update corefile-migration library to 1.0.6

go.mod

@@ -37,7 +37,7 @@ require (
 	github.com/containerd/containerd v1.0.2 // indirect
 	github.com/containerd/typeurl v0.0.0-20190228175220-2a93cfde8c20 // indirect
 	github.com/containernetworking/cni v0.7.1
-	github.com/coredns/corefile-migration v1.0.4
+	github.com/coredns/corefile-migration v1.0.6
 	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
 	github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea
 	github.com/cpuguy83/go-md2man v1.0.10
@@ -232,7 +232,7 @@ replace (
 	github.com/containerd/containerd => github.com/containerd/containerd v1.0.2
 	github.com/containerd/typeurl => github.com/containerd/typeurl v0.0.0-20190228175220-2a93cfde8c20
 	github.com/containernetworking/cni => github.com/containernetworking/cni v0.7.1
-	github.com/coredns/corefile-migration => github.com/coredns/corefile-migration v1.0.4
+	github.com/coredns/corefile-migration => github.com/coredns/corefile-migration v1.0.6
 	github.com/coreos/etcd => github.com/coreos/etcd v3.3.10+incompatible
 	github.com/coreos/go-etcd => github.com/coreos/go-etcd v2.0.0+incompatible
 	github.com/coreos/go-oidc => github.com/coreos/go-oidc v2.1.0+incompatible

go.sum

@@ -106,8 +106,8 @@ github.com/containerd/typeurl v0.0.0-20190228175220-2a93cfde8c20 h1:14r0i3IeJj6z
 github.com/containerd/typeurl v0.0.0-20190228175220-2a93cfde8c20/go.mod h1:Cm3kwCdlkCfMSHURc+r6fwoGH6/F1hH3S4sg0rLFWPc=
 github.com/containernetworking/cni v0.7.1 h1:fE3r16wpSEyaqY4Z4oFrLMmIGfBYIKpPrHK31EJ9FzE=
 github.com/containernetworking/cni v0.7.1/go.mod h1:LGwApLUm2FpoOfxTDEeq8T9ipbpZ61X79hmU3w8FmsY=
-github.com/coredns/corefile-migration v1.0.4 h1:GpAwsgzgLA9HOnt3+Z69xsMVLl0doNnyVfBX79d/P5A=
-github.com/coredns/corefile-migration v1.0.4/go.mod h1:OFwBp/Wc9dJt5cAZzHWMNhK1r5L0p0jDwIBc6j8NC8E=
+github.com/coredns/corefile-migration v1.0.6 h1:hB6vclp2g/KeXe9n1oz/PafgieUahsOYeHMQA+RJ4Hg=
+github.com/coredns/corefile-migration v1.0.6/go.mod h1:OFwBp/Wc9dJt5cAZzHWMNhK1r5L0p0jDwIBc6j8NC8E=
 github.com/coreos/etcd v3.3.10+incompatible h1:jFneRYjIvLMLhDLCzuTuU4rSJUjRplcJQ7pD7MnhC04=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=

vendor/github.com/coredns/corefile-migration/migration/BUILD

@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "migrate.go",
         "notice.go",
+        "plugins.go",
         "versions.go",
     ],
     importmap = "k8s.io/kubernetes/vendor/github.com/coredns/corefile-migration/migration",

vendor/github.com/coredns/corefile-migration/migration/corefile/corefile.go

@@ -152,7 +152,7 @@ NextPlugin:
 }
 
 func (o *Option) FindMatch(def []*Option) (*Option, bool) {
-NextPlugin:
+NextOption:
 	for _, oDef := range def {
 		if oDef.Name != o.Name {
 			continue
@@ -165,7 +165,7 @@ NextPlugin:
 				return oDef, true
 			}
 			if i >= len(o.Args) || arg != o.Args[i] {
-				continue NextPlugin
+				continue NextOption
 			}
 		}
 		if len(oDef.Args) != len(o.Args) {

vendor/github.com/coredns/corefile-migration/migration/migrate.go

@@ -7,6 +7,7 @@ package migration
 
 import (
 	"fmt"
+	"regexp"
 	"sort"
 
