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content.go
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content.go
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package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"strings"
"text/tabwriter"
"time"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/log"
units "github.com/docker/go-units"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
var (
contentCommand = cli.Command{
Name: "content",
Usage: "content management",
Subcommands: cli.Commands{
listContentCommand,
ingestContentCommand,
activeIngestCommand,
getContentCommand,
editContentCommand,
deleteContentCommand,
labelContentCommand,
},
}
getContentCommand = cli.Command{
Name: "get",
Usage: "get the data for an object",
ArgsUsage: "[flags] [<digest>, ...]",
Description: "Display the image object.",
Flags: []cli.Flag{},
Action: func(context *cli.Context) error {
ctx, cancel := appContext(context)
defer cancel()
dgst, err := digest.Parse(context.Args().First())
if err != nil {
return err
}
cs, err := getContentStore(context)
if err != nil {
return err
}
ra, err := cs.ReaderAt(ctx, dgst)
if err != nil {
return err
}
defer ra.Close()
_, err = io.Copy(os.Stdout, content.NewReader(ra))
return err
},
}
ingestContentCommand = cli.Command{
Name: "ingest",
Usage: "accept content into the store",
ArgsUsage: "[flags] <key>",
Description: `Ingest objects into the local content store.`,
Flags: []cli.Flag{
cli.Int64Flag{
Name: "expected-size",
Usage: "validate against provided size",
},
cli.StringFlag{
Name: "expected-digest",
Usage: "verify content against expected digest",
},
},
Action: func(context *cli.Context) error {
var (
ref = context.Args().First()
expectedSize = context.Int64("expected-size")
expectedDigest = digest.Digest(context.String("expected-digest"))
)
ctx, cancel := appContext(context)
defer cancel()
if err := expectedDigest.Validate(); expectedDigest != "" && err != nil {
return err
}
if ref == "" {
return errors.New("must specify a transaction reference")
}
cs, err := getContentStore(context)
if err != nil {
return err
}
// TODO(stevvooe): Allow ingest to be reentrant. Currently, we expect
// all data to be written in a single invocation. Allow multiple writes
// to the same transaction key followed by a commit.
return content.WriteBlob(ctx, cs, ref, os.Stdin, expectedSize, expectedDigest)
},
}
activeIngestCommand = cli.Command{
Name: "active",
Usage: "display active transfers.",
ArgsUsage: "[flags] [<regexp>]",
Description: `Display the ongoing transfers.`,
Flags: []cli.Flag{
cli.DurationFlag{
Name: "timeout, t",
Usage: "total timeout for fetch",
EnvVar: "CONTAINERD_FETCH_TIMEOUT",
},
cli.StringFlag{
Name: "root",
Usage: "path to content store root",
Value: "/tmp/content", // TODO(stevvooe): for now, just use the PWD/.content
},
},
Action: func(context *cli.Context) error {
var (
match = context.Args().First()
)
ctx, cancel := appContext(context)
defer cancel()
cs, err := getContentStore(context)
if err != nil {
return err
}
active, err := cs.ListStatuses(ctx, match)
if err != nil {
return err
}
tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
fmt.Fprintln(tw, "REF\tSIZE\tAGE\t")
for _, active := range active {
fmt.Fprintf(tw, "%s\t%s\t%s\t\n",
active.Ref,
units.HumanSize(float64(active.Offset)),
units.HumanDuration(time.Since(active.StartedAt)))
}
return tw.Flush()
},
}
listContentCommand = cli.Command{
Name: "list",
Aliases: []string{"ls"},
Usage: "list all blobs in the store.",
ArgsUsage: "[flags] [<filter>, ...]",
Description: `List blobs in the content store.`,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "quiet, q",
Usage: "print only the blob digest",
},
},
Action: func(context *cli.Context) error {
var (
quiet = context.Bool("quiet")
args = []string(context.Args())
)
ctx, cancel := appContext(context)
defer cancel()
cs, err := getContentStore(context)
if err != nil {
return err
}
var walkFn content.WalkFunc
if quiet {
walkFn = func(info content.Info) error {
fmt.Println(info.Digest)
return nil
}
} else {
tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
defer tw.Flush()
fmt.Fprintln(tw, "DIGEST\tSIZE\tAGE\tLABELS")
walkFn = func(info content.Info) error {
var labelStrings []string
for k, v := range info.Labels {
labelStrings = append(labelStrings, strings.Join([]string{k, v}, "="))
}
labels := strings.Join(labelStrings, ",")
if labels == "" {
labels = "-"
}
fmt.Fprintf(tw, "%s\t%s\t%s\t%s\n",
info.Digest,
units.HumanSize(float64(info.Size)),
units.HumanDuration(time.Since(info.CreatedAt)),
labels)
return nil
}
}
return cs.Walk(ctx, walkFn, args...)
