it turned out to be an error misjudgement. The real line that caused
trouble is this:
s = er.Error()+string(out)
The error is gone after I changed it to this line :
s = fmt.Sprintf("%v %s", er, out)
On Fri, Jun 6, 2025 at 6:29 PM Zhaoxun Yan <yan.zhao...@gmail.com> wrote:
> --------------------
> panic: runtime error: invalid memory address or nil pointer dereference
> [signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x6646f2]
>
> goroutine 1 [running]:
> util.CommandArgs({0xc000093cb0?, 0x2?, 0xc000071380?})
> /home/zxun/src/util/util.go:49 +0xf2
> --------------------
> This error occurred because package [main] uses a function called
> "CommandArgs" from my self-built package [util] with args in another
> package [conf] in the same directory. Package [util] got lost because it
> does not know where is package [conf]
> like this
> [util] /home/zxun/src/util.go
> [conf] /home/zxun/src/conf.go
> [main] /home/zxun/src/main.go...
> /home/zxun/src/go.mod:
>
> require(
> util v0.0.0
> ...
> replace util => ../util
>
> The usage line in main.go:
> fmt.Println( util.CommandArgs([]string{conf.IreportExec,
> conf.IreportScript, "redis"}) )
>
> util.CommandArgs:
>
> func CommandArgs(args []string) string{
> if len(args) ==0{
> return "args are empty！"
> }
> var s string
> if len(args) ==1{
> out, er := exec.Command(args[0]).CombinedOutput()
> s = er.Error()+string(out)
> }else{
> out, er := exec.Command(args[0],args[1:]...).CombinedOutput()
> s = er.Error()+string(out)
> fmt.Println(s)
> }
> return s
> }
>
> So is my analysis correct? I have not seen s printed yet, because s shall
> include "<nil>" at the beginning. I am using go1.18. If the cause is util
> package cannot access a variable in conf, is it possible to walk around by
> a deepcopy of the string array (which will be in package main)?
>
> Thanks in advance.
>
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