 	"github.com/coredns/corefile-migration/migration/corefile"
@@ -43,17 +44,14 @@ func getStatus(fromCoreDNSVersion, toCoreDNSVersion, corefileStr, status string)
 		for _, s := range cf.Servers {
 			for _, p := range s.Plugins {
 				vp, present := Versions[v].plugins[p.Name]
-				if status == unsupported {
-					if present {
-						continue
-					}
+				if status == unsupported && !present {
 					notices = append(notices, Notice{Plugin: p.Name, Severity: status, Version: v})
 					continue
 				}
 				if !present {
 					continue
 				}
-				if vp.status != "" && vp.status != newdefault {
+				if vp.status != "" && vp.status != newdefault && status != unsupported {
 					notices = append(notices, Notice{
 						Plugin:     p.Name,
 						Severity:   vp.status,
@@ -64,18 +62,16 @@ func getStatus(fromCoreDNSVersion, toCoreDNSVersion, corefileStr, status string)
 					continue
 				}
 				for _, o := range p.Options {
-					vo, present := Versions[v].plugins[p.Name].options[o.Name]
+					vo, present := matchOption(o.Name, Versions[v].plugins[p.Name])
 					if status == unsupported {
 						if present {
 							continue
 						}
 						notices = append(notices, Notice{
-							Plugin:     p.Name,
-							Option:     o.Name,
-							Severity:   status,
-							Version:    v,
-							ReplacedBy: vo.replacedBy,
-							Additional: vo.additional,
+							Plugin:   p.Name,
+							Option:   o.Name,
+							Severity: status,
+							Version:  v,
 						})
 						continue
 					}
@@ -89,7 +85,7 @@ func getStatus(fromCoreDNSVersion, toCoreDNSVersion, corefileStr, status string)
 				}
 				if status != unsupported {
 				CheckForNewOptions:
-					for name, vo := range Versions[v].plugins[p.Name].options {
+					for name, vo := range Versions[v].plugins[p.Name].namedOptions {
 						if vo.status != newdefault {
 							continue
 						}
@@ -156,19 +152,9 @@ func Migrate(fromCoreDNSVersion, toCoreDNSVersion, corefileStr string, deprecati
 					newPlugs = append(newPlugs, p)
 					continue
 				}
-				if vp.action != nil {
-					p, err := vp.action(p)
-					if err != nil {
-						return "", err
-					}
-					if p == nil {
-						// remove plugin, skip options processing
-						continue
-					}
-				}
 				newOpts := []*corefile.Option{}
 				for _, o := range p.Options {
-					vo, present := Versions[v].plugins[p.Name].options[o.Name]
+					vo, present := matchOption(o.Name, Versions[v].plugins[p.Name])
 					if !present {
 						newOpts = append(newOpts, o)
 						continue
@@ -191,13 +177,23 @@ func Migrate(fromCoreDNSVersion, toCoreDNSVersion, corefileStr string, deprecati
 					}
 					newOpts = append(newOpts, o)
 				}
+				if vp.action != nil {
+					p, err := vp.action(p)
+					if err != nil {
+						return "", err
+					}
+					if p == nil {
+						// remove plugin, skip options processing
+						continue
+					}
+				}
 				newPlug := &corefile.Plugin{
 					Name:    p.Name,
 					Args:    p.Args,
 					Options: newOpts,
 				}
 			CheckForNewOptions:
-				for name, vo := range Versions[v].plugins[p.Name].options {
+				for name, vo := range Versions[v].plugins[p.Name].namedOptions {
 					if vo.status != newdefault {
 						continue
 					}
@@ -294,7 +290,7 @@ func MigrateDown(fromCoreDNSVersion, toCoreDNSVersion, corefileStr string) (stri
 
 				newOpts := []*corefile.Option{}
 				for _, o := range p.Options {
-					vo, present := Versions[v].plugins[p.Name].options[o.Name]
+					vo, present := matchOption(o.Name, Versions[v].plugins[p.Name])
 					if !present {
 						newOpts = append(newOpts, o)
 						continue
@@ -446,3 +442,22 @@ func validDownMigration(fromCoreDNSVersion, toCoreDNSVersion string) error {
 	}
 	return fmt.Errorf("cannot migrate down to '%v' from '%v'", toCoreDNSVersion, fromCoreDNSVersion)
 }
+
+func matchOption(oName string, p plugin) (*option, bool) {
+	o, exists := p.namedOptions[oName]
+	if exists {
+		o.name = oName
+		return &o, exists
+	}
+	for pattern, o := range p.patternOptions {
+		matched, err := regexp.MatchString(pattern, oName)
+		if err != nil {
+			continue
+		}
+		if matched {
+			o.name = oName
+			return &o, true
+		}
+	}
+	return nil, false
+}

