Add git hash variable and print version info in trace file for improv…

…ed debugging

src/CMakeLists.txt

@@ -22,6 +22,20 @@ function(PREPEND var prefix)
   set(${var} "${listVar}" PARENT_SCOPE)
 endfunction()
 
+# default to unknown
+set(CYCLONEDDS_GIT_HASH "unknown")
+
+# find latest hash and set it
+find_package(Git QUIET)
+if(GIT_FOUND)
+    execute_process(
+        COMMAND git log -1 --pretty=format:%h
+        OUTPUT_VARIABLE CYCLONEDDS_GIT_HASH
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+endif()
+
 option(ENABLE_SECURITY "Enable OMG DDS Security support" ON)
 option(ENABLE_LIFESPAN "Enable Lifespan QoS support" ON)
 option(ENABLE_DEADLINE_MISSED "Enable Deadline Missed QoS support" ON)

src/core/ddsi/src/ddsi_init.c

@@ -18,6 +18,7 @@
 #include "dds/ddsrt/string.h"
 #include "dds/ddsrt/sync.h"
 #include "dds/ddsrt/avl.h"
+#include "dds/version.h"
 
 #include "dds/ddsi/ddsi_init.h"
 #include "dds/ddsi/ddsi_log.h"
@@ -1148,6 +1149,7 @@ int ddsi_init (struct ddsi_domaingv *gv, struct ddsi_psmx_instance_locators *psm
     char str[DDSRT_RFC3339STRLEN+1];
     ddsrt_ctime(gv->tstart.v, str, sizeof(str));
     GVLOG (DDS_LC_CONFIG, "started at %d.06%d -- %s\n", sec, usec, str);
+    GVLOG (DDS_LC_CONFIG, "Version: %s %s %s \n", DDS_PROJECT_NAME, DDS_VERSION, DDS_GIT_HASH);
   }
 
   /* Allow configuration to set "deaf_mute" in case we want to start out that way */

src/ddsrt/include/dds/version.h.in

@@ -17,6 +17,7 @@
 #define DDS_VERSION_PATCH @CycloneDDS_VERSION_PATCH@
 #define DDS_VERSION_TWEAK @CycloneDDS_VERSION_TWEAK@
 #define DDS_PROJECT_NAME "@PROJECT_NAME@"
+#define DDS_GIT_HASH  "@CYCLONEDDS_GIT_HASH@"
 
 #define DDS_HOST_NAME "@CMAKE_HOST_SYSTEM_NAME@"
 #define DDS_TARGET_NAME "@CMAKE_SYSTEM_NAME@"