--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/removeKernel	Mon Dec 23 11:41:35 2019 +0100
@@ -0,0 +1,82 @@
+#!/bin/bash
+
+if [ `whoami` != "root" ]; then
+    echo "$0 must be run as root!"
+    exit 1
+fi
+
+if [ $# -lt 3 ]; then
+    echo "usage: $0 <major minor micro [revision], e.g. 2 6 21 r4>"
+    exit 1
+fi
+
+MAJOR=$1
+MINOR=$2
+MICRO=$3
+if [ $# -gt 3 ]; then
+    REVISION=$4
+fi
+LOGFILE=/tmp/removeKernel-$$.log
+
+# unmerge the kernel
+cd /usr/src
+KERNEL_DIR="linux-${MAJOR}.${MINOR}.${MICRO}-gentoo"
+if [ "$REVISION" != "" ]; then
+    KERNEL_DIR="${KERNEL_DIR}-${REVISION}"
+fi
+if [ -d $KERNEL_DIR ]; then
+    KERNEL_NAME=gentoo-sources-${MAJOR}.${MINOR}.${MICRO}
+    if [ "${REVISION}" != "" ]; then
+        KERNEL_NAME="${KERNEL_NAME}-${REVISION}"
+    fi
+
+    echo "unmerge kernel $KERNEL_NAME" >> $LOGFILE 2>&1
+    emerge --unmerge $KERNEL_NAME >> $LOGFILE 2>&1
+
+    echo "remove $KERNEL_DIR" >> $LOGFILE 2>&1
+    rm -r  $KERNEL_DIR >> $LOGFILE 2>&1
+fi
+
+# remove modules
+cd /lib/modules
+LIB_DIR=${MAJOR}.${MINOR}.${MICRO}-gentoo
+if [ "$REVISION" != "" ]; then
+    LIB_DIR="${LIB_DIR}-${REVISION}"
+fi
+if [ -d $LIB_DIR ]; then
+    echo "remove modules from `pwd`/$LIB_DIR" >> $LOGFILE 2>&1
+    rm -r $LIB_DIR >> $LOGFILE 2>&1
+fi
+
+# remove the kernel and stuff, check if /boot is mounted first
+MOUNTED=`mount | grep /boot`
+if [ "$MOUNTED" = "" ]; then
+    echo "mount /boot" >> $LOGFILE 2>&1
+    mount /boot >> $LOGFILE 2>&1
+fi
+
+cd /boot
+
+ARCH=`uname -m`
+if [ "$ARCH" = "i686" ]; then
+    ARCH="x86"
+fi
+
+SUFFIX=genkernel-${ARCH}-${MAJOR}.${MINOR}.${MICRO}-gentoo
+if [ "$REVISION" != "" ]; then
+    SUFFIX="$SUFFIX-${REVISION}"
+fi
+rm System.map-${SUFFIX} >> $LOGFILE 2>&1
+rm initramfs-${SUFFIX} >> $LOGFILE 2>&1
+
+KERNEL="kernel-${SUFFIX}"
+if [[ -f $KERNEL ]]; then
+	rm $KERNEL >> $LOGFILE 2>&1
+fi
+KERNEL="vmlinuz-${MAJOR}.${MINOR}.${MICRO}-gentoo-${ARCH}"
+if [[ -f $KERNEL ]]; then
+	rm $KERNEL >> $LOGFILE 2>&1
+fi
+
+# if we got until here, just remove the logfile again
+rm $LOGFILE