Make lotus wallet import respect sigint

Make `lotus wallet import` respect sigint

cli/wallet.go

@@ -7,7 +7,9 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"os/signal"
 	"strings"
+	"syscall"
 
 	"github.com/urfave/cli/v2"
 	"golang.org/x/term"
@@ -335,6 +337,20 @@ var walletImport = &cli.Command{
 		if !cctx.Args().Present() || cctx.Args().First() == "-" {
 			if term.IsTerminal(int(os.Stdin.Fd())) {
 				fmt.Print("Enter private key(not display in the terminal): ")
+
+				// Create a channel to receive OS signals
+				sigCh := make(chan os.Signal, 1)
+				// Notify the channel when SIGINT is received
+				signal.Notify(sigCh, syscall.SIGINT)
+
+				go func() {
+					// Wait for SIGINT signal
+					<-sigCh
+					// Perform cleanup or other actions as needed
+					fmt.Println("\nInterrupt signal received. Exiting...")
+					os.Exit(1)
+				}()
+
 				inpdata, err = term.ReadPassword(int(os.Stdin.Fd()))
 				if err != nil {
 					return err