vendor/github.com/coredns/corefile-migration/migration/plugins.go

@@ -0,0 +1,499 @@
+package migration
+
+import (
+	"errors"
+
+	"github.com/coredns/corefile-migration/migration/corefile"
+)
+
+type plugin struct {
+	status         string
+	replacedBy     string
+	additional     string
+	namedOptions   map[string]option
+	patternOptions map[string]option
+	action         pluginActionFn // action affecting this plugin only
+	add            serverActionFn // action to add a new plugin to the server block
+	downAction     pluginActionFn // downgrade action affecting this plugin only
+}
+
+type option struct {
+	name       string
+	status     string
+	replacedBy string
+	additional string
+	action     optionActionFn // action affecting this option only
+	add        pluginActionFn // action to add the option to the plugin
+	downAction optionActionFn // downgrade action affecting this option only
+}
+
+type corefileAction func(*corefile.Corefile) (*corefile.Corefile, error)
+type serverActionFn func(*corefile.Server) (*corefile.Server, error)
+type pluginActionFn func(*corefile.Plugin) (*corefile.Plugin, error)
+type optionActionFn func(*corefile.Option) (*corefile.Option, error)
+
+// plugins holds a map of plugin names and their migration rules per "version".  "Version" here is meaningless outside
+// of the context of this code. Each change in options or migration actions for a plugin requires a new "version"
+// containing those new/removed options and migration actions. Plugins in CoreDNS are not versioned.
+var plugins = map[string]map[string]plugin{
+	"kubernetes": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod":       {},
+				"endpoint":           {},
+				"tls":                {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream":           {},
+				"ttl":                {},
+				"noendpoints":        {},
+				"transfer":           {},
+				"fallthrough":        {},
+				"ignore":             {},
+			},
+		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod":       {},
+				"endpoint":           {},
+				"tls":                {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream":           {},
+				"ttl":                {},
+				"noendpoints":        {},
+				"transfer":           {},
+				"fallthrough":        {},
+				"ignore":             {},
+				"kubeconfig":         {}, // new option
+			},
+		},
+		"v3": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod": {},
+				"endpoint": { // new deprecation
+					status: deprecated,
+					action: useFirstArgumentOnly,
+				},
+				"tls":                {},
+				"kubeconfig":         {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream":           {},
+				"ttl":                {},
+				"noendpoints":        {},
+				"transfer":           {},
+				"fallthrough":        {},
+				"ignore":             {},
+			},
+		},
+		"v4": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod": {},
+				"endpoint": {
+					status: ignored,
+					action: useFirstArgumentOnly,
+				},
+				"tls":                {},
+				"kubeconfig":         {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream": { // new deprecation
+					status: deprecated,
+					action: removeOption,
+				},
+				"ttl":         {},
+				"noendpoints": {},
+				"transfer":    {},
+				"fallthrough": {},
+				"ignore":      {},
+			},
+		},
+		"v5": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod": { // new deprecation
+					status: deprecated,
+					action: removeOption,
+				},
+				"endpoint": {
+					status: ignored,
+					action: useFirstArgumentOnly,
+				},
+				"tls":                {},
+				"kubeconfig":         {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream": {
+					status: ignored,
+					action: removeOption,
+				},
+				"ttl":         {},
+				"noendpoints": {},
+				"transfer":    {},
+				"fallthrough": {},
+				"ignore":      {},
+			},
+		},
+		"v6": plugin{
+			namedOptions: map[string]option{
+				"resyncperiod": { // new removal
+					status: removed,
+					action: removeOption,
+				},
+				"endpoint": {
+					status: ignored,
+					action: useFirstArgumentOnly,
+				},
+				"tls":                {},
+				"kubeconfig":         {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream": {
+					status: ignored,
+					action: removeOption,
+				},
+				"ttl":         {},
+				"noendpoints": {},
+				"transfer":    {},
+				"fallthrough": {},
+				"ignore":      {},
+			},
+		},
+		"v7": plugin{
+			namedOptions: map[string]option{
