Go Precommit Hook (from https://github.com/PuerkitoBio/throttled/blob/master/misc/pre-commit, originally from http://golang.org/misc/git/pre-commit)

go_precommit.sh

#!/bin/sh
# Copyright 2012 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# git gofmt pre-commit hook
#
# To use, store as .git/hooks/pre-commit inside your repository and make sure
# it has execute permissions.
#
# This script does not handle file names that contain spaces.

# golint is purely informational, it doesn't fail with exit code != 0 if it finds something,
# because it may find a lot of false positives. Just print out its result for information.
echo "lint result (informational only):"
echo
golint .

# go vet returns 1 if an error was found. Exit the hook with this exit code.
go vet ./...
vetres=$?

# Check for gofmt problems and report if any.
gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
[ -z "$gofiles" ] && echo "EXIT $vetres" && exit $vetres

unformatted=$(gofmt -l $gofiles)
[ -z "$unformatted" ] && echo "EXIT $vetres" && exit $vetres

# Some files are not gofmt'd. Print message and fail.

echo >&2 "Go files must be formatted with gofmt. Please run:"
for fn in $unformatted; do
    echo >&2 "  gofmt -w $PWD/$fn"
done

echo "EXIT 1"
exit 1