[rubygems/rubygems] Add CHECKSUMS for each gem in lockfile

We lock the checksum for each resolved spec under a new CHECKSUMS
section in the lockfile.

If the locked spec does not resolve for the local platform, we preserve
the locked checksum, similar to how we preserve specs.

Checksum locking only makes sense on install. The compact index
information is only available then.

https://github.com/rubygems/rubygems/commit/bde37ca6bf

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/bundler/lazy_specification.rb b/lib/bundler/lazy_specification.rb
index c9b161dc0e..b4aadb0b5c 100644
--- a/lib/bundler/lazy_specification.rb
+++ b/lib/bundler/lazy_specification.rb
@@ -76,6 +76,18 @@ module Bundler
       out
     end
 
+    #def materialize_for_checksum
+      #if @specification
+        #yield
+      #else
+        #materialize_for_installation
+
+        #yield
+
+        #@specification = nil
+      #end
+    #end
+
     def materialize_for_installation
       source.local!
 
@@ -134,6 +146,20 @@ module Bundler
       " #{source.revision[0..6]}"
     end
 
+    def to_checksum
+      return nil unless @specification
+
+      #
+      # See comment about #ruby_platform_materializes_to_ruby_platform?
+      # If the old lockfile format is present where there is no specific
+      # platform, then we should skip locking checksums as it is not
+      # deterministic which platform variant is locked.
+      #
+      return nil unless ruby_platform_materializes_to_ruby_platform?
+
+      @specification.to_checksum
+    end
+
     private
 
     def use_exact_resolved_specifications?