Add flag to specify ip cache file

ip-checker/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	_ "embed"
+	"flag"
 	"fmt"
 	"io"
 	"log"
@@ -38,19 +39,21 @@ func init() {
 var oldIP, newIP string
 
 const REMOTE_URL = "http://141.147.53.95:5000"
-const IP_FILE = "ip"
 
 var ipFile *os.File
 var lastMailed time.Time
 
 func main() {
+	ipfile := flag.String("ipfile", "ip", "file to store ip in")
+	flag.Parse()
+
 	var err error
 	envvar, err = godotenv.Parse(strings.NewReader(env))
 	if err != nil {
 		Error.Fatalf("Error parsing .env file: %v", err)
 		os.Exit(1)
 	}
-	ipFile, err = os.OpenFile(IP_FILE, os.O_RDWR|os.O_CREATE, 0644)
+	ipFile, err = os.OpenFile(*ipfile, os.O_RDWR|os.O_CREATE, 0644)
 	if err != nil {
 		Error.Fatalf("Error opening IP file: %v", err)
 		os.Exit(1)