[ruby/rubygems] Accept required_ruby_version and required_rubygems_version overrides

Extend the override DSL whitelist so per-gem metadata fields can be
declared. The :all target is rejected for now with a "not yet
supported" error so the field is purely per-gem until the next step
adds :all propagation.

https://github.com/ruby/rubygems/commit/f9e4d7bf29

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2 files changed, 31 insertions, 5 deletions

diff --git a/lib/bundler/dsl.rb b/lib/bundler/dsl.rb
index 05eb493677..92abd07a84 100644
--- a/lib/bundler/dsl.rb
+++ b/lib/bundler/dsl.rb
@@ -185,7 +185,7 @@ module Bundler
       with_source(git_source) { yield }
     end
 
-    SUPPORTED_OVERRIDE_FIELDS = [:version].freeze
+    SUPPORTED_OVERRIDE_FIELDS = [:version, :required_ruby_version, :required_rubygems_version].freeze
     SUPPORTED_OVERRIDE_SYMBOL_OPERATIONS = [:ignore_upper].freeze
 
     def override(target, **operations)
@@ -195,6 +195,10 @@ module Bundler
         raise ArgumentError, "`override :all, version:` is not allowed; version requirements are per-gem"
       end
 
+      if target == :all && operations.any?
+        raise ArgumentError, "`override :all` is not yet supported"
+      end
+
       operations.each do |field, operation|
         validate_override_field!(field)
         validate_override_operation!(operation)
@@ -274,7 +278,8 @@ module Bundler
 
     def validate_override_field!(field)
       return if SUPPORTED_OVERRIDE_FIELDS.include?(field)
-      raise ArgumentError, "unsupported override field `#{field}:`; only `version:` is currently supported"
+      supported = SUPPORTED_OVERRIDE_FIELDS.map {|f| "`#{f}:`" }.join(", ")
+      raise ArgumentError, "unsupported override field `#{field}:`; supported fields: #{supported}"
     end
 
     def validate_override_operation!(operation)
diff --git a/spec/bundler/bundler/dsl_spec.rb b/spec/bundler/bundler/dsl_spec.rb
index 99ab9088f9..6df665e3d9 100644
--- a/spec/bundler/bundler/dsl_spec.rb
+++ b/spec/bundler/bundler/dsl_spec.rb
@@ -425,8 +425,29 @@ RSpec.describe Bundler::Dsl do
 
     it "raises ArgumentError for an unsupported field" do
       expect do
-        subject.override("rails", required_ruby_version: :ignore_upper)
-      end.to raise_error(ArgumentError, /unsupported override field `required_ruby_version:`/)
+        subject.override("rails", as: "y")
+      end.to raise_error(ArgumentError, /unsupported override field `as:`/)
+    end
+
+    it "stores an Override for a gem with a required_ruby_version: operation" do
+      subject.override("rails", required_ruby_version: :ignore_upper)
+      override = subject.overrides.first
+      expect(override.target).to eq("rails")
+      expect(override.field).to eq(:required_ruby_version)
+      expect(override.operation).to eq(:ignore_upper)
+    end
+
+    it "stores an Override for a gem with a required_rubygems_version: operation" do
+      subject.override("rails", required_rubygems_version: nil)
+      override = subject.overrides.first
+      expect(override.field).to eq(:required_rubygems_version)
+      expect(override.operation).to be_nil
+    end
+
+    it "raises ArgumentError for `override :all, required_ruby_version:` until :all is implemented" do
+      expect do
+        subject.override(:all, required_ruby_version: :ignore_upper)
+      end.to raise_error(ArgumentError, /`override :all` is not yet supported/)
     end
 
     it "raises ArgumentError for a non-string, non-symbol, non-nil operation" do
@@ -456,7 +477,7 @@ RSpec.describe Bundler::Dsl do
 
     it "rejects atomically when one field in a multi-field call is invalid" do
       expect do
-        subject.override("rails", version: ">= 8.0", required_ruby_version: :ignore_upper)
+        subject.override("rails", version: ">= 8.0", as: "y")
       end.to raise_error(ArgumentError, /unsupported override field/)
       expect(subject.overrides).to eq([])
     end