make kpatch-build a first class script

kpatch-build is outgrowing the kpatch script and probably is a better
fit as its own utility instead of being wrapped by kpatch.  Install
kpatch-build into /usr/local/bin, remove the kpatch wrapper around it,
and update the README accordingly.

Makefile.inc

@@ -4,6 +4,7 @@ CC    = gcc
 INSTALL = /usr/bin/install
 
 PREFIX    ?= /usr/local
+BINDIR     = $(DESTDIR)$(PREFIX)/bin
 SBINDIR    = $(DESTDIR)$(PREFIX)/sbin
 MODULESDIR = $(DESTDIR)$(PREFIX)/lib/modules
 LIBEXECDIR = $(DESTDIR)$(PREFIX)/libexec/kpatch

README.md

@@ -27,7 +27,7 @@ Install the dependencies for compiling kpatch:
 
 *NOTE: Ensure you have elfutils-0.158 or newer.*
 
-Install the dependencies for the "kpatch build" command:
+Install the dependencies for the "kpatch-build" command:
 
     sudo yum install rpmdevtools pesign
     sudo yum-builddep kernel
@@ -48,7 +48,7 @@ Quick start
 -----------
 
 *NOTE: While kpatch is designed to work with any recent Linux
-kernel on any distribution, the "kpatch build" command currently
+kernel on any distribution, the "kpatch-build" command currently
 only works on Fedora.*
 
 Load the kpatch core module:
@@ -62,7 +62,7 @@ Make a source patch against the kernel tree:
 
 Build the hot patch kernel module:
 
-    kpatch build /path/to/foo.patch
+    kpatch-build /path/to/foo.patch
 
 This outputs a hot patch module named `kpatch-foo.ko` in the current
 directory.  Now apply it to the running kernel:
@@ -98,9 +98,9 @@ ones.  It has four main components:
   even after a reboot into the same version of the kernel.
 
 
-### kpatch build
+### kpatch-build
 
-The "kpatch build" command converts a source-level diff patch file to a hot
+The "kpatch-build" command converts a source-level diff patch file to a hot
 patch kernel module.  Most of its work is performed by the kpatch-build script
 which uses a collection of utilities: `create-diff-object`,
 `add-patch-section`, and `link-vmlinux-syms`.
@@ -149,7 +149,7 @@ Limitations
   are safe to apply.  It's the user's responsibility to analyze any such
   patches for safety before applying them.
 - Patches which change the contents of static data structures are not currently
-  supported.  kpatch build will detect such changes and report an error.
+  supported.  kpatch-build will detect such changes and report an error.
 - Patches to functions which are always in the call stack of a task, such as
   schedule(), will fail to apply at runtime.
 - Patches which change functions that are only called in the kernel init path
@@ -256,7 +256,7 @@ http://www.youtube.com/watch?v=WeSmG-XirC4
 
 This demonstration completes each step in the previous section in a manual
 fashion.  However, from a end-user perspective, most of these steps are hidden
-by the "kpatch build" command.
+by the "kpatch-build" command.
 
 
 Get involved

kpatch-build/Makefile

@@ -13,7 +13,9 @@ all: $(TARGETS)
 
 install: all
 	$(INSTALL) -d $(LIBEXECDIR)
-	$(INSTALL) $(TARGETS) kpatch-build $(LIBEXECDIR)
+	$(INSTALL) $(TARGETS) $(LIBEXECDIR)
+	$(INSTALL) -d $(BINDIR)
+	$(INSTALL) kpatch-build $(BINDIR)
 
 clean:
 	$(RM) $(TARGETS)

kpatch-build/kpatch-build

@@ -38,12 +38,11 @@
 
 BASE="$PWD"
 LOGFILE="/tmp/kpatch-build-$(date +%s).log"
-TOOLSDIR="$(readlink -f $(dirname $0))"
+SCRIPTDIR="$(readlink -f $(dirname $0))"
 ARCHVERSION="$(uname -r)"
 DISTROVERSION="${ARCHVERSION%*.*}"
+LOCALVERSION="-${ARCHVERSION##*-}"
 CPUS="$(grep -c ^processor /proc/cpuinfo)"
-LOCALVERSION="$(uname -r)"
-LOCALVERSION="-${LOCALVERSION##*-}"
 CACHEDIR="$HOME/.kpatch"
 SRCDIR="$CACHEDIR/$ARCHVERSION/src"
 OBJDIR="$CACHEDIR/$ARCHVERSION/obj"
@@ -63,16 +62,28 @@ die() {
 
 find_data_dir() {
 	# git repo
-	DATADIR="$(readlink -f $TOOLSDIR/../kmod)"
+	DATADIR="$(readlink -f $SCRIPTDIR/../kmod)"
 	[[ -e "$DATADIR" ]] && return
 
