From: Prarit Bhargava <prarit@redhat.com>

Subject: mcelog version: Add ability for OS to define version

commit 59b8cab3f607573cb55b6841ece2f2577be6b419
Author: Prarit Bhargava <prarit@redhat.com>
Date:   Mon May 22 10:25:57 2017 -0400

    mcelog version: Add ability for OS to define version
    
    Example usage of this patch:
    
    [root@intel-purley-03 mcelog]# cat .os_version
    mcelog-144-3.94d853b2ea81.el7
    [root@intel-purley-03 mcelog]# make version.tmp
    ( printf "char version[] = \"" ;                        \
    if test -e .os_version; then                            \
            cat .os_version | tr -d '\n' ;                  \
    elif command -v git >/dev/null; then                    \
            if [ -d .git ] ; then                           \
                    git describe --tags HEAD | tr -d '\n';  \
            else                                            \
                    printf "unknown" ;                      \
            fi ;                                            \
    else                                                    \
            printf "unknown" ;                              \
    fi ;                                                    \
    printf '";\n'                                           \
    ) > version.tmp
    [root@intel-purley-03 mcelog]# cat version.tmp
    char version[] = "mcelog-144-3.94d853b2ea81.el7";
    [root@intel-purley-03 mcelog]# rm .os_version
    rm: remove regular file ‘.os_version’? y
    [root@intel-purley-03 mcelog]# make version.tmp
    ( printf "char version[] = \"" ;                        \
    if test -e .os_version; then                            \
            cat .os_version | tr -d '\n' ;                  \
    elif command -v git >/dev/null; then                    \
            if [ -d .git ] ; then                           \
                    git describe --tags HEAD | tr -d '\n';  \
            else                                            \
                    printf "unknown" ;                      \
            fi ;                                            \
    else                                                    \
            printf "unknown" ;                              \
    fi ;                                                    \
    printf '";\n'                                           \
    ) > version.tmp
    [root@intel-purley-03 mcelog]# cat version.tmp
    char version[] = "v149-7-g62e645e4c0e9";
    
    ----8<----
    
    OSes package mcelog (rpm, deb, etc.) and the package version may differ
    from the git version.
    
    Add the ability for the OS to define a version in a local .os_version
    file.  If the file exists, the version in the file is returned for
    'mcelog --version'.  If the file isn't specified the old method of using
    git and defaulting to 'unknown' are used.
    
    Signed-off-by: Prarit Bhargava <prarit@redhat.com>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/Makefile b/Makefile
index 864378eb72de315f07d424540509e844241fd932..57373afaf6c77f40d2188dc855c5bc2bd5a02657 100644
--- a/Makefile
+++ b/Makefile
@@ -81,16 +81,20 @@ depend: .depend
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(WARNINGS) $(ADD_DEFINES) -o $@ $<
 
 version.tmp: FORCE
-	( echo -n "char version[] = \"" ; 	\
-	if command -v git >/dev/null; then 	\
-	if [ -d .git ] ; then 			\
-		git describe --tags HEAD | tr -d '\n'; 	\
-	else 					\
-		echo -n "unknown" ; 		\
-	fi ;					\
-	else echo -n "unknown" ; fi ;		\
-	echo '";'				\
-	 ) > version.tmp
+	( printf "char version[] = \"" ; 			\
+	if test -e .os_version; then				\
+		cat .os_version	| tr -d '\n' ;			\
+	elif command -v git >/dev/null; then 			\
+		if [ -d .git ] ; then 				\
+			git describe --tags HEAD | tr -d '\n'; 	\
+		else 						\
+			printf "unknown" ; 			\
+		fi ;						\
+	else							\
+		printf "unknown" ;				\
+	fi ;							\
+	printf '";\n'						\
+	) > version.tmp
 
 version.c: version.tmp
 	cmp version.tmp version.c || mv version.tmp version.c