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manifest.go
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manifest.go
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package main
import (
"context"
"errors"
"net/http"
"net/url"
"os"
"path"
"strings"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/quay/claircore"
"github.com/quay/zlog"
"github.com/urfave/cli/v2"
"golang.org/x/sync/errgroup"
"github.com/quay/clair/v4/internal/codec"
"github.com/quay/clair/v4/internal/httputil"
)
var ManifestCmd = &cli.Command{
Name: "manifest",
Description: "print a clair manifest for the named container",
Usage: "print a clair manifest for the named container",
Action: manifestAction,
}
func manifestAction(c *cli.Context) error {
ctx := c.Context
zlog.Debug(ctx).Msg("manifest")
args := c.Args()
if args.Len() == 0 {
return errors.New("missing needed arguments")
}
result := make(chan *claircore.Manifest)
done := make(chan struct{})
eg, ctx := errgroup.WithContext(c.Context)
go func() {
defer close(done)
enc := codec.GetEncoder(os.Stdout)
defer codec.PutEncoder(enc)
for m := range result {
enc.MustEncode(m)
}
}()
for i := 0; i < args.Len(); i++ {
name := args.Get(i)
zlog.Debug(ctx).Str("name", name).Msg("fetching")
eg.Go(func() error {
m, err := Inspect(ctx, name)
if err != nil {
zlog.Debug(ctx).
Str("name", name).
Err(err).
Send()
return err
}
zlog.Debug(ctx).
Str("name", name).
Msg("ok")
result <- m
return nil
})
}
if err := eg.Wait(); err != nil {
return err
}
close(result)
<-done
return nil
}
func Inspect(ctx context.Context, r string) (*claircore.Manifest, error) {
rt, err := rt(ctx, r)
if err != nil {
return nil, err
}
ref, err := name.ParseReference(r)
if err != nil {
return nil, err
}
desc, err := remote.Get(ref, remote.WithTransport(rt))
if err != nil {
return nil, err
}
img, err := desc.Image()
if err != nil {
return nil, err
}
dig, err := img.Digest()
if err != nil {
return nil, err
}
ccd, err := claircore.ParseDigest(dig.String())
if err != nil {
return nil, err
}
out := claircore.Manifest{Hash: ccd}
zlog.Debug(ctx).
Str("ref", r).
Stringer("digest", ccd).
Msg("found manifest")
ls, err := img.Layers()
if err != nil {
return nil, err
}
zlog.Debug(ctx).
Str("ref", r).
Int("count", len(ls)).
Msg("found layers")
repo := ref.Context()
rURL := url.URL{
Scheme: repo.Scheme(),
Host: repo.RegistryStr(),
}
c := http.Client{
Transport: rt,
}
for _, l := range ls {
d, err := l.Digest()
if err != nil {
return nil, err
}
ccd, err := claircore.ParseDigest(d.String())
if err != nil {
return nil, err
}
u, err := rURL.Parse(path.Join("/", "v2", strings.TrimPrefix(repo.RepositoryStr(), repo.RegistryStr()), "blobs", d.String()))
if err != nil {
return nil, err
}
req, err := httputil.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
if err != nil {
return nil, err
}
// The request is needed to follow any redirection chain that the server sends to a client,
// but the actual body is not needed when generating a manifest.
// The Range HTTP header allows us to send the request and get a response mostly for free.
req.Header.Add("Range", "bytes=0-0")
res, err := c.Do(req)
if err != nil {
return nil, err
}
res.Body.Close()
if res.StatusCode != http.StatusPartialContent {
zlog.Warn(ctx).
Int("statuscode", res.StatusCode).
Int("len", int(res.ContentLength)).
Str("url", u.String()).
Msg("server might not support requests with Range HTTP header")
}
res.Request.Header.Del("User-Agent")
res.Request.Header.Del("Range")
out.Layers = append(out.Layers, &claircore.Layer{
Hash: ccd,
URI: res.Request.URL.String(),
Headers: res.Request.Header,
})
}
return &out, nil
}