Function GoPackagePath

internal/osutil/paths.go:373–401

GoPackagePath returns the path to the provided Go package's source directory. pkg may be a path prefix without any *.go files. The error is os.ErrNotExist if GOPATH is unset.

(pkg string)

// pkg may be a path prefix without any *.go files.
// The error is os.ErrNotExist if GOPATH is unset.
func GoPackagePath(pkg string) (path string, err error) {
	gp := os.Getenv("GOPATH")
	if gp == "" {
		cmd := exec.Command("go", "env", "GOPATH")
		out, err := cmd.Output()
		if err != nil {
			return "", fmt.Errorf("could not run 'go env GOPATH': %v, %s", err, out)
		}
		gp = strings.TrimSpace(string(out))
		if gp == "" {
			return "", os.ErrNotExist
		}
	}
	for _, p := range filepath.SplitList(gp) {
		dir := filepath.Join(p, "src", filepath.FromSlash(pkg))
		fi, err := os.Stat(dir)
		if os.IsNotExist(err) {
			continue
		}
		if err != nil {
			return "", err
		}
		if !fi.IsDir() {
			continue
		}
		return dir, nil
	}
	return path, os.ErrNotExist
}

// GoModPackagePath return the absolute path for the go.mod file without "go.mod" suffix.
func GoModPackagePath() (string, error) {