goreleaser/pipeline/build/build.go

package build

import (
	"errors"
	"log"
	"os"
	"os/exec"
	"runtime"
	"strings"

	"github.com/goreleaser/goreleaser/context"
	"golang.org/x/sync/errgroup"
)

// Pipe for build
type Pipe struct{}

// Description of the pipe
func (Pipe) Description() string {
	return "Building binaries"
}

// Run the pipe
func (Pipe) Run(ctx *context.Context) error {
	if ctx.Config.Build.Hooks.Pre != "" {
		log.Println("Running pre-build hook", ctx.Config.Build.Hooks.Pre)
		cmd := strings.Fields(ctx.Config.Build.Hooks.Pre)
		if err := run(runtime.GOOS, runtime.GOARCH, cmd); err != nil {
			return err
		}
	}
	var g errgroup.Group
	for _, goos := range ctx.Config.Build.Goos {
		for _, goarch := range ctx.Config.Build.Goarch {
			goos := goos
			goarch := goarch
			if !valid(goos, goarch) {
				continue
			}
			name, err := nameFor(ctx, goos, goarch)
			if err != nil {
				return err
			}
			ctx.Archives[goos+goarch] = name
			g.Go(func() error {
				return build(name, goos, goarch, ctx)
			})
		}
	}
	err := g.Wait()
	if ctx.Config.Build.Hooks.Post != "" {
		log.Println("Running post-build hook", ctx.Config.Build.Hooks.Post)
		cmd := strings.Fields(ctx.Config.Build.Hooks.Post)
		if err := run(runtime.GOOS, runtime.GOARCH, cmd); err != nil {
			return err
		}
	}
	return err
}

func build(name, goos, goarch string, ctx *context.Context) error {
	ldflags := ctx.Config.Build.Ldflags + " -X main.version=" + ctx.Version
	output := "dist/" + name + "/" + ctx.Config.Build.Binary + extFor(goos)
	log.Println("Building", output)
	cmd := []string{"go", "build"}
	if ctx.Config.Build.Flags != "" {
		cmd = append(cmd, strings.Fields(ctx.Config.Build.Flags)...)
	}
	cmd = append(cmd, "-ldflags="+ldflags, "-o", output, ctx.Config.Build.Main)
	if err := run(goos, goarch, cmd); err != nil {
		return err
	}
	return nil
}

func run(goos, goarch string, command []string) error {
	cmd := exec.Command(command[0], command[1:]...)
	cmd.Env = append(cmd.Env, os.Environ()...)
	cmd.Env = append(cmd.Env, "GOOS="+goos, "GOARCH="+goarch)
	if out, err := cmd.CombinedOutput(); err != nil {
		return errors.New(string(out))
	}
	return nil
}

// list from https://golang.org/doc/install/source#environment
var valids = []string{
	"androidarm",
	"darwin386",
	"darwinamd64",
	"darwinarm",
	"darwinarm64",
	"dragonflyamd64",
	"freebsd386",
	"freebsdamd64",
	"freebsdarm",
	"linux386",
	"linuxamd64",
	"linuxarm",
	"linuxarm64",
	"linuxppc64",
	"linuxppc64le",
	"linuxmips",
	"linuxmipsle",
	"linuxmips64",
	"linuxmips64le",
	"netbsd386",
	"netbsdamd64",
	"netbsdarm",
	"openbsd386",
	"openbsdamd64",
	"openbsdarm",
	"plan9386",
	"plan9amd64",
	"solarisamd64",
	"windows386",
	"windowsamd64",
}

func valid(goos, goarch string) bool {
	var s = goos + goarch
	for _, a := range valids {
		if a == s {
			return true
		}
	}
	return false
}