cmd/pkgserver: specify full addr string in flag

This allows greater flexibility.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/pkgserver/main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"context"
 	"errors"
-	"fmt"
 	"log"
 	"net/http"
 	"os"
@@ -24,7 +23,7 @@ func main() {
 
 	var (
 		flagBaseDir string
-		flagPort    int
+		flagAddr    string
 	)
 
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
@@ -68,15 +67,15 @@ func main() {
 		}
 		uiRoutes(http.DefaultServeMux)
 		apiRoutes(http.DefaultServeMux, &index)
-		return http.ListenAndServe(fmt.Sprintf(":%d", flagPort), nil)
+		return http.ListenAndServe(flagAddr, nil)
 	}).Flag(
 		&flagBaseDir,
 		"b", command.StringFlag(""),
 		"base directory for cache",
 	).Flag(
-		&flagPort,
-		"p", command.IntFlag(8067),
-		"http listen port",
+		&flagAddr,
+		"addr", command.StringFlag(":8067"),
+		"TCP network address to listen on",
 	)
 	c.MustParse(os.Args[1:], func(e error) {
 		log.Fatal(e)