Use gengo/v2 in kube-openapi

cmd/openapi-gen/args/args.go

@@ -18,59 +18,61 @@ package args
 
 import (
 	"fmt"
-	"path/filepath"
 
 	"github.com/spf13/pflag"
-	"k8s.io/gengo/args"
 )
 
-// CustomArgs is used by the gengo framework to pass args specific to this generator.
-type CustomArgs struct {
-	// ReportFilename is added to CustomArgs for specifying name of report file used
+type Args struct {
+	OutputDir  string // must be a directory path
+	OutputPkg  string // must be a Go import-path
+	OutputFile string
+
+	GoHeaderFile string
+
+	// ReportFilename is added to Args for specifying name of report file used
 	// by API linter. If specified, API rule violations will be printed to report file.
 	// Otherwise default value "-" will be used which indicates stdout.
 	ReportFilename string
 }
 
-// NewDefaults returns default arguments for the generator. Returning the arguments instead
+// New returns default arguments for the generator. Returning the arguments instead
 // of using default flag parsing allows registering custom arguments afterwards
-func NewDefaults() (*args.GeneratorArgs, *CustomArgs) {
-	// Default() sets a couple of flag default values for example the boilerplate.
-	// WithoutDefaultFlagParsing() disables implicit addition of command line flags and parsing,
-	// which allows registering custom arguments afterwards
-	genericArgs := args.Default().WithoutDefaultFlagParsing()
-	genericArgs.GoHeaderFilePath = filepath.Join(args.DefaultSourceTree(), "k8s.io/kube-openapi/boilerplate/boilerplate.go.txt")
-
-	customArgs := &CustomArgs{}
-	genericArgs.CustomArgs = customArgs
+func New() *Args {
+	args := &Args{}
 
 	// Default value for report filename is "-", which stands for stdout
-	customArgs.ReportFilename = "-"
-	// Default value for output file base name
-	genericArgs.OutputFileBaseName = "openapi_generated"
+	args.ReportFilename = "-"
 
-	return genericArgs, customArgs
+	return args
 }
 
 // AddFlags add the generator flags to the flag set.
-func (c *CustomArgs) AddFlags(fs *pflag.FlagSet) {
-	fs.StringVarP(&c.ReportFilename, "report-filename", "r", c.ReportFilename, "Name of report file used by API linter to print API violations. Default \"-\" stands for standard output. NOTE that if valid filename other than \"-\" is specified, API linter won't return error on detected API violations. This allows further check of existing API violations without stopping the OpenAPI generation toolchain.")
+func (args *Args) AddFlags(fs *pflag.FlagSet) {
+	fs.StringVar(&args.OutputDir, "output-dir", "",
+		"the base directory under which to generate results")
+	fs.StringVar(&args.OutputPkg, "output-pkg", "",
+		"the base Go import-path under which to generate results")
+	fs.StringVar(&args.OutputFile, "output-file", "generated.openapi.go",
+		"the name of the file to be generated")
+	fs.StringVar(&args.GoHeaderFile, "go-header-file", "",
+		"the path to a file containing boilerplate header text; the string \"YEAR\" will be replaced with the current 4-digit year")
+	fs.StringVarP(&args.ReportFilename, "report-filename", "r", "-",
+		"Name of report file used by API linter to print API violations. Default \"-\" stands for standard output. NOTE that if valid filename other than \"-\" is specified, API linter won't return error on detected API violations. This allows further check of existing API violations without stopping the OpenAPI generation toolchain.")
 }
 
