+    def spec_repo(pod_name)
+      spec_repos_by_pod[pod_name]
+    end
+
     # Returns the checksum for the given Pod.
     #
-    # @param [name] The name of the Pod (root name of the specification).
+    # @param [String] name The name of the Pod (root name of the specification).
     #
     # @return [String] The checksum of the specification for the given Pod.
     #
@@ -236,6 +248,17 @@ def checksum_data
       internal_data['SPEC CHECKSUMS'] || {}
     end
 
+    # @return [Hash{String => String}] A hash containing the spec repo used for the specification
+    #         by the name of the root spec.
+    #
+    def spec_repos_by_pod
+      @spec_repos_by_pod ||= pods_by_spec_repo.each_with_object({}) do |(spec_repo, pods), spec_repos_by_pod|
+        pods.each do |pod|
+          spec_repos_by_pod[pod] = spec_repo
+        end
+      end
+    end
+
     #-------------------------------------------------------------------------#
 
     # !@group Comparison with a Podfile

spec/lockfile_spec.rb

@@ -185,6 +185,12 @@ def self.specs_by_source
         @lockfile.version('BananaLib').should == Version.new('1.0')
       end
 
+      it 'returns the spec repo of a given pod' do
+        @lockfile.spec_repo('BananaLib').should == 'https://github.com/CocoaPods/Specs.git'
+        @lockfile.spec_repo('JSONKit').should.be.nil
+        @lockfile.spec_repo('monkey').should == 'https://github.com/CocoaPods/Specs.git'
+      end
+
       it 'returns the checksum for the given Pod' do
         @lockfile.checksum('BananaLib').should == 'd46ca864666e216300a0653de197668b12e732a1'
       end