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resources.go
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resources.go
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package kube
import (
"fmt"
"hash"
"hash/fnv"
"github.com/aquasecurity/starboard/pkg/starboard"
"github.com/davecgh/go-spew/spew"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/rand"
)
// GetContainerImagesFromPodSpec returns a map of container names
// to container images from the specified v1.PodSpec.
func GetContainerImagesFromPodSpec(spec corev1.PodSpec) ContainerImages {
images := ContainerImages{}
for _, container := range spec.Containers {
images[container.Name] = container.Image
}
return images
}
// GetContainerImagesFromJob returns a map of container names
// to container images from the specified v1.Job.
// The mapping is encoded as JSON value of the AnnotationContainerImages
// annotation.
func GetContainerImagesFromJob(job *batchv1.Job) (ContainerImages, error) {
var containerImagesAsJSON string
var ok bool
if containerImagesAsJSON, ok = job.Annotations[starboard.AnnotationContainerImages]; !ok {
return nil, fmt.Errorf("required annotation not set: %s", starboard.AnnotationContainerImages)
}
containerImages := ContainerImages{}
err := containerImages.FromJSON(containerImagesAsJSON)
if err != nil {
return nil, fmt.Errorf("parsing annotation: %s: %w", starboard.AnnotationContainerImages, err)
}
return containerImages, nil
}
// ComputeHash returns a hash value calculated from a given object.
// The hash will be safe encoded to avoid bad words.
func ComputeHash(obj interface{}) string {
podSpecHasher := fnv.New32a()
DeepHashObject(podSpecHasher, obj)
return rand.SafeEncodeString(fmt.Sprint(podSpecHasher.Sum32()))
}
// DeepHashObject writes specified object to hash using the spew library
// which follows pointers and prints actual values of the nested objects
// ensuring the hash does not change when a pointer changes.
func DeepHashObject(hasher hash.Hash, objectToWrite interface{}) {
hasher.Reset()
printer := spew.ConfigState{
Indent: " ",
SortKeys: true,
DisableMethods: true,
SpewKeys: true,
}
printer.Fprintf(hasher, "%#v", objectToWrite)
}