 // Validate checks the given arguments.
-func Validate(genericArgs *args.GeneratorArgs) error {
-	c, ok := genericArgs.CustomArgs.(*CustomArgs)
-	if !ok {
-		return fmt.Errorf("input arguments don't contain valid custom arguments")
+func (args *Args) Validate() error {
+	if len(args.OutputDir) == 0 {
+		return fmt.Errorf("--output-dir must be specified")
 	}
-	if len(c.ReportFilename) == 0 {
-		return fmt.Errorf("report filename cannot be empty. specify a valid filename or use \"-\" for stdout")
+	if len(args.OutputPkg) == 0 {
+		return fmt.Errorf("--output-pkg must be specified")
 	}
-	if len(genericArgs.OutputFileBaseName) == 0 {
-		return fmt.Errorf("output file base name cannot be empty")
+	if len(args.OutputFile) == 0 {
+		return fmt.Errorf("--output-file must be specified")
 	}
-	if len(genericArgs.OutputPackagePath) == 0 {
-		return fmt.Errorf("output package cannot be empty")
+	if len(args.ReportFilename) == 0 {
+		return fmt.Errorf("--report-filename must be specified (use \"-\" for stdout)")
 	}
 	return nil
 }

cmd/openapi-gen/openapi-gen.go

@@ -24,33 +24,38 @@ import (
 	"flag"
 	"log"
 
-	generatorargs "k8s.io/kube-openapi/cmd/openapi-gen/args"
-	"k8s.io/kube-openapi/pkg/generators"
-
 	"github.com/spf13/pflag"
-
+	"k8s.io/gengo/v2"
+	"k8s.io/gengo/v2/generator"
 	"k8s.io/klog/v2"
+	"k8s.io/kube-openapi/cmd/openapi-gen/args"
+	"k8s.io/kube-openapi/pkg/generators"
 )
 
 func main() {
 	klog.InitFlags(nil)
-	genericArgs, customArgs := generatorargs.NewDefaults()
+	args := args.New()
 
-	genericArgs.AddFlags(pflag.CommandLine)
-	customArgs.AddFlags(pflag.CommandLine)
+	args.AddFlags(pflag.CommandLine)
 	flag.Set("logtostderr", "true")
 	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
 	pflag.Parse()
 
-	if err := generatorargs.Validate(genericArgs); err != nil {
+	if err := args.Validate(); err != nil {
 		log.Fatalf("Arguments validation error: %v", err)
 	}
 
+	myTargets := func(context *generator.Context) []generator.Target {
+		return generators.GetTargets(context, args)
+	}
+
 	// Generates the code for the OpenAPIDefinitions.
-	if err := genericArgs.Execute(
+	if err := gengo.Execute(
 		generators.NameSystems(),
 		generators.DefaultNameSystem(),
-		generators.Packages,
+		myTargets,
+		gengo.StdBuildTag,
+		pflag.Args(),
 	); err != nil {
 		log.Fatalf("OpenAPI code generation error: %v", err)
 	}

go.mod

@@ -1,6 +1,6 @@
 module k8s.io/kube-openapi
 
-go 1.21
+go 1.21.3
 
 require (
 	github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46
@@ -18,10 +18,11 @@ require (
 	github.com/onsi/gomega v1.19.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.8.1
+	golang.org/x/tools v0.18.0
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/yaml.v2 v2.4.0
 	gopkg.in/yaml.v3 v3.0.1
-	k8s.io/gengo v0.0.0-20230829151522-9cce18d56c01
+	k8s.io/gengo/v2 v2.0.0-20240226174109-00c4be8627da
 	k8s.io/klog/v2 v2.80.1
 	k8s.io/utils v0.0.0-20230726121419-3b25d923346b
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd
@@ -39,10 +40,9 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	golang.org/x/mod v0.7.0 // indirect
-	golang.org/x/net v0.7.0 // indirect
-	golang.org/x/sys v0.5.0 // indirect
-	golang.org/x/text v0.7.0 // indirect
-	golang.org/x/tools v0.4.0 // indirect
+	golang.org/x/mod v0.15.0 // indirect
+	golang.org/x/net v0.21.0 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 )

