Preserve external sources on locked dependencies in the resolver

CHANGELOG.md

@@ -66,6 +66,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 * Speed up `pod install` times by up to 50% for very large project.  
   [Samuel Giddins](https://github.com/segiddins)
 
+* Avoid dependency resolution conflicts when a pod depends upon a local pod.  
+  [Samuel Giddins](https://github.com/segiddins)
+
 
 ## 1.4.0 (2018-01-18)
 

Gemfile.lock

@@ -250,7 +250,7 @@ GEM
     terminal-table (1.6.0)
     thread_safe (0.3.6)
     tins (1.8.1)
-    tzinfo (1.2.4)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     unicode-display_width (0.3.1)
     webmock (2.3.1)

lib/cocoapods/installer/analyzer/locking_dependency_analyzer.rb

@@ -33,10 +33,9 @@ module Pod
           dependency_graph = Molinillo::DependencyGraph.new
 
           if lockfile
-            explicit_dependencies = lockfile.to_hash['DEPENDENCIES'] || []
-            explicit_dependencies.each do |string|
-              dependency = Dependency.new(string)
-              dependency_graph.add_vertex(dependency.name, nil, true)
+            explicit_dependencies = lockfile.dependencies
+            explicit_dependencies.each do |dependency|
+              dependency_graph.add_vertex(dependency.name, dependency, true)
             end
 
             pods = lockfile.to_hash['PODS'] || []
@@ -46,7 +45,7 @@ module Pod
 
             pods_to_update = pods_to_update.flat_map do |u|
               root_name = Specification.root_name(u).downcase
-              dependency_graph.vertices.keys.select { |n| Specification.root_name(n).downcase == root_name }
+              dependency_graph.vertices.each_key.select { |n| Specification.root_name(n).downcase == root_name }
             end
 
             pods_to_update.each do |u|
@@ -73,7 +72,9 @@ module Pod
           if pods_to_unlock.include?(dependency.root_name)
             dependency = Dependency.new(dependency.name)
           end
-          dependency_graph.add_child_vertex(dependency.name, parents.empty? ? dependency : nil, parents, nil)
+          vertex = dependency_graph.add_child_vertex(dependency.name, nil, parents, nil)
+          dependency = vertex.payload.merge(dependency) if vertex.payload
+          vertex.payload = dependency
           dependency
         end
 

lib/cocoapods/resolver.rb

@@ -163,7 +163,9 @@ module Pod
     def search_for(dependency)
       @search ||= {}
       @search[dependency] ||= begin
-        specifications_for_dependency(dependency, [requirement_for_locked_pod_named(dependency.name)])
+        locked_requirement = requirement_for_locked_pod_named(dependency.name)
+        additional_requirements = Array(locked_requirement)
+        specifications_for_dependency(dependency, additional_requirements)
       end
       @search[dependency].dup
     end
@@ -357,7 +359,7 @@ module Pod
     # @return [Array<Specification>] List of specifications satisfying given requirements.
     #
     def specifications_for_dependency(dependency, additional_requirements = [])
-      requirement = Requirement.new(dependency.requirement.as_list + additional_requirements)
+      requirement = Requirement.new(dependency.requirement.as_list + additional_requirements.flat_map(&:as_list))
       find_cached_set(dependency).
         all_specifications(installation_options.warn_for_multiple_pod_sources).
         select { |s| requirement.satisfied_by? s.version }.