Put the commit ID in the version string

Finally, we are able to identify the builds more accurately. Now we check
if commit-id (cogito tool) is available and pass the output to vernum.c
compilation which then exports it as a build_id string.

The first line of --version is now a bit long, we should probably move the
build date to a second indented line or something.

Makefile.config.in

@@ -42,6 +42,7 @@ BUILD_INCLUDED_LIBINTL = @BUILD_INCLUDED_LIBINTL@
 CATALOGS = @CATALOGS@
 CATOBJEXT = @CATOBJEXT@
 CC = @CC@
+COMMIT_ID = @COMMIT_ID@
 CONFDIR = @CONFDIR@
 CONFIG_NLS = @CONFIG_NLS@
 DATADIRNAME = @DATADIRNAME@

configure.in

@@ -34,6 +34,8 @@ AC_PROG_AWK
 AC_PATH_PROGS(AWK, "$AWK")
 AC_PROG_RANLIB
 
+AC_PATH_PROGS(COMMIT_ID, "commit-id")
+
 CONFIG_ASCIIDOC="no"
 CONFIG_POD2HTML="no"
 CONFIG_XMLTO="no"

src/Makefile

@@ -83,6 +83,11 @@ ELINKSLIBS = \
  $(INTLLIBS) \
  util/libutil.a
 
+# Get the GIT HEAD ID if possible
+ifdef COMMIT_ID
+INCLUDES += -DBUILD_ID="\"$$($(COMMIT_ID) 2> /dev/null)\""
+endif
+
 OBJS = vernum.o
 vernum.o: FORCE
 FORCE:

src/main/version.c

@@ -75,6 +75,8 @@ get_dyn_full_version(struct terminal *term, int more)
 	if (!init_string(&string)) return NULL;
 
 	add_format_to_string(&string, "ELinks %s", VERSION_STRING);
+	if (*build_id)
+		add_format_to_string(&string, " (%s)", build_id);
 	if (more) {
 		add_to_string(&string, "\n");
 		add_format_to_string(&string, _("Built on %s %s", term),

src/vernum.c

@@ -11,3 +11,4 @@
 
 unsigned char *build_date = __DATE__;
 unsigned char *build_time = __TIME__;
+unsigned char *build_id = BUILD_ID;

src/vernum.h

@@ -3,6 +3,6 @@
 #ifndef EL__VERNUM_H
 #define EL__VERNUM_H
 
-extern unsigned char *build_date, *build_time;
+extern unsigned char *build_date, *build_time, *build_id;
 
 #endif /* EL__VERNUM_H */