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Add AnyVolumeDataSource feature gate

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Allow any custom resource to be the data source of a PVC, if the
AnyVolumeDataSource feature gate is enabled. This is an alpha feature.
This commit is contained in:
Ben Swartzlander 2020-03-04 17:25:48 -05:00
parent e865c0b219
commit e8b09d3644
11 changed files with 155 additions and 36 deletions
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2
api/openapi-spec/swagger.json generated
View File

@ -7832,7 +7832,7 @@
},
"dataSource": {
"$ref": "#/definitions/io.k8s.api.core.v1.TypedLocalObjectReference",
"description": "This field can be used to specify either: * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta) * An existing PVC (PersistentVolumeClaim) In order to use VolumeSnapshot object types, the appropriate feature gate must be enabled (VolumeSnapshotDataSource) If the provisioner can support the specified data source, it will create a new volume based on the contents of the specified PVC or Snapshot. If the provisioner does not support the specified data source, the volume will not be created and the failure will be reported as an event. In the future, we plan to support more data source types and the behavior of the provisioner may change."
"description": "This field can be used to specify either: * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta) * An existing PVC (PersistentVolumeClaim) * An existing custom resource/object that implements data population (Alpha) In order to use VolumeSnapshot object types, the appropriate feature gate must be enabled (VolumeSnapshotDataSource or AnyVolumeDataSource) If the provisioner or an external controller can support the specified data source, it will create a new volume based on the contents of the specified data source. If the specified data source is not supported, the volume will not be created and the failure will be reported as an event. In the future, we plan to support more data source types and the behavior of the provisioner may change."
},
"resources": {
"$ref": "#/definitions/io.k8s.api.core.v1.ResourceRequirements",

4
pkg/api/persistentvolumeclaim/util.go
View File

@ -47,6 +47,10 @@ func dataSourceInUse(oldPVCSpec *core.PersistentVolumeClaimSpec) bool {
func dataSourceIsEnabled(pvcSpec *core.PersistentVolumeClaimSpec) bool {
if pvcSpec.DataSource != nil {
if utilfeature.DefaultFeatureGate.Enabled(features.AnyVolumeDataSource) {
return true
}
apiGroup := ""
if pvcSpec.DataSource.APIGroup != nil {
apiGroup = *pvcSpec.DataSource.APIGroup

