$ go install code.google.com/p/go.tools/cmd/vet
go install code.google.com/p/go.tools/cmd/vet: open /usr/local/go/pkg/tool/linux_amd64/vet: permission denied

$ sudo su - root
# GOPATH=/tmp/go /usr/local/go/bin/go get code.google.com/p/go.tools/cmd/cover
# GOPATH=/tmp/go /usr/local/go/bin/go get code.google.com/p/go.tools/cmd/vet
# rm -r /tmp/go
# exit

$ go vet ./...