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create.go
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create.go
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package commands
import (
"context"
"encoding/json"
"fmt"
"os"
"strings"
"github.com/docker/buildx/store"
"github.com/docker/buildx/store/storeutil"
"github.com/docker/buildx/util/imagetools"
"github.com/docker/buildx/util/progress"
"github.com/docker/cli/cli/command"
"github.com/docker/distribution/reference"
"github.com/moby/buildkit/util/appcontext"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"golang.org/x/sync/errgroup"
)
type createOptions struct {
builder string
files []string
tags []string
dryrun bool
actionAppend bool
progress string
}
func runCreate(dockerCli command.Cli, in createOptions, args []string) error {
if len(args) == 0 && len(in.files) == 0 {
return errors.Errorf("no sources specified")
}
if !in.dryrun && len(in.tags) == 0 {
return errors.Errorf("can't push with no tags specified, please set --tag or --dry-run")
}
fileArgs := make([]string, len(in.files))
for i, f := range in.files {
dt, err := os.ReadFile(f)
if err != nil {
return err
}
fileArgs[i] = string(dt)
}
args = append(fileArgs, args...)
tags, err := parseRefs(in.tags)
if err != nil {
return err
}
if in.actionAppend && len(in.tags) > 0 {
args = append([]string{in.tags[0]}, args...)
}
srcs, err := parseSources(args)
if err != nil {
return err
}
repos := map[string]struct{}{}
for _, t := range tags {
repos[t.Name()] = struct{}{}
}
sourceRefs := false
for _, s := range srcs {
if s.Ref != nil {
repos[s.Ref.Name()] = struct{}{}
sourceRefs = true
}
}
if len(repos) == 0 {
return errors.Errorf("no repositories specified, please set a reference in tag or source")
}
var defaultRepo *string
if len(repos) == 1 {
for repo := range repos {
defaultRepo = &repo
}
}
for i, s := range srcs {
if s.Ref == nil && s.Desc.MediaType == "" && s.Desc.Digest != "" {
if defaultRepo == nil {
return errors.Errorf("multiple repositories specified, cannot infer repository for %q", args[i])
}
n, err := reference.ParseNormalizedNamed(*defaultRepo)
if err != nil {
return err
}
r, err := reference.WithDigest(n, s.Desc.Digest)
if err != nil {
return err
}
srcs[i].Ref = r
sourceRefs = true
}
}
ctx := appcontext.Context()
txn, release, err := storeutil.GetStore(dockerCli)
if err != nil {
return err
}
defer release()
var ng *store.NodeGroup
if in.builder != "" {
ng, err = storeutil.GetNodeGroup(txn, dockerCli, in.builder)
if err != nil {
return err
}
} else {
ng, err = storeutil.GetCurrentInstance(txn, dockerCli)
if err != nil {
return err
}
}
imageopt, err := storeutil.GetImageConfig(dockerCli, ng)
if err != nil {
return err
}
r := imagetools.New(imageopt)
if sourceRefs {
eg, ctx2 := errgroup.WithContext(ctx)
for i, s := range srcs {
if s.Ref == nil {
continue
}
func(i int) {
eg.Go(func() error {
_, desc, err := r.Resolve(ctx2, srcs[i].Ref.String())
if err != nil {
return err
}
if srcs[i].Desc.Digest == "" {
srcs[i].Desc = desc
} else {
var err error
srcs[i].Desc, err = mergeDesc(desc, srcs[i].Desc)
if err != nil {
return err
}
}
return nil
})
}(i)
}
if err := eg.Wait(); err != nil {
return err
}
}
dt, desc, err := r.Combine(ctx, srcs)
if err != nil {
return err
}
if in.dryrun {
fmt.Printf("%s\n", dt)
return nil
}
// new resolver cause need new auth
r = imagetools.New(imageopt)
ctx2, cancel := context.WithCancel(context.TODO())
defer cancel()
