Pull request: 5431 Privileged install

Merge in DNS/adguard-home from 5431-sudo-install to master

Updates AdguardTeam#5431.

Squashed commit of the following:

commit 4dc9d8d
Merge: 29b3d8e be43ce1
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 16 17:46:33 2023 +0300

    Merge branch 'master' into 5431-sudo-install

commit 29b3d8e
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 16 17:31:43 2023 +0300

    scripts: fix code

commit 4354e20
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 16 17:11:48 2023 +0300

    scripts: imp code

commit 4953b76
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 16 16:50:16 2023 +0300

    scripts: add sudo to freebsd service install

CHANGELOG.md

@@ -23,6 +23,12 @@ See also the [v0.107.25 GitHub milestone][ms-v0.107.25].
 NOTE: Add new changes BELOW THIS COMMENT.
 -->
 
+### Fixed
+
+- Failing service installation via script on FreeBSD ([#5431]).
+
+[#5431]: https://github.com/AdguardTeam/AdGuardHome/issues/5431
+
 <!--
 NOTE: Add new changes ABOVE THIS COMMENT.
 -->

scripts/install.sh

@@ -33,6 +33,19 @@ usage() {
 	exit 2
 }
 
+# Function maybe_sudo runs passed command with root privileges if use_sudo isn't
+# equal to 0.
+#
+# TODO(e.burkov):  Use everywhere the sudo_cmd isn't quoted.
+maybe_sudo() {
+	if [ "$use_sudo" -eq 0 ]
+	then
+		"$@"
+	else
+		"$sudo_cmd" "$@"
+	fi
+}
+
 # Function is_command checks if the command exists on the machine.
 is_command() {
 	command -v "$1" >/dev/null 2>&1
@@ -554,7 +567,14 @@ handle_existing() {
 
 # Function install_service tries to install AGH as service.
 install_service() {
-	if ( cd "$agh_dir" && ./AdGuardHome -s install )
+	# Installing the service as root is required at least on FreeBSD.
+	use_sudo='0'
+	if [ "$os" = 'freebsd' ]
+	then
+		use_sudo='1'
+	fi
+
+	if ( cd "$agh_dir" && maybe_sudo ./AdGuardHome -s install )
 	then
 		return 0
 	fi