Log the exact version at init (#22)

Makefile

@@ -39,6 +39,12 @@ LDFLAGS  ?= -Wl,--as-needed
 override CFLAGS   += -std=gnu11 -Wall -Wextra -Werror
 override CXXFLAGS += -std=gnu++11 -Wall -Wextra -Werror
 override LDFLAGS  += -Wl,--no-undefined -Wl,-rpath,/usr/local/Kobo -Wl,-rpath,/usr/local/Qt-5.2.1-arm/lib
+
+NM_VERSION := $(shell git describe --tags --always --dirty)
+# Only use it if we got something useful out of git describe...
+ifdef NM_VERSION
+	override CPPFLAGS += -DNM_VERSION='"$(NM_VERSION)"'
+endif
 endif
 
 define GITIGNORE_HEAD

src/init.c

@@ -21,6 +21,7 @@ __attribute__((constructor)) void nm_init() {
 
     char *err;
 
+    NM_LOG("version: " NM_VERSION);
     NM_LOG("init: creating failsafe");
     nm_failsafe_t *fs;
     if (!(fs = nm_failsafe_create(&err)) && err) {

src/util.h

@@ -13,6 +13,11 @@ extern "C" {
 #include <string.h>
 #include <syslog.h>
 
+// Fallback version tag
+#ifndef NM_VERSION
+#define NM_VERSION "dev"
+#endif
+
 // strtrim trims ASCII whitespace in-place (i.e. don't give it a string literal)
 // from the left/right of the string.
 inline char *strtrim(char *s){