git pre-commit hook script that runs go build, go test, goimports for all packages

pre-commit-for-go-projects

#!/bin/bash

# How to use: 
# Store this file as .git/hooks/pre-commit and make it executable

# Or, to share the hook with your team, store as .githooks/pre-commit, 
# make this file executable and run:
# git config core.hooksPath .githooks

# A pre-commit hook for go projects. In addition to the standard
# checks from the sample hook, it builds the project with go build,
# runs the tests (if any), formats the source code with go fmt, and
# finally go vet to make sure only correct and good code is committed.

DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
echo "$DIR started"

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# If there are no go files, it makes no sense to run the other commands
# (and indeed, go build would fail). This is undesirable.
if [ -z "find -iname *.go" ]
then
	echo "No go files found, go tools skipped"
	exit 0
fi

go build ./...
if [ $? -ne 0 ]
then
	echo "Failed to build project. Please check the output of"
	echo "go build or run commit with --no-verify if you know"
	echo "what you are doing."
	exit 1
fi

OUTPUT="$(go test ./...)"
if [ $? -ne 0 ]
then
	echo "${OUTPUT}"
	echo "Failed to run tests. Please check the output of"
	echo "go test or run commit with --no-verify if you know"
	echo "what you are doing."
	exit 1
fi

goimports -d $(find . -type f -name '*.go' -not -path "**/*/vendor/*")

if [ $? -ne 0 ]
then
	echo ""
	echo "Failed to run go fmt. This shouldn't happen. Please"
	echo "check its output or run commit with --no-verify if "
	echo "you know what you are doing."
	exit 1
fi

go vet ./... 
if [ $? -ne 0 ]
then
	echo ""
	echo "go vet has detected potential issues in your project."
	echo "Please check its output or run commit with --no-verify"
	echo "if you know what you are doing."
	exit 1
fi