From fb789e7d52cc67d3f5a3e713a355e121e772ebcb Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sat, 10 Oct 2020 20:08:55 +0200
Subject: initial commit

---
 reboot-if-no-net-connection         | 23 +++++++++++++++++++++++
 reboot-if-no-net-connection.service |  7 +++++++
 reboot-if-no-net-connection.timer   | 10 ++++++++++
 3 files changed, 40 insertions(+)
 create mode 100755 reboot-if-no-net-connection
 create mode 100644 reboot-if-no-net-connection.service
 create mode 100644 reboot-if-no-net-connection.timer

diff --git a/reboot-if-no-net-connection b/reboot-if-no-net-connection
new file mode 100755
index 0000000..bb8c43d
--- /dev/null
+++ b/reboot-if-no-net-connection
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+for i in {1..300}; do
+
+  default_gateway=$(
+    ip route \
+    | sed '
+      s/^default\s\+\S\+\s\+\(\S\+\)\s.*$/\1/
+      t
+      d
+    '
+  )
+
+  if [ -n "${default_gateway}" ] \
+  && ping -c1 "${default_gateway}" >/dev/null 2>&1; then
+    exit
+  fi
+
+  sleep 1
+
+done
+
+reboot
diff --git a/reboot-if-no-net-connection.service b/reboot-if-no-net-connection.service
new file mode 100644
index 0000000..cbc0f06
--- /dev/null
+++ b/reboot-if-no-net-connection.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=check net connectivity - reboot in case of error
+After=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/reboot-if-no-net-connection
diff --git a/reboot-if-no-net-connection.timer b/reboot-if-no-net-connection.timer
new file mode 100644
index 0000000..5c39d47
--- /dev/null
+++ b/reboot-if-no-net-connection.timer
@@ -0,0 +1,10 @@
+[Unit]
+Description=repeatedly check net connectivity
+
+[Timer]
+RandomizedDelaySec=1min
+OnUnitInactiveSec=10min
+OnBootSec=10min
+
+[Install]
+WantedBy=timers.target
-- 
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