feat: silent start, stop and restart

cmd/common.go

@@ -1,8 +1,14 @@
 package cmd
 
 import (
+	"os"
+	"path/filepath"
+	"strconv"
+
 	"github.com/alist-org/alist/v3/internal/bootstrap"
 	"github.com/alist-org/alist/v3/internal/bootstrap/data"
+	"github.com/alist-org/alist/v3/pkg/utils"
+	log "github.com/sirupsen/logrus"
 )
 
 func Init() {
@@ -11,3 +17,27 @@ func Init() {
 	bootstrap.InitDB()
 	data.InitData()
 }
+
+var pid = -1
+var pidFile string
+
+func initDaemon() {
+	ex, err := os.Executable()
+	if err != nil {
+		log.Fatal(err)
+	}
+	exPath := filepath.Dir(ex)
+	_ = os.MkdirAll(filepath.Join(exPath, "daemon"), 0700)
+	pidFile = filepath.Join(exPath, "daemon/pid")
+	if utils.Exists(pidFile) {
+		bytes, err := os.ReadFile(pidFile)
+		if err != nil {
+			log.Fatal("failed to read pid file", err)
+		}
+		id, err := strconv.Atoi(string(bytes))
+		if err != nil {
+			log.Fatal("failed to parse pid data", err)
+		}
+		pid = id
+	}
+}