Raise an error at runtime when Faraday Multipart is not installed:

- In 7bc6dd5, a warning message was
  added to let users know that faraday-multipart is required when
  using Faraday 2.0.

  This warning is not very helpful, and may lead to projects adding
  the gem to their dependencies even if they don't need it, as the
  faraday-multipart middleware is only used for uploading license for
  GitHub entrepise.

  This patch will avoid printing the warning unnecessarily but also
  display a better error message when ultimately
  the call to `conn.request :multipart` fails.

  Fix #1701

lib/octokit/default.rb

@@ -12,11 +12,6 @@
   rescue LoadError
     Octokit::Warnable.octokit_warn 'To use retry middleware with Faraday v2.0+, install `faraday-retry` gem'
   end
-  begin
-    require 'faraday/multipart'
-  rescue LoadError
-    Octokit::Warnable.octokit_warn 'To use multipart middleware with Faraday v2.0+, install `faraday-multipart` gem; note: this is used by the ManageGHES client for uploading licenses'
-  end
 end
 
 module Octokit

lib/octokit/enterprise_management_console_client/management_console.rb

@@ -171,7 +171,14 @@ def password_hash
     def faraday_configuration
       @faraday_configuration ||= Faraday.new(url: @management_console_endpoint) do |http|
         http.headers[:user_agent] = user_agent
-        http.request :multipart
+        begin
+          http.request :multipart
+        rescue Faraday::Error
+          raise Faraday::Error, <<~ERROR
+            The `faraday-multipart` gem is required to upload a license.
+            Please add `gem "faraday-multipart"` to your Gemfile.
+          ERROR
+        end
         http.request :url_encoded
 
         # Disabling SSL is essential for certain self-hosted Enterprise instances

lib/octokit/manage_ghes_client/manage_ghes.rb

@@ -36,7 +36,14 @@ def set_maintenance_mode(enabled, options = {})
     # @return [nil]
     def upload_license(license)
       conn = authenticated_client
-      conn.request :multipart
+      begin
+        conn.request :multipart
+      rescue Faraday::Error
+        raise Faraday::Error, <<~ERROR
+          The `faraday-multipart` gem is required to upload a license.
+          Please add `gem "faraday-multipart"` to your Gemfile.
+        ERROR
+      end
       params = {}
       params[:license] = Faraday::FilePart.new(license, 'binary')
       params[:password] = @manage_ghes_password

spec/octokit/enterprise_management_console_client/management_console_spec.rb

@@ -14,6 +14,15 @@
       expect(@enterprise_management_console_client.last_response.status).to eq(202)
       assert_requested :post, github_management_console_url('setup/api/start')
     end
+
+    it 'raises an error if the faraday-multipart gem is not installed' do
+      middleware_key = :multipart
+      middleware = Faraday::Request.unregister_middleware(middleware_key)
+
+      expect { @enterprise_management_console_client.upload_license(@license) }.to raise_error Faraday::Error
+    ensure
+      Faraday::Request.register_middleware(middleware_key => middleware) if middleware
+    end
   end # .upload_license
 
   describe '.start_configuration', :vcr do

spec/octokit/ghes_manage_client/ghes_manage_spec.rb

@@ -38,6 +38,15 @@
       expect(@manage_ghes.last_response.status).to eq(202)
       assert_requested :post, github_manage_ghes_url('/manage/v1/config/init')
     end
+
+    it 'raises an error if the faraday-multipart gem is not installed' do
+      middleware_key = :multipart
+      middleware = Faraday::Request.unregister_middleware(middleware_key)
+
+      expect { @manage_ghes.upload_license(@license) }.to raise_error Faraday::Error
+    ensure
+      Faraday::Request.register_middleware(middleware_key => middleware) if middleware
+    end
   end # .upload_license
 
   describe '.start_configuration', :vcr do