feat: add native lib path function (#376)

feat: add native lib path function

installer/installer.go

@@ -23,6 +23,16 @@ import (
 	"github.com/spf13/afero"
 )
 
+// NativeLibPath returns the absolute path to the go package used to link to the native rust library
+func NativeLibPath() string {
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		return ""
+	}
+	pactRoot := filepath.Dir(filepath.Dir(file))
+	return filepath.Join(pactRoot, "internal", "native")
+}
+
 // Installer is used to check the Pact Go installation is setup correctly, and can automatically install
 // packages if required
 type Installer struct {

installer/installer_test.go

@@ -4,12 +4,23 @@ package installer
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/spf13/afero"
 	"github.com/stretchr/testify/assert"
 )
 
+func TestNativeLibPath(t *testing.T) {
+	lib := NativeLibPath()
+
+	libFilePath := filepath.Join(lib, "lib.go")
+	file, err := os.ReadFile(libFilePath)
+	assert.NoError(t, err)
+	assert.Contains(t, string(file), "-lpact_ffi")
+}
+
 // 1. Be able to specify the path of the binary in advance
 // 2. Check if the correct versions of the libs are present???
 // 3. Download the appropriate libs