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worker.go
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worker.go
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package base
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/diff"
"github.com/containerd/containerd/gc"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/leases"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/remotes/docker"
"github.com/docker/docker/pkg/idtools"
"github.com/moby/buildkit/cache"
"github.com/moby/buildkit/cache/metadata"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/executor"
"github.com/moby/buildkit/exporter"
imageexporter "github.com/moby/buildkit/exporter/containerimage"
localexporter "github.com/moby/buildkit/exporter/local"
ociexporter "github.com/moby/buildkit/exporter/oci"
tarexporter "github.com/moby/buildkit/exporter/tar"
"github.com/moby/buildkit/frontend"
"github.com/moby/buildkit/identity"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/snapshot"
"github.com/moby/buildkit/snapshot/imagerefchecker"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/solver/llbsolver/mounts"
"github.com/moby/buildkit/solver/llbsolver/ops"
"github.com/moby/buildkit/solver/pb"
"github.com/moby/buildkit/source"
"github.com/moby/buildkit/source/containerimage"
"github.com/moby/buildkit/source/git"
"github.com/moby/buildkit/source/http"
"github.com/moby/buildkit/source/local"
"github.com/moby/buildkit/util/archutil"
"github.com/moby/buildkit/util/bklog"
"github.com/moby/buildkit/util/progress"
"github.com/moby/buildkit/util/progress/controller"
digest "github.com/opencontainers/go-digest"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
"golang.org/x/sync/semaphore"
)
const labelCreatedAt = "buildkit/createdat"
// TODO: this file should be removed. containerd defines ContainerdWorker, oci defines OCIWorker. There is no base worker.
// WorkerOpt is specific to a worker.
// See also CommonOpt.
type WorkerOpt struct {
ID string
Labels map[string]string
Platforms []ocispecs.Platform
GCPolicy []client.PruneInfo
Executor executor.Executor
Snapshotter snapshot.Snapshotter
ContentStore content.Store
Applier diff.Applier
Differ diff.Comparer
ImageStore images.Store // optional
RegistryHosts docker.RegistryHosts
IdentityMapping *idtools.IdentityMapping
LeaseManager leases.Manager
GarbageCollect func(context.Context) (gc.Stats, error)
ParallelismSem *semaphore.Weighted
MetadataStore *metadata.Store
MountPoolRoot string
}
// Worker is a local worker instance with dedicated snapshotter, cache, and so on.
// TODO: s/Worker/OpWorker/g ?
type Worker struct {
WorkerOpt
CacheMgr cache.Manager
SourceManager *source.Manager
imageWriter *imageexporter.ImageWriter
ImageSource *containerimage.Source
}
// NewWorker instantiates a local worker
func NewWorker(ctx context.Context, opt WorkerOpt) (*Worker, error) {
imageRefChecker := imagerefchecker.New(imagerefchecker.Opt{
ImageStore: opt.ImageStore,
ContentStore: opt.ContentStore,
})
cm, err := cache.NewManager(cache.ManagerOpt{
Snapshotter: opt.Snapshotter,
PruneRefChecker: imageRefChecker,
Applier: opt.Applier,
GarbageCollect: opt.GarbageCollect,
LeaseManager: opt.LeaseManager,
ContentStore: opt.ContentStore,
Differ: opt.Differ,
MetadataStore: opt.MetadataStore,
MountPoolRoot: opt.MountPoolRoot,
})
if err != nil {
return nil, err
}
sm, err := source.NewManager()
if err != nil {
return nil, err
}
is, err := containerimage.NewSource(containerimage.SourceOpt{
Snapshotter: opt.Snapshotter,
ContentStore: opt.ContentStore,
Applier: opt.Applier,
ImageStore: opt.ImageStore,
CacheAccessor: cm,
RegistryHosts: opt.RegistryHosts,
LeaseManager: opt.LeaseManager,
})
if err != nil {
return nil, err
}
sm.Register(is)
if err := git.Supported(); err == nil {
gs, err := git.NewSource(git.Opt{
CacheAccessor: cm,
})
if err != nil {
return nil, err
}
sm.Register(gs)
} else {
bklog.G(ctx).Warnf("git source cannot be enabled: %v", err)
}
hs, err := http.NewSource(http.Opt{
CacheAccessor: cm,
})
if err != nil {
return nil, err
}
sm.Register(hs)
ss, err := local.NewSource(local.Opt{
CacheAccessor: cm,
})
if err != nil {
return nil, err
}
sm.Register(ss)
iw, err := imageexporter.NewImageWriter(imageexporter.WriterOpt{
Snapshotter: opt.Snapshotter,
ContentStore: opt.ContentStore,
Applier: opt.Applier,
