Merge pull request #6973 from rubygems/segiddins/lazily-construct-fetcher-debug-messages

(cherry picked from commit abc5758)

Author: martinemde

bundler/lib/bundler/fetcher/base.rb

@@ -38,9 +38,9 @@ def api_fetcher?
 
       private
 
-      def log_specs(debug_msg)
+      def log_specs(&block)
         if Bundler.ui.debug?
-          Bundler.ui.debug debug_msg
+          Bundler.ui.debug yield
         else
           Bundler.ui.info ".", false
         end

bundler/lib/bundler/fetcher/compact_index.rb

@@ -35,7 +35,7 @@ def specs_for_names(gem_names)
         remaining_gems = gem_names.dup
 
         until remaining_gems.empty?
-          log_specs "Looking up gems #{remaining_gems.inspect}"
+          log_specs { "Looking up gems #{remaining_gems.inspect}" }
 
           deps = begin
                    parallel_compact_index_client.dependencies(remaining_gems)

bundler/lib/bundler/fetcher/dependency.rb

@@ -24,7 +24,7 @@ def api_fetcher?
       def specs(gem_names, full_dependency_list = [], last_spec_list = [])
         query_list = gem_names.uniq - full_dependency_list
 
-        log_specs "Query List: #{query_list.inspect}"
+        log_specs { "Query List: #{query_list.inspect}" }
 
         return last_spec_list if query_list.empty?