 	# installation path
-	DATADIR="$(readlink -f $TOOLSDIR/../../share/kpatch)"
+	DATADIR="$(readlink -f $SCRIPTDIR/../share/kpatch)"
 	[[ -e "$DATADIR" ]] && return
 
 	return 1
 }
 
+find_tools_dir() {
+	#git repo
+	TOOLSDIR="$SCRIPTDIR"
+	[[ -e "$TOOLSDIR/create-diff-object" ]] && return
+
+	#installation path
+	TOOLSDIR="$(readlink -f $SCRIPTDIR/../libexec/kpatch)"
+	[[ -e "$TOOLSDIR/create-diff-object" ]] && return
+
+	return 1
+}
+
 if [[ "$#" -ne 1 ]]; then
 	echo "usage: $0 patchfile" >&2
 	exit 2
@@ -91,6 +102,9 @@ fi
 
 TEMPDIR="$(mktemp -d)" || die "mktemp failed"
 
+find_data_dir || (echo "can't find data dir" >&2 && die)
+find_tools_dir || (echo "can't find tools dir" >&2 && die)
+
 trap "rm -rf $TEMPDIR" EXIT INT TERM
 
 if [[ -d "$SRCDIR" ]]; then
@@ -125,8 +139,6 @@ echo "Building original kernel"
 make mrproper >> "$LOGFILE" 2>&1 || die
 make "-j$CPUS" vmlinux "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
 
-find_data_dir || (echo "can't find data dir" >&2 && die)
-
 cp -LR "$DATADIR/patch" "$TEMPDIR" || die
 cp "$OBJDIR/vmlinux" "$TEMPDIR" || die
 

kpatch/kpatch

@@ -20,7 +20,7 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
 # 02110-1301, USA.
 
-# This is the primary kpatch user script that manages building, applying, and
+# This is the kpatch user script that manages installing, applying, and
 # displaying information about kernel patch modules installed on the system.
 
 # TODO: add kernelrelease option to manage releases other than the
@@ -35,8 +35,6 @@ usage () {
 	echo "usage: kpatch <command> [<args>]" >&2
 	echo >&2
 	echo "Valid commands:" >&2
-	printf '   %-20s %s\n' "build <file>"         "build hotpatch module from source diff patch file" >&2
-	echo >&2
 	printf '   %-20s %s\n' "install <file>"       "install hotpatch module to the kpatch DB" >&2
 	printf '   %-20s %s\n' "uninstall <hotpatch>" "uninstall hotpatch module from the kpatch DB" >&2
 	echo >&2
@@ -94,20 +92,6 @@ echo_patch_name() {
 	echo $NAME
 }
 
-find_kpatch_build() {
-	SCRIPTDIR="$(readlink -f $(dirname $0))"
-
-	# git repo
-	KPATCHBUILD="$(readlink -f $SCRIPTDIR/../kpatch-build/kpatch-build)"
-	[[ -e "$KPATCHBUILD" ]] && return
-
-	# installation path
-	KPATCHBUILD="$(readlink -f $SCRIPTDIR/../libexec/kpatch/kpatch-build)"
-	[[ -e "$KPATCHBUILD" ]] && return
-
-	return 1
-}
-
 unset MODULE
 [[ "$#" -gt 2 ]] || [[ "$#" -lt 1 ]] && usage
 case "$1" in
@@ -196,12 +180,6 @@ case "$1" in
 	/usr/sbin/modinfo "$MODULE" || die "failed to get info for patch $PATCH"
 	;;
 
-"build")
-	find_kpatch_build || die "kpatch-build is not installed"
-	shift
-	"$KPATCHBUILD" "$@" || die "kpatch build failed"
-	;;
-
 "help"|"-h"|"--help")
 	usage
 	;;