feat: add yarn berry support

src/nodejs/supply/supply.go

@@ -46,6 +46,7 @@ type NPM interface {
 
 type Yarn interface {
 	Build(string, string) error
+	Rebuild(string, string) error
 }
 
 type Stager interface {
@@ -315,18 +316,26 @@ func (s *Supplier) BuildDependencies() error {
 		return err
 	}
 
+	if (s.IsVendored) {
+		s.Log.Info("Prebuild detected (node_modules already exists)")
+		switch {
+		case s.UseYarn:
+			if err := s.Yarn.Rebuild(s.Stager.BuildDir(), s.Stager.CacheDir()); err != nil {
+				return err;
+			}
+		default:
+			if err := s.NPM.Rebuild(s.Stager.BuildDir()); err != nil {
+				return err
+			}
+		}
+	}
+
 	switch {
 	case s.UseYarn:
 		if err := s.Yarn.Build(s.Stager.BuildDir(), s.Stager.CacheDir()); err != nil {
 			return err
 		}
 
-	case s.IsVendored:
-		s.Log.Info("Prebuild detected (node_modules already exists)")
-		if err := s.NPM.Rebuild(s.Stager.BuildDir()); err != nil {
-			return err
-		}
-
 	default:
 		if err := s.NPM.Build(s.Stager.BuildDir(), s.Stager.CacheDir()); err != nil {
 			return err

src/nodejs/yarn/yarn.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strings"
 
 	"github.com/cloudfoundry/libbuildpack"
 )
@@ -22,6 +23,80 @@ type Yarn struct {
 func (y *Yarn) Build(buildDir, cacheDir string) error {
 	y.Log.Info("Installing node modules (yarn.lock)")
 
+	err := y.doBuild(buildDir, cacheDir);
+
+	if err != nil {
+		return err
+	}
+
+	return nil;
+}
+
+func (y *Yarn) Rebuild(buildDir, cacheDir string) error {
+	y.Log.Info("Rebuilding native dependencies")
+
+	err := y.doBuild(buildDir, cacheDir);
+
+	if err != nil {
+		return err
+	}
+
+	return nil;
+}
+
+func (y *Yarn) doBuild(buildDir, cacheDir string) error {
+	yarnVersion, err := y.getYarnVersion(buildDir)
+	if err != nil {
+		return err
+	}
+
+	if strings.HasPrefix(yarnVersion, "1") {
+		return y.doBuildClassic(buildDir, cacheDir)
+	}
+
+	return y.doBuildBerry(buildDir)
+}
+
+func (y *Yarn) getYarnVersion(buildDir string) (string, error) {
+	cmd := exec.Command("yarn", "--version")
+	cmd.Dir = buildDir
+	cmd.Stdout = y.Log.Output()
+	cmd.Stderr = y.Log.Output()
+	cmd.Env = append(os.Environ(), "npm_config_nodedir="+os.Getenv("NODE_HOME"))
+
+	versionOutput, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	yarnVersion := strings.TrimSpace(string(versionOutput))
+	return yarnVersion, nil
+}
+
+func (y *Yarn) isYarnLocalCacheEnabled(buildDir string) (bool, error) {
+	cmd := exec.Command("yarn", "config", "get", "enableGlobalCache")
+	cmd.Dir = buildDir
+	cmd.Stdout = y.Log.Output()
+	cmd.Stderr = y.Log.Output()
+	cmd.Env = append(os.Environ(), "npm_config_nodedir="+os.Getenv("NODE_HOME"))
+
+	cacheStrategyOutput, err := cmd.Output()
+	if err != nil {
+		return false, err
+	}
+
+	yarnCacheStrategy := strings.TrimSpace(string(cacheStrategyOutput))
+
+	if yarnCacheStrategy == "false" {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (y *Yarn) doBuildClassic(buildDir, cacheDir string) error {
+	// Start by informing users that Yarn v1 is deprecated and they should upgrade to Yarn v4 (Berry)
+	y.Log.Protip("Yarn v1 is deprecated and has been replaced with Yarn Berry by the Yarn organisation. Please upgrade to Yarn v4 (Berry) to avoid future deprecation warnings.", "https://yarnpkg.com/migration/guide")
+
 	offline, err := libbuildpack.FileExists(filepath.Join(buildDir, "npm-packages-offline-cache"))
 	if err != nil {
 		return err
@@ -41,7 +116,7 @@ func (y *Yarn) Build(buildDir, cacheDir string) error {
 		yarnConfig["yarn-offline-mirror-pruning"] = "false"
 	} else {
 		y.Log.Info("Running yarn in online mode")
-		y.Log.Info("To run yarn in offline mode, see: https://yarnpkg.com/blog/2016/11/24/offline-mirror")
+		y.Log.Info("To run yarn in offline mode, see: https://classic.yarnpkg.com/blog/2016/11/24/offline-mirror/")
 
 		yarnConfig["yarn-offline-mirror"] = filepath.Join(cacheDir, "npm-packages-offline-cache")
 		yarnConfig["yarn-offline-mirror-pruning"] = "true"
@@ -73,3 +148,32 @@ func (y *Yarn) Build(buildDir, cacheDir string) error {
 
 	return nil
 }
+
+func (y *Yarn) doBuildBerry(buildDir string) error {
+	usesLocalCache, err := y.isYarnLocalCacheEnabled(buildDir)
+	if err != nil {
+		return err
+	}
+
+	installArgs := []string{"install", "--immutable"}
+
+	if usesLocalCache {
+		installArgs = append(installArgs, "--immutable-cache")
+	}
+
+	cmd := exec.Command("yarn", installArgs...)
+	cmd.Dir = buildDir
+	cmd.Stdout = y.Log.Output()
+	cmd.Stderr = y.Log.Output()
+	cmd.Env = append(os.Environ(), "npm_config_nodedir="+os.Getenv("NODE_HOME"))
+	if err := y.Command.Run(cmd); err != nil {
+		return err
+	}
+
+	err = os.RemoveAll(filepath.Join(buildDir, ".yarn/cache"))
+	if err != nil {
+		panic(err)
+	}
+
+	return nil
+}