bees: add version string and put it in main() and stats file

Now that we have more than one bees release it's somewhat important
to know which one each bug report is for...

src/.gitignore

@@ -0,0 +1 @@
+bees-version.h

src/Makefile

@@ -11,6 +11,8 @@ LIBS = -lcrucible -lpthread
 LDFLAGS = -L../lib -Wl,-rpath=$(shell realpath ../lib)
 
 depends.mk: Makefile *.cc
+	echo "#define BEES_VERSION \"$(shell git describe --always --dirty || echo UNKNOWN)\"" > bees-version.new.h
+	mv -f bees-version.new.h bees-version.h
 	for x in *.cc; do $(CXX) $(CXXFLAGS) -M "$$x"; done > depends.mk.new
 	mv -fv depends.mk.new depends.mk
 
@@ -36,4 +38,4 @@ BEES_OBJS = \
 	$(CXX) $(CXXFLAGS) -o "$@" $(BEES_OBJS) $(LDFLAGS) $(LIBS)
 
 clean:
-	-rm -fv *.o
+	-rm -fv *.o bees-version.h

src/bees-hash.cc

@@ -1,3 +1,4 @@
+#include "bees-version.h"
 #include "bees.h"
 
 #include "crucible/crc64.h"
@@ -259,6 +260,7 @@ BeesHashTable::prefetch_loop()
 
 		graph_blob << "Now:     " << format_time(time(NULL)) << "\n";
 		graph_blob << "Uptime:  " << m_ctx->total_timer().age() << " seconds\n";
+		graph_blob << "Version: " << BEES_VERSION << "\n";
 
 		graph_blob 
 			<< "\nHash table page occupancy histogram (" << occupied_count << "/" << total_count << " cells occupied, " << (occupied_count * 100 / total_count) << "%)\n" 

src/bees.cc

@@ -1,3 +1,4 @@
+#include "bees-version.h"
 #include "bees.h"
 
 #include "crucible/interp.h"
@@ -557,7 +558,7 @@ bees_main(ArgList args)
 	list<shared_ptr<BeesContext>> all_contexts;
 	shared_ptr<BeesContext> bc;
 
-	// Subscribe to fanotify events
+	// Create a context and start crawlers
 	bool did_subscription = false;
 	for (string arg : args) {
 		catch_all([&]() {
@@ -585,6 +586,8 @@ bees_main(ArgList args)
 int
 main(int argc, const char **argv)
 {
+	cerr << "bees version " << BEES_VERSION << endl;
+
 	if (argc < 2) {
 		do_cmd_help(argv);
 		return 2;