MT#17699 augment module makefile version detection

Depending on the build environment, $M might refer to a subdirectory of
the main source tree (i.e. debian directory is in $M/../debian) or the
main directory of the source tree (debian is at $M/debian). Use a shell
test to detect the correct file.

Also take git revision into account as additional info, same as the
daemon build system does.

Change-Id: Ib82ff2f9b1a1b0c94697fd91d5b9e9c9bb8e61f2

kernel-module/Makefile

@@ -2,16 +2,27 @@ PWD    := $(shell pwd)
 KSRC   ?= /lib/modules/$(shell uname -r)/build
 KBUILD := $(KSRC)
 
-ifneq ($(RTPENGINE_VERSION),)
-  EXTRA_CFLAGS += -DRTPENGINE_VERSION="\"$(RTPENGINE_VERSION)\""
-else
+ifeq ($(RTPENGINE_VERSION),)
   DPKG_PRSCHNGLG= $(shell which dpkg-parsechangelog 2>/dev/null)
+  DEB_CHANGELOG=$(shell test -f $(M)/../debian/changelog && echo $(M)/../debian/changelog || echo $(M)/debian/changelog)
   ifneq ($(DPKG_PRSCHNGLG),)
-    EXTRA_CFLAGS += -DRTPENGINE_VERSION="\"$(shell dpkg-parsechangelog -l$(M)/debian/changelog | awk '/^Version: / {print $$2}')\""
-  else
-    EXTRA_CFLAGS += -DRTPENGINE_VERSION="\"undefined\""
+    DPKG_PRSCHNGLG=$(shell dpkg-parsechangelog -l$(DEB_CHANGELOG) | awk '/^Version: / {print $$2}')
+  endif
+  GIT_BR_COMMIT=$(shell git branch --no-color --no-column -v 2> /dev/null | awk '/^\*/ {OFS="-"; print "git", $$2, $$3}')
+
+  ifneq ($(DPKG_PRSCHNGLG),)
+    RTPENGINE_VERSION+=$(DPKG_PRSCHNGLG)
+  endif
+  ifneq ($(GIT_BR_COMMIT),)
+    RTPENGINE_VERSION+=$(GIT_BR_COMMIT)
+  endif
+
+  ifeq ($(RTPENGINE_VERSION),)
+    RTPENGINE_VERSION+=undefined
   endif
 endif
+EXTRA_CFLAGS+=	-DRTPENGINE_VERSION="\"$(RTPENGINE_VERSION)\""
+
 EXTRA_CFLAGS += -D__RE_EXTERNAL
 
 obj-m        += xt_RTPENGINE.o