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export.go
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export.go
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package local
import (
"context"
"os"
"strings"
"time"
"github.com/moby/buildkit/cache"
"github.com/moby/buildkit/exporter"
"github.com/moby/buildkit/exporter/containerimage/exptypes"
"github.com/moby/buildkit/exporter/util/epoch"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/filesync"
"github.com/moby/buildkit/util/progress"
"github.com/pkg/errors"
"github.com/tonistiigi/fsutil"
fstypes "github.com/tonistiigi/fsutil/types"
"golang.org/x/sync/errgroup"
"golang.org/x/time/rate"
)
const (
keyAttestationPrefix = "attestation-prefix"
)
type Opt struct {
SessionManager *session.Manager
}
type localExporter struct {
opt Opt
// session manager
}
func New(opt Opt) (exporter.Exporter, error) {
le := &localExporter{opt: opt}
return le, nil
}
func (e *localExporter) Resolve(ctx context.Context, opt map[string]string) (exporter.ExporterInstance, error) {
tm, _, err := epoch.ParseExporterAttrs(opt)
if err != nil {
return nil, err
}
i := &localExporterInstance{
localExporter: e,
opts: CreateFSOpts{
Epoch: tm,
},
}
for k, v := range opt {
switch k {
case keyAttestationPrefix:
i.opts.AttestationPrefix = v
}
}
return i, nil
}
type localExporterInstance struct {
*localExporter
opts CreateFSOpts
}
func (e *localExporterInstance) Name() string {
return "exporting to client directory"
}
func (e *localExporter) Config() *exporter.Config {
return exporter.NewConfig()
}
func (e *localExporterInstance) Export(ctx context.Context, inp *exporter.Source, sessionID string) (map[string]string, exporter.DescriptorReference, error) {
timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
if e.opts.Epoch == nil {
if tm, ok, err := epoch.ParseSource(inp); err != nil {
return nil, nil, err
} else if ok {
e.opts.Epoch = tm
}
}
caller, err := e.opt.SessionManager.Get(timeoutCtx, sessionID, false)
if err != nil {
return nil, nil, err
}
isMap := len(inp.Refs) > 0
if _, ok := inp.Metadata[exptypes.ExporterPlatformsKey]; isMap && !ok {
return nil, nil, errors.Errorf("unable to export multiple refs, missing platforms mapping")
}
p, err := exptypes.ParsePlatforms(inp.Metadata)
if err != nil {
return nil, nil, err
}
if !isMap && len(p.Platforms) > 1 {
return nil, nil, errors.Errorf("unable to export multiple platforms without map")
}
now := time.Now().Truncate(time.Second)
export := func(ctx context.Context, k string, ref cache.ImmutableRef, attestations []exporter.Attestation) func() error {
return func() error {
outputFS, cleanup, err := CreateFS(ctx, sessionID, k, ref, attestations, now, e.opts)
if err != nil {
return err
}
if cleanup != nil {
defer cleanup()
}
lbl := "copying files"
if isMap {
lbl += " " + k
st := fstypes.Stat{
Mode: uint32(os.ModeDir | 0755),
Path: strings.Replace(k, "/", "_", -1),
}
if e.opts.Epoch != nil {
st.ModTime = e.opts.Epoch.UnixNano()
}
outputFS, err = fsutil.SubDirFS([]fsutil.Dir{{FS: outputFS, Stat: st}})
if err != nil {
return err
}
}
progress := NewProgressHandler(ctx, lbl)
if err := filesync.CopyToCaller(ctx, outputFS, caller, progress); err != nil {
return err
}
return nil
}
}
eg, ctx := errgroup.WithContext(ctx)
if len(p.Platforms) > 0 {
for _, p := range p.Platforms {
r, ok := inp.FindRef(p.ID)
if !ok {
return nil, nil, errors.Errorf("failed to find ref for ID %s", p.ID)
}
eg.Go(export(ctx, p.ID, r, inp.Attestations[p.ID]))
}
} else {
eg.Go(export(ctx, "", inp.Ref, nil))
}
if err := eg.Wait(); err != nil {
return nil, nil, err
}
return nil, nil, nil
}
func NewProgressHandler(ctx context.Context, id string) func(int, bool) {
limiter := rate.NewLimiter(rate.Every(100*time.Millisecond), 1)
pw, _, _ := progress.NewFromContext(ctx)
now := time.Now()
st := progress.Status{
Started: &now,
Action: "transferring",
}
pw.Write(id, st)
return func(s int, last bool) {
if last || limiter.Allow() {
st.Current = s
if last {
now := time.Now()
st.Completed = &now
}
pw.Write(id, st)
if last {
pw.Close()
}
}
}
}