package main

import (
        "fmt"
        "strings"

        "github.com/go-piv/piv-go/v2/piv"
)

func main() {
        cards, err := piv.Cards()
        if err != nil {
                fmt.Printf("%v", err)
                return
        }

        // Find a YubiKey and open the reader.
        var yk *piv.YubiKey
        for _, card := range cards {
                if strings.Contains(strings.ToLower(card), "yubikey") {
                        if yk, err = piv.Open(card); err != nil {
                                fmt.Printf("%v", err)
                                return
                        }
                        break
                }
        }
        if yk != nil {
                _, err := yk.KeyInfo(piv.SlotSignature)
                if err != nil {
                        fmt.Println(err)
                }
                _, err = yk.Attest(piv.SlotSignature)
                if errors.Is(err, piv.ErrNotFound) {
                        fmt.Println(err)
                }
        }
}

$ ykman piv reset
$ ./main
command failed: smart card error 6a88: referenced data or reference data not found
data object or application not found