add a pre-commit hook

.hooks/pre-commit

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+count=`git ls-files | grep '.go$' | xargs gofmt -l | wc -l`
+if [ $count -gt 0 ]; then
+    echo "Some files aren't formatted, please run 'make format' to format your source code before committing"
+    exit 1
+fi
+exit 0

Makefile.in

@@ -376,8 +376,9 @@ packages:
 package: | packages build package_version_string $(files)
 	mv -f scripts/post_install.sh.bak scripts/post_install.sh
 
-check_format:
-	git ls-files | grep '.go$$' | xargs gofmt -l
+
+check:
+	./.hooks/pre-commit
 
 format:
 	git ls-files | grep '.go$$' | xargs gofmt -w -s