+				// resyncperiod removed
+				"endpoint": {
+					status: ignored,
+					action: useFirstArgumentOnly,
+				},
+				"tls":                {},
+				"kubeconfig":         {},
+				"namespaces":         {},
+				"labels":             {},
+				"pods":               {},
+				"endpoint_pod_names": {},
+				"upstream": {
+					status: ignored,
+					action: removeOption,
+				},
+				"ttl":         {},
+				"noendpoints": {},
+				"transfer":    {},
+				"fallthrough": {},
+				"ignore":      {},
+			},
+		},
+	},
+
+	"errors": {
+		"v1": plugin{},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"consolidate": {},
+			},
+		},
+	},
+
+	"health": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"lameduck": {},
+			},
+		},
+		"v1 add lameduck": plugin{
+			namedOptions: map[string]option{
+				"lameduck": {
+					status: newdefault,
+					add: func(c *corefile.Plugin) (*corefile.Plugin, error) {
+						return addOptionToPlugin(c, &corefile.Option{Name: "lameduck 5s"})
+					},
+					downAction: removeOption,
+				},
+			},
+		},
+	},
+
+	"hosts": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"ttl":         {},
+				"no_reverse":  {},
+				"reload":      {},
+				"fallthrough": {},
+			},
+			patternOptions: map[string]option{
+				`\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}`:              {}, // close enough
+				`[0-9A-Fa-f]{1,4}:[:0-9A-Fa-f]+:[0-9A-Fa-f]{1,4}`: {}, // less close, but still close enough
+			},
+		},
+	},
+
+	"rewrite": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"type":        {},
+				"class":       {},
+				"name":        {},
+				"answer name": {},
+				"edns0":       {},
+			},
+		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"type":        {},
+				"class":       {},
+				"name":        {},
+				"answer name": {},
+				"edns0":       {},
+				"ttl":         {}, // new option
+			},
+		},
+	},
+
+	"log": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"class": {},
+			},
+		},
+	},
+
+	"cache": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"success":  {},
+				"denial":   {},
+				"prefetch": {},
+			},
+		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"success":     {},
+				"denial":      {},
+				"prefetch":    {},
+				"serve_stale": {}, // new option
+			},
+		},
+	},
+
+	"forward": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"except":         {},
+				"force_tcp":      {},
+				"expire":         {},
+				"max_fails":      {},
+				"tls":            {},
+				"tls_servername": {},
+				"policy":         {},
+				"health_check":   {},
+			},
+		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"except":         {},
+				"force_tcp":      {},
+				"prefer_udp":     {},
+				"expire":         {},
+				"max_fails":      {},
+				"tls":            {},
+				"tls_servername": {},
+				"policy":         {},
+				"health_check":   {},
+			},
+		},
+	},
+
+	"k8s_external": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"apex": {},
+				"ttl":  {},
+			},
+		},
+	},
+
+	"proxy": {
+		"v1": plugin{
+			namedOptions: map[string]option{
+				"policy":       {},
+				"fail_timeout": {},
+				"max_fails":    {},
+				"health_check": {},
+				"except":       {},
+				"spray":        {},
+				"protocol": { // https_google option ignored
+					status: ignored,
+					action: proxyRemoveHttpsGoogleProtocol,
+				},
+			},
+		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"policy":       {},
+				"fail_timeout": {},
+				"max_fails":    {},
+				"health_check": {},
+				"except":       {},
+				"spray":        {},
+				"protocol": { // https_google option removed
+					status: removed,
+					action: proxyRemoveHttpsGoogleProtocol,
+				},
+			},
+		},
+		"deprecation": plugin{ // proxy -> forward deprecation migration
+			status:       deprecated,
+			replacedBy:   "forward",
+			action:       proxyToForwardPluginAction,
+			namedOptions: proxyToForwardOptionsMigrations,
+		},
+		"removal": plugin{ // proxy -> forward forced migration
+			status:       removed,
+			replacedBy:   "forward",
+			action:       proxyToForwardPluginAction,
+			namedOptions: proxyToForwardOptionsMigrations,
+		},
+	},
+}
+
+func removePlugin(*corefile.Plugin) (*corefile.Plugin, error) { return nil, nil }
+func removeOption(*corefile.Option) (*corefile.Option, error) { return nil, nil }
+
+func renamePlugin(p *corefile.Plugin, to string) (*corefile.Plugin, error) {
+	p.Name = to
+	return p, nil
+}
+
+func addToServerBlockWithPlugins(sb *corefile.Server, newPlugin *corefile.Plugin, with []string) (*corefile.Server, error) {
