為什么以下使用 cobra 包的 CLI 程序在運(yùn)行時(shí)會(huì)拋出堆棧溢出錯(cuò)誤go run /tmp/test.go branch leaf，但當(dāng)葉子命令直接連接到 root 時(shí)不會(huì)出錯(cuò)（如主函數(shù)中所述）？這表明我沒(méi)有正確使用 cobra PersistenRun* 功能。我對(duì) PersistenRun* 函數(shù)的理解是它們僅適用于命令的子級(jí)。問(wèn)題似乎是命令的父級(jí)已以某種方式設(shè)置為命令本身。package mainimport (        "fmt"        "os"        "path"        "github.com/spf13/cobra")var programName = path.Base(os.Args[0])var rootCmd = &cobra.Command{        Use: programName,        PersistentPreRun: func(cmd *cobra.Command, args []string) {                fmt.Println("in root pre run")        },}var branchCmd = &cobra.Command{        Use: "branch",        PersistentPreRun: func(cmd *cobra.Command, args []string) {                cmd.Parent().PersistentPreRun(cmd, args)                fmt.Println("in branch pre run")        },}var leafCmd = &cobra.Command{        Use: "leaf",        PersistentPreRun: func(cmd *cobra.Command, args []string) {                cmd.Parent().PersistentPreRun(cmd, args)                fmt.Println("in leaf pre run")        },        Run: func(cmd *cobra.Command, args []string) {                fmt.Println("in leaf run")        },}func main() {        branchCmd.AddCommand(leafCmd)        rootCmd.AddCommand(branchCmd)        rootCmd.Execute()        // If I connect the root to the leaf directly, like the following, then        // the program no longer stack overflow        // rootCmd.AddCommand(leafCmd)        // rootCmd.Execute()}