saving uncommitted changes in /etc prior to dnf run

kernel/install.d/dkms

@@ -0,0 +1,9 @@
+#!/usr/bin/bash
+
+if [[ "$1" == "add" ]]; then
+	/etc/kernel/postinst.d/dkms $2
+fi
+
+if [[ "$1" == "remove" ]]; then
+	/etc/kernel/prerm.d/dkms $2
+fi

kernel/postinst.d/dkms

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# We're passed the version of the kernel being installed
+inst_kern=$1
+
+uname_s=$(uname -s)
+
+_get_kernel_dir() {
+    KVER=$1
+    case ${uname_s} in
+       Linux)          DIR="/lib/modules/$KVER/build" ;;
+       GNU/kFreeBSD)   DIR="/usr/src/kfreebsd-headers-$KVER/sys" ;;
+    esac
+    echo $DIR
+}
+
+_check_kernel_dir() {
+    DIR=$(_get_kernel_dir $1)
+    case ${uname_s} in
+       Linux)          test -e $DIR/include ;;
+       GNU/kFreeBSD)   test -e $DIR/kern && test -e $DIR/conf/kmod.mk ;;
+       *)              return 1 ;;
+    esac
+    return $?
+}
+
+case "${uname_s}" in
+    Linux)
+        header_pkg="linux-headers-$inst_kern"
+        kernel="Linux"
+    ;;
+    GNU/kFreeBSD)
+        header_pkg="kfreebsd-headers-$inst_kern"
+        kernel="kFreeBSD"
+    ;;
+esac
+
+if [ -x /usr/lib/dkms/dkms_autoinstaller ]; then
+    exec /usr/lib/dkms/dkms_autoinstaller start $inst_kern
+fi
+
+if ! _check_kernel_dir $inst_kern ; then
+    echo "dkms: WARNING: $kernel headers are missing, which may explain the above failures." >&2
+    echo "      please install the $header_pkg package to fix this." >&2
+fi

kernel/prerm.d/dkms

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# We're passed the version of the kernel being removed
+inst_kern=$1
+
+# This is applied from make_initrd function in dkms command, which
+# creates the possible initrd backup file.
+remove_initrd_backup() {
+	for initrd in "initrd-$1.img" "initramfs-$1.img" "initrd.img-$1" "initrd-$1"; do
+		rm -fv /boot/"${initrd}".old-dkms >&2
+	done
+}
+
+if [ -x /usr/sbin/dkms ]; then
+while read line; do
+   name=`echo "$line" | awk '{print $1}' | sed 's/,$//'`
+   vers=`echo "$line" | awk '{print $2}' | sed 's/,$//'`
+   arch=`echo "$line" | awk '{print $4}' | sed 's/:$//'`
+   echo "dkms: removing: $name $vers ($inst_kern) ($arch)" >&2
+   dkms remove -m $name -v $vers -k $inst_kern -a $arch
+done < <(dkms status -k $inst_kern 2>/dev/null | grep ": installed")
+fi
+
+remove_initrd_backup "$inst_kern"
+
+rmdir --ignore-fail-on-non-empty \
+	"/lib/modules/$inst_kern/updates/dkms" \
+	"/lib/modules/$inst_kern/updates" 2>/dev/null
+
+exit 0