From d2adcf51505484efd164d6c867a8157061d1ff29 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 13 Jan 2014 12:22:03 +0100
Subject: [*] Add automatic version string generation

---
 CMakeLists.txt      | 20 ++++++++++++++++++++
 get-version.sh      |  6 ++++++
 src/client/client.c |  1 +
 src/server/server.c |  1 +
 src/version.c.in    |  4 ++++
 src/version.h       |  7 +++++--
 6 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100755 get-version.sh
 create mode 100644 src/version.c.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0dd9a37..e04416d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,7 +36,25 @@ FIND_PACKAGE(ZLIB REQUIRED)
 
 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${ZLIB_INCLUDE_DIR})
 
+################################################################################
+# VERSION HEADER                                                               #
+################################################################################
 
+FILE(WRITE ${CMAKE_BINARY_DIR}/version.cmake
+"EXECUTE_PROCESS(
+	COMMAND \${CMD}
+	OUTPUT_VARIABLE VERSION
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+ )
+ CONFIGURE_FILE(\${SRC} \${DST} @ONLY)
+")
+ADD_CUSTOM_TARGET(
+	version
+	${CMAKE_COMMAND} -D SRC=${CMAKE_SOURCE_DIR}/src/version.c.in
+						-D DST=${CMAKE_BINARY_DIR}/version.c
+						-D CMD=${CMAKE_SOURCE_DIR}/get-version.sh
+						-P ${CMAKE_BINARY_DIR}/version.cmake
+)
 
 ################################################################################
 # CLIENT                                                                       #
@@ -45,6 +63,7 @@ INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR} ${ZLIB_INCLUDE_DIR})
 FILE(GLOB_RECURSE CLIENT_SRCS src/client/*.c)
 ADD_EXECUTABLE(dnbd3-client ${CLIENT_SRCS})
 TARGET_LINK_LIBRARIES(dnbd3-client)
+ADD_DEPENDENCIES(dnbd3-client version)
 
 
 
@@ -58,6 +77,7 @@ TARGET_LINK_LIBRARIES(dnbd3-server ${CMAKE_THREAD_LIBS_INIT} ${ZLIB_LIBRARIES})
 if(UNIX AND NOT APPLE)
 	target_link_libraries(dnbd3-server rt)
 endif()
+ADD_DEPENDENCIES(dnbd3-server version)
 
 
 
diff --git a/get-version.sh b/get-version.sh
new file mode 100755
index 0000000..d0a095c
--- /dev/null
+++ b/get-version.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+[ -n "$(git diff)" ] && MODDED='+MOD'
+
+echo $(git describe)$MODDED, branch $(git rev-parse --abbrev-ref HEAD), built "$(date +%Y-%m-%d)"
+
diff --git a/src/client/client.c b/src/client/client.c
index c0d316b..bb5683b 100644
--- a/src/client/client.c
+++ b/src/client/client.c
@@ -638,6 +638,7 @@ static int dnbd3_daemon_send(int argc, char **argv)
 
 static void dnbd3_print_help(char *argv_0)
 {
+	printf( "Version: %s\n\n", VERSION_STRING );
 	printf( "\nUsage: %s\n"
 			"\t-h <host> -i <image name> [-r <rid>] -d <device> [-a <KB>] || -c <device>\n\n", argv_0 );
 	printf( "Start the DNBD3 client.\n" );
diff --git a/src/server/server.c b/src/server/server.c
index eef9fdc..968d59f 100644
--- a/src/server/server.c
+++ b/src/server/server.c
@@ -71,6 +71,7 @@ static void dnbd3_printClients();
  */
 void dnbd3_print_help(char *argv_0)
 {
+	printf( "Version: %s\n\n", VERSION_STRING );
 	printf( "Usage: %s [OPTIONS]...\n", argv_0 );
 	printf( "Start the DNBD3 server\n" );
 	printf( "-c or --config      Configuration file (default /etc/dnbd3-server.conf)\n" );
diff --git a/src/version.c.in b/src/version.c.in
new file mode 100644
index 0000000..54854c9
--- /dev/null
+++ b/src/version.c.in
@@ -0,0 +1,4 @@
+#include "version.h"
+
+const char *  VERSION_STRING = "@VERSION@";
+
diff --git a/src/version.h b/src/version.h
index 60246b7..0c4a66b 100644
--- a/src/version.h
+++ b/src/version.h
@@ -21,7 +21,10 @@
 #ifndef VERSION_H_
 #define VERSION_H_
 
-#define VERSION_STRING "1.0.0"
-#define VERSION_NUMBER 100
+extern const char *VERSION_STRING;
+
+// This is done in a little weird way but otherwise eclipse complains about
+// unresolvable symbols etc...
+#include "version.c"
 
 #endif /* VERSION_H_ */
-- 
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