generate .gitrevision file if it does not exist

Makefile

@@ -393,7 +393,7 @@ dbg: $(NAME)
 
 dist: tar
 
-tar: 
+tar: $(NEWREVISION)
 	$(TAR) -C .. \
 		--exclude=$(notdir $(CURDIR))/tmp* \
 		--exclude=$(notdir $(CURDIR))/debian* \

Makefile.defs

@@ -301,29 +301,20 @@ ifneq ($(VERSIONTYPE),)
     GETVERSIONOPTS = rev-parse --short HEAD
     endif
   endif
- 
+
   ifeq ($(OLDREVISION),)
   OLDREVISION = $(shell if [ -f ".$(VERSIONTYPE)revision" ] ; then \
- 					 cat .$(VERSIONTYPE)revision ;\
- 				 fi )
+					 cat .$(VERSIONTYPE)revision ;\
+				 fi )
   endif
- 
+
   ifeq ($(THISREVISION),)
   THISREVISION = $(shell if [ -f main.c -a -f Makefile.defs ] ; then \
- 				if [ -x "$(GETVERSION)" ] ; then \
- 					$(GETVERSION) $(GETVERSIONOPTS) ;\
- 				fi ;\
- 		fi )
-  endif
-
-  ifneq ($(THISREVISION),)
-  NEWREVISION = $(shell if [ "$(THISREVISION)" != "$(OLDREVISION)" ] ; then \
-  						echo "dosetrev" ; \
-  					fi )
-  else
-  THISREVISION = unknown
+				if [ -x "$(GETVERSION)" ] ; then \
+					$(GETVERSION) $(GETVERSIONOPTS) ;\
+				fi ;\
+		fi )
   endif
-
 else
   # git is the default versioning method
   VERSIONTYPE = $(shell [ -f ".gitrevision" ] && echo "git")
@@ -332,6 +323,14 @@ else
   endif
 endif
 
+ifneq ($(THISREVISION),)
+  NEWREVISION = $(shell if [ "$(THISREVISION)" != "$(OLDREVISION)" ] ; then \
+						echo "dosetrev" ; \
+					fi )
+else
+  THISREVISION = unknown
+endif
+
 
 ifeq ($(DBXML2HTML),)
 DBXML2HTML = $(shell which xsltproc)