diff --git a/hash-version.sh b/hash-version.sh
new file mode 100644
index 0000000..a658f4f
--- /dev/null
+++ b/hash-version.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+HASH_VERSION=$(git rev-parse --short HEAD 2>/dev/null || find * -type f -name '*.go' -print0 | sort -z | xargs -0 sha1sum | sha1sum | sed -r 's/[^\da-f]+//g')
+echo $HASH_VERSION