Restrict raising on version mismatches to after bundler 2

lib/bundler/lockfile_parser.rb

@@ -103,7 +103,7 @@ def warn_for_outdated_bundler_version
       current_version = Gem::Version.create(Bundler::VERSION)
       current_major_version = current_version.segments.first
       major_bundler_version = bundler_version.segments.first
-      if current_major_version < major_bundler_version
+      if current_major_version < major_bundler_version && current_major_version > 2
         raise LockfileError, "You must use Bundler #{major_bundler_version} or greater with this lockfile."
       end
       return unless current_version < bundler_version

spec/lock/lockfile_bundler_1_spec.rb

@@ -203,7 +203,7 @@
     G
   end
 
-  it "errors if the current is a major version older than lockfile's bundler version" do
+  it "warns if the current is a major version older than lockfile's bundler version" do
     lockfile <<-L
       GEM
         remote: file://localhost#{gem_repo1}/
@@ -227,45 +227,11 @@
     G
 
     expect(exitstatus > 0) if exitstatus
-    expect(out).to include("You must use Bundler 9999999 or greater with this lockfile.")
-  end
-
-  it "shows a friendly error when running with a new bundler 2 lockfile" do
-    lockfile <<-L
-      GEM
-        remote: https://rails-assets.org/
-        specs:
-         rails-assets-bootstrap (3.3.4)
-           rails-assets-jquery (>= 1.9.1)
-         rails-assets-jquery (2.1.4)
-
-      GEM
-        remote: https://rubygems.org/
-        specs:
-         rake (10.4.2)
-
-      PLATFORMS
-        ruby
-
-      DEPENDENCIES
-        rails-assets-bootstrap!
-        rake
-
-      BUNDLED WITH
-         9999999.0.0
-    L
-
-    install_gemfile <<-G
-      source 'https://rubygems.org'
-      gem 'rake'
-
-      source 'https://rails-assets.org' do
-        gem 'rails-assets-bootstrap'
-      end
-    G
-
-    expect(exitstatus > 0) if exitstatus
-    expect(err).to include("You must use Bundler 9999999 or greater with this lockfile.")
+    warning_message = "the running version of Bundler (#{Bundler::VERSION}) is older " \
+                      "than the version that created the lockfile (9999999.0.0). " \
+                      "We suggest you to upgrade to the version that created the " \
+                      "lockfile by running `gem install bundler:9999999.0.0`."
+    expect(err).to include warning_message
   end
 
   it "warns when updating bundler major version" do

spec/lock/lockfile_spec.rb

@@ -154,7 +154,7 @@
     G
   end
 
-  it "outputs a warning if the current is older than lockfile's bundler version" do
+  it "outputs a warning if the current major is higher than 2 and older than lockfile's bundler version" do
     lockfile <<-L
       GEM
         remote: file://localhost#{gem_repo1}/
@@ -202,7 +202,7 @@
     G
   end
 
-  it "errors if the current is a major version older than lockfile's bundler version" do
+  it "warns if the current major version is not higher that 2 and older than lockfile's bundler version" do
     lockfile <<-L
       GEM
         remote: file://localhost#{gem_repo1}/
@@ -225,11 +225,43 @@
       gem "rack"
     G
 
+    warning_message = "the running version of Bundler (#{Bundler::VERSION}) is older " \
+                      "than the version that created the lockfile (9999999.0.0). " \
+                      "We suggest you to upgrade to the version that created the " \
+                      "lockfile by running `gem install bundler:9999999.0.0`."
+    expect(err).to include warning_message
+  end
+
+  it "errors if the current major version is higher that 2 and older than lockfile's bundler version" do
+    lockfile <<-L
+      GEM
+        remote: file://localhost#{gem_repo1}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         9999999.0.0
+    L
+
+    simulate_bundler_version "3.0.0" do
+      install_gemfile <<-G
+        source "file://localhost#{gem_repo1}/"
+
+        gem "rack"
+      G
+    end
+
     expect(last_command).to be_failure
     expect(err).to include("You must use Bundler 9999999 or greater with this lockfile.")
   end
 
-  it "shows a friendly error when running with a new bundler 2 lockfile" do
+  it "shows a friendly error when running with a new bundler 3 lockfile" do
     lockfile <<-L
       GEM
         remote: https://rails-assets.org/
@@ -254,14 +286,16 @@
          9999999.0.0
     L
 
-    install_gemfile <<-G
-      source 'https://rubygems.org'
-      gem 'rake'
+    simulate_bundler_version "3.0.0" do
+      install_gemfile <<-G
+        source 'https://rubygems.org'
+        gem 'rake'
 
-      source 'https://rails-assets.org' do
-        gem 'rails-assets-bootstrap'
-      end
-    G
+        source 'https://rails-assets.org' do
+          gem 'rails-assets-bootstrap'
+        end
+      G
+    end
 
     expect(last_command).to be_failure
     expect(err).to include("You must use Bundler 9999999 or greater with this lockfile.")