Add build time to version string.

Change-Id: I8860450a2839b11e313f5ddef6cd1eddffe4795f

bin/gen_build_version.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
+
+# This scrips generates be/src/common/version.cc which contains the build version based
+# on the git hash.
+
+# Current impala version.
+VERSION = "0.1"
+
+import os
+import time;
+from commands import getstatusoutput
+from time import localtime, strftime
+
+status,GIT_HASH = getstatusoutput('git rev-parse HEAD')
+if status != 0:
+  print "Couldn't get git hash.  Are you in a git repository?"
+  exit()
+
+preamble = '\
+// Copyright (c) 2011 Cloudera, Inc. All rights reserved.\n\
+// This is a generated file, DO NOT EDIT IT.\n\
+// To change this file, see impala/bin/gen_build_version.py\n\
+\n\
+#include "common/version.h"\n\
+\n\
+using namespace impala;\n\n'
+
+# construct the build time (e.g. Thu, 04 Oct 2012 11:53:17 PST)
+build_time = "%s %s" % (strftime("%a, %d %b %Y %H:%M:%S", localtime()), time.tzname[0])
+
+RESULT_PATH = os.environ['IMPALA_HOME'] + '/be/src/common/version.cc'
+version_string = "const char* Version::BUILD_VERSION = \"%s\";" % VERSION;
+hash_string = "const char* Version::BUILD_HASH = \"%s\";" % GIT_HASH;
+time_string = "const char* Version::BUILD_TIME = \"%s\";" % build_time;
+
+version_file = open(RESULT_PATH, "w")
+version_file.write(preamble)
+version_file.write(version_string + "\n");
+version_file.write(hash_string + "\n");
+version_file.write(time_string + "\n");
+version_file.close()