Add support for --runtime-config=api/beta=false, --feature-gates=AllB…

…eta=false

Allow disabling all beta features and APIs

cmd/kube-apiserver/app/options/options.go

@@ -142,7 +142,7 @@ func (s *ServerRunOptions) Flags() (fss cliflag.NamedFlagSets) {
 	s.Authentication.AddFlags(fss.FlagSet("authentication"))
 	s.Authorization.AddFlags(fss.FlagSet("authorization"))
 	s.CloudProvider.AddFlags(fss.FlagSet("cloud provider"))
-	s.APIEnablement.AddFlags(fss.FlagSet("api enablement"))
+	s.APIEnablement.AddFlags(fss.FlagSet("API enablement"))
 	s.EgressSelector.AddFlags(fss.FlagSet("egress selector"))
 	s.Admission.AddFlags(fss.FlagSet("admission"))
 

staging/src/k8s.io/apiserver/pkg/server/options/api_enablement.go

@@ -43,11 +43,14 @@ func NewAPIEnablementOptions() *APIEnablementOptions {
 // AddFlags adds flags for a specific APIServer to the specified FlagSet
 func (s *APIEnablementOptions) AddFlags(fs *pflag.FlagSet) {
 	fs.Var(&s.RuntimeConfig, "runtime-config", ""+
-		"A set of key=value pairs that describe runtime configuration that may be passed "+
-		"to apiserver. <group>/<version> (or <version> for the core group) key can be used to "+
-		"turn on/off specific api versions. api/all is special key to control all api versions, "+
-		"be careful setting it false, unless you know what you do. api/legacy is deprecated, "+
-		"we will remove it in the future, so stop using it.")
+		"A set of key=value pairs that enable or disable built-in APIs. Supported options are:\n"+
+		"v1=true|false for the core API group\n"+
+		"<group>/<version>=true|false for a specific API group and version (e.g. apps/v1=true)\n"+
+		"api/all=true|false controls all API versions\n"+
+		"api/ga=true|false controls all API versions of the form v[0-9]+\n"+
+		"api/beta=true|false controls all API versions of the form v[0-9]+beta[0-9]+\n"+
+		"api/alpha=true|false controls all API versions of the form v[0-9]+alpha[0-9]+\n"+
+		"api/legacy is deprecated, and will be removed in a future version")
 }
 
 // Validate validates RuntimeConfig with a list of registries.
@@ -61,9 +64,9 @@ func (s *APIEnablementOptions) Validate(registries ...GroupRegisty) []error {
 	}
 
 	errors := []error{}
-	if s.RuntimeConfig["api/all"] == "false" && len(s.RuntimeConfig) == 1 {
+	if s.RuntimeConfig[resourceconfig.APIAll] == "false" && len(s.RuntimeConfig) == 1 {
 		// Do not allow only set api/all=false, in such case apiserver startup has no meaning.
-		return append(errors, fmt.Errorf("invalid key with only api/all=false"))
+		return append(errors, fmt.Errorf("invalid key with only %v=false", resourceconfig.APIAll))
 	}
 
 	groups, err := resourceconfig.ParseGroups(s.RuntimeConfig)

staging/src/k8s.io/apiserver/pkg/server/resourceconfig/helpers.go

@@ -18,6 +18,7 @@ package resourceconfig
 
 import (
 	"fmt"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -51,6 +52,33 @@ func MergeResourceEncodingConfigs(
 	return resourceEncodingConfig
 }
 
+// Recognized values for the --runtime-config parameter to enable/disable groups of APIs
+const (
+	APIAll   = "api/all"
+	APIGA    = "api/ga"
+	APIBeta  = "api/beta"
+	APIAlpha = "api/alpha"
+)
+
+var (
+	gaPattern    = regexp.MustCompile(`^v\d+$`)
+	betaPattern  = regexp.MustCompile(`^v\d+beta\d+$`)
+	alphaPattern = regexp.MustCompile(`^v\d+alpha\d+$`)
+
+	matchers = map[string]func(gv schema.GroupVersion) bool{
+		// allows users to address all api versions
+		APIAll: func(gv schema.GroupVersion) bool { return true },
+		// allows users to address all api versions in the form v[0-9]+
+		APIGA: func(gv schema.GroupVersion) bool { return gaPattern.MatchString(gv.Version) },
+		// allows users to address all beta api versions
+		APIBeta: func(gv schema.GroupVersion) bool { return betaPattern.MatchString(gv.Version) },
+		// allows users to address all alpha api versions
+		APIAlpha: func(gv schema.GroupVersion) bool { return alphaPattern.MatchString(gv.Version) },
+	}
+
+	matcherOrder = []string{APIAll, APIGA, APIBeta, APIAlpha}
+)
+
 // MergeAPIResourceConfigs merges the given defaultAPIResourceConfig with the given resourceConfigOverrides.
 // Exclude the groups not registered in registry, and check if version is
 // not registered in group, then it will fail.
@@ -62,14 +90,15 @@ func MergeAPIResourceConfigs(
 	resourceConfig := defaultAPIResourceConfig
 	overrides := resourceConfigOverrides
 
