MDEV-12583 : Bake the git hash into the binaries.

Added version_source_revision server "variable", for the git revision.
Also , mysql -V will show git revision.

"make dist" will now pack source_revision.h into the source package.

CMakeLists.txt

@@ -432,6 +432,23 @@ CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/include/mysql_version.h.in
                ${CMAKE_BINARY_DIR}/include/mysql_version.h )
 CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/sql/sql_builtin.cc.in
     ${CMAKE_BINARY_DIR}/sql/sql_builtin.cc)
+
+FIND_PACKAGE(Git)
+IF(GIT_EXECUTABLE)
+  EXECUTE_PROCESS(
+    COMMAND ${GIT_EXECUTABLE} rev-parse HEAD
+      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+       OUTPUT_VARIABLE OUT RESULT_VARIABLE RES)
+  IF(RES EQUAL 0)
+    STRING(REGEX REPLACE "\n$" "" SOURCE_REVISION "${OUT}")
+  ENDIF()
+ENDIF()
+IF(SOURCE_REVISION OR
+  (NOT EXISTS ${PROJECT_SOURCE_DIR}/include/source_revision.h))
+  CONFIGURE_FILE(${PROJECT_SOURCE_DIR}/include/source_revision.h.in
+               ${PROJECT_BINARY_DIR}/include/source_revision.h )
+ENDIF()
+
 CONFIGURE_FILE(
     ${CMAKE_SOURCE_DIR}/cmake/info_macros.cmake.in
     ${CMAKE_BINARY_DIR}/info_macros.cmake @ONLY)

client/mysql.cc

@@ -40,7 +40,7 @@
 #include "my_readline.h"
 #include <signal.h>
 #include <violite.h>
-
+#include <source_revision.h>
 #if defined(USE_LIBEDIT_INTERFACE) && defined(HAVE_LOCALE_H)
 #include <locale.h>
 #endif
@@ -1721,8 +1721,8 @@ static void usage(int version)
 	 my_progname, VER, MYSQL_SERVER_VERSION, SYSTEM_TYPE, MACHINE_TYPE,
          readline, rl_library_version);
 #else
-  printf("%s  Ver %s Distrib %s, for %s (%s)\n", my_progname, VER,
-	MYSQL_SERVER_VERSION, SYSTEM_TYPE, MACHINE_TYPE);
+  printf("%s  Ver %s Distrib %s, for %s (%s), source revision %s\n", my_progname, VER,
+	MYSQL_SERVER_VERSION, SYSTEM_TYPE, MACHINE_TYPE,SOURCE_REVISION);
 #endif
 
   if (version)

cmake/make_dist.cmake.in

@@ -52,6 +52,9 @@ IF(GIT_EXECUTABLE)
   ENDIF()
 ENDIF()
 
+CONFIGURE_FILE(${CMAKE_BINARY_DIR}/include/source_revision.h
+       ${PACKAGE_DIR}/include/source_revision.h COPYONLY)
+
 IF(NOT GIT_EXECUTABLE)
   MESSAGE(STATUS "git not found or source dir is not a repo, use CPack")
   

include/source_revision.h.in

+#cmakedefine SOURCE_REVISION "@SOURCE_REVISION@"

sql/sys_vars.cc

@@ -3503,6 +3503,14 @@ static Sys_var_charptr Sys_version_compile_os(
        CMD_LINE_HELP_ONLY,
        IN_SYSTEM_CHARSET, DEFAULT(SYSTEM_TYPE));
 
+#include <source_revision.h>
+static char *server_version_source_revision;
+static Sys_var_charptr Sys_version_source_revision(
+       "version_source_revision", "Revision of the MariaDB source code",
+       READ_ONLY GLOBAL_VAR(server_version_source_revision),
+       CMD_LINE_HELP_ONLY,
+       IN_SYSTEM_CHARSET, DEFAULT(SOURCE_REVISION));
+
 static char *guess_malloc_library()
 {
   if (strcmp(MALLOC_LIBRARY, "system") == 0)