initial

build.rs

@@ -0,0 +1,12 @@
+use std::process::Command;
+use std::str;
+
+fn main() {
+    let desc_c = Command::new("git").args(&["describe", "--all", "--long"]).output().unwrap();
+
+    let desc = unsafe {
+        str::from_utf8_unchecked( &desc_c.stdout )
+    };
+
+    println!("cargo:rustc-env=GIT_REV={}", desc);
+}