Make gofmt errors fail build and add `make fmt`

We may want to consider requiring `gofmt -s` compliance in future
builds, but for now we just use `gofmt`.

Makefile

@@ -4,12 +4,12 @@ VETARGS?=-asmdecl -atomic -bool -buildtags -copylocks -methods -nilfunc -printf
 default: test
 
 # bin generates the releaseable binaries for Terraform
-bin: generate
+bin: fmtcheck generate
 	@sh -c "'$(CURDIR)/scripts/build.sh'"
 
 # dev creates binaries for testing Terraform locally. These are put
 # into ./bin/ as well as $GOPATH/bin
-dev: generate
+dev: fmtcheck generate
 	@TF_DEV=1 sh -c "'$(CURDIR)/scripts/build.sh'"
 
 quickdev: generate
@@ -18,22 +18,22 @@ quickdev: generate
 # Shorthand for quickly building the core of Terraform. Note that some
 # changes will require a rebuild of everything, in which case the dev
 # target should be used.
-core-dev: generate
+core-dev: fmtcheck generate
 	go install github.com/hashicorp/terraform
 
 # Shorthand for building and installing just one plugin for local testing.
 # Run as (for example): make plugin-dev PLUGIN=provider-aws
-plugin-dev: generate
+plugin-dev: fmtcheck generate
 	go install github.com/hashicorp/terraform/builtin/bins/$(PLUGIN)
 	mv $(GOPATH)/bin/$(PLUGIN) $(GOPATH)/bin/terraform-$(PLUGIN)
 
 # test runs the unit tests and vets the code
-test: generate
+test: fmtcheck generate
 	TF_ACC= go test $(TEST) $(TESTARGS) -timeout=30s -parallel=4
 	@$(MAKE) vet
 
 # testacc runs acceptance tests
-testacc: generate
+testacc: fmtcheck generate
 	@if [ "$(TEST)" = "./..." ]; then \
 		echo "ERROR: Set TEST to a specific package. For example,"; \
 		echo "  make testacc TEST=./builtin/providers/aws"; \
@@ -42,7 +42,7 @@ testacc: generate
 	TF_ACC=1 go test $(TEST) -v $(TESTARGS) -timeout 90m
 
 # testrace runs the race checker
-testrace: generate
+testrace: fmtcheck generate
 	TF_ACC= go test -race $(TEST) $(TESTARGS)
 
 # updatedeps installs all the dependencies that Terraform needs to run
@@ -84,4 +84,10 @@ vet:
 generate:
 	go generate ./...
 
-.PHONY: bin default generate test updatedeps vet
+fmt:
+	gofmt -w .
+
+fmtcheck:
+	@sh -c "'$(CURDIR)/scripts/gofmtcheck.sh'"
+
+.PHONY: bin default generate test updatedeps vet fmt fmtcheck

scripts/build.sh

@@ -18,6 +18,7 @@ GIT_DIRTY=$(test -n "`git status --porcelain`" && echo "+CHANGES" || true)
 XC_ARCH=${XC_ARCH:-"386 amd64 arm"}
 XC_OS=${XC_OS:-linux darwin windows freebsd openbsd}
 
+
 # Get dependencies unless running in quick mode
 if [ "${TF_QUICKDEV}x" == "x" ]; then
     echo "==> Getting dependencies..."
@@ -30,6 +31,7 @@ rm -f bin/*
 rm -rf pkg/*
 mkdir -p bin/
 
+
 # If its dev mode, only build for ourself
 if [ "${TF_DEV}x" != "x" ]; then
     XC_OS=$(go env GOOS)

scripts/gofmtcheck.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# Check gofmt
+echo "==> Checking that code complies with gofmt requirements..."
+gofmt_files=$(gofmt -l .)
+if [[ -n ${gofmt_files} ]]; then
+    echo 'gofmt needs running on the following files:'
+    echo "${gofmt_files}"
+    echo "You can use the command: \`make fmt\` to reformat code."
+    exit 1
+fi
+
+exit 0