cobra PersistentPreRun 堆栈溢出

Question

为什么以下使用 cobra 包的 CLI 程序在运行和 go run /tmp/test.go branch leaf 时抛出堆栈溢出错误，但当 leaf 子命令直接连接到 root 时不会出错（如评论主要功能)?

这表明我没有正确使用 cobra PersistenRun* 函数。我对 PersistenRun* 函数的理解是它们仅适用于命令的子项。问题似乎是某个命令的父项已以某种方式设置为该命令本身。

package main

import (
        "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()
}

Answer 1

NVM，我想通了。

代替

       PersistentPreRun: func(cmd *cobra.Command, args []string) {
                cmd.Parent().PersistentPreRun(cmd, args)
                fmt.Println("in * pre run")
       },

应该是：

       PersistentPreRun: func(cmd *cobra.Command, args []string) {
                cmd.Parent().PersistentPreRun(cmd.Parent(), args)
                fmt.Println("in * pre run")
       },

cobra PersistentPreRun 堆栈溢出

cobra PersistentPreRun stack overflow

go

go-cobra