Differ: opt.Differ,
})
if err != nil {
return nil, err
}
leases, err := opt.LeaseManager.List(ctx, "labels.\"buildkit/lease.temporary\"")
if err != nil {
return nil, err
}
for _, l := range leases {
opt.LeaseManager.Delete(ctx, l)
}
return &Worker{
WorkerOpt: opt,
CacheMgr: cm,
SourceManager: sm,
imageWriter: iw,
ImageSource: is,
}, nil
}
func (w *Worker) ContentStore() content.Store {
return w.WorkerOpt.ContentStore
}
func (w *Worker) ID() string {
return w.WorkerOpt.ID
}
func (w *Worker) Labels() map[string]string {
return w.WorkerOpt.Labels
}
func (w *Worker) Platforms(noCache bool) []ocispecs.Platform {
if noCache {
for _, p := range archutil.SupportedPlatforms(noCache) {
exists := false
for _, pp := range w.WorkerOpt.Platforms {
if platforms.Only(pp).Match(p) {
exists = true
break
}
}
if !exists {
w.WorkerOpt.Platforms = append(w.WorkerOpt.Platforms, p)
}
}
}
return w.WorkerOpt.Platforms
}
func (w *Worker) GCPolicy() []client.PruneInfo {
return w.WorkerOpt.GCPolicy
}
func (w *Worker) LoadRef(ctx context.Context, id string, hidden bool) (cache.ImmutableRef, error) {
var opts []cache.RefOption
if hidden {
opts = append(opts, cache.NoUpdateLastUsed)
}
if id == "" {
// results can have nil refs if they are optimized out to be equal to scratch,
// i.e. Diff(A,A) == scratch
return nil, nil
}
var pg progress.Controller
optGetter := solver.CacheOptGetterOf(ctx)
if optGetter != nil {
if kv := optGetter(false, cache.ProgressKey{}); kv != nil {
if v, ok := kv[cache.ProgressKey{}].(progress.Controller); ok {
pg = v
}
}
}
ref, err := w.CacheMgr.Get(ctx, id, pg, opts...)
var needsRemoteProviders cache.NeedsRemoteProviderError
if errors.As(err, &needsRemoteProviders) {
if optGetter != nil {
var keys []interface{}
for _, dgst := range needsRemoteProviders {
keys = append(keys, cache.DescHandlerKey(dgst))
}
descHandlers := cache.DescHandlers(make(map[digest.Digest]*cache.DescHandler))
for k, v := range optGetter(true, keys...) {
if key, ok := k.(cache.DescHandlerKey); ok {
if handler, ok := v.(*cache.DescHandler); ok {
descHandlers[digest.Digest(key)] = handler
}
}
}
opts = append(opts, descHandlers)
ref, err = w.CacheMgr.Get(ctx, id, pg, opts...)
}
}
if err != nil {
return nil, errors.Wrap(err, "failed to load ref")
}
return ref, nil
}
func (w *Worker) Executor() executor.Executor {
return w.WorkerOpt.Executor
}
func (w *Worker) CacheManager() cache.Manager {
return w.CacheMgr
}
func (w *Worker) ResolveOp(v solver.Vertex, s frontend.FrontendLLBBridge, sm *session.Manager) (solver.Op, error) {
if baseOp, ok := v.Sys().(*pb.Op); ok {
switch op := baseOp.Op.(type) {
case *pb.Op_Source:
return ops.NewSourceOp(v, op, baseOp.Platform, w.SourceManager, w.ParallelismSem, sm, w)
case *pb.Op_Exec:
return ops.NewExecOp(v, op, baseOp.Platform, w.CacheMgr, w.ParallelismSem, sm, w.WorkerOpt.Executor, w)
case *pb.Op_File:
return ops.NewFileOp(v, op, w.CacheMgr, w.ParallelismSem, w)
case *pb.Op_Build:
return ops.NewBuildOp(v, op, s, w)
case *pb.Op_Merge:
return ops.NewMergeOp(v, op, w)
case *pb.Op_Diff:
return ops.NewDiffOp(v, op, w)
default:
return nil, errors.Errorf("no support for %T", op)
}
}
return nil, errors.Errorf("could not resolve %v", v)
}
func (w *Worker) PruneCacheMounts(ctx context.Context, ids []string) error {
mu := mounts.CacheMountsLocker()
mu.Lock()
defer mu.Unlock()
for _, id := range ids {
mds, err := mounts.SearchCacheDir(ctx, w.CacheMgr, id)
if err != nil {
return err
}
for _, md := range mds {
if err := md.SetCachePolicyDefault(); err != nil {
return err
}
if err := md.ClearCacheDirIndex(); err != nil {
return err
}
// if ref is unused try to clean it up right away by releasing it
if mref, err := w.CacheMgr.GetMutable(ctx, md.ID()); err == nil {
go mref.Release(context.TODO())
}
}
}
mounts.ClearActiveCacheMounts()
return nil
}
func (w *Worker) ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt, sm *session.Manager, g session.Group) (digest.Digest, []byte, error) {
return w.ImageSource.ResolveImageConfig(ctx, ref, opt, sm, g)
}
func (w *Worker) DiskUsage(ctx context.Context, opt client.DiskUsageInfo) ([]*client.UsageInfo, error) {
return w.CacheMgr.DiskUsage(ctx, opt)
}
func (w *Worker) Prune(ctx context.Context, ch chan client.UsageInfo, opt ...client.PruneInfo) error {
return w.CacheMgr.Prune(ctx, ch, opt...)
