[rubygems/rubygems] Don't warn when a lockfile is locked to a dev version

Even if it's newer than the running versions. Dev versions are not
released to rubygems.org, so the warning message suggests a command that
doesn't work. And dev versions are currently non deterministic
(2.3.0.dev can be many different versions), so the warning doesn't
really make sense at the moment.

https://github.com/rubygems/rubygems/commit/6f31af27ef

lib/bundler/lockfile_parser.rb

@@ -86,6 +86,7 @@ module Bundler
 
     def warn_for_outdated_bundler_version
       return unless bundler_version
+      return if bundler_version.segments.last == "dev"
       prerelease_text = bundler_version.prerelease? ? " --pre" : ""
       current_version = Gem::Version.create(Bundler::VERSION)
       return unless current_version < bundler_version

spec/bundler/lock/lockfile_spec.rb

@@ -166,9 +166,10 @@ RSpec.describe "the lockfile format" do
     G
   end
 
-  it "warns if the current is older than lockfile's bundler version" do
+  it "warns if the current version is older than lockfile's bundler version, and locked version is a final release" do
-    current_version = Bundler::VERSION
+    current_version = "999.998.999"
-    newer_minor = bump_minor(current_version)
+    system_gems "bundler-#{current_version}"
+    newer_minor = "999.999.0"
 
     lockfile <<-L
       GEM
@@ -186,17 +187,16 @@ RSpec.describe "the lockfile format" do
          #{newer_minor}
     L
 
-    install_gemfile <<-G
+    install_gemfile <<-G, :env => { "BUNDLER_VERSION" => current_version }
       source "#{file_uri_for(gem_repo2)}"
 
       gem "rack"
     G
 
-    pre_flag = prerelease?(newer_minor) ? " --pre" : ""
     warning_message = "the running version of Bundler (#{current_version}) is older " \
                       "than the version that created the lockfile (#{newer_minor}). " \
                       "We suggest you to upgrade to the version that created the " \
-                      "lockfile by running `gem install bundler:#{newer_minor}#{pre_flag}`."
+                      "lockfile by running `gem install bundler:#{newer_minor}`."
     expect(err).to include warning_message
 
     lockfile_should_be <<-G
@@ -216,6 +216,102 @@ RSpec.describe "the lockfile format" do
     G
   end
 
+  it "warns if the current version is older than lockfile's bundler version, and locked version is a prerelease" do
+    current_version = "999.998.999"
+    system_gems "bundler-#{current_version}"
+    newer_minor = "999.999.0.pre1"
+
+    lockfile <<-L
+      GEM
+        remote: #{file_uri_for(gem_repo2)}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{newer_minor}
+    L
+
+    install_gemfile <<-G, :env => { "BUNDLER_VERSION" => current_version }
+      source "#{file_uri_for(gem_repo2)}"
+
+      gem "rack"
+    G
+
+    warning_message = "the running version of Bundler (#{current_version}) is older " \
+                      "than the version that created the lockfile (#{newer_minor}). " \
+                      "We suggest you to upgrade to the version that created the " \
+                      "lockfile by running `gem install bundler:#{newer_minor} --pre`."
+    expect(err).to include warning_message
+
+    lockfile_should_be <<-G
+      GEM
+        remote: #{file_uri_for(gem_repo2)}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{newer_minor}
+    G
+  end
+
+  it "doesn't warn if the current version is older than lockfile's bundler version, and locked version is a dev version" do
+    current_version = "999.998.999"
+    system_gems "bundler-#{current_version}"
+    newer_minor = "999.999.0.dev"
+
+    lockfile <<-L
+      GEM
+        remote: #{file_uri_for(gem_repo2)}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{newer_minor}
+    L
+
+    install_gemfile <<-G, :env => { "BUNDLER_VERSION" => current_version }
+      source "#{file_uri_for(gem_repo2)}"
+
+      gem "rack"
+    G
+
+    expect(err).to be_empty
+
+    lockfile_should_be <<-G
+      GEM
+        remote: #{file_uri_for(gem_repo2)}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{newer_minor}
+    G
+  end
+
   it "warns when updating bundler major version" do
     current_version = Bundler::VERSION
     older_major = previous_major(current_version)