From fcae9d38f113c422a8e57a68982790aa66bc156d Mon Sep 17 00:00:00 2001
From: ub1x <ub1x@gmx.net>
Date: Mon, 1 Nov 2021 22:47:18 +0100
Subject: [PATCH] Add CheckKernel.sh and update README

---
 CheckKernel.sh | 116 +++++++++++++++++++++++++++++++++++++++++++++++++
 README.md      |   2 +-
 2 files changed, 117 insertions(+), 1 deletion(-)
 create mode 100755 CheckKernel.sh

diff --git a/CheckKernel.sh b/CheckKernel.sh
new file mode 100755
index 0000000..bab18c7
--- /dev/null
+++ b/CheckKernel.sh
@@ -0,0 +1,116 @@
+#!/bin/bash
+# CheckKernel checks if Kernel was updated and not aktivated (rebooted)
+#
+# (c) GPL by Ulf Bartholomäus ub1x@gmx.net
+VERSION="$( basename $0 ) Version 0.2.3 from 12.7.2021"
+#
+# Input:        1 parameter optional ("-d" = debug and "-v" = verbose / "-D" = Distro only / "-K" = running KernelVerion / "-N" = New Kernel Version)
+# Output:       text messages and a kdialog if this is installed
+# Returnvalue:	0 if Kernel OK and 10 if Kernel is changed
+#
+# ToDo:			Check if initrd and vmlinuz exists
+#               cat /etc/issue
+#               cat /proc/version
+# Error:        inxi - hangs in a script:
+#               MyDistro="$( eval inxi -xSz | grep Distro: | awk -F'Distro: '   '{print $2}' )"
+#               https://github.com/smxi/inxi/issues/181
+#
+# Changes:
+#	0.2.3:		Fix error => update in case only one Kernel is avaialble
+#	0.2.2:		Fix error => new Kernel update: replace initrd with vmlinuz check
+#	0.2.1:		added -D -K and -N option
+#               Fixed error and exit with more than one /boot/initrd-* file
+#	0.2.0:		InitKernel und VmlzKernel entfernt, 
+#               [ $( ls -1 /boot/ | grep initrd- | wc -l ) -gt 1 ] && echo "** Error" || ls -1 /boot/ | grep initrd- | cut -d '-' -f 2,3,4
+#               Some small changes and simplifications
+#	0.1.9:		NewKernel erneut angepasstsys
+#	0.1.8:		"==" -> "=" sowie kleinere Shönheitskorrekturen - sowie NewKernel mit awk statt cut
+#	0.1.7:		remove "CheckKernel.sh: Zeile 33: lsb_release: Kommando nicht gefunden." 
+#			and => -d = debaug
+#	0.1.6:		if "lsb_release" not available use "cat /etc/*-release" info
+#	0.1.5:		Fix trouble if NewKernel is empty
+#	0.1.4:		Fix some errors
+#	0.1.3:		Fix running and new kernel are equal but shown as different
+#	0.1.2:		Remove "initrd-" from InitKernel
+#	0.1.1:		Add Kernel Info in kdialog
+#	0.1.0:		exchange some direct calls against definition
+#				add check if new Kernel is in GRUB Config file
+#	0.0.7:		read Kernel version from menu.lst
+#	0.0.6:		add verbose mode
+#	0.0.5:		syslog messages
+#	0.0.4:		returnvalue if Kernel is changed is 10
+#	0.0.3:		hostname in kdialog title
+#	0.0.2:		kdialog output
+#	0.0.1:		generation
+#
+
+DEBUG=""
+MyDistro=""
+MyKernel=""
+NewKernel=""
+InitKernel=""
