Install earlyoom at gce instance startup

net/scripts/install-earlyoom.sh

@@ -1,32 +1,30 @@
-#!/bin/bash -x
+#!/bin/bash -ex
 #
 # Install EarlyOOM
 #
 
 [[ $(uname) = Linux ]] || exit 1
+[[ $USER = root ]] || exit 1
 
 # 64 - enable signalling of processes (term, kill, oom-kill)
 # TODO: This setting will not persist across reboots
-sysrq=$(( $(cat /proc/sys/kernel/sysrq) | 64 ))
-sudo sysctl -w kernel.sysrq=$sysrq
+sysctl -w kernel.sysrq=$(( $(cat /proc/sys/kernel/sysrq) | 64 ))
 
 if command -v earlyoom; then
-  sudo systemctl status earlyoom
-  exit 0
+  systemctl status earlyoom
+else
+  wget http://ftp.us.debian.org/debian/pool/main/e/earlyoom/earlyoom_1.1-2_amd64.deb
+  apt install --quiet --yes ./earlyoom_1.1-2_amd64.deb
+
+  cat > earlyoom <<OOM
+  # use the kernel OOM killer, trigger at 20% available RAM,
+  EARLYOOM_ARGS="-k -m 20"
+OOM
+  cp earlyoom /etc/default/
+  rm earlyoom
+
+  systemctl stop earlyoom
+  systemctl enable earlyoom
+  systemctl start earlyoom
 fi
 
-wget http://ftp.us.debian.org/debian/pool/main/e/earlyoom/earlyoom_1.1-2_amd64.deb
-sudo apt install --quiet --yes ./earlyoom_1.1-2_amd64.deb
-
-cat > earlyoom <<OOM
-# use the kernel OOM killer, trigger at 20% available RAM,
-EARLYOOM_ARGS="-k -m 20"
-OOM
-sudo cp earlyoom /etc/default/
-rm earlyoom
-
-sudo systemctl stop earlyoom
-sudo systemctl enable earlyoom
-sudo systemctl start earlyoom
-
-exit 0