# Remove some system services that don't make sense in live sessions.
# The user can add more items by declaring space separated RM_SYSTEM_SERVICES
# or RM_THIN_SYSTEM_SERVICES lists in lts.conf.
# The RM_THIN_SYSTEM_SERVICES list is ignored by fat clients.
# KEEP_SYSTEM_SERVICES is a space separated whitelist of services.

allowed_services() {
    local service

    echo "$@" | sed 's/#.*//' | while read service; do
        case " $KEEP_SYSTEM_SERVICES " in
            *" $service "*)
                ;;
            *)
                echo -n " $service"
                ;;
        esac
    done
}

# $RM_SYSTEM_SERVICES are removed for all clients
rm_services="$(allowed_services "$RM_SYSTEM_SERVICES
alsa-restore          # Restore sound card(s') mixer state(s)
alsa-store            # Save sound card(s') mixer state(s)
dnsmasq               # A lightweight DHCP and caching DNS server
exim4                 # exim4 Mail Transport Agent
grub-common           # Record successful boot for GRUB
lightdm               # Light Display Manager
lvm2-lvmetad          # LVM2 metadata daemon
mdadm                 # MD monitoring daemon
ModemManager          # Modem manager
modemmanager          # Modem manager (older versions)
nbd-client            # Network Block Device client (we use nbd-disconnect)
nbd-server            # Network Block Device server
plymouth-stop         # Hide the splash screen
rfkill-store          # Store software rfkill state
shared-folders        # Shared folders service
ssh                   # OpenSSH server
tty2                  # Getty
tty3                  # Getty
tty4                  # Getty
tty5                  # Getty
tty6                  # Getty
unattended-upgrades   # Check if unattended upgrades are being applied
urandom               # Save and restore random seed between restarts
x2goserver            # X2Go daemon responsible for post-session clean-ups
")"

# $RM_THIN_SYSTEM_SERVICES are removed for thin clients
if ! boolean_is_true "$LTSP_FATCLIENT"; then
    rm_services="$rm_services $(allowed_services "$RM_THIN_SYSTEM_SERVICES
accounts-daemon       # Accounts Service
acpid                 # ACPI daemon
apparmor              # AppArmor initialization
apport                # Automatic crash report generation
atd                   # Deferred execution scheduler
avahi-daemon          # mDNS/DNS-SD daemon
bluetooth             # Bluetooth daemon
brltty                # Braille terminal driver
cgmanager             # Cgroup management daemon
cups                  # CUPS Printing spooler and server
cups-browsed          # CUPS browse daemon
kerneloops            # Collects and submits kernel crash signatures
network-manager       # Network connection manager
NetworkManager        # Network Manager
NetworkManager-wait-online        # Network Manager Wait Online
NetworkManager-script-dispatcher  # Network Manager Script Dispatcher Service
polkitd               # Authenticate and Authorize Users to Run Privileged Tasks
systemd-logind        # Login Service
teamviewerd           # TeamViewer remote control daemon
ufw                   # Uncomplicated Firewall
upstart-socket-bridge # Bridge socket events into upstart
virtualbox            # VirtualBox Linux kernel module
vboxweb               # VirtualBox Web Service
whoopsie              # crash report submission daemon
wpa_supplicant        # WPA supplicant
")"

    # For low RAM thin clients, disable whatever isn't essential for booting
    memtotal=$(awk '/^MemTotal:/ { print int($2/1024) }' /proc/meminfo)
    RM_RAM_THRESHOLD=${RM_RAM_THRESHOLD:-200}
    if [ "$memtotal" -le "$RM_RAM_THRESHOLD" ]; then
        rm_services="$rm_services $(allowed_services "$RM_LOW_RAM_SERVICES
anacron               # anac(h)ronistic cron
#dbus                  # D-Bus system message bus - systemd depends on it
cron                  # Regular background program processing daemon
getty@                # Getty on %I
rsyslog               # System logging daemon
tty1                  # Getty
upstart-udev-bridge   # Bridge udev events into upstart
")"
    fi
fi

# We don't need NFS-related services if we're not using nfs
if ! grep -q nfs /etc/fstab; then
    rm_services="$rm_services $(allowed_services "
gssd                  # rpcsec_gss daemon
idmapd                # NFSv4 id <-> name mapper
nfs-blkmap            # pNFS block layout mapping daemon
nfs-kernel-server     # Kernel NFS server support
nfs-mountd            # NFS Mount Daemon
nfs-server            # NFS server and services
nfs-utils             # NFS server and client services
statd                 # NSM status monitor
")"
fi

for service in $rm_services; do
    rm -f /etc/rc?.d/???"$service" "/etc/init.d/$service" "/etc/init/$service.conf" "/lib/systemd/system/$service."* "/etc/systemd/system/$service."*
done