+	if len(with) == 0 {
+		// add to all blocks
+		sb.Plugins = append(sb.Plugins, newPlugin)
+		return sb, nil
+	}
+	for _, p := range sb.Plugins {
+		for _, w := range with {
+			if w == p.Name {
+				// add to this block
+				sb.Plugins = append(sb.Plugins, newPlugin)
+				return sb, nil
+			}
+		}
+	}
+	return sb, nil
+}
+
+func addToKubernetesServerBlocks(sb *corefile.Server, newPlugin *corefile.Plugin) (*corefile.Server, error) {
+	return addToServerBlockWithPlugins(sb, newPlugin, []string{"kubernetes"})
+}
+
+func addToForwardingServerBlocks(sb *corefile.Server, newPlugin *corefile.Plugin) (*corefile.Server, error) {
+	return addToServerBlockWithPlugins(sb, newPlugin, []string{"forward", "proxy"})
+}
+
+func addToAllServerBlocks(sb *corefile.Server, newPlugin *corefile.Plugin) (*corefile.Server, error) {
+	return addToServerBlockWithPlugins(sb, newPlugin, []string{})
+}
+
+func addOptionToPlugin(pl *corefile.Plugin, newOption *corefile.Option) (*corefile.Plugin, error) {
+	pl.Options = append(pl.Options, newOption)
+	return pl, nil
+}
+
+var proxyToForwardOptionsMigrations = map[string]option{
+	"policy": {
+		action: func(o *corefile.Option) (*corefile.Option, error) {
+			if len(o.Args) == 1 && o.Args[0] == "least_conn" {
+				o.Name = "force_tcp"
+				o.Args = nil
+			}
+			return o, nil
+		},
+	},
+	"except":       {},
+	"fail_timeout": {action: removeOption},
+	"max_fails":    {action: removeOption},
+	"health_check": {action: removeOption},
+	"spray":        {action: removeOption},
+	"protocol": {
+		action: func(o *corefile.Option) (*corefile.Option, error) {
+			if len(o.Args) >= 2 && o.Args[0] == "force_tcp" {
+				o.Name = "force_tcp"
+				o.Args = nil
+				return o, nil
+			}
+			return nil, nil
+		},
+	},
+}
+
+var proxyToForwardPluginAction = func(p *corefile.Plugin) (*corefile.Plugin, error) {
+	return renamePlugin(p, "forward")
+}
+
+var useFirstArgumentOnly = func(o *corefile.Option) (*corefile.Option, error) {
+	if len(o.Args) < 1 {
+		return o, nil
+	}
+	o.Args = o.Args[:1]
+	return o, nil
+}
+
+var proxyRemoveHttpsGoogleProtocol = func(o *corefile.Option) (*corefile.Option, error) {
+	if len(o.Args) > 0 && o.Args[0] == "https_google" {
+		return nil, nil
+	}
+	return o, nil
+}
+
+func breakForwardStubDomainsIntoServerBlocks(cf *corefile.Corefile) (*corefile.Corefile, error) {
+	for _, sb := range cf.Servers {
+		for j, fwd := range sb.Plugins {
+			if fwd.Name != "forward" {
+				continue
+			}
+			if len(fwd.Args) == 0 {
+				return nil, errors.New("found invalid forward plugin declaration")
+			}
+			if fwd.Args[0] == "." {
+				// dont move the default upstream
+				continue
+			}
+			if len(sb.DomPorts) != 1 {
+				return cf, errors.New("unhandled migration of multi-domain/port server block")
+			}
+			if sb.DomPorts[0] != "." && sb.DomPorts[0] != ".:53" {
+				return cf, errors.New("unhandled migration of non-default domain/port server block")
+			}
+
+			newSb := &corefile.Server{}                // create a new server block
+			newSb.DomPorts = []string{fwd.Args[0]}     // copy the forward zone to the server block domain
+			fwd.Args[0] = "."                          // the plugin's zone changes to "." for brevity
+			newSb.Plugins = append(newSb.Plugins, fwd) // add the plugin to its new server block
+
+			// Add appropriate addtl plugins to new server block
+			newSb.Plugins = append(newSb.Plugins, &corefile.Plugin{Name: "loop"})
+			newSb.Plugins = append(newSb.Plugins, &corefile.Plugin{Name: "errors"})
+			newSb.Plugins = append(newSb.Plugins, &corefile.Plugin{Name: "cache", Args: []string{"30"}})
+
+			//add new server block to corefile
+			cf.Servers = append(cf.Servers, newSb)
+
+			//remove the forward plugin from the original server block
+			sb.Plugins = append(sb.Plugins[:j], sb.Plugins[j+1:]...)
+		}
+	}
+	return cf, nil
+}

vendor/modules.txt

@@ -186,7 +186,7 @@ github.com/containernetworking/cni/pkg/types
 github.com/containernetworking/cni/pkg/types/020
 github.com/containernetworking/cni/pkg/types/current
 github.com/containernetworking/cni/pkg/version
-# github.com/coredns/corefile-migration v1.0.4 => github.com/coredns/corefile-migration v1.0.4
+# github.com/coredns/corefile-migration v1.0.6 => github.com/coredns/corefile-migration v1.0.6
 github.com/coredns/corefile-migration/migration
 github.com/coredns/corefile-migration/migration/corefile
 # github.com/coreos/go-oidc v2.1.0+incompatible => github.com/coreos/go-oidc v2.1.0+incompatible