when compiling LAMMPS in a git checkout, embed and print git branch and revision info into the executable

cmake/CMakeLists.txt

@@ -11,6 +11,8 @@ get_filename_component(LAMMPS_LIB_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../lib
 get_filename_component(LAMMPS_LIB_BINARY_DIR ${CMAKE_BINARY_DIR}/lib ABSOLUTE)
 get_filename_component(LAMMPS_DOC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../doc ABSOLUTE)
 
+find_package(Git)
+
 # by default, install into $HOME/.local (not /usr/local), so that no root access (and sudo!!) is needed
 if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
   set(CMAKE_INSTALL_PREFIX "$ENV{HOME}/.local" CACHE PATH "default install path" FORCE )
@@ -85,7 +87,7 @@ string(TOUPPER "${CMAKE_BUILD_TYPE}" BTYPE)
 # this is fast, so check for it all the time
 message(STATUS "Running check for auto-generated files from make-based build system")
 file(GLOB SRC_AUTOGEN_FILES ${LAMMPS_SOURCE_DIR}/style_*.h)
-list(APPEND SRC_AUTOGEN_FILES ${LAMMPS_SOURCE_DIR}/lmpinstalledpkgs.h)
+list(APPEND SRC_AUTOGEN_FILES ${LAMMPS_SOURCE_DIR}/lmpinstalledpkgs.h ${LAMMPS_SOURCE_DIR}/lmpgitversion.h)
 foreach(_SRC ${SRC_AUTOGEN_FILES})
   get_filename_component(FILENAME "${_SRC}" NAME)
   if(EXISTS ${LAMMPS_SOURCE_DIR}/${FILENAME})
@@ -1326,6 +1328,30 @@ message(STATUS "Generating lmpinstalledpkgs.h...")
 file(WRITE "${LAMMPS_STYLE_HEADERS_DIR}/lmpinstalledpkgs.h.tmp" "${temp}" )
 execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${LAMMPS_STYLE_HEADERS_DIR}/lmpinstalledpkgs.h.tmp" "${LAMMPS_STYLE_HEADERS_DIR}/lmpinstalledpkgs.h")
 
+######################################
+# Generate lmpgitversion.h
+######################################
+set(temp "#ifndef LMP_GIT_VERSION_H\n#define LMP_GIT_VERSION_H\n")
+set(temp "${temp}const char LAMMPS_NS::LAMMPS::git_version[] =")
+if(GIT_FOUND)
+  execute_process(COMMAND ${GIT_EXECUTABLE} describe HEAD
+    OUTPUT_VARIABLE temp_git_version
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
+    OUTPUT_VARIABLE temp_git_branch
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  set(temp_git "${temp_git_branch} / ${temp_git_version}")
+else()
+  set(temp_git "")
+endif()
+
+set(temp "${temp} \"${temp_git}\";\n#endif\n\n")
+message(STATUS "Generating lmpgitversion.h...")
+file(WRITE "${LAMMPS_STYLE_HEADERS_DIR}/lmpgitversion.h.tmp" "${temp}" )
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${LAMMPS_STYLE_HEADERS_DIR}/lmpgitversion.h.tmp" "${LAMMPS_STYLE_HEADERS_DIR}/lmpgitversion.h")
+
 ###########################################
 # Actually add executable and lib to build
 ############################################

src/Makefile

@@ -19,7 +19,7 @@ OBJDIR =   Obj_$@
 OBJSHDIR = Obj_shared_$@
 
 SRC =	$(wildcard *.cpp)
-INC =	$(filter-out lmpinstalledpkgs.h,$(wildcard *.h))
+INC =	$(filter-out lmpinstalledpkgs.h lmpgitversion.h,$(wildcard *.h))
 OBJ = 	$(SRC:.cpp=.o)
 
 SRCLIB = $(filter-out main.cpp,$(SRC))
@@ -167,6 +167,23 @@ lmpinstalledpkgs.h: $(SRC) $(INC)
 	        mv ${TMPNAME}.lmpinstalled lmpinstalledpkgs.h || rm ${TMPNAME}.lmpinstalled ; \
         else mv ${TMPNAME}.lmpinstalled lmpinstalledpkgs.h ; fi
 
