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libpod/image: Use ParseNormalizedNamed in RepoDigests #2106

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libpod/image: Use ParseNormalizedNamed in RepoDigests #2106

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5 changes: 4 additions & 1 deletion cmd/podman/sign.go
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Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,10 @@ func signCmd(c *cli.Context) error {
sigStoreDir = SignatureStoreDir
}

repos := newImage.RepoDigests()
repos, err := newImage.RepoDigests()
if err != nil {
return errors.Wrapf(err, "error calculating repo digests for %s", signimage)
}
if len(repos) == 0 {
logrus.Errorf("no repodigests associated with the image %s", signimage)
continue
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18 changes: 15 additions & 3 deletions libpod/image/image.go
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Original file line number Diff line number Diff line change
Expand Up @@ -305,12 +305,24 @@ func (i *Image) Names() []string {
}

// RepoDigests returns a string array of repodigests associated with the image
func (i *Image) RepoDigests() []string {
func (i *Image) RepoDigests() ([]string, error) {
var repoDigests []string
digest := i.Digest()

for _, name := range i.Names() {
repoDigests = append(repoDigests, strings.SplitN(name, ":", 2)[0]+"@"+i.Digest().String())
named, err := reference.ParseNormalizedNamed(name)
if err != nil {
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FWIW c/image/storage silently ignores errors (= .Names entries not in the c/image/docker/reference format).

Names are not documented to be in any particular format, so hard failures here may not be appropriate — OTOH maybe we should tighten the definition of Names instead. I don’t know.

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Names are not documented to be in any particular format, so hard failures here may not be appropriate...

I don't have an opinion on what ParseNormaliedNamed wants to consider an error, but if it returns an error, I think we should be passing it back up the chain. I certainly don't want different opinions on what names are considered valid living at different places in the stack.

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I’m saying that the existing opinion/practice is that non-ParseNormalizedNamed names are 1) allowed and 2) silently ignored, so if you ”don’t want different opinions” (which I agree with) the right thing to do is to silently ignore such names as well.

I do support tightening the definition, but if that should happen, it needs be a separate PR set across c/storage (documenting the field as such)+c/image+libpod (using it) and maybe others.

return nil, err
}

canonical, err := reference.WithDigest(reference.TrimNamed(named), digest)
if err != nil {
return nil, err
}

repoDigests = append(repoDigests, canonical.String())
}
return repoDigests
return repoDigests, nil
}

// Created returns the time the image was created
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46 changes: 46 additions & 0 deletions libpod/image/image_test.go
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Expand Up @@ -9,6 +9,7 @@ import (
"testing"

"github.com/containers/storage"
"github.com/opencontainers/go-digest"
"github.com/stretchr/testify/assert"
)

Expand Down Expand Up @@ -192,6 +193,51 @@ func TestImage_MatchRepoTag(t *testing.T) {
cleanup(workdir, ir)
}

// TestImage_RepoDigests tests RepoDigest generation.
func TestImage_RepoDigests(t *testing.T) {
dgst, err := digest.Parse("sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc")
if err != nil {
t.Fatal(err)
}

for _, test := range []struct {
name string
names []string
expected []string
}{
{
name: "empty",
names: []string{},
expected: nil,
},
{
name: "tagged",
names: []string{"docker.io/library/busybox:latest"},
expected: []string{"docker.io/library/busybox@sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc"},
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How often does Busybox update (such that this would no longer pull the same image)?

Can we throw a comment on here that this needs updating when busybox bumps its image version?

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How often does Busybox update...

This digest is hard-coded in the test itself; it is completely decoupled from any real-world BusyBox image. So no need to bump anything.

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Oh, sorry, I meant the line above - busybox:latest

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Oh, sorry, I meant the line above - busybox:latest

Still just a string I'm hard-coding for these unit tests with no relation to real-world images. The new unit tests should just be exercising vendored string-manipulation code; they aren't hitting the network or anything.

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Alright, should be fine then, thanks

},
{
name: "digest",
names: []string{"docker.io/library/busybox@sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc"},
expected: []string{"docker.io/library/busybox@sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc"},
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This test fails with the doubled @sha256 unless we also include the ParseNormalizedNamed change this commit makes to RepoDigests().

},
} {
t.Run(test.name, func(t *testing.T) {
image := &Image{
image: &storage.Image{
Names: test.names,
Digest: dgst,
},
}
actual, err := image.RepoDigests()
if err != nil {
t.Fatal(err)
}

assert.Equal(t, test.expected, actual)
})
}
}

// Test_splitString tests the splitString function in image that
// takes input and splits on / and returns the last array item
func Test_splitString(t *testing.T) {
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13 changes: 11 additions & 2 deletions pkg/varlinkapi/images.go
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Expand Up @@ -41,13 +41,18 @@ func (i *LibpodAPI) ListImages(call iopodman.VarlinkCall) error {
for _, image := range images {
labels, _ := image.Labels(getContext())
containers, _ := image.Containers()
repoDigests, err := image.RepoDigests()
if err != nil {
return err
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I dunno why everyone else is ignoring errors here, but it's been that way since 39a7a77 (#669). @baude, do you remember your motivation?

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image.Labels(...) seems to ignore errors as well.

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image.Labels(...) seems to ignore errors as well.

Yeah, I left the existing error-ignores alone, since I don't understand their motivation. I'm happy to make these all consistent though (one way or the other) if someone can explain the motivation.

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It looks like we don't want to fatally fail when trying to get some information on an image, but it's not commented at all so I'm not sure. @baude this intentional?

}

size, _ := image.Size(getContext())

i := iopodman.ImageInList{
Id: image.ID(),
ParentId: image.Parent,
RepoTags: image.Names(),
RepoDigests: image.RepoDigests(),
RepoDigests: repoDigests,
Created: image.Created().String(),
Size: int64(*size),
VirtualSize: image.VirtualSize,
Expand All @@ -73,6 +78,10 @@ func (i *LibpodAPI) GetImage(call iopodman.VarlinkCall, name string) error {
if err != nil {
return err
}
repoDigests, err := newImage.RepoDigests()
if err != nil {
return err
}
size, err := newImage.Size(getContext())
if err != nil {
return err
Expand All @@ -82,7 +91,7 @@ func (i *LibpodAPI) GetImage(call iopodman.VarlinkCall, name string) error {
Id: newImage.ID(),
ParentId: newImage.Parent,
RepoTags: newImage.Names(),
RepoDigests: newImage.RepoDigests(),
RepoDigests: repoDigests,
Created: newImage.Created().String(),
Size: int64(*size),
VirtualSize: newImage.VirtualSize,
Expand Down