111
pkg/api/persistentvolumeclaim/util_test.go
View File

@ -71,6 +71,9 @@ func TestDropDisabledSnapshotDataSource(t *testing.T) {
},
}
// Ensure that any data sources aren't enabled for this test
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AnyVolumeDataSource, false)()
for _, enabled := range []bool{true, false} {
for _, oldpvcInfo := range pvcInfo {
for _, newpvcInfo := range pvcInfo {
@ -169,6 +172,9 @@ func TestPVCDataSourceSpecFilter(t *testing.T) {
},
}
// Ensure that any data sources aren't enabled for this test
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AnyVolumeDataSource, false)()
for testName, test := range tests {
t.Run(testName, func(t *testing.T) {
DropDisabledFields(&test.spec, nil)
@ -181,3 +187,108 @@ func TestPVCDataSourceSpecFilter(t *testing.T) {
}
}
// TestAnyDataSourceFilter checks to ensure the AnyVolumeDataSource feature gate works
func TestAnyDataSourceFilter(t *testing.T) {
makeDataSource := func(apiGroup, kind, name string) *core.TypedLocalObjectReference {
return &core.TypedLocalObjectReference{
APIGroup: &apiGroup,
Kind: kind,
Name: name,
}
}
volumeDataSource := makeDataSource("", "PersistentVolumeClaim", "my-vol")
snapshotDataSource := makeDataSource("snapshot.storage.k8s.io", "VolumeSnapshot", "my-snap")
genericDataSource := makeDataSource("generic.storage.k8s.io", "Generic", "my-foo")
var tests = map[string]struct {
spec core.PersistentVolumeClaimSpec
snapshotEnabled bool
anyEnabled bool
want *core.TypedLocalObjectReference
}{
"both disabled with empty ds": {
spec: core.PersistentVolumeClaimSpec{},
want: nil,
},
"both disabled with volume ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: volumeDataSource},
want: volumeDataSource,
},
"both disabled with snapshot ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: snapshotDataSource},
want: nil,
},
"both disabled with generic ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: genericDataSource},
want: nil,
},
"any enabled with empty ds": {
spec: core.PersistentVolumeClaimSpec{},
anyEnabled: true,
want: nil,
},
"any enabled with volume ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: volumeDataSource},
anyEnabled: true,
want: volumeDataSource,
},
"any enabled with snapshot ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: snapshotDataSource},
anyEnabled: true,
want: snapshotDataSource,
},
"any enabled with generic ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: genericDataSource},
anyEnabled: true,
want: genericDataSource,
},
"snapshot enabled with snapshot ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: snapshotDataSource},
snapshotEnabled: true,
want: snapshotDataSource,
},
"snapshot enabled with generic ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: genericDataSource},
snapshotEnabled: true,
want: nil,
},
"both enabled with empty ds": {
spec: core.PersistentVolumeClaimSpec{},
snapshotEnabled: true,
anyEnabled: true,
want: nil,
},
"both enabled with volume ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: volumeDataSource},
snapshotEnabled: true,
anyEnabled: true,
want: volumeDataSource,
},
"both enabled with snapshot ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: snapshotDataSource},
snapshotEnabled: true,
anyEnabled: true,
want: snapshotDataSource,
},
"both enabled with generic ds": {
spec: core.PersistentVolumeClaimSpec{DataSource: genericDataSource},
snapshotEnabled: true,
anyEnabled: true,
want: genericDataSource,
},
}
for testName, test := range tests {
t.Run(testName, func(t *testing.T) {
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSnapshotDataSource, test.snapshotEnabled)()
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AnyVolumeDataSource, test.anyEnabled)()
DropDisabledFields(&test.spec, nil)
if test.spec.DataSource != test.want {
t.Errorf("expected condition was not met, test: %s, snapshotEnabled: %v, anyEnabled: %v, spec: %v, expected: %v",
testName, test.snapshotEnabled, test.anyEnabled, test.spec, test.want)
}
})
}
}

9
pkg/apis/core/types.go
View File

@ -420,11 +420,12 @@ type PersistentVolumeClaimSpec struct {
// This field can be used to specify either:
// * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta)
// * An existing PVC (PersistentVolumeClaim)
// * An existing custom resource/object that implements data population (Alpha)
// In order to use VolumeSnapshot object types, the appropriate feature gate
// must be enabled (VolumeSnapshotDataSource)
// If the provisioner can support the specified data source, it will create
// a new volume based on the contents of the specified PVC or Snapshot.
// If the provisioner does not support the specified data source, the volume will
// must be enabled (VolumeSnapshotDataSource or AnyVolumeDataSource)
// If the provisioner or an external controller can support the specified data source,
// it will create a new volume based on the contents of the specified data source.
// If the specified data source is not supported, the volume will
// not be created and the failure will be reported as an event.
// In the future, we plan to support more data source types and the behavior
// of the provisioner may change.

1
pkg/apis/core/validation/BUILD
View File

@ -33,7 +33,6 @@ go_library(
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/validation:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/diff:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/intstr:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",

