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|
package main
import (
"context"
"flag"
"os"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/util/system"
)
type buildOpt struct {
withContainerd bool
containerd string
runc 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.Parse()
bk := buildkit(opt)
out := bk.Run(llb.Shlex("ls -l /bin")) // debug output
dt, err := out.Marshal(context.TODO(), llb.LinuxAmd64)
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, ref string, g ...llb.GitOption) 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, llb.Git(repo, ref, g...))
return es.AddMount(dir+"/bin", llb.Scratch())
}
}
func runc(version string) llb.State {
return goRepo(goBuildBase(), "github.com/opencontainers/runc", version)(
llb.Shlex("go build -o ./bin/runc ./"),
)
}
func containerd(version string) llb.State {
return goRepo(
goBuildBase().
Run(llb.Shlex("apk add --no-cache btrfs-progs-dev")).Root(),
"github.com/containerd/containerd", version, llb.KeepGitDir())(
llb.Shlex("make bin/containerd"),
)
}
func buildkit(opt buildOpt) llb.State {
run := goRepo(goBuildBase(), "github.com/moby/buildkit", "master")
buildkitd := run(llb.Shlex("go build -o ./bin/buildkitd ./cmd/buildkitd"))
buildctl := run(llb.Shlex("go build -o ./bin/buildctl ./cmd/buildctl"))
r := llb.Image("docker.io/library/alpine:latest").With(
copyAll(buildctl, "/bin"),
copyAll(buildkitd, "/bin"),
copyAll(runc(opt.runc), "/bin"),
)
if opt.withContainerd {
r = r.With(
copyAll(containerd(opt.containerd), "/bin"),
)
}
return r
}
func copyAll(src llb.State, destPath string) llb.StateOption {
return copyFrom(src, "/.", destPath)
}
// copyFrom has similar semantics as `COPY --from`
func copyFrom(src llb.State, srcPath, destPath string) llb.StateOption {
return func(s llb.State) llb.State {
return copy(src, srcPath, s, destPath)
}
}
// copy copies files between 2 states using cp until there is no copyOp
func copy(src llb.State, srcPath string, dest llb.State, destPath string) llb.State {
cpImage := llb.Image("docker.io/library/alpine:latest")
cp := cpImage.Run(llb.Shlexf("cp -a /src%s /dest%s", srcPath, destPath))
cp.AddMount("/src", src)
return cp.AddMount("/dest", dest)
}
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