Try on release

Author: Edouard-chin

spec/commands/lock_spec.rb

@@ -2295,6 +2295,10 @@
 
     bundle("lock --add-checksums", artifice: "endpoint")
 
+   checksums = checksums_section_when_enabled do |c|
+      c.no_checksum "warning", "18.0.0"
+    end
+
     expect(lockfile).to eq <<~L
       GEM
         remote: https://gem.repo4/
@@ -2306,10 +2310,7 @@
 
       DEPENDENCIES
         warning
-
-      CHECKSUMS
-        warning (18.0.0)
-
+      #{checksums}
       BUNDLED WITH
         #{Bundler::VERSION}
     L

spec/commands/update_spec.rb

@@ -1419,9 +1419,7 @@
          #{lockfile_platforms}
 
        DEPENDENCIES
-
-       CHECKSUMS
-
+       #{checksums_section_when_enabled}
        RUBY VERSION
          #{Bundler::RubyVersion.system}
 
@@ -1708,6 +1706,7 @@
     checksums = checksums_section_when_enabled do |c|
       c.checksum(gem_repo4, "myrack", "1.0")
     end
+    checksums.delete("bundler")
 
     expect(lockfile).to eq <<~L
         GEM

spec/support/checksums.rb

@@ -3,6 +3,8 @@
 module Spec
   module Checksums
     class ChecksumsBuilder
+      attr_reader :bundler_registered
+
       def initialize(enabled = true, &block)
         @enabled = enabled
         @checksums = {}
@@ -15,6 +17,8 @@ def initialize_copy(original)
       end
 
       def checksum(repo, name, version, platform = Gem::Platform::RUBY, folder = "gems")
+        @bundler_registered = true if name == "bundler"
+
         name_tuple = Gem::NameTuple.new(name, version, platform)
         gem_file = File.join(repo, folder, "#{name_tuple.full_name}.gem")
         File.open(gem_file, "rb") do |f|
@@ -50,8 +54,13 @@ def register(name_tuple, checksum)
       end
     end
 
-    def checksums_section(enabled = true, &block)
-      ChecksumsBuilder.new(enabled, &block)
+    def checksums_section(enabled = true, bundler_checksum: true, &block)
+      ChecksumsBuilder.new(enabled, &block).tap do |builder|
+        next if builder.bundler_registered || !bundler_checksum
+
+        next if Bundler::VERSION.to_s.end_with?(".dev")
+        builder.checksum(system_gem_path, "bundler", Bundler::VERSION, Gem::Platform::RUBY, "cache")
+      end
     end
 
     def checksums_section_when_enabled(target_lockfile = nil, &block)
@@ -64,7 +73,7 @@ def checksums_section_when_enabled(target_lockfile = nil, &block)
     end
 
     def checksum_to_lock(*args)
-      checksums_section do |c|
+      checksums_section(true, bundler_checksum: false) do |c|
         c.checksum(*args)
       end.to_s.sub(/^CHECKSUMS\n/, "").strip
     end