22
pkg/apis/core/validation/validation.go
View File

@ -38,7 +38,6 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
unversionedvalidation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/diff"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/sets"
@ -1563,11 +1562,6 @@ var supportedReclaimPolicy = sets.NewString(string(core.PersistentVolumeReclaimD
var supportedVolumeModes = sets.NewString(string(core.PersistentVolumeBlock), string(core.PersistentVolumeFilesystem))
var supportedDataSourceAPIGroupKinds = map[schema.GroupKind]bool{
{Group: "snapshot.storage.k8s.io", Kind: "VolumeSnapshot"}: true,
{Group: "", Kind: "PersistentVolumeClaim"}: true,
}
func ValidatePersistentVolumeSpec(pvSpec *core.PersistentVolumeSpec, pvName string, validateInlinePersistentVolumeSpec bool, fldPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
@ -1929,17 +1923,15 @@ func ValidatePersistentVolumeClaimSpec(spec *core.PersistentVolumeClaimSpec, fld
if len(spec.DataSource.Name) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("dataSource", "name"), ""))
}
groupKind := schema.GroupKind{Group: "", Kind: spec.DataSource.Kind}
if len(spec.DataSource.Kind) == 0 {
allErrs = append(allErrs, field.Required(fldPath.Child("dataSource", "kind"), ""))
}
apiGroup := ""
if spec.DataSource.APIGroup != nil {
groupKind.Group = string(*spec.DataSource.APIGroup)
apiGroup = *spec.DataSource.APIGroup
}
groupKindList := make([]string, 0, len(supportedDataSourceAPIGroupKinds))
for grp := range supportedDataSourceAPIGroupKinds {
groupKindList = append(groupKindList, grp.String())
}
if !supportedDataSourceAPIGroupKinds[groupKind] {
allErrs = append(allErrs, field.NotSupported(fldPath.Child("dataSource"), groupKind.String(), groupKindList))
if len(apiGroup) == 0 && spec.DataSource.Kind != "PersistentVolumeClaim" {
allErrs = append(allErrs, field.Invalid(fldPath.Child("dataSource"), spec.DataSource.Kind, ""))
}
}

15
pkg/apis/core/validation/validation_test.go
View File

@ -904,8 +904,7 @@ func TestAlphaVolumeSnapshotDataSource(t *testing.T) {
}
failedTestCases := []core.PersistentVolumeClaimSpec{
*testVolumeSnapshotDataSourceInSpec("", "VolumeSnapshot", "snapshot.storage.k8s.io"),
*testVolumeSnapshotDataSourceInSpec("test_snapshot", "PersistentVolumeClaim", "snapshot.storage.k8s.io"),
*testVolumeSnapshotDataSourceInSpec("test_snapshot", "VolumeSnapshot", "storage.k8s.io"),
*testVolumeSnapshotDataSourceInSpec("test_snapshot", "", "snapshot.storage.k8s.io"),
}
for _, tc := range successTestCases {
@ -14864,13 +14863,17 @@ func TestAlphaVolumePVCDataSource(t *testing.T) {
expectedFail: true,
},
{
testName: "test specifying pvc with snapshot api group should fail",
claimSpec: *testDataSourceInSpec("test_snapshot", "PersistentVolumeClaim", "snapshot.storage.k8s.io"),
testName: "test missing kind in snapshot datasource should fail",
claimSpec: *testDataSourceInSpec("test_snapshot", "", "snapshot.storage.k8s.io"),
expectedFail: true,
},
{
testName: "test invalid group name in snapshot datasource should fail",
claimSpec: *testDataSourceInSpec("test_snapshot", "VolumeSnapshot", "storage.k8s.io"),
testName: "test create from valid generic custom resource source",
claimSpec: *testDataSourceInSpec("test_generic", "Generic", "generic.storage.k8s.io"),
},
{
testName: "test invalid datasource should fail",
claimSpec: *testDataSourceInSpec("test_pod", "Pod", ""),
expectedFail: true,
},
}

7
pkg/features/kube_features.go
View File

@ -564,6 +564,12 @@ const (
// e.g. emptyDir:
// medium: HugePages-1Gi
HugePageStorageMediumSize featuregate.Feature = "HugePageStorageMediumSize"
// owner: @bswartz
// alpha: v1.18
//
// Enables usage of any object for volume data source in PVCs
AnyVolumeDataSource featuregate.Feature = "AnyVolumeDataSource"
)
func init() {
@ -652,6 +658,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
ImmutableEphemeralVolumes: {Default: false, PreRelease: featuregate.Alpha},
DefaultIngressClass: {Default: true, PreRelease: featuregate.Beta},
HugePageStorageMediumSize: {Default: false, PreRelease: featuregate.Alpha},
AnyVolumeDataSource: {Default: false, PreRelease: featuregate.Alpha},
// inherited features from generic apiserver, relisted here to get a conflict if it is changed
// unintentionally on either side:

