fixes: https://github.com/iovisor/bpftrace/issues/322

.gitignore

 build/
 build-*/
 tests/runtime/*.pyc
+/src/version.h

src/CMakeLists.txt

@@ -30,3 +30,17 @@ if (KERNEL_HEADERS_DIR)
 MESSAGE(STATUS "Using KERNEL_HEADERS_DIR=${KERNEL_HEADERS_DIR}")
 target_compile_definitions(bpftrace PUBLIC KERNEL_HEADERS_DIR="${KERNEL_HEADERS_DIR}")
 endif()
+
+execute_process(
+  COMMAND git describe --abbrev=4 --dirty --always --tags
+  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+  OUTPUT_VARIABLE GIT_VERSION
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+add_definitions("-DVERSION=${GIT_VERSION}")
+
+configure_file(
+  ${CMAKE_SOURCE_DIR}/src/version.h.in
+  ${CMAKE_SOURCE_DIR}/src/version.h
+)

src/main.cpp

@@ -12,6 +12,7 @@
 #include "printer.h"
 #include "semantic_analyser.h"
 #include "tracepoint_format_parser.h"
+#include "version.h"
 
 using namespace bpftrace;
 
@@ -75,6 +76,12 @@ int main(int argc, char *argv[])
   char *cmd_str = nullptr;
   bool listing = false;
 
+  if (argc > 1 && strcmp(argv[1], "--version") == 0)
+  {
+    std::cout << "bpfTrace " << GIT_VERSION << "\n" << std::endl;
+    return 0;
+  }
+
   std::string script, search;
   int c;
   while ((c = getopt(argc, argv, "de:hlp:vc:")) != -1)

src/version.h.in

+#ifndef VERSION_H
+#define VERSION_H
+
+#define GIT_VERSION "@GIT_VERSION@"
+
+#endif