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package main
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"github.com/containers/buildah"
"github.com/containers/buildah/define"
"github.com/containers/buildah/imagebuildah"
"github.com/containers/storage"
"github.com/containers/storage/pkg/unshare"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
func main() {
if buildah.InitReexec() {
return
}
unshare.MaybeReexecUsingUserNamespace(false)
buildStoreOptions, err := storage.DefaultStoreOptions()
if err != nil {
panic(err)
}
buildStore, err := storage.GetStore(buildStoreOptions)
if err != nil {
panic(err)
}
defer func() {
if _, err := buildStore.Shutdown(false); err != nil {
if !errors.Is(err, storage.ErrLayerUsedByContainer) {
fmt.Printf("failed to shutdown storage: %q", err)
}
}
}()
d, err := os.MkdirTemp("", "")
if err != nil {
panic(err)
}
defer os.RemoveAll(d)
dockerfile := filepath.Join(d, "Dockerfile")
f, err := os.Create(dockerfile)
if err != nil {
panic(err)
}
fmt.Fprintf(f, "FROM quay.io/libpod/alpine\nRUN echo CUT START; find /sys/fs/cgroup -print | sort ; echo CUT END")
f.Close()
buildOptions := define.BuildOptions{
ContextDirectory: d,
NamespaceOptions: []define.NamespaceOption{
{Name: string(specs.NetworkNamespace), Host: true},
},
}
_, _, err = imagebuildah.BuildDockerfiles(context.TODO(), buildStore, buildOptions, dockerfile)
if err != nil {
panic(err)
}
}
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