9
staging/src/k8s.io/api/core/v1/generated.proto
View File

@ -2640,11 +2640,12 @@ message PersistentVolumeClaimSpec {
// This field can be used to specify either:
// * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta)
// * An existing PVC (PersistentVolumeClaim)
// * An existing custom resource/object that implements data population (Alpha)
// In order to use VolumeSnapshot object types, the appropriate feature gate
// must be enabled (VolumeSnapshotDataSource)
// If the provisioner can support the specified data source, it will create
// a new volume based on the contents of the specified PVC or Snapshot.
// If the provisioner does not support the specified data source, the volume will
// must be enabled (VolumeSnapshotDataSource or AnyVolumeDataSource)
// If the provisioner or an external controller can support the specified data source,
// it will create a new volume based on the contents of the specified data source.
// If the specified data source is not supported, the volume will
// not be created and the failure will be reported as an event.
// In the future, we plan to support more data source types and the behavior
// of the provisioner may change.

9
staging/src/k8s.io/api/core/v1/types.go
View File

@ -464,11 +464,12 @@ type PersistentVolumeClaimSpec struct {
// This field can be used to specify either:
// * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta)
// * An existing PVC (PersistentVolumeClaim)
// * An existing custom resource/object that implements data population (Alpha)
// In order to use VolumeSnapshot object types, the appropriate feature gate
// must be enabled (VolumeSnapshotDataSource)
// If the provisioner can support the specified data source, it will create
// a new volume based on the contents of the specified PVC or Snapshot.
// If the provisioner does not support the specified data source, the volume will
// must be enabled (VolumeSnapshotDataSource or AnyVolumeDataSource)
// If the provisioner or an external controller can support the specified data source,
// it will create a new volume based on the contents of the specified data source.
// If the specified data source is not supported, the volume will
// not be created and the failure will be reported as an event.
// In the future, we plan to support more data source types and the behavior
// of the provisioner may change.

2
staging/src/k8s.io/api/core/v1/types_swagger_doc_generated.go generated
View File

@ -1301,7 +1301,7 @@ var map_PersistentVolumeClaimSpec = map[string]string{
"volumeName": "VolumeName is the binding reference to the PersistentVolume backing this claim.",
"storageClassName": "Name of the StorageClass required by the claim. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#class-1",
"volumeMode": "volumeMode defines what type of volume is required by the claim. Value of Filesystem is implied when not included in claim spec.",
"dataSource": "This field can be used to specify either: * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta) * An existing PVC (PersistentVolumeClaim) In order to use VolumeSnapshot object types, the appropriate feature gate must be enabled (VolumeSnapshotDataSource) If the provisioner can support the specified data source, it will create a new volume based on the contents of the specified PVC or Snapshot. If the provisioner does not support the specified data source, the volume will not be created and the failure will be reported as an event. In the future, we plan to support more data source types and the behavior of the provisioner may change.",
"dataSource": "This field can be used to specify either: * An existing VolumeSnapshot object (snapshot.storage.k8s.io/VolumeSnapshot - Beta) * An existing PVC (PersistentVolumeClaim) * An existing custom resource/object that implements data population (Alpha) In order to use VolumeSnapshot object types, the appropriate feature gate must be enabled (VolumeSnapshotDataSource or AnyVolumeDataSource) If the provisioner or an external controller can support the specified data source, it will create a new volume based on the contents of the specified data source. If the specified data source is not supported, the volume will not be created and the failure will be reported as an event. In the future, we plan to support more data source types and the behavior of the provisioner may change.",
}
func (PersistentVolumeClaimSpec) SwaggerDoc() map[string]string {