Comment important settings in the pihole-FTL.service file

Signed-off-by: Orazio <22700499+orazioedoardo@users.noreply.github.com>

advanced/Templates/pihole-FTL.systemd

@@ -19,6 +19,7 @@ StartLimitIntervalSec=60s
 User=pihole
 PermissionsStartOnly=true
 AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_RAW CAP_NET_ADMIN CAP_SYS_NICE CAP_IPC_LOCK CAP_CHOWN
+# Prevents the pihole-FTL process from acquiring more capabilities then the following
 CapabilityBoundingSet=CAP_NET_BIND_SERVICE CAP_NET_RAW CAP_NET_ADMIN CAP_SYS_NICE CAP_IPC_LOCK CAP_CHOWN
 
 ExecStartPre=/opt/pihole/pihole-FTL-prestart.sh
@@ -31,13 +32,18 @@ ExecStopPost=/opt/pihole/pihole-FTL-poststop.sh
 # Use graceful shutdown with a reasonable timeout
 TimeoutStopSec=10s
 
+# Let the pihole-FTL process see a read-only view of /opt/pihole when TemporaryFileSystem= is
+# hiding the content of /opt
 BindReadOnlyPaths=/opt/pihole
+# Gives access to /etc/pihole
 ConfigurationDirectory=pihole
 LockPersonality=true
+# Gives access to /var/log/pihole
 LogsDirectory=pihole
 NoNewPrivileges=true
 PrivateDevices=true
 PrivateIPC=true
+# Gives pihole-FTL a private (0700), not shared, per-execution, tmp folder
 PrivateTmp=true
 ProtectClock=true
 ProtectControlGroups=true
@@ -46,17 +52,23 @@ ProtectHostname=true
 ProtectKernelLogs=true
 ProtectKernelModules=true
 ProtectKernelTunables=true
+# Hides processes owned by other users from pihole-FTL view
 ProtectProc=invisible
+# Mount the entire file system as read-only. Write access to required folders is provided via
+# {Configuration,Logs,Runtime}Directory= settings
 ProtectSystem=strict
 RemoveIPC=true
 RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
 RestrictNamespaces=true
 RestrictRealtime=true
 RestrictSUIDSGID=true
+# Gives access to /run/pihole, cleared when service is stopped
 RuntimeDirectory=pihole
 SystemCallArchitectures=native
 SystemCallFilter=@system-service
+# Blacklist using the '~' character the @privileged syscall set
 SystemCallFilter=~@privileged
+# Hides the content of the following folders, which may contain user data, from pihole-FTL view
 TemporaryFileSystem=/media /mnt /opt /run /srv /var
 
 [Install]