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push.go
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push.go
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package images
import (
gocontext "context"
"os"
"sync"
"text/tabwriter"
"time"
"github.com/containerd/containerd"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/containerd/containerd/cmd/ctr/commands/content"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/progress"
"github.com/containerd/containerd/remotes"
"github.com/containerd/containerd/remotes/docker"
digest "github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/urfave/cli"
"golang.org/x/sync/errgroup"
)
var pushCommand = cli.Command{
Name: "push",
Usage: "push an image to a remote",
ArgsUsage: "[flags] <remote> [<local>]",
Description: `Pushes an image reference from containerd.
All resources associated with the manifest reference will be pushed.
The ref is used to resolve to a locally existing image manifest.
The image manifest must exist before push. Creating a new image
manifest can be done through calculating the diff for layers,
creating the associated configuration, and creating the manifest
which references those resources.
`,
Flags: append(commands.RegistryFlags, cli.StringFlag{
Name: "manifest",
Usage: "digest of manifest",
}, cli.StringFlag{
Name: "manifest-type",
Usage: "media type of manifest digest",
Value: ocispec.MediaTypeImageManifest,
}),
Action: func(context *cli.Context) error {
var (
ref = context.Args().First()
local = context.Args().Get(1)
desc ocispec.Descriptor
)
client, ctx, cancel, err := commands.NewClient(context)
if err != nil {
return err
}
defer cancel()
if manifest := context.String("manifest"); manifest != "" {
desc.Digest, err = digest.Parse(manifest)
if err != nil {
return errors.Wrap(err, "invalid manifest digest")
}
desc.MediaType = context.String("manifest-type")
} else {
if local == "" {
local = ref
}
img, err := client.ImageService().Get(ctx, local)
if err != nil {
return errors.Wrap(err, "unable to resolve image to manifest")
}
desc = img.Target
}
resolver, err := commands.GetResolver(ctx, context)
if err != nil {
return err
}
ongoing := newPushJobs(commands.PushTracker)
eg, ctx := errgroup.WithContext(ctx)
eg.Go(func() error {
log.G(ctx).WithField("image", ref).WithField("digest", desc.Digest).Debug("pushing")
jobHandler := images.HandlerFunc(func(ctx gocontext.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
ongoing.add(remotes.MakeRefKey(ctx, desc))
return nil, nil
})
return client.Push(ctx, ref, desc,
containerd.WithResolver(resolver),
containerd.WithImageHandler(jobHandler),
)
})
errs := make(chan error)
go func() {
defer close(errs)
errs <- eg.Wait()
}()
var (
ticker = time.NewTicker(100 * time.Millisecond)
fw = progress.NewWriter(os.Stdout)
start = time.Now()
done bool
)
defer ticker.Stop()
for {
select {
case <-ticker.C:
fw.Flush()
tw := tabwriter.NewWriter(fw, 1, 8, 1, ' ', 0)
content.Display(tw, ongoing.status(), start)
tw.Flush()
if done {
fw.Flush()
return nil
}
case err := <-errs:
if err != nil {
return err
}
done = true
case <-ctx.Done():
done = true // allow ui to update once more
}
}
},
}
type pushjobs struct {
jobs map[string]struct{}
ordered []string
tracker docker.StatusTracker
mu sync.Mutex
}
func newPushJobs(tracker docker.StatusTracker) *pushjobs {
return &pushjobs{
jobs: make(map[string]struct{}),
tracker: tracker,
}
}
func (j *pushjobs) add(ref string) {
j.mu.Lock()
defer j.mu.Unlock()
if _, ok := j.jobs[ref]; ok {
return
}
j.ordered = append(j.ordered, ref)
j.jobs[ref] = struct{}{}
}
func (j *pushjobs) status() []content.StatusInfo {
j.mu.Lock()
defer j.mu.Unlock()
statuses := make([]content.StatusInfo, 0, len(j.jobs))
for _, name := range j.ordered {
si := content.StatusInfo{
Ref: name,
}
status, err := j.tracker.GetStatus(name)
if err != nil {
si.Status = "waiting"
} else {
si.Offset = status.Offset
si.Total = status.Total
si.StartedAt = status.StartedAt
si.UpdatedAt = status.UpdatedAt
if status.Offset >= status.Total {
if status.UploadUUID == "" {
si.Status = "done"
} else {
si.Status = "committing"
}
} else {
si.Status = "uploading"
}
}
statuses = append(statuses, si)
}
return statuses
}