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makefsimage.go
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makefsimage.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package binary
import (
"context"
"io"
"os"
"path/filepath"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/klauspost/compress/zstd"
"namespacelabs.dev/foundation/framework/rpcerrors/multierr"
"namespacelabs.dev/foundation/internal/artifacts/oci"
"namespacelabs.dev/foundation/internal/build"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/runtime/docker"
"namespacelabs.dev/foundation/internal/runtime/rtypes"
"namespacelabs.dev/foundation/std/pkggraph"
"namespacelabs.dev/foundation/std/tasks"
)
type makeExt4Image struct {
spec build.Spec
target string
size int64
raw bool
}
func validateExt4(size int64) error {
if size == 0 {
return fnerrors.BadInputError("size must be specified")
}
return nil
}
func (m makeExt4Image) BuildImage(ctx context.Context, env pkggraph.SealedContext, conf build.Configuration) (compute.Computable[oci.Image], error) {
inner, err := m.spec.BuildImage(ctx, env, conf)
if err != nil {
return nil, err
}
if err := validateExt4(m.size); err != nil {
return nil, err
}
return MakeDisk(inner, m.target, m.size, m.raw), nil
}
func MakeDisk(inner compute.Computable[oci.Image], target string, size int64, raw bool) compute.Computable[oci.Image] {
return compute.Transform("binary.make-ext4-image", inner, func(ctx context.Context, img oci.Image) (oci.Image, error) {
dir, err := os.MkdirTemp("", "ext4")
if err != nil {
return nil, err
}
compute.On(ctx).Cleanup(tasks.Action("remove tmpdir"), func(ctx context.Context) error {
return os.RemoveAll(dir)
})
tmpDir := filepath.Join(dir, "out")
target := filepath.Join(tmpDir, target)
if err := MakeExt4Image(ctx, img, dir, target, size); err != nil {
return nil, err
}
if raw {
comp := target + ".zstd"
outf, err := os.Create(comp)
if err != nil {
return nil, err
}
defer outf.Close()
enc, err := zstd.NewWriter(outf)
if err != nil {
return nil, err
}
src, err := os.Open(target)
if err != nil {
return nil, err
}
if _, err := io.Copy(enc, src); err != nil {
return nil, err
}
if err := enc.Close(); err != nil {
return nil, err
}
if err := outf.Close(); err != nil {
return nil, err
}
layer, err := oci.RawZstdLayerFrom(comp, "application/x-namespace-raw-zstd-ext4")
if err != nil {
return nil, err
}
return mutate.AppendLayers(empty.Image, layer)
}
layer, err := oci.LayerFromFS(ctx, os.DirFS(tmpDir))
if err != nil {
return nil, err
}
return mutate.AppendLayers(empty.Image, layer)
})
}
func (m makeExt4Image) PlatformIndependent() bool { return m.spec.PlatformIndependent() }
func toExt4Image(ctx context.Context, tmpdir string, image oci.Image, target string, size int64) error {
tmpFile := filepath.Join(tmpdir, "image.tar")
if err := flattenToFile(ctx, tmpFile, image); err != nil {
return err
}
f, err := os.Create(target)
if err != nil {
return err
}
if err := f.Close(); err != nil {
return err
}
if err := os.Truncate(target, size); err != nil {
return err
}
// nsdev build-binary internal/build/binary/imageutil --base_repository=registry.eu-services.namespace.systems --build_platforms linux/arm64,linux/amd64
img, err := oci.ParseImageID("registry.eu-services.namespace.systems/namespacelabs.dev/foundation/internal/build/binary/imageutil@sha256:afbded41542118d6b535735bbe692ca8d5fabd8e139edbc43014d4345dc25563")
if err != nil {
return err
}
v, err := oci.FetchRemoteImage(ctx, img, oci.RegistryAccess{PublicImage: true})
if err != nil {
return err
}
h, _ := image.Digest()
out := console.Output(ctx, "make-ext4-image "+h.Hex)
var run rtypes.RunToolOpts
run.Privileged = true
run.IO.Stdout = out
run.IO.Stderr = out
run.WorkingDir = "/"
run.Image = v
run.Command = []string{"/bake", "-source", "/source", "-target", "/target"}
run.Mounts = append(run.Mounts,
&rtypes.LocalMapping{
HostPath: target,
ContainerPath: "/target",
},
&rtypes.LocalMapping{
HostPath: tmpFile,
ContainerPath: "/source",
},
)
return docker.Runtime().Run(ctx, run)
}
func flattenToFile(ctx context.Context, filepath string, image oci.Image) error {
return tasks.Action("binary.make-ext4-image.write-image-as-tar").Run(ctx, func(ctx context.Context) error {
f, err := os.Create(filepath)
if err != nil {
return err
}
r := mutate.Extract(image)
_, copyErr := io.Copy(f, r)
rErr := r.Close()
fErr := f.Close()
return multierr.New(copyErr, rErr, fErr)
})
}
func MakeExt4Image(ctx context.Context, image oci.Image, tmpdir, target string, size int64) error {
if err := validateExt4(size); err != nil {
return err
}
mount := filepath.Join(tmpdir, "mount")
if err := os.Mkdir(mount, 0755); err != nil {
return err
}
if err := os.MkdirAll(filepath.Dir(target), 0755); err != nil {
return err
}
if err := toExt4Image(ctx, tmpdir, image, target, size); err != nil {
return err
}
return nil
}