cluster/pd: implement PDScaleScript.ConfigToFile

pkg/cluster/template/scripts/pd.go

@@ -149,3 +149,12 @@ func NewPDScaleScript(pdScript *PDScript) *PDScaleScript {
 func (c *PDScaleScript) Config() ([]byte, error) {
 	return c.configWithScript("run_pd_scale.sh.tpl")
 }
+
+// ConfigToFile write config content to specific path
+func (c *PDScaleScript) ConfigToFile(file string) error {
+	config, err := c.Config()
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(file, config, 0755)
+}

pkg/cluster/template/scripts/pd_test.go

@@ -13,6 +13,8 @@
 package scripts
 
 import (
+	"os"
+	"path"
 	"strings"
 	"testing"
 
@@ -26,16 +28,35 @@ var _ = Suite(&pdSuite{})
 func Test(t *testing.T) { TestingT(t) }
 
 func (s *pdSuite) TestScaleConfig(c *C) {
+	confDir, err := os.MkdirTemp("", "tiup-*")
+	c.Assert(err, IsNil)
+	defer os.RemoveAll(confDir)
+
+	conf := path.Join(confDir, "pd0.conf")
 	pdScript := NewPDScript("pd", "1.1.1.1", "/home/deploy/pd-2379", "/home/pd-data", "/home/pd-log")
 	pdConfig, err := pdScript.Config()
 	c.Assert(err, IsNil)
 	c.Assert(strings.Contains(string(pdConfig), "--initial-cluster"), IsTrue)
 	c.Assert(strings.Contains(string(pdConfig), "--join"), IsFalse)
 
+	err = pdScript.ConfigToFile(conf)
+	c.Assert(err, IsNil)
+	content, err := os.ReadFile(conf)
+	c.Assert(err, IsNil)
+	c.Assert(strings.Contains(string(content), "--initial-cluster"), IsTrue)
+	c.Assert(strings.Contains(string(content), "--join"), IsFalse)
+
 	scScript := NewPDScaleScript(pdScript)
 	scConfig, err := scScript.Config()
 	c.Assert(err, IsNil)
 	c.Assert(pdConfig, Not(DeepEquals), scConfig)
 	c.Assert(strings.Contains(string(scConfig), "--initial-cluster"), IsFalse)
 	c.Assert(strings.Contains(string(scConfig), "--join"), IsTrue)
+
+	err = scScript.ConfigToFile(conf)
+	c.Assert(err, IsNil)
+	content, err = os.ReadFile(conf)
+	c.Assert(err, IsNil)
+	c.Assert(strings.Contains(string(content), "--initial-cluster"), IsFalse)
+	c.Assert(strings.Contains(string(content), "--join"), IsTrue)
 }