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Fix reg cannot scan vulnerabilities on images with empty layers #168

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Fix reg cannot scan vulnerabilities on images with empty layers #168

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16 changes: 4 additions & 12 deletions clair/layerutil.go
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,7 @@ func (c *Clair) NewClairV3Layer(ctx context.Context, r *registry.Registry, image
}, nil
}

func (c *Clair) getLayers(ctx context.Context, r *registry.Registry, repo, tag string, filterEmpty bool) (map[int]distribution.Descriptor, string, error) {
func (c *Clair) getLayers(ctx context.Context, r *registry.Registry, repo, tag string) (map[int]distribution.Descriptor, string, error) {
ok := true
// Get the manifest to pass to clair.
mf, err := r.ManifestV2(ctx, repo, tag)
Expand All @@ -67,11 +67,7 @@ func (c *Clair) getLayers(ctx context.Context, r *registry.Registry, repo, tag s
// Filter out the empty layers.
if ok {
for i := 0; i < len(mf.Layers); i++ {
if filterEmpty && IsEmptyLayer(mf.Layers[i].Digest) {
continue
} else {
filteredLayers[len(mf.Layers)-i-1] = mf.Layers[i]
}
filteredLayers[len(mf.Layers)-i-1] = mf.Layers[i]
}

return filteredLayers, mf.Config.Digest.String(), nil
Expand All @@ -83,12 +79,8 @@ func (c *Clair) getLayers(ctx context.Context, r *registry.Registry, repo, tag s
}

for i := 0; i < len(m.FSLayers); i++ {
if filterEmpty && IsEmptyLayer(m.FSLayers[i].BlobSum) {
continue
} else {
filteredLayers[i] = distribution.Descriptor{
Digest: m.FSLayers[i].BlobSum,
}
filteredLayers[i] = distribution.Descriptor{
Digest: m.FSLayers[i].BlobSum,
}
}

Expand Down
28 changes: 17 additions & 11 deletions clair/vulns.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,19 +20,19 @@ func (c *Clair) Vulnerabilities(ctx context.Context, r *registry.Registry, repo,
VulnsBySeverity: make(map[string][]Vulnerability),
}

filteredLayers, _, err := c.getLayers(ctx, r, repo, tag, true)
layers, _, err := c.getLayers(ctx, r, repo, tag)
if err != nil {
return report, fmt.Errorf("getting filtered layers failed: %v", err)
return report, fmt.Errorf("getting layers failed: %v", err)
}

if len(filteredLayers) == 0 {
fmt.Printf("No need to analyse image %s:%s as there is no non-emtpy layer", repo, tag)
return report, nil
}
lastPostedLayer := ""
for i := len(layers) - 1; i >= 0; i-- {
if IsEmptyLayer(layers[i].Digest) {
continue
}

for i := len(filteredLayers) - 1; i >= 0; i-- {
// Form the clair layer.
l, err := c.NewClairLayer(ctx, r, repo, filteredLayers, i)
l, err := c.NewClairLayer(ctx, r, repo, layers, i)
if err != nil {
return report, err
}
Expand All @@ -41,11 +41,17 @@ func (c *Clair) Vulnerabilities(ctx context.Context, r *registry.Registry, repo,
if _, err := c.PostLayer(ctx, l); err != nil {
return report, err
}

lastPostedLayer = l.Name
}

report.Name = filteredLayers[0].Digest.String()
if lastPostedLayer == "" {
fmt.Printf("No need to analyse image %s:%s as there is no non-emtpy layer", repo, tag)
return report, nil
}

vl, err := c.GetLayer(ctx, filteredLayers[0].Digest.String(), true, true)
report.Name = lastPostedLayer
vl, err := c.GetLayer(ctx, lastPostedLayer, true, true)
if err != nil {
return report, err
}
Expand Down Expand Up @@ -86,7 +92,7 @@ func (c *Clair) VulnerabilitiesV3(ctx context.Context, r *registry.Registry, rep
VulnsBySeverity: make(map[string][]Vulnerability),
}

layers, reportName, err := c.getLayers(ctx, r, repo, tag, false)
layers, reportName, err := c.getLayers(ctx, r, repo, tag)
if err != nil {
return report, fmt.Errorf("getting filtered layers failed: %v", err)
}
Expand Down