Pull request: 3450 fix install script

Merge in DNS/adguard-home from 3450-install-script to master

Closes #3450.

Squashed commit of the following:

commit ab28d0b2bf7fca0fb292f250b728ae6214a75829
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Mon Aug 16 19:00:03 2021 +0300

    scripts: fix install

CHANGELOG.md

@@ -65,6 +65,7 @@ and this project adheres to
 
 ### Fixed
 
+- Inaccurate using of service actions in the installation script ([#3450]).
 - Client ID checking ([#3437]).
 - Discovering other DHCP servers on `darwin` and `freebsd` ([#3417]).
 - Switching listening address to unspecified one when bound to a single
@@ -126,6 +127,7 @@ and this project adheres to
 [#3417]: https://github.com/AdguardTeam/AdGuardHome/issues/3417
 [#3435]: https://github.com/AdguardTeam/AdGuardHome/issues/3435
 [#3437]: https://github.com/AdguardTeam/AdGuardHome/issues/3437
+[#3450]: https://github.com/AdguardTeam/AdGuardHome/issues/3450
 
 
 

scripts/install.sh

@@ -474,10 +474,10 @@ handle_existing() {
 		if [ "$reinstall" -ne '1' ] && [ "$uninstall" -ne '1' ]
 		then
 			error_exit \
-"to reinstall/uninstall the AdGuard Home using\this script specify one of the '-r' or '-u' flags"
+"to reinstall/uninstall the AdGuard Home using this script specify one of the '-r' or '-u' flags"
 		fi
 
-		if ( cd "$agh_dir" && ! ./AdGuardHome -s uninstall )
+		if ( cd "$agh_dir" && ! ./AdGuardHome -s stop || ! ./AdGuardHome -s uninstall )
 		then
 			# It doesn't terminate the script since it is possible
 			# that AGH just not installed as service but appearing
@@ -498,9 +498,11 @@ handle_existing() {
 
 # Function install_service tries to install AGH as service.
 install_service() {
+	# Installing as root is required at least on FreeBSD.
+	#
 	# TODO(e.burkov): Think about AGH's output suppressing with no verbose
 	# flag.
-	if ( cd "$agh_dir" && ./AdGuardHome -s install )
+	if ( cd "$agh_dir" && $sudo_cmd ./AdGuardHome -s install )
 	then
 		return 0
 	fi