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go.go
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go.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"text/template"
)
type OutputTemplateData struct {
Dir string
OS string
Arch string
}
type CompileOpts struct {
PackagePath string
Platform Platform
OutputTpl string
Ldflags string
Gcflags string
Asmflags string
Tags string
Cgo bool
Rebuild bool
GoCmd string
}
// GoCrossCompile
func GoCrossCompile(opts *CompileOpts) error {
env := append(os.Environ(),
"GOOS="+opts.Platform.OS,
"GOARCH="+opts.Platform.Arch)
// If we're building for our own platform, then enable cgo always. We
// respect the CGO_ENABLED flag if that is explicitly set on the platform.
if !opts.Cgo && os.Getenv("CGO_ENABLED") != "0" {
opts.Cgo = runtime.GOOS == opts.Platform.OS &&
runtime.GOARCH == opts.Platform.Arch
}
// If cgo is enabled then set that env var
if opts.Cgo {
env = append(env, "CGO_ENABLED=1")
} else {
env = append(env, "CGO_ENABLED=0")
}
var outputPath bytes.Buffer
tpl, err := template.New("output").Parse(opts.OutputTpl)
if err != nil {
return err
}
tplData := OutputTemplateData{
Dir: filepath.Base(opts.PackagePath),
OS: opts.Platform.OS,
Arch: opts.Platform.Arch,
}
if err := tpl.Execute(&outputPath, &tplData); err != nil {
return err
}
if opts.Platform.OS == "windows" {
outputPath.WriteString(".exe")
}
// Determine the full path to the output so that we can change our
// working directory when executing go build.
outputPathReal := outputPath.String()
outputPathReal, err = filepath.Abs(outputPathReal)
if err != nil {
return err
}
// Go prefixes the import directory with '_' when it is outside
// the GOPATH.For this, we just drop it since we move to that
// directory to build.
chdir := ""
if opts.PackagePath[0] == '_' {
if runtime.GOOS == "windows" {
// We have to replace weird paths like this:
//
// _/c_/Users
//
// With:
//
// c:\Users
//
re := regexp.MustCompile("^/([a-zA-Z])_/")
chdir = re.ReplaceAllString(opts.PackagePath[1:], "$1:\\")
chdir = strings.Replace(chdir, "/", "\\", -1)
} else {
chdir = opts.PackagePath[1:]
}
opts.PackagePath = ""
}
args := []string{"build"}
if opts.Rebuild {
args = append(args, "-a")
}
args = append(args,
"-gcflags", opts.Gcflags,
"-ldflags", opts.Ldflags,
"-asmflags", opts.Asmflags,
"-tags", opts.Tags,
"-o", outputPathReal,
opts.PackagePath)
_, err = execGo(opts.GoCmd, env, chdir, args...)
return err
}
// GoMainDirs returns the file paths to the packages that are "main"
// packages, from the list of packages given. The list of packages can
// include relative paths, the special "..." Go keyword, etc.
func GoMainDirs(packages []string, GoCmd string) ([]string, error) {
args := make([]string, 0, len(packages)+3)
args = append(args, "list", "-f", "{{.Name}}|{{.ImportPath}}")
args = append(args, packages...)
output, err := execGo(GoCmd, nil, "", args...)
if err != nil {
return nil, err
}
results := make([]string, 0, len(output))
for _, line := range strings.Split(output, "\n") {
if line == "" {
continue
}
parts := strings.SplitN(line, "|", 2)
if len(parts) != 2 {
log.Printf("Bad line reading packages: %s", line)
continue
}
if parts[0] == "main" {
results = append(results, parts[1])
}
}
return results, nil
}
// GoRoot returns the GOROOT value for the compiled `go` binary.
func GoRoot() (string, error) {
output, err := execGo("go", nil, "", "env", "GOROOT")
if err != nil {
return "", err
}
return strings.TrimSpace(output), nil
}
// GoVersion reads the version of `go` that is on the PATH. This is done
// instead of `runtime.Version()` because it is possible to run gox against
// another Go version.
func GoVersion() (string, error) {
// NOTE: We use `go run` instead of `go version` because the output
// of `go version` might change whereas the source is guaranteed to run
// for some time thanks to Go's compatibility guarantee.
td, err := ioutil.TempDir("", "gox")
if err != nil {
return "", err
}
defer os.RemoveAll(td)
// Write the source code for the program that will generate the version
sourcePath := filepath.Join(td, "version.go")
if err := ioutil.WriteFile(sourcePath, []byte(versionSource), 0644); err != nil {
return "", err
}
// Execute and read the version, which will be the only thing on stdout.
return execGo("go", nil, "", "run", sourcePath)
}
// GoVersionParts parses the version numbers from the version itself
// into major and minor: 1.5, 1.4, etc.
func GoVersionParts() (result [2]int, err error) {
version, err := GoVersion()
if err != nil {
return
}
_, err = fmt.Sscanf(version, "go%d.%d", &result[0], &result[1])
return
}
func execGo(GoCmd string, env []string, dir string, args ...string) (string, error) {
var stderr, stdout bytes.Buffer
cmd := exec.Command(GoCmd, args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if env != nil {
cmd.Env = env
}
if dir != "" {
cmd.Dir = dir
}
if err := cmd.Run(); err != nil {
err = fmt.Errorf("%s\nStderr: %s", err, stderr.String())
return "", err
}
return stdout.String(), nil
}
const versionSource = `package main
import (
"fmt"
"runtime"
)
func main() {
fmt.Print(runtime.Version())
}`