printer := progress.NewPrinter(ctx2, os.Stderr, os.Stderr, in.progress)
eg, _ := errgroup.WithContext(ctx)
pw := progress.WithPrefix(printer, "internal", true)
for _, t := range tags {
t := t
eg.Go(func() error {
return progress.Wrap(fmt.Sprintf("pushing %s", t.String()), pw.Write, func(sub progress.SubLogger) error {
eg2, _ := errgroup.WithContext(ctx)
for _, s := range srcs {
if reference.Domain(s.Ref) == reference.Domain(t) && reference.Path(s.Ref) == reference.Path(t) {
continue
}
s := s
eg2.Go(func() error {
sub.Log(1, []byte(fmt.Sprintf("copying %s from %s to %s\n", s.Desc.Digest.String(), s.Ref.String(), t.String())))
return r.Copy(ctx, s, t)
})
}
if err := eg2.Wait(); err != nil {
return err
}
sub.Log(1, []byte(fmt.Sprintf("pushing %s to %s\n", desc.Digest.String(), t.String())))
return r.Push(ctx, t, desc, dt)
})
})
}
err = eg.Wait()
err1 := printer.Wait()
if err == nil {
err = err1
}
return err
}
func parseSources(in []string) ([]*imagetools.Source, error) {
out := make([]*imagetools.Source, len(in))
for i, in := range in {
s, err := parseSource(in)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse source %q, valid sources are digests, references and descriptors", in)
}
out[i] = s
}
return out, nil
}
func parseRefs(in []string) ([]reference.Named, error) {
refs := make([]reference.Named, len(in))
for i, in := range in {
n, err := reference.ParseNormalizedNamed(in)
if err != nil {
return nil, err
}
refs[i] = n
}
return refs, nil
}
func parseSource(in string) (*imagetools.Source, error) {
// source can be a digest, reference or a descriptor JSON
dgst, err := digest.Parse(in)
if err == nil {
return &imagetools.Source{
Desc: ocispec.Descriptor{
Digest: dgst,
},
}, nil
} else if strings.HasPrefix(in, "sha256") {
return nil, err
}
ref, err := reference.ParseNormalizedNamed(in)
if err == nil {
return &imagetools.Source{
Ref: ref,
}, nil
} else if !strings.HasPrefix(in, "{") {
return nil, err
}
var s imagetools.Source
if err := json.Unmarshal([]byte(in), &s.Desc); err != nil {
return nil, errors.WithStack(err)
}
return &s, nil
}
func createCmd(dockerCli command.Cli, opts RootOptions) *cobra.Command {
var options createOptions
cmd := &cobra.Command{
Use: "create [OPTIONS] [SOURCE] [SOURCE...]",
Short: "Create a new image based on source images",
RunE: func(cmd *cobra.Command, args []string) error {
options.builder = *opts.Builder
return runCreate(dockerCli, options, args)
},
}
flags := cmd.Flags()
flags.StringArrayVarP(&options.files, "file", "f", []string{}, "Read source descriptor from file")
flags.StringArrayVarP(&options.tags, "tag", "t", []string{}, "Set reference for new image")
flags.BoolVar(&options.dryrun, "dry-run", false, "Show final image instead of pushing")
flags.BoolVar(&options.actionAppend, "append", false, "Append to existing manifest")
flags.StringVar(&options.progress, "progress", "auto", `Set type of progress output ("auto", "plain", "tty"). Use plain to show container output`)
return cmd
}
func mergeDesc(d1, d2 ocispec.Descriptor) (ocispec.Descriptor, error) {
if d2.Size != 0 && d1.Size != d2.Size {
return ocispec.Descriptor{}, errors.Errorf("invalid size mismatch for %s, %d != %d", d1.Digest, d2.Size, d1.Size)
}
if d2.MediaType != "" {
d1.MediaType = d2.MediaType
}
if len(d2.Annotations) != 0 {
d1.Annotations = d2.Annotations // no merge so support removes
}
if d2.Platform != nil {
d1.Platform = d2.Platform // missing items filled in later from image config
}
return d1, nil
}