forked from goreleaser/goreleaser
/
build.go
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/
build.go
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package golang
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"os"
"os/exec"
"strings"
"github.com/apex/log"
"github.com/goreleaser/goreleaser/internal/artifact"
"github.com/goreleaser/goreleaser/internal/tmpl"
api "github.com/goreleaser/goreleaser/pkg/build"
"github.com/goreleaser/goreleaser/pkg/config"
"github.com/goreleaser/goreleaser/pkg/context"
"github.com/pkg/errors"
)
// Default builder instance
var Default = &Builder{}
func init() {
api.Register("go", Default)
}
// Builder is golang builder
type Builder struct{}
// WithDefaults sets the defaults for a golang build and returns it
func (*Builder) WithDefaults(build config.Build) config.Build {
if build.Main == "" {
build.Main = "."
}
if len(build.Goos) == 0 {
build.Goos = []string{"linux", "darwin"}
}
if len(build.Goarch) == 0 {
build.Goarch = []string{"amd64", "386"}
}
if len(build.Goarm) == 0 {
build.Goarm = []string{"6"}
}
if len(build.Ldflags) == 0 {
build.Ldflags = []string{"-s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}"}
}
if len(build.Targets) == 0 {
build.Targets = matrix(build)
}
return build
}
// Build builds a golang build
func (*Builder) Build(ctx *context.Context, build config.Build, options api.Options) error {
if err := checkMain(build); err != nil {
return err
}
cmd := []string{"go", "build"}
cmd = append(cmd, build.Flags...)
asmflags, err := processFlags(ctx, build.Asmflags, "-asmflags=")
if err != nil {
return err
}
cmd = append(cmd, asmflags...)
gcflags, err := processFlags(ctx, build.Gcflags, "-gcflags=")
if err != nil {
return err
}
cmd = append(cmd, gcflags...)
ldflags, err := processFlags(ctx, build.Ldflags, "-ldflags=")
if err != nil {
return err
}
cmd = append(cmd, ldflags...)
cmd = append(cmd, "-o", options.Path, build.Main)
target, err := newBuildTarget(options.Target)
if err != nil {
return err
}
var env = append(build.Env, target.Env()...)
if err := run(ctx, cmd, env); err != nil {
return errors.Wrapf(err, "failed to build for %s", options.Target)
}
ctx.Artifacts.Add(artifact.Artifact{
Type: artifact.Binary,
Path: options.Path,
Name: options.Name,
Goos: target.os,
Goarch: target.arch,
Goarm: target.arm,
Extra: map[string]string{
"Binary": build.Binary,
"Ext": options.Ext,
},
})
return nil
}
func processFlags(ctx *context.Context, flags []string, flagPrefix string) ([]string, error) {
processed := make([]string, 0, len(flags))
for _, rawFlag := range flags {
flag, err := tmpl.New(ctx).Apply(rawFlag)
if err != nil {
return nil, err
}
processed = append(processed, flagPrefix+flag)
}
return processed, nil
}
func run(ctx *context.Context, command, env []string) error {
/* #nosec */
var cmd = exec.CommandContext(ctx, command[0], command[1:]...)
var log = log.WithField("env", env).WithField("cmd", command)
cmd.Env = append(cmd.Env, os.Environ()...)
cmd.Env = append(cmd.Env, env...)
log.WithField("cmd", command).WithField("env", env).Debug("running")
if out, err := cmd.CombinedOutput(); err != nil {
log.WithError(err).Debug("failed")
return errors.New(string(out))
}
return nil
}
type buildTarget struct {
os, arch, arm string
}
func newBuildTarget(s string) (buildTarget, error) {
var t = buildTarget{}
parts := strings.Split(s, "_")
if len(parts) < 2 {
return t, fmt.Errorf("%s is not a valid build target", s)
}
t.os = parts[0]
t.arch = parts[1]
if len(parts) == 3 {
t.arm = parts[2]
}
return t, nil
}
func (b buildTarget) Env() []string {
return []string{
"GOOS=" + b.os,
"GOARCH=" + b.arch,
"GOARM=" + b.arm,
}
}
func checkMain(build config.Build) error {
var main = build.Main
if main == "" {
main = "."
}
stat, ferr := os.Stat(main)
if ferr != nil {
return ferr
}
if stat.IsDir() {
packs, err := parser.ParseDir(token.NewFileSet(), main, nil, 0)
if err != nil {
return errors.Wrapf(err, "failed to parse dir: %s", main)
}
for _, pack := range packs {
for _, file := range pack.Files {
if hasMain(file) {
return nil
}
}
}
return fmt.Errorf("build for %s does not contain a main function", build.Binary)
}
file, err := parser.ParseFile(token.NewFileSet(), main, nil, 0)
if err != nil {
return errors.Wrapf(err, "failed to parse file: %s", main)
}
if hasMain(file) {
return nil
}
return fmt.Errorf("build for %s does not contain a main function", build.Binary)
}
func hasMain(file *ast.File) bool {
for _, decl := range file.Decls {
fn, isFn := decl.(*ast.FuncDecl)
if !isFn {
continue
}
if fn.Name.Name == "main" && fn.Recv == nil {
return true
}
}
return false
}