Pull request 1870: nextapi-frontend-fs

Merge in DNS/adguard-home from nextapi-frontend-fs to master

Squashed commit of the following:

commit 3ed959f21939cf5590c27426af46906cbffed502
Merge: e60bbdd04 9fda7bfd3
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Jun 13 13:37:00 2023 +0300

    Merge branch 'master' into nextapi-frontend-fs

commit e60bbdd04ce841c1aaaa198cc9dc85ae14799ffa
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Jun 9 14:53:09 2023 +0300

    next: support frontend fs

internal/next/cmd/signal.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"io/fs"
 	"os"
 	"time"
 
@@ -18,6 +19,10 @@ type signalHandler struct {
 	// confFile is the path to the configuration file.
 	confFile string
 
+	// frontend is the filesystem with the frontend and other statically
+	// compiled files.
+	frontend fs.FS
+
 	// start is the time at which AdGuard Home has been started.
 	start time.Time
 
@@ -58,16 +63,16 @@ func (h *signalHandler) reconfigure() {
 	// reconfigured without the full shutdown, and the error handling is
 	// currently not the best.
 
-	confMgr, err := configmgr.New(h.confFile, h.start)
-	fatalOnError(err)
+	confMgr, err := configmgr.New(h.confFile, h.frontend, h.start)
+	check(err)
 
 	web := confMgr.Web()
 	err = web.Start()
-	fatalOnError(err)
+	check(err)
 
 	dns := confMgr.DNS()
 	err = dns.Start()
-	fatalOnError(err)
+	check(err)
 
 	h.services = []agh.Service{
 		dns,
@@ -103,10 +108,16 @@ func (h *signalHandler) shutdown() (status int) {
 }
 
 // newSignalHandler returns a new signalHandler that shuts down svcs.
-func newSignalHandler(confFile string, start time.Time, svcs ...agh.Service) (h *signalHandler) {
+func newSignalHandler(
+	confFile string,
+	frontend fs.FS,
+	start time.Time,
+	svcs ...agh.Service,
+) (h *signalHandler) {
 	h = &signalHandler{
 		signal:   make(chan os.Signal, 1),
 		confFile: confFile,
+		frontend: frontend,
 		start:    start,
 		services: svcs,
 	}