[优化] go 引用调整

openflare-server/service/update_restart_unix.go

@@ -0,0 +1,73 @@
+//go:build !windows
+
+package service
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"syscall"
+)
+
+var unixRename = os.Rename
+
+func replaceAndRestartServer(execPath string, tmpPath string) error {
+	backupPath := execPath + ".bak"
+	_ = os.Remove(backupPath)
+	if err := unixRename(execPath, backupPath); err != nil {
+		_ = os.Remove(tmpPath)
+		return fmt.Errorf("备份当前服务端二进制失败: %w", err)
+	}
+	if err := replaceFileUnix(tmpPath, execPath); err != nil {
+		_ = unixRename(backupPath, execPath)
+		return fmt.Errorf("替换服务端二进制失败: %w", err)
+	}
+	_ = os.Remove(backupPath)
+	if err := syscall.Exec(execPath, os.Args, os.Environ()); err != nil {
+		return fmt.Errorf("重启服务失败: %w", err)
+	}
+	return fmt.Errorf("unreachable after exec")
+}
+
+func replaceFileUnix(srcPath string, dstPath string) error {
+	if err := unixRename(srcPath, dstPath); err == nil {
+		return nil
+	} else if linkErr, ok := err.(*os.LinkError); !ok || linkErr.Err != syscall.EXDEV {
+		return err
+	}
+
+	sourceFile, err := os.Open(srcPath)
+	if err != nil {
+		return err
+	}
+	defer sourceFile.Close()
+
+	info, err := sourceFile.Stat()
+	if err != nil {
+		return err
+	}
+
+	destinationFile, err := os.OpenFile(dstPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, info.Mode().Perm())
+	if err != nil {
+		return err
+	}
+
+	copyErr := func() error {
+		defer destinationFile.Close()
+		if _, err = io.Copy(destinationFile, sourceFile); err != nil {
+			return err
+		}
+		if err = destinationFile.Sync(); err != nil {
+			return err
+		}
+		return nil
+	}()
+	if copyErr != nil {
+		return copyErr
+	}
+
+	if err = os.Chmod(dstPath, info.Mode().Perm()); err != nil {
+		return err
+	}
+	return os.Remove(srcPath)
+}