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// Copyright 2011 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.
// Package vet implements the ``go vet'' command.
package vet
import (
// Break init loop.
func init() {
CmdVet.Run = runVet
var CmdVet = &base.Command{
CustomFlags: true,
UsageLine: "go vet [-n] [-x] [-vettool prog] [build flags] [vet flags] [packages]",
Short: "report likely mistakes in packages",
Long: `
Vet runs the Go vet command on the packages named by the import paths.
For more about vet and its flags, see 'go doc cmd/vet'.
For more about specifying packages, see 'go help packages'.
For a list of checkers and their flags, see 'go tool vet help'.
For details of a specific checker such as 'printf', see 'go tool vet help printf'.
The -n flag prints commands that would be executed.
The -x flag prints commands as they are executed.
The -vettool=prog flag selects a different analysis tool with alternative
or additional checks.
For example, the 'shadow' analyzer can be built and run using these commands:
go install
go vet -vettool=$(which shadow)
The build flags supported by go vet are those that control package resolution
and execution, such as -n, -x, -v, -tags, and -toolexec.
For more about these flags, see 'go help build'.
See also: go fmt, go fix.
func runVet(cmd *base.Command, args []string) {
modload.LoadTests = true
vetFlags, pkgArgs := vetFlags(args)
work.VetFlags = vetFlags
if len(vetFlags) > 0 {
work.VetExplicit = true
if vetTool != "" {
var err error
work.VetTool, err = filepath.Abs(vetTool)
if err != nil {
base.Fatalf("%v", err)
pkgs := load.PackagesForBuild(pkgArgs)
if len(pkgs) == 0 {
base.Fatalf("no packages to vet")
var b work.Builder
root := &work.Action{Mode: "go vet"}
for _, p := range pkgs {
_, ptest, pxtest, err := load.TestPackagesFor(p, nil)
if err != nil {
base.Errorf("%v", err)
if len(ptest.GoFiles) == 0 && len(ptest.CgoFiles) == 0 && pxtest == nil {
base.Errorf("go vet %s: no Go files in %s", p.ImportPath, p.Dir)
if len(ptest.GoFiles) > 0 || len(ptest.CgoFiles) > 0 {
root.Deps = append(root.Deps, b.VetAction(work.ModeBuild, work.ModeBuild, ptest))
if pxtest != nil {
root.Deps = append(root.Deps, b.VetAction(work.ModeBuild, work.ModeBuild, pxtest))