-(global): fixing the installation flow on windows

There could be a bug caused by the lack of SO_REUSEPORT

home/control_install.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"net/http"
 	"os/exec"
+	"runtime"
 	"strconv"
 
 	"github.com/AdguardTeam/golibs/log"
@@ -117,6 +118,10 @@ func handleInstallCheckConfig(w http.ResponseWriter, r *http.Request) {
 
 // Check if DNSStubListener is active
 func checkDNSStubListener() bool {
+	if runtime.GOOS != "linux" {
+		return false
+	}
+
 	cmd := exec.Command("systemctl", "is-enabled", "systemd-resolved")
 	log.Tracef("executing %s %v", cmd.Path, cmd.Args)
 	_, err := cmd.Output()

home/helpers.go

@@ -242,6 +242,10 @@ func checkPortAvailable(host string, port int) error {
 		return err
 	}
 	ln.Close()
+
+	// It seems that net.Listener.Close() doesn't close file descriptors right away.
+	// We wait for some time and hope that this fd will be closed.
+	time.Sleep(100 * time.Millisecond)
 	return nil
 }
 
@@ -251,6 +255,10 @@ func checkPacketPortAvailable(host string, port int) error {
 		return err
 	}
 	ln.Close()
+
+	// It seems that net.Listener.Close() doesn't close file descriptors right away.
+	// We wait for some time and hope that this fd will be closed.
+	time.Sleep(100 * time.Millisecond)
 	return err
 }
 

home/home.go

@@ -20,6 +20,8 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/AdguardTeam/AdGuardHome/isdelve"
+
 	"github.com/AdguardTeam/AdGuardHome/dhcpd"
 	"github.com/AdguardTeam/AdGuardHome/dnsfilter"
 	"github.com/AdguardTeam/AdGuardHome/dnsforward"
@@ -284,7 +286,8 @@ func httpServerLoop() {
 //  and if not, ask and try to run as root
 func requireAdminRights() {
 	admin, _ := haveAdminRights()
-	if admin {
+	if //noinspection ALL
+	admin || isdelve.Enabled {
 		return
 	}
 

isdelve/delve.go

@@ -0,0 +1,5 @@
+// +build delve
+
+package isdelve
+
+const Enabled = true

isdelve/doc.go

@@ -0,0 +1,3 @@
+// Package isdelve is for checking if we're debugging:
+// https://stackoverflow.com/questions/47879070/how-can-i-see-if-the-goland-debugger-is-running-in-the-program
+package isdelve

isdelve/nodelve.go

@@ -0,0 +1,5 @@
+// +build !delve
+
+package isdelve
+
+const Enabled = false