tailscale/tstest/integration/gen_deps.go

// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build ignore

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"os/exec"
)

func main() {
	var x struct {
		Imports []string
	}
	j, err := exec.Command("go", "list", "-json", "tailscale.com/cmd/tailscaled").Output()
	if err != nil {
		log.Fatal(err)
	}
	if err := json.Unmarshal(j, &x); err != nil {
		log.Fatal(err)
	}
	var out bytes.Buffer
	out.WriteString(`// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Code generated by gen_deps.go; DO NOT EDIT.

package integration

import (
	// And depend on a bunch of tailscaled innards, for Go's test caching.
	// Otherwise cmd/go never sees that we depend on these packages'
	// transitive deps when we run "go install tailscaled" in a child
	// process and can cache a prior success when a dependency changes.
`)
	for _, dep := range x.Imports {
		fmt.Fprintf(&out, "\t_ %q\n", dep)
	}
	fmt.Fprintf(&out, ")\n")

	err = ioutil.WriteFile("tailscaled_deps_test.go", out.Bytes(), 0644)
	if err != nil {
		log.Fatal(err)
	}
}