fix(PL-2763): check chart has been written before deciding to pull

internal/generator/generator.go

@@ -3,7 +3,9 @@ package generator
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
+	"os"
 	"sync"
 
 	"github.com/rs/zerolog"
@@ -59,6 +61,14 @@ func (puller ChartPuller) Pull(ctx context.Context, opts helm.PullOptions) error
 	mutex.Lock()
 	defer mutex.Unlock()
 
+	if _, err := os.Stat(opts.OutputDir); err == nil {
+		// If output directory exists it has been pulled by another goroutine
+		// No need to pull the chart
+		return nil
+	} else if !errors.Is(err, os.ErrNotExist) {
+		return fmt.Errorf("failed to stat chart cache: %w", err)
+	}
+
 	if err := cli.Pull(ctx, opts); err != nil {
 		return fmt.Errorf("%w: %q", err, &buffer)
 	}