+
+if [ $# -gt 0 ] && [ "$1" = "-d" ] ; then
+    DEBUG="1"
+    echo -e "\t<${VERSION}>"
+    shift
+fi
+
+MyDistro="$( cat /proc/version )"
+MyDistro="${MyDistro/*;/}" # remove first string till ";"
+MyDistro="${MyDistro/)*/}" # remove anything behind ")"
+MyDistro="${MyDistro/# /}" # remove blanks in the beginning
+
+if [ $# -gt 0 ] && [ "$1" = "-D" ] ; then
+    echo "${MyDistro}"
+    exit
+fi
+
+MyKernel="$( uname -r )"
+
+if [ $# -gt 0 ] && [ "$1" = "-K" ] ; then
+    echo "${MyKernel}"
+    exit
+fi
+
+InitKernel="$( ls -1tr /boot/ | grep 'vmlinuz-' )"
+if [ $( echo "${InitKernel}" | wc -l ) -ge 1 ] ; then
+    # If To much Kernels - exit
+    # use only the last listed kernel (hopfully the newest)
+    NewKernel="${InitKernel/*vmlinuz-/}"
+else
+    # no "vmlinuz" entry
+    [ ${DEBUG} ] && echo "** Error: /boot/vmlinuz-* is missing <${InitKernel}>"
+#    exit 10
+    NewKernel="Missing /boot/vmlinuz-*"
+fi
+
+if [ $# -gt 0 ] && [ "$1" = "-N" ] ; then
+    echo "${NewKernel}"
+    exit
+fi
+
+if [ ${DEBUG} ] ; then
+  echo -e "* Debug Info *\n\t MyDistro=${MyDistro},\n\t MyKernel=${MyKernel},\n\t InitKernel=${InitKernel},\n\t NewKernel=${NewKernel}!"
+  [ "x${MyKernel}" = "x${NewKernel}" ] && echo -e "*\t(${MyKernel}) = (${NewKernel})" || echo -e "***\t(${MyKernel}) != ${NewKernel} !!!"
+  echo "*"
+fi
+
+if [ "x${MyKernel}" = "x${NewKernel}" ] ; then 
+  if [ $# -gt 0 ] && [ "$1" = "-v" ] ; then
+	echo -e "\t*** Distro: ${MyDistro} \tKernel ${MyKernel} \t$( date "+%X / %d.%m.%Y" ) \t*** Kernel OK ***"
+  else
+	echo "*** Kernel OK  (${MyKernel})"; 
+  fi
+else 
+  if ( [ $# -gt 0 ] && [ "$1" == "-v" ] ) ; then
+	echo -e "\t*** Distro: ${MyDistro} \tKernel ${MyKernel} \t$( date "+%X / %d.%m.%Y" ) \t*** NEW Kernel ${NewKernel}!!! ***"
+  else
+	MsgTxt="*** Kernel Updated from ${MyKernel} to ${NewKernel}! => please reboot"
+	echo "${MsgTxt}";
+	logger -t $( basename $0 ) "${MsgTxt}"
+	if [ $# -eq 0 ] && [ -e $( which kdialog 2>> /dev/null ) ] ; then
+	  kdialog --title "*** $( hostname ) ***" --error "${MsgTxt}"  >> /dev/null 2>> /dev/null
+	fi
+  fi
+fi
diff --git a/README.md b/README.md
index 9234b37..35ff6f7 100644
--- a/README.md
+++ b/README.md
@@ -17,4 +17,4 @@ See also at [LUG-VS-Wiki Nützliche Scripte](https://lug-vs.org//lugvswiki/index
 |[SchredderHDD.sh](SchredderHDD.sh)|Delete a mechanical  Hard Disk (HDD) reliably to ensure before forward it to the recycling, that no old data are there|
 |[wmf2svg.sh](wmf2svg.sh)|Example script converts WMF files in SVG to share it easily on the internet|
 |[SicherPC.sh](SicherPC.sh)|Save some helpfull settings (not /home) and some general informatins|
-
+|[CheckKernel.sh](CheckKernel.sh)|Show some intersting Kernel informations (supports -d for debug und -v for verbose)|