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Fix a bug in Deployment controller when comparing templates

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This commit is contained in:
Janet Kuo 2018-04-04 17:14:07 -07:00
parent 76920d88b2
commit 19b4fee95c
2 changed files with 19 additions and 16 deletions
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23
pkg/controller/deployment/util/deployment_util.go
View File

@ -632,25 +632,16 @@ func ListPods(deployment *extensions.Deployment, rsList []*extensions.ReplicaSet
}
// EqualIgnoreHash returns true if two given podTemplateSpec are equal, ignoring the diff in value of Labels[pod-template-hash]
// We ignore pod-template-hash because the hash result would be different upon podTemplateSpec API changes
// (e.g. the addition of a new field will cause the hash code to change)
// Note that we assume input podTemplateSpecs contain non-empty labels
// We ignore pod-template-hash because:
// 1. The hash result would be different upon podTemplateSpec API changes
// (e.g. the addition of a new field will cause the hash code to change)
// 2. The deployment template won't have hash labels
func EqualIgnoreHash(template1, template2 *v1.PodTemplateSpec) bool {
t1Copy := template1.DeepCopy()
t2Copy := template2.DeepCopy()
// First, compare template.Labels (ignoring hash)
labels1, labels2 := t1Copy.Labels, t2Copy.Labels
if len(labels1) > len(labels2) {
labels1, labels2 = labels2, labels1
}
// We make sure len(labels2) >= len(labels1)
for k, v := range labels2 {
if labels1[k] != v && k != extensions.DefaultDeploymentUniqueLabelKey {
return false
}
}
// Then, compare the templates without comparing their labels
t1Copy.Labels, t2Copy.Labels = nil, nil
// Remove hash labels from template.Labels before comparing
delete(t1Copy.Labels, extensions.DefaultDeploymentUniqueLabelKey)
delete(t2Copy.Labels, extensions.DefaultDeploymentUniqueLabelKey)
return apiequality.Semantic.DeepEqual(t1Copy, t2Copy)
}

12
pkg/controller/deployment/util/deployment_util_test.go
View File

@ -356,6 +356,18 @@ func TestEqualIgnoreHash(t *testing.T) {
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{extensions.DefaultDeploymentUniqueLabelKey: "value-2", "something": "else"}),
true,
},
{
"Same spec, the label is different, the former doesn't have pod-template-hash label, same number of labels",
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{"something": "else"}),
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{extensions.DefaultDeploymentUniqueLabelKey: "value-2"}),
false,
},
{
"Same spec, the label is different, the latter doesn't have pod-template-hash label, same number of labels",
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{extensions.DefaultDeploymentUniqueLabelKey: "value-1"}),
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{"something": "else"}),
false,
},
{
"Same spec, the label is different, and the pod-template-hash label value is the same",
generatePodTemplateSpec("foo", "foo-node", map[string]string{}, map[string]string{extensions.DefaultDeploymentUniqueLabelKey: "value-1"}),