}
func (w *Worker) Exporter(name string, sm *session.Manager) (exporter.Exporter, error) {
switch name {
case client.ExporterImage:
return imageexporter.New(imageexporter.Opt{
Images: w.ImageStore,
SessionManager: sm,
ImageWriter: w.imageWriter,
RegistryHosts: w.RegistryHosts,
LeaseManager: w.LeaseManager,
})
case client.ExporterLocal:
return localexporter.New(localexporter.Opt{
SessionManager: sm,
})
case client.ExporterTar:
return tarexporter.New(tarexporter.Opt{
SessionManager: sm,
})
case client.ExporterOCI:
return ociexporter.New(ociexporter.Opt{
SessionManager: sm,
ImageWriter: w.imageWriter,
Variant: ociexporter.VariantOCI,
LeaseManager: w.LeaseManager,
})
case client.ExporterDocker:
return ociexporter.New(ociexporter.Opt{
SessionManager: sm,
ImageWriter: w.imageWriter,
Variant: ociexporter.VariantDocker,
LeaseManager: w.LeaseManager,
})
default:
return nil, errors.Errorf("exporter %q could not be found", name)
}
}
func (w *Worker) FromRemote(ctx context.Context, remote *solver.Remote) (ref cache.ImmutableRef, err error) {
if cd, ok := remote.Provider.(interface {
CheckDescriptor(context.Context, ocispecs.Descriptor) error
}); ok && len(remote.Descriptors) > 0 {
var eg errgroup.Group
for _, desc := range remote.Descriptors {
desc := desc
eg.Go(func() error {
if err := cd.CheckDescriptor(ctx, desc); err != nil {
return err
}
return nil
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
}
var pg progress.Controller
optGetter := solver.CacheOptGetterOf(ctx)
if optGetter != nil {
if kv := optGetter(false, cache.ProgressKey{}); kv != nil {
if v, ok := kv[cache.ProgressKey{}].(progress.Controller); ok {
pg = v
}
}
}
if pg == nil {
pg = &controller.Controller{
WriterFactory: progress.FromContext(ctx),
}
}
descHandler := &cache.DescHandler{
Provider: func(session.Group) content.Provider { return remote.Provider },
Progress: pg,
}
snapshotLabels := func([]ocispecs.Descriptor, int) map[string]string { return nil }
if cd, ok := remote.Provider.(interface {
SnapshotLabels([]ocispecs.Descriptor, int) map[string]string
}); ok {
snapshotLabels = cd.SnapshotLabels
}
descHandlers := cache.DescHandlers(make(map[digest.Digest]*cache.DescHandler))
for i, desc := range remote.Descriptors {
descHandlers[desc.Digest] = &cache.DescHandler{
Provider: descHandler.Provider,
Progress: descHandler.Progress,
Annotations: desc.Annotations,
SnapshotLabels: snapshotLabels(remote.Descriptors, i),
}
}
var current cache.ImmutableRef
for i, desc := range remote.Descriptors {
tm := time.Now()
if tmstr, ok := desc.Annotations[labelCreatedAt]; ok {
if err := (&tm).UnmarshalText([]byte(tmstr)); err != nil {
if current != nil {
current.Release(context.TODO())
}
return nil, err
}
}
descr := fmt.Sprintf("imported %s", remote.Descriptors[i].Digest)
if v, ok := desc.Annotations["buildkit/description"]; ok {
descr = v
}
opts := []cache.RefOption{
cache.WithDescription(descr),
cache.WithCreationTime(tm),
descHandlers,
}
if dh, ok := descHandlers[desc.Digest]; ok {
if ref, ok := dh.Annotations["containerd.io/distribution.source.ref"]; ok {
opts = append(opts, cache.WithImageRef(ref)) // can set by registry cache importer
}
}
ref, err := w.CacheMgr.GetByBlob(ctx, desc, current, opts...)
if current != nil {
current.Release(context.TODO())
}
if err != nil {
return nil, err
}
current = ref
}
return current, nil
}
// ID reads the worker id from the `workerid` file.
// If not exist, it creates a random one,
func ID(root string) (string, error) {
f := filepath.Join(root, "workerid")
b, err := ioutil.ReadFile(f)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
id := identity.NewID()
err := ioutil.WriteFile(f, []byte(id), 0400)
return id, err
}
return "", err
}
return string(b), nil
}