go.sum

@@ -8,7 +8,6 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/emicklei/go-restful/v3 v3.8.0 h1:eCZ8ulSerjdAiaNpF7GxXIE7ZCMo1moN1qX+S609eVw=
 github.com/emicklei/go-restful/v3 v3.8.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
-github.com/go-logr/logr v0.2.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
 github.com/go-logr/logr v1.2.0 h1:QK40JKJyMdUDz+h+xvCsru/bJhvG0UxvePV0ufL/AcE=
 github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE=
@@ -22,7 +21,6 @@ github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw
 github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/gnostic-models v0.6.8 h1:yo/ABAfM5IMRsS1VnXjTBvUb61tFIHozhlYvRgGre9I=
 github.com/google/gnostic-models v0.6.8/go.mod h1:5n7qKqH0f5wFt+aWF8CW6pZLLNOfYuF5OpfBSENuI8U=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -34,7 +32,6 @@ github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8Hm
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
-github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
@@ -66,32 +63,18 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
-golang.org/x/mod v0.7.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.7.0 h1:rJrUqqhjsgNp7KqAIc25s9pZnjU7TUcSY7HcVZjdn1g=
-golang.org/x/net v0.7.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
-golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20200505023115-26f46d2f7ef8/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.4.0 h1:7mTAgkunk3fr4GAloyyCasadO6h9zSsQZbwvcaIciV4=
-golang.org/x/tools v0.4.0/go.mod h1:UE5sM2OK9E/d67R0ANs2xJizIymRP5gJU295PvKXxjQ=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/mod v0.15.0 h1:SernR4v+D55NyBH2QiEQrlBAnj1ECL6AGrA5+dPaMY8=
+golang.org/x/mod v0.15.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
+golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/tools v0.18.0 h1:k8NLag8AGHnn+PHbl7g43CtqZAwG60vZkLqgyZgIHgQ=
+golang.org/x/tools v0.18.0/go.mod h1:GL7B4CwcLLeo59yx/9UWWuNOW1n3VZ4f5axWfML7Lcg=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
 golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
@@ -100,7 +83,6 @@ google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
 google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -109,9 +91,8 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-k8s.io/gengo v0.0.0-20230829151522-9cce18d56c01 h1:pWEwq4Asjm4vjW7vcsmijwBhOr1/shsbSYiWXmNGlks=
-k8s.io/gengo v0.0.0-20230829151522-9cce18d56c01/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
-k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
+k8s.io/gengo/v2 v2.0.0-20240226174109-00c4be8627da h1:TthpcphFcSU/2R2/j67duxXOSRdUGP2ZOAG4TyGgz5c=
+k8s.io/gengo/v2 v2.0.0-20240226174109-00c4be8627da/go.mod h1:5177teI4XU3cmd0ZSDKF3jxMubfjilA5FNOegKTCgK4=
 k8s.io/klog/v2 v2.80.1 h1:atnLQ121W371wYYFawwYx1aEY2eUfs4l3J72wtgAwV4=
 k8s.io/klog/v2 v2.80.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0=
 k8s.io/utils v0.0.0-20230726121419-3b25d923346b h1:sgn3ZU783SCgtaSJjpcVVlRqd6GSnlTLKgpAAttJvpI=

pkg/generators/api_linter.go

@@ -25,8 +25,8 @@ import (
 
 	"k8s.io/kube-openapi/pkg/generators/rules"
 
-	"k8s.io/gengo/generator"
-	"k8s.io/gengo/types"
+	"k8s.io/gengo/v2/generator"
+	"k8s.io/gengo/v2/types"
 	"k8s.io/klog/v2"
 )
 
@@ -94,7 +94,7 @@ func newAPIViolationGen() *apiViolationGen {
 }
 
 type apiViolationGen struct {
-	generator.DefaultGen
+	generator.GoGenerator
 
 	linter *apiLinter
 }

pkg/generators/config.go

@@ -17,16 +17,14 @@ limitations under the License.
 package generators
 
 import (
-	"fmt"
 	"path/filepath"
 
