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package main
import (
"context"
"flag"
"os"
"path/filepath"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/util/system"
)
type buildOpt struct {
buildkit string
containerd string
runc string
withContainerd bool
installPrefix string
}
func main() {
var opt buildOpt
flag.BoolVar(&opt.withContainerd, "with-containerd", true, "enable containerd worker")
flag.StringVar(&opt.containerd, "containerd", "v1.7.2", "containerd version")
flag.StringVar(&opt.runc, "runc", "v1.1.7", "runc version")
flag.StringVar(&opt.buildkit, "buildkit", "master", "buildkit version")
flag.StringVar(&opt.installPrefix, "prefix", "/usr/local/bin", "path under which binaries should be installed")
flag.Parse()
bk := buildkit(opt)
out := bk
dt, err := out.Marshal(context.TODO())
if err != nil {
panic(err)
}
llb.WriteTo(dt, os.Stdout)
}
func goBuildBase() llb.State {
goAlpine := llb.Image("docker.io/library/golang:1.23-alpine")
return goAlpine.
AddEnv("PATH", "/usr/local/go/bin:"+system.DefaultPathEnvUnix).
AddEnv("GOPATH", "/go").
Run(llb.Shlex("apk add --no-cache g++ linux-headers libseccomp-dev make")).Root()
}
func goRepo(s llb.State, repo string, src llb.State) func(ro ...llb.RunOption) llb.State {
dir := "/go/src/" + repo
return func(ro ...llb.RunOption) llb.State {
es := s.Dir(dir).Run(ro...)
es.AddMount(dir, src, llb.Readonly)
return es.AddMount("/out", llb.Scratch())
}
}
func runc(version string) llb.State {
repo := "github.com/opencontainers/runc"
src := llb.Git(repo, version)
if version == "local" {
src = llb.Local("runc-src")
}
return goRepo(goBuildBase(), repo, src)(
llb.Shlex("go build -o /out/runc ./"),
)
}
func containerd(version string) llb.State {
repo := "github.com/containerd/containerd"
src := llb.Git(repo, version, llb.KeepGitDir())
if version == "local" {
src = llb.Local("containerd-src")
}
return goRepo(
goBuildBase().
Run(llb.Shlex("apk add --no-cache btrfs-progs-dev")).Root(),
repo, src)(
llb.Shlex("go build -o /out/containerd ./cmd/containerd"),
)
}
func buildkit(opt buildOpt) llb.State {
repo := "github.com/moby/buildkit"
src := llb.Git(repo, opt.buildkit)
if opt.buildkit == "local" {
src = llb.Local("buildkit-src")
}
run := goRepo(goBuildBase(), repo, src)
buildkitd := prefixed(run(llb.Shlex("go build -o /out/buildkitd ./cmd/buildkitd")), opt.installPrefix)
buildctl := prefixed(run(llb.Shlex("go build -o /out/buildctl ./cmd/buildctl")), opt.installPrefix)
inputs := []llb.State{buildctl, buildkitd, prefixed(runc(opt.runc), opt.installPrefix)}
if opt.withContainerd {
inputs = append(inputs, prefixed(containerd(opt.containerd), opt.installPrefix), buildkitd)
}
return llb.Merge(inputs)
}
func prefixed(st llb.State, prefix string) llb.State {
prefix = filepath.Clean(prefix)
if prefix == "/" {
return st
}
return llb.Scratch().File(llb.Copy(st, "/", prefix, &llb.CopyInfo{CreateDestPath: true}))
}
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