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inspector.go
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/
inspector.go
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package main
import (
"context"
"net/http"
"net/url"
"path"
"strings"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
"github.com/quay/claircore"
)
// Inspect calls external commands to inspect the specified image.
//
// The command (skopeo or docker) needs to be configured with any needed
// permissions.
func Inspect(ctx context.Context, r string) (*claircore.Manifest, error) {
ref, err := name.ParseReference(r)
if err != nil {
return nil, err
}
repo := ref.Context()
auth, err := authn.DefaultKeychain.Resolve(repo)
if err != nil {
return nil, err
}
rt, err := transport.New(repo.Registry, auth, http.DefaultTransport, []string{repo.Scope("pull")})
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
}
h, err := img.Digest()
if err != nil {
return nil, err
}
ccd, err := claircore.ParseDigest(h.String())
if err != nil {
return nil, err
}
out := claircore.Manifest{
Hash: ccd,
}
ls, err := img.Layers()
if err != nil {
return nil, err
}
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 := http.NewRequestWithContext(ctx, http.MethodHead, u.String(), nil)
if err != nil {
return nil, err
}
res, err := c.Do(req)
if err != nil {
return nil, err
}
res.Body.Close()
res.Request.Header.Del("User-Agent")
out.Layers = append(out.Layers, &claircore.Layer{
Hash: ccd,
URI: res.Request.URL.String(),
Headers: res.Request.Header,
})
}
return &out, nil
}