-	"k8s.io/gengo/args"
-	"k8s.io/gengo/generator"
-	"k8s.io/gengo/namer"
-	"k8s.io/gengo/types"
+	"k8s.io/gengo/v2"
+	"k8s.io/gengo/v2/generator"
+	"k8s.io/gengo/v2/namer"
+	"k8s.io/gengo/v2/types"
 	"k8s.io/klog/v2"
-
-	generatorargs "k8s.io/kube-openapi/cmd/openapi-gen/args"
+	"k8s.io/kube-openapi/cmd/openapi-gen/args"
 )
 
 type identityNamer struct{}
@@ -51,36 +49,31 @@ func DefaultNameSystem() string {
 	return "sorting_namer"
 }
 
-func Packages(context *generator.Context, arguments *args.GeneratorArgs) generator.Packages {
-	boilerplate, err := arguments.LoadGoBoilerplate()
+func GetTargets(context *generator.Context, args *args.Args) []generator.Target {
+	boilerplate, err := gengo.GoBoilerplate(args.GoHeaderFile, gengo.StdBuildTag, gengo.StdGeneratedBy)
 	if err != nil {
 		klog.Fatalf("Failed loading boilerplate: %v", err)
 	}
-	header := append([]byte(fmt.Sprintf("// +build !%s\n\n", arguments.GeneratedBuildTag)), boilerplate...)
-	header = append(header, []byte(
-		`
-// This file was autogenerated by openapi-gen. Do not edit it manually!
-
-`)...)
 
 	reportPath := "-"
-	if customArgs, ok := arguments.CustomArgs.(*generatorargs.CustomArgs); ok {
-		reportPath = customArgs.ReportFilename
+	if args.ReportFilename != "" {
+		reportPath = args.ReportFilename
 	}
 	context.FileTypes[apiViolationFileType] = apiViolationFile{
 		unmangledPath: reportPath,
 	}
 
-	return generator.Packages{
-		&generator.DefaultPackage{
-			PackageName: filepath.Base(arguments.OutputPackagePath),
-			PackagePath: arguments.OutputPackagePath,
-			HeaderText:  header,
-			GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
+	return []generator.Target{
+		&generator.SimpleTarget{
+			PkgName:       filepath.Base(args.OutputPkg),
+			PkgPath:       args.OutputPkg,
+			PkgDir:        args.OutputDir,
+			HeaderComment: boilerplate,
+			GeneratorsFunc: func(c *generator.Context) (generators []generator.Generator) {
 				return []generator.Generator{
 					newOpenAPIGen(
-						arguments.OutputFileBaseName,
-						arguments.OutputPackagePath,
+						args.OutputFile,
+						args.OutputPkg,
 					),
 					newAPIViolationGen(),
 				}

pkg/generators/enum.go

@@ -22,8 +22,9 @@ import (
 	"sort"
 	"strings"
 
-	"k8s.io/gengo/generator"
-	"k8s.io/gengo/types"
+	"k8s.io/gengo/v2"
+	"k8s.io/gengo/v2/generator"
+	"k8s.io/gengo/v2/types"
 )
 
 const tagEnumType = "enum"
@@ -163,7 +164,7 @@ func isEnumType(stringType *types.Type, t *types.Type) bool {
 }
 
 func hasEnumTag(t *types.Type) bool {
-	return types.ExtractCommentTags("+", t.CommentLines)[tagEnumType] != nil
+	return gengo.ExtractCommentTags("+", t.CommentLines)[tagEnumType] != nil
 }
 
 // whitespaceRegex is the regex for consecutive whitespaces.

pkg/generators/enum_test.go

@@ -21,8 +21,8 @@ import (
 	"sort"
 	"testing"
 
-	"k8s.io/gengo/generator"
-	"k8s.io/gengo/types"
+	"k8s.io/gengo/v2/generator"
+	"k8s.io/gengo/v2/types"
 )
 
 func TestParseEnums(t *testing.T) {