3 files changed, 44 insertions, 37 deletions
diff --git a/lib/rubygems/source/git.rb b/lib/rubygems/source/git.rb
index 0900da0cbc..23f8928a4e 100644
--- a/lib/rubygems/source/git.rb
+++ b/lib/rubygems/source/git.rb
@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-require 'digest'
 require 'rubygems/util'
 
 ##
@@ -226,6 +225,8 @@ class Gem::Source::Git < Gem::Source
   # A hash for the git gem based on the git repository URI.
 
   def uri_hash # :nodoc:
+    require 'digest' # required here to avoid deadlocking in Gem.activate_bin_path (because digest is a gem on 2.5+)
+
     normalized =
       if @repository =~ %r%^\w+://(\w+@)?% then
         uri = URI(@repository).normalize.to_s.sub %r%/$%,''
diff --git a/lib/rubygems/source/local.rb b/lib/rubygems/source/local.rb
index 3227fb61b0..5ab7a467b5 100644
--- a/lib/rubygems/source/local.rb
+++ b/lib/rubygems/source/local.rb
@@ -9,6 +9,7 @@ class Gem::Source::Local < Gem::Source
     @specs   = nil
     @api_uri = nil
     @uri     = nil
+    @load_specs_names = {}
   end
 
   ##
@@ -34,45 +35,47 @@ class Gem::Source::Local < Gem::Source
   end
 
   def load_specs type # :nodoc:
-    names = []
-
-    @specs = {}
-
-    Dir["*.gem"].each do |file|
-      begin
-        pkg = Gem::Package.new(file)
-      rescue SystemCallError, Gem::Package::FormatError
-        # ignore
-      else
-        tup = pkg.spec.name_tuple
-        @specs[tup] = [File.expand_path(file), pkg]
-
-        case type
-        when :released
-          unless pkg.spec.version.prerelease?
-            names << pkg.spec.name_tuple
-          end
-        when :prerelease
-          if pkg.spec.version.prerelease?
-            names << pkg.spec.name_tuple
-          end
-        when :latest
-          tup = pkg.spec.name_tuple
+    @load_specs_names[type] ||= begin
+      names = []
 
-          cur = names.find { |x| x.name == tup.name }
-          if !cur
-            names << tup
-          elsif cur.version < tup.version
-            names.delete cur
-            names << tup
-          end
+      @specs = {}
+
+      Dir["*.gem"].each do |file|
+        begin
+          pkg = Gem::Package.new(file)
+        rescue SystemCallError, Gem::Package::FormatError
+          # ignore
         else
-          names << pkg.spec.name_tuple
+          tup = pkg.spec.name_tuple
+          @specs[tup] = [File.expand_path(file), pkg]
+
+          case type
+          when :released
+            unless pkg.spec.version.prerelease?
+              names << pkg.spec.name_tuple
+            end
+          when :prerelease
+            if pkg.spec.version.prerelease?
+              names << pkg.spec.name_tuple
+            end
+          when :latest
+            tup = pkg.spec.name_tuple
+
+            cur = names.find { |x| x.name == tup.name }
+            if !cur
+              names << tup
+            elsif cur.version < tup.version
+              names.delete cur
+              names << tup
+            end
+          else
+            names << pkg.spec.name_tuple
+          end
         end
       end
-    end
 
-    names
+      names
+    end
   end
 
   def find_gem gem_name, version = Gem::Requirement.default, # :nodoc:
@@ -88,7 +91,7 @@ class Gem::Source::Local < Gem::Source
         if version.satisfied_by?(s.version)
           if prerelease
             found << s
-          elsif !s.version.prerelease?
+          elsif !s.version.prerelease? || version.prerelease?
             found << s
           end
         end
diff --git a/lib/rubygems/source/lock.rb b/lib/rubygems/source/lock.rb
index 86b16e964c..59717be2c0 100644
--- a/lib/rubygems/source/lock.rb
+++ b/lib/rubygems/source/lock.rb
@@ -34,6 +34,10 @@ class Gem::Source::Lock < Gem::Source
     0 == (self <=> other)
   end
 
+  def hash # :nodoc:
+    @wrapped.hash ^ 3
+  end
+
   ##
   # Delegates to the wrapped source's fetch_spec method.
 
@@ -46,4 +50,3 @@ class Gem::Source::Lock < Gem::Source
   end
 
 end
-