},
}
labelContentCommand = cli.Command{
Name: "label",
Usage: "adds labels to content",
ArgsUsage: "[flags] <digest> [<label>=<value> ...]",
Description: `Labels blobs in the content store`,
Flags: []cli.Flag{},
Action: func(context *cli.Context) error {
var (
object, labels = objectWithLabelArgs(context)
)
ctx, cancel := appContext(context)
defer cancel()
cs, err := getContentStore(context)
if err != nil {
return err
}
dgst, err := digest.Parse(object)
if err != nil {
return err
}
info := content.Info{
Digest: dgst,
Labels: map[string]string{},
}
var paths []string
for k, v := range labels {
paths = append(paths, fmt.Sprintf("labels.%s", k))
if v != "" {
info.Labels[k] = v
}
}
// Nothing updated, do no clear
if len(paths) == 0 {
info, err = cs.Info(ctx, info.Digest)
} else {
info, err = cs.Update(ctx, info, paths...)
}
if err != nil {
return err
}
var labelStrings []string
for k, v := range info.Labels {
labelStrings = append(labelStrings, fmt.Sprintf("%s=%s", k, v))
}
fmt.Println(strings.Join(labelStrings, ","))
return nil
},
}
editContentCommand = cli.Command{
Name: "edit",
Usage: "edit a blob and return a new digest.",
ArgsUsage: "[flags] <digest>",
Description: `Edit a blob and return a new digest.`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "validate",
Usage: "validate the result against a format (json, mediatype, etc.)",
},
},
Action: func(context *cli.Context) error {
var (
validate = context.String("validate")
object = context.Args().First()
)
ctx, cancel := appContext(context)
defer cancel()
if validate != "" {
return errors.New("validating the edit result not supported")
}
// TODO(stevvooe): Support looking up objects by a reference through
// the image metadata storage.
dgst, err := digest.Parse(object)
if err != nil {
return err
}
cs, err := getContentStore(context)
if err != nil {
return err
}
ra, err := cs.ReaderAt(ctx, dgst)
if err != nil {
return err
}
defer ra.Close()
nrc, err := edit(content.NewReader(ra))
if err != nil {
return err
}
defer nrc.Close()
wr, err := cs.Writer(ctx, "edit-"+object, 0, "") // TODO(stevvooe): Choose a better key?
if err != nil {
return err
}
if _, err := io.Copy(wr, nrc); err != nil {
return err
}
if err := wr.Commit(0, wr.Digest()); err != nil {
return err
}
fmt.Println(wr.Digest())
return nil
},
}
deleteContentCommand = cli.Command{
Name: "delete",
Aliases: []string{"del", "remove", "rm"},
Usage: "permanently delete one or more blobs.",
ArgsUsage: "[flags] [<digest>, ...]",
Description: `Delete one or more blobs permanently. Successfully deleted
blobs are printed to stdout.`,
Flags: []cli.Flag{},
Action: func(context *cli.Context) error {
var (
args = []string(context.Args())
exitError error
)
ctx, cancel := appContext(context)
defer cancel()
cs, err := getContentStore(context)
if err != nil {
return err
}
for _, arg := range args {
dgst, err := digest.Parse(arg)
if err != nil {
if exitError == nil {
exitError = err
}
log.G(ctx).WithError(err).Errorf("could not delete %v", dgst)
continue
}
if err := cs.Delete(ctx, dgst); err != nil {
if !errdefs.IsNotFound(err) {
if exitError == nil {
exitError = err
}
log.G(ctx).WithError(err).Errorf("could not delete %v", dgst)
}
continue
}
fmt.Println(dgst)
}
return exitError
},
}
)
func edit(rd io.Reader) (io.ReadCloser, error) {
tmp, err := ioutil.TempFile("", "edit-")
if err != nil {
return nil, err
}
if _, err := io.Copy(tmp, rd); err != nil {
tmp.Close()
return nil, err
}
cmd := exec.Command("sh", "-c", "$EDITOR "+tmp.Name())
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = os.Environ()
if err := cmd.Run(); err != nil {
tmp.Close()
return nil, err
}
if _, err := tmp.Seek(0, io.SeekStart); err != nil {
tmp.Close()
return nil, err
}
return onCloser{ReadCloser: tmp, onClose: func() error {
return os.RemoveAll(tmp.Name())
}}, nil
}
type onCloser struct {
io.ReadCloser
onClose func() error
}
func (oc onCloser) Close() error {
var err error
if err1 := oc.ReadCloser.Close(); err1 != nil {
err = err1
}
if oc.onClose != nil {
err1 := oc.onClose()
if err == nil {
err = err1
}
}
return err
}