ebiten/cmd/ebitenmobile/gomobile.go

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// Copyright 2019 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
)
const gomobileHash = "5d9a33257ab559d10fa8c96087aed99bf8b6d868"
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func runCommand(command string, args []string, env []string) error {
if buildX || buildN {
for _, e := range env {
fmt.Printf("%s ", e)
}
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fmt.Print(command)
for _, arg := range args {
fmt.Printf(" %s", arg)
}
fmt.Println()
}
if buildN {
return nil
}
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cmd := exec.Command(command, args...)
if len(env) > 0 {
cmd.Env = append(os.Environ(), env...)
}
if out, err := cmd.CombinedOutput(); err != nil {
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return fmt.Errorf("%s %v failed: %v\n%v", command, args, string(out), err)
}
return nil
}
func removeAll(path string) error {
if buildX || buildN {
fmt.Printf("rm -rf %s\n", path)
}
if buildN {
return nil
}
return os.RemoveAll(path)
}
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func runGo(args ...string) error {
env := []string{
"GO111MODULE=on",
}
return runCommand("go", args, env)
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}
// exe adds the .exe extension to the given filename.
// Without .exe, the executable won't be found by exec.LookPath on Windows (#1096).
func exe(filename string) string {
if runtime.GOOS == "windows" {
return filename + ".exe"
}
return filename
}
func prepareGomobileCommands() (string, error) {
tmp, err := ioutil.TempDir("", "ebitenmobile-")
if err != nil {
return "", err
}
newpath := filepath.Join(tmp, "bin")
if path := os.Getenv("PATH"); path != "" {
newpath += string(filepath.ListSeparator) + path
}
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if buildX || buildN {
fmt.Printf("PATH=%s\n", newpath)
}
if !buildN {
if err := os.Setenv("PATH", newpath); err != nil {
return tmp, err
}
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}
pwd, err := os.Getwd()
if err != nil {
return tmp, err
}
// cd
if buildX {
fmt.Printf("cd %s\n", tmp)
}
if err := os.Chdir(tmp); err != nil {
return tmp, err
}
defer func() {
os.Chdir(pwd)
}()
const (
modname = "ebitenmobiletemporary"
buildtags = "//go:build tools" +
"\n// +build tools"
)
if err := runGo("mod", "init", modname); err != nil {
return tmp, err
}
if err := ioutil.WriteFile("tools.go", []byte(fmt.Sprintf(`%s
package %s
import (
_ "golang.org/x/mobile/cmd/gobind"
_ "golang.org/x/mobile/cmd/gomobile"
)
`, buildtags, modname)), 0644); err != nil {
return tmp, err
}
// To record gomobile to go.sum for Go 1.16 and later, go-get gomobile instaed of golang.org/x/mobile (#1487).
// This also records gobind as gomobile depends on gobind indirectly.
// Using `...` doesn't work on Windows since mobile/internal/mobileinit cannot be compiled on Windows w/o Cgo (#1493).
if err := runGo("get", "golang.org/x/mobile/cmd/gomobile@"+gomobileHash); err != nil {
return tmp, err
}
if localgm := os.Getenv("EBITENMOBILE_GOMOBILE"); localgm != "" {
if !filepath.IsAbs(localgm) {
localgm = filepath.Join(pwd, localgm)
}
if err := runGo("mod", "edit", "-replace=golang.org/x/mobile="+localgm); err != nil {
return tmp, err
}
}
if err := runGo("mod", "tidy"); err != nil {
return tmp, err
}
if err := runGo("build", "-o", exe(filepath.Join("bin", "gomobile")), "golang.org/x/mobile/cmd/gomobile"); err != nil {
return tmp, err
}
if err := runGo("build", "-o", exe(filepath.Join("bin", "gobind-original")), "golang.org/x/mobile/cmd/gobind"); err != nil {
return tmp, err
}
if err := os.Mkdir("src", 0755); err != nil {
return tmp, err
}
if err := ioutil.WriteFile(filepath.Join("src", "gobind.go"), gobindsrc, 0644); err != nil {
return tmp, err
}
if err := runGo("build", "-o", exe(filepath.Join("bin", "gobind")), "-tags", "ebitenmobilegobind", filepath.Join("src", "gobind.go")); err != nil {
return tmp, err
}
if err := runCommand("gomobile", []string{"init"}, nil); err != nil {
return tmp, err
}
return tmp, nil
}