kpatch: install to initrd and load patch modules on boot

When doing "kpatch install", copy the patch modules to the initrd and
install a dracut hook which calls "kpatch apply --all".

Makefile

@@ -1,6 +1,6 @@
 include Makefile.inc
 
-SUBDIRS     = kpatch-build kpatch kmod man
+SUBDIRS     = kpatch-build kpatch kmod man contrib
 BUILD_DIRS   = $(SUBDIRS:%=build-%)
 INSTALL_DIRS = $(SUBDIRS:%=install-%)
 UNINSTALL_DIRS = $(SUBDIRS:%=uninstall-%)

contrib/Makefile

@@ -0,0 +1,14 @@
+include ../Makefile.inc
+
+DRACUTDIR=/usr/lib/dracut/modules.d/99kpatch
+
+all:
+
+install: all
+	$(INSTALL) -d $(DRACUTDIR)
+	$(INSTALL) module-setup.sh kpatch-apply-all.sh $(DRACUTDIR)
+
+uninstall:
+	$(RM) $(DRACUTDIR)
+
+clean:

contrib/kpatch-apply-all.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+#
+# Licensed under the GPLv2
+#
+# Copyright 2014 Red Hat, Inc.
+# Josh Poimboeuf <jpoimboe@redhat.com>
+
+insmod /usr/lib/modules/$(uname -r)/kpatch/kpatch.ko
+kpatch apply --all

contrib/module-setup.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+#
+# Licensed under the GPLv2
+#
+# Copyright 2014 Red Hat, Inc.
+# Josh Poimboeuf <jpoimboe@redhat.com>
+
+# called by dracut
+check() {
+    if [[ -e /var/lib/kpatch/$kernel ]] || [[ -e /usr/lib/kpatch/$kernel ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# called by dracut
+install() {
+    # install kpatch script
+    inst_any -d /usr/sbin/kpatch /usr/local/sbin/kpatch /usr/sbin/kpatch
+
+    # install insmod (needed by kpatch script)
+    inst_symlink /usr/sbin/insmod
+
+    # install core module
+    inst_any -d /usr/lib/modules/$kernel/kpatch/kpatch.ko /usr/local/lib/modules/$kernel/kpatch/kpatch.ko /usr/lib/modules/$kernel/kpatch/kpatch.ko
+
+    # install patch modules
+    if [[ -e /var/lib/kpatch/$kernel ]]; then
+        inst_dir /var/lib/kpatch/$kernel
+        for i in /var/lib/kpatch/$kernel/*; do
+            [[ -e $i ]] || continue
+            inst "$i"
+        done
+    fi
+    if [[ -e /usr/lib/kpatch/$kernel ]]; then
+        inst_dir /usr/lib/kpatch/$kernel
+        for i in /usr/lib/kpatch/$kernel/*; do
+            [[ -e $i ]] || continue
+            inst "$i"
+        done
+    fi
+
+    # install hook script
+    inst_hook pre-udev 00 "$moddir/kpatch-apply-all.sh"
+}

kpatch/kpatch

@@ -120,6 +120,7 @@ case "$1" in
 	[[ ${PATCH: -3} == ".ko" ]] || die "$PATCH isn't a .ko file"
 	mkdir -p "$USERDIR" || die "failed to create install directory"
 	cp -f "$PATCH" "$USERDIR" || die "failed to install patch $PATCH"
+	dracut -f || die "dracut failed"
 	;;
 
 "uninstall")
@@ -127,6 +128,7 @@ case "$1" in
 	PATCH="$2"
 	find_module "$PATCH" || die "$PATCH is not installed"
 	rm -f "$USERDIR/$(basename $MODULE)" || die "failed to uninstall patch $PATCH"
+	dracut -f || die "dracut failed"
 	;;
 
 "list")