-	// "api/all=false" allows users to selectively enable specific api versions.
-	allAPIFlagValue, ok := overrides["api/all"]
-	if ok {
-		if allAPIFlagValue == "false" {
-			// Disable all group versions.
-			resourceConfig.DisableAll()
-		} else if allAPIFlagValue == "true" {
-			resourceConfig.EnableAll()
+	for _, flag := range matcherOrder {
+		if value, ok := overrides[flag]; ok {
+			if value == "false" {
+				resourceConfig.DisableMatchingVersions(matchers[flag])
+			} else if value == "true" {
+				resourceConfig.EnableMatchingVersions(matchers[flag])
+			} else {
+				return nil, fmt.Errorf("invalid value %v=%v", flag, value)
+			}
 		}
 	}
 
@@ -78,7 +107,7 @@ func MergeAPIResourceConfigs(
 	// Iterate through all group/version overrides specified in runtimeConfig.
 	for key := range overrides {
 		// Have already handled them above. Can skip them here.
-		if key == "api/all" {
+		if _, ok := matchers[key]; ok {
 			continue
 		}
 
@@ -153,7 +182,7 @@ func getRuntimeConfigValue(overrides cliflag.ConfigurationMap, apiKey string, de
 func ParseGroups(resourceConfig cliflag.ConfigurationMap) ([]string, error) {
 	groups := []string{}
 	for key := range resourceConfig {
-		if key == "api/all" {
+		if _, ok := matchers[key]; ok {
 			continue
 		}
 		tokens := strings.Split(key, "/")

staging/src/k8s.io/apiserver/pkg/server/resourceconfig/helpers_test.go

@@ -195,6 +195,21 @@ func TestParseRuntimeConfig(t *testing.T) {
 			},
 			err: false, // no error for backwards compatibility
 		},
+		{
+			// disable all beta resources
+			runtimeConfig: map[string]string{
+				"api/beta": "false",
+			},
+			defaultResourceConfig: func() *serverstore.ResourceConfig {
+				return newFakeAPIResourceConfigSource()
+			},
+			expectedAPIConfig: func() *serverstore.ResourceConfig {
+				config := newFakeAPIResourceConfigSource()
+				config.DisableVersions(extensionsapiv1beta1.SchemeGroupVersion)
+				return config
+			},
+			err: false, // no error for backwards compatibility
+		},
 	}
 	for index, test := range testCases {
 		t.Log(scheme.PrioritizedVersionsAllGroups())

staging/src/k8s.io/apiserver/pkg/server/storage/resource_config.go

@@ -52,6 +52,24 @@ func (o *ResourceConfig) EnableAll() {
 	}
 }
 
+// DisableMatchingVersions disables all group/versions for which the matcher function returns true. It does not modify individual resource enablement/disablement.
+func (o *ResourceConfig) DisableMatchingVersions(matcher func(gv schema.GroupVersion) bool) {
+	for k := range o.GroupVersionConfigs {
+		if matcher(k) {
+			o.GroupVersionConfigs[k] = false
+		}
+	}
+}
+
+// EnableMatchingVersions enables all group/versions for which the matcher function returns true. It does not modify individual resource enablement/disablement.
+func (o *ResourceConfig) EnableMatchingVersions(matcher func(gv schema.GroupVersion) bool) {
+	for k := range o.GroupVersionConfigs {
+		if matcher(k) {
+			o.GroupVersionConfigs[k] = true
+		}
+	}
+}
+
 // DisableVersions disables the versions entirely.
 func (o *ResourceConfig) DisableVersions(versions ...schema.GroupVersion) {
 	for _, version := range versions {

staging/src/k8s.io/component-base/featuregate/feature_gate.go

@@ -40,17 +40,25 @@ const (
 	//   AllAlpha=false,NewFeature=true  will result in newFeature=true
 	//   AllAlpha=true,NewFeature=false  will result in newFeature=false
 	allAlphaGate Feature = "AllAlpha"
+
+	// allBetaGate is a global toggle for beta features. Per-feature key
+	// values override the default set by allBetaGate. Examples:
+	//   AllBeta=false,NewFeature=true  will result in NewFeature=true
+	//   AllBeta=true,NewFeature=false  will result in NewFeature=false
+	allBetaGate Feature = "AllBeta"
 )
 
 var (
 	// The generic features.
 	defaultFeatures = map[Feature]FeatureSpec{
 		allAlphaGate: {Default: false, PreRelease: Alpha},
+		allBetaGate:  {Default: false, PreRelease: Beta},
 	}
 
 	// Special handling for a few gates.
 	specialFeatures = map[Feature]func(known map[Feature]FeatureSpec, enabled map[Feature]bool, val bool){
 		allAlphaGate: setUnsetAlphaGates,
+		allBetaGate:  setUnsetBetaGates,
 	}
 )
 
@@ -129,6 +137,16 @@ func setUnsetAlphaGates(known map[Feature]FeatureSpec, enabled map[Feature]bool,
 	}
 }
 
+func setUnsetBetaGates(known map[Feature]FeatureSpec, enabled map[Feature]bool, val bool) {
+	for k, v := range known {
+		if v.PreRelease == Beta {
+			if _, found := enabled[k]; !found {
+				enabled[k] = val
+			}
+		}
+	}
+}
+
 // Set, String, and Type implement pflag.Value
 var _ pflag.Value = &featureGate{}