+ app: disable new version check and auto-update by command line switch

AGHTechDoc.md

@@ -256,6 +256,12 @@ Response:
 
 If `can_autoupdate` is true, then the server can automatically upgrade to a new version.
 
+Response with empty body:
+
+	200 OK
+
+It means that update check is disabled by user.  UI should do nothing.
+
 
 ### Update command
 

app.go

@@ -79,6 +79,7 @@ func run(args options) {
 		log.Info("AdGuard Home is running as a service")
 	}
 	config.runningAsService = args.runningAsService
+	config.disableUpdate = args.disableUpdate
 
 	config.firstRun = detectFirstRun()
 	if config.firstRun {
@@ -408,6 +409,7 @@ type options struct {
 	logFile        string // Path to the log file. If empty, write to stdout. If "syslog", writes to syslog
 	pidFile        string // File name to save PID to
 	checkConfig    bool   // Check configuration and exit
+	disableUpdate  bool   // If set, don't check for updates
 
 	// service control action (see service.ControlAction array + "status" command)
 	serviceControlAction string
@@ -446,6 +448,7 @@ func loadOptions() options {
 		}, nil},
 		{"pidfile", "", "Path to a file where PID is stored", func(value string) { o.pidFile = value }, nil},
 		{"check-config", "", "Check configuration and exit", nil, func() { o.checkConfig = true }},
+		{"no-check-update", "", "Don't check for updates", nil, func() { o.disableUpdate = true }},
 		{"verbose", "v", "Enable verbose output", nil, func() { o.verbose = true }},
 		{"help", "", "Print this help", nil, func() {
 			printHelp()

config.go

@@ -39,6 +39,7 @@ type configuration struct {
 	firstRun          bool   // if set to true, don't run any services except HTTP web inteface, and serve only first-run html
 	// runningAsService flag is set to true when options are passed from the service runner
 	runningAsService bool
+	disableUpdate    bool // If set, don't check for updates
 
 	BindHost     string `yaml:"bind_host"`     // BindHost is the IP address of the HTTP server to bind to
 	BindPort     int    `yaml:"bind_port"`     // BindPort is the port the HTTP server

control_update.go

@@ -52,6 +52,11 @@ func getVersionResp(data []byte) []byte {
 func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
 	log.Tracef("%s %v", r.Method, r.URL)
 
+	if config.disableUpdate {
+		log.Tracef("New app version check is disabled by user")
+		return
+	}
+
 	now := time.Now()
 	controlLock.Lock()
 	cached := now.Sub(versionCheckLastTime) <= versionCheckPeriod && len(versionCheckJSON) != 0