From daf87b002dd871d7d369539d9126b7d9e99b204a Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 19 Dec 2017 08:51:13 +0100
Subject:  Initial commit

---
 check-kernel | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100755 check-kernel

diff --git a/check-kernel b/check-kernel
new file mode 100755
index 0000000..5370f49
--- /dev/null
+++ b/check-kernel
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+if which pacman >/dev/null 2>&1; then
+  # arch linux
+  running=$(
+    uname -r | \
+      sed '
+        s|-ARCH$||
+      '
+  )
+  installed=$(
+    pacman -Q linux | \
+      cut -d' ' -f2
+  )
+elif which apt >/dev/null 2>&1; then
+  # debian
+  running=$(
+    uname -r
+  )
+  installed=$(
+    dpkg-query -W 'linux-image-*-?86' | \
+      cut -f1 | \
+      sed '
+        s|^linux-image-||
+      ' | \
+      sort -V | \
+      tail -n1
+  )
+else
+  >&2 printf 'Cannot determin installed kernel.\n'
+  exit 2
+fi
+
+if [ "${running}" = "${installed}" ]; then
+  >&2 printf 'The installed kernel (%s) is currently running.\n' \
+    "${installed}"
+  exit 0
+else
+  >&2 printf 'The installed (%s) and running kernel (%s) differ.\n' \
+    "${installed}" \
+    "${running}"
+  exit 1
+fi
-- 
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