+gitversion:
+	@echo 'Gathering git version information'
+	@echo '#ifndef LMP_GIT_VERSION_H' >  ${TMPNAME}.lmpgitversion
+	@echo '#define LMP_GIT_VERSION_H' >> ${TMPNAME}.lmpgitversion
+	@echo 'const char LAMMPS_NS::LAMMPS::git_version[] = ' >> ${TMPNAME}.lmpgitversion
+	@if (type git && git describe HEAD ) >> /dev/null 2>> /dev/null ; then \
+	  export v1=$$(git rev-parse --abbrev-ref HEAD); export v2=$$(git describe HEAD); \
+	  echo "\"$${v1} / $${v2}\";" >> ${TMPNAME}.lmpgitversion ; \
+	else \
+	  echo '"";' >> ${TMPNAME}.lmpgitversion ; \
+	fi
+	@echo '#endif' >> ${TMPNAME}.lmpgitversion
+	@if [ -f lmpgitversion.h ]; \
+          then test "`diff --brief ${TMPNAME}.lmpgitversion lmpgitversion.h`" != "" && \
+	        mv ${TMPNAME}.lmpgitversion lmpgitversion.h || rm ${TMPNAME}.lmpgitversion ; \
+        else mv ${TMPNAME}.lmpgitversion lmpgitversion.h ; fi
+
 # Build LAMMPS in one of 4 modes
 # exe =   exe with static compile in Obj_machine (default)
 # shexe = exe with shared compile in Obj_shared_machine
@@ -180,7 +197,7 @@ lmpinstalledpkgs.h: $(SRC) $(INC)
 	  -f MAKE/MACHINES/Makefile.$@ -o -f MAKE/MINE/Makefile.$@
 	@if [ ! -d $(objdir) ]; then mkdir $(objdir); fi
 	@$(SHELL) Make.sh style
-	@$(MAKE) $(MFLAGS) lmpinstalledpkgs.h
+	@$(MAKE) $(MFLAGS) lmpinstalledpkgs.h gitversion
 	@echo 'Compiling LAMMPS for machine $@'
 	@if [ -f MAKE/MACHINES/Makefile.$@ ]; \
 	  then cp MAKE/MACHINES/Makefile.$@ $(objdir)/Makefile; fi

src/Purge.list

@@ -24,6 +24,7 @@ style_nstencil.h
 style_ntopo.h
 # other auto-generated files
 lmpinstalledpkgs.h
+lmpgitversion.h
 # renamed on 7 January 2019
 pair_lebedeva.cpp
 pair_lebedeva.h

src/info.cpp

@@ -260,9 +260,13 @@ void Info::command(int narg, char **arg)
   fprintf(out,"Printed on %s\n",ctime(&now));
 
   if (flags & CONFIG) {
+    if (strlen(lmp->git_version) > 0) {
+      fprintf(out,"\nLAMMPS version: %s / %s\nGit revision: %s\n\n",
+              universe->version, universe->num_ver,lmp->git_version);
+    } else {
       fprintf(out,"\nLAMMPS version: %s / %s\n\n",
               universe->version, universe->num_ver);
-
+    }
     const char *infobuf = get_os_info();
     fprintf(out,"OS information: %s\n\n",infobuf);
     delete[] infobuf;

src/lammps.cpp

@@ -52,6 +52,7 @@
 #include "error.h"
 
 #include "lmpinstalledpkgs.h"
+#include "lmpgitversion.h"
 
 using namespace LAMMPS_NS;
 
@@ -418,6 +419,10 @@ LAMMPS::LAMMPS(int narg, char **arg, MPI_Comm communicator) :
     if ((universe->me == 0) && !helpflag) {
       if (screen) fprintf(screen,"LAMMPS (%s)\n",universe->version);
       if (logfile) fprintf(logfile,"LAMMPS (%s)\n",universe->version);
+      if (strlen(git_version) > 0) {
+        if (screen) fprintf(screen,"Git revision (%s)\n",git_version);
+        if (logfile) fprintf(logfile,"Git revision (%s)\n",git_version);
+      }
     }
 
   // universe is one or more worlds, as setup by partition switch

src/lammps.h

@@ -64,6 +64,7 @@ class LAMMPS {
   class CiteMe *citeme;          // citation info
 
   static const char * installed_packages[];
+  static const char git_version[];
 
   LAMMPS(int, char **, MPI_Comm);
   ~LAMMPS();