Prevent user mistakes

.github/actions/easy_compile/dist/index.js

@@ -28211,7 +28211,7 @@ async function run(workingDirectory) {
   let ccRubies = cp.execSync('easy_compile print_ruby_cc_version', { cwd: workingDirectory, encoding: 'utf-8' })
 
   await downloadRubies(ccRubies.split(':'))
-  setupRakeCompilerConfig()
+  setupRakeCompilerConfig(workingDirectory)
 }
 
 async function downloadRubies(rubies) {
@@ -28227,11 +28227,11 @@ async function downloadRubies(rubies) {
   }
 }
 
-function setupRakeCompilerConfig() {
+function setupRakeCompilerConfig(workingDirectory) {
   let rubiesRbConfig = fs.globSync(`${rubiesPath()}/*/*/lib/ruby/*/*/rbconfig.rb`)
   let currentRubyVersion = cp.execSync('ruby -v', { encoding: 'utf-8' }).match(/^ruby (\d\.\d\.\d)/)[1]
   let rbConfigPath = path.join(os.homedir(), ".rake-compiler", "config.yml")
-  let rubyPlatform = cp.execSync('easy_compile print_normalized_platform', { encoding: 'utf-8' })
+  let rubyPlatform = cp.execSync('easy_compile print_normalized_platform', { cwd: workingDirectory, encoding: 'utf-8' })
 
   fs.mkdirSync(`${os.homedir()}/.rake-compiler`)
 

.github/actions/easy_compile/src/index.js

@@ -10,7 +10,7 @@ async function run(workingDirectory) {
   let ccRubies = cp.execSync('easy_compile print_ruby_cc_version', { cwd: workingDirectory, encoding: 'utf-8' })
 
   await downloadRubies(ccRubies.split(':'))
-  setupRakeCompilerConfig()
+  setupRakeCompilerConfig(workingDirectory)
 }
 
 async function downloadRubies(rubies) {
@@ -26,11 +26,11 @@ async function downloadRubies(rubies) {
   }
 }
 
-function setupRakeCompilerConfig() {
+function setupRakeCompilerConfig(workingDirectory) {
   let rubiesRbConfig = fs.globSync(`${rubiesPath()}/*/*/lib/ruby/*/*/rbconfig.rb`)
   let currentRubyVersion = cp.execSync('ruby -v', { encoding: 'utf-8' }).match(/^ruby (\d\.\d\.\d)/)[1]
   let rbConfigPath = path.join(os.homedir(), ".rake-compiler", "config.yml")
-  let rubyPlatform = cp.execSync('easy_compile print_normalized_platform', { encoding: 'utf-8' })
+  let rubyPlatform = cp.execSync('easy_compile print_normalized_platform', { cwd: workingDirectory, encoding: 'utf-8' })
 
   fs.mkdirSync(`${os.homedir()}/.rake-compiler`)
 

lib/easy_compile/compilation_tasks.rb

@@ -11,6 +11,7 @@ class CompilationTasks
 
     def initialize(create_packaging_task = false, gemspec = nil)
       @gemspec  = Bundler.load_gemspec(gemspec || find_gemspec)
+      verify_gemspec!
 
       @create_packaging_task = create_packaging_task
     end
@@ -126,5 +127,14 @@ def find_gemspec(glob = "*.gemspec")
         Make sure to run any easy_compile commands in the root of your gem folder.
       EOM
     end
+
+    def verify_gemspec!
+      return if gemspec.extensions.any?
+
+      raise GemspecError, <<~EOM
+        Your gem has no native extention defined in its gemspec.
+        This tool can't be used on pure Ruby gems.
+      EOM
+    end
   end
 end

test/cli_test.rb

@@ -122,11 +122,9 @@ def test_when_cli_runs_in_project_with_no_gemspec
       out = nil
 
       Dir.chdir("lib") do
-        Kernel.stub(:exit, ->(_) { raise }) do
-          out, _ = capture_subprocess_io do
-            assert_raises(StandardError) do
-              CLI.start(["print_ruby_cc_version"])
-            end
+        out, _ = capture_subprocess_io do
+          raise_instead_of_exit do
+            CLI.start(["print_ruby_cc_version"])
           end
         end
       end
@@ -136,5 +134,30 @@ def test_when_cli_runs_in_project_with_no_gemspec
         Make sure to run any easy_compile commands in the root of your gem folder.
       MSG
     end
+
+    def test_when_cli_runs_in_project_with_no_native_extension
+      out = nil
+
+      out, _ = capture_subprocess_io do
+        raise_instead_of_exit do
+          CLI.start(["print_ruby_cc_version"])
+        end
+      end
+
+      assert_equal(<<~MSG, out)
+        Your gem has no native extention defined in its gemspec.
+        This tool can't be used on pure Ruby gems.
+      MSG
+    end
+
+    private
+
+    def raise_instead_of_exit(&block)
+      Kernel.stub(:exit, ->(_) { raise }) do
+        assert_raises(StandardError) do
+          block.call
+        end
+      end
+    end
   end
 end