added support for multiple kubernetes openapi schemas

kyaml/openapi/Makefile

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 MYGOBIN := $(shell go env GOPATH)/bin
+API_VERSION := "v1.19.1"
 
 .PHONY: all
 all: \
@@ -12,14 +13,13 @@ all: \
 .PHONY: clean
 clean:
 	rm kustomizationapi/swagger.go
-	rm kubernetesapi/swagger.go
 	rm kubernetesapi/openapiinfo.go
 
-# To get swagger.json, we need a cluster at the correct version,
+# This will remove all currently built-in schema,
 # so think twice before deleting.
 .PHONY: nuke
 nuke: clean
-	rm kubernetesapi/swagger.json
+	rm -r kubernetesapi/*
 
 $(MYGOBIN)/go-bindata:
 	go install github.com/go-bindata/go-bindata/v3/go-bindata
@@ -37,26 +37,20 @@ $(MYGOBIN)/kind:
 $(MYGOBIN)/kpt:
 	../../hack/install_kpt.sh 0.34.0 $(MYGOBIN)
 
-kubernetesapi/swagger.go: $(MYGOBIN)/go-bindata kubernetesapi/swagger.json
-	$(MYGOBIN)/go-bindata \
-		--pkg kubernetesapi \
-		-o kubernetesapi/swagger.go \
-		kubernetesapi/swagger.json
-
 kustomizationapi/swagger.go: $(MYGOBIN)/go-bindata kustomizationapi/swagger.json
 	$(MYGOBIN)/go-bindata \
 		--pkg kustomizationapi \
 		-o kustomizationapi/swagger.go \
 		kustomizationapi/swagger.json
 
-kubernetesapi/openapiinfo.go: kubernetesapi/swagger.json
+.PHONY: kubernetesapi/openapiinfo.go
-	./makeOpenApiInfoDotGo.sh kubernetesapi/swagger.json
+kubernetesapi/openapiinfo.go:
+	./scripts/makeOpenApiInfoDotGo.sh
 
-API_VERSION="v1.19.1"
+.PHONY: kubernetesapi/swagger.json
 kubernetesapi/swagger.json: $(MYGOBIN)/kind $(MYGOBIN)/kpt
-	cp $(HOME)/.kube/config /tmp/kubeconfig.txt | true
+	./scripts/fetchSchemaFromCluster.sh $(API_VERSION)
-	$(MYGOBIN)/kind create cluster --image kindest/node:$(API_VERSION) --name=getopenapidata
+
-	$(MYGOBIN)/kpt live  fetch-k8s-schema  --pretty-print > /tmp/new_swagger.json
+.PHONY: kubernetesapi/swagger.go
-	$(MYGOBIN)/kind delete cluster --name=getopenapidata
+kubernetesapi/swagger.go: $(MYGOBIN)/go-bindata kubernetesapi/swagger.json
-	cp /tmp/kubeconfig.txt $(HOME)/.kube/config | true
+	./scripts/generateSwaggerDotGo.sh $(API_VERSION)
-	cp /tmp/new_swagger.json kubernetesapi/swagger.json

kyaml/openapi/README.md

@@ -1,35 +1,57 @@
 # Sampling New OpenAPI Data
 
-[OpenAPI schema]: ./kubernetesapi/swagger.json
+[OpenAPI schema]: ./kubernetesapi/
+[kind clusters]: https://hub.docker.com/r/kindest/node/tags
 
 This document describes how to fetch OpenAPI data from
-a particular kubernetes version number.
+a particular kubernetes version number. Note that you can
+only fetch data from versions supported by [kind clusters].
 
-### Fetching the Schema
+### Delete all currently built-in schema
+```
+make nuke
+```
 
-In this directory, fetch the openapi schema for the kubernetes api:
+### Add a new built-in schema
+
+In this directory, fetch the openapi schema and generate the 
+corresponding swagger.go for the kubernetes api: 
+
+```
+make kubernetesapi/swagger.go
+```
+
+To fetch the schema without generating the swagger.go, you can
+run:
 
 ```
 make nuke
 make kubernetesapi/swagger.json
 ```
 
+Note that generating the swagger.go will re-fetch the schema.
+
 You can specify a specific version with the "API_VERSION"
 parameter. The default version is v1.19.1. Here is an
-example for fetching the data for v1.14.1.
+example for generating swagger.go for v1.14.1.
 
 ```
-make kubernetesapi/swagger.json API_VERSION=v1.14.1
+make kubernetesapi/swagger.go API_VERSION=v1.14.1
 ```
 
-This will update the [OpenAPI schema].
+This will update the [OpenAPI schema]. The above command will
+create a directory kubernetesapi/v1141 and store the resulting
+swagger.json and swagger.go files there. 
 
-### Generating Swagger.go
+### Make the schema available for use
 
-In this directory, generate the swagger.go files.
+While the above commands generate the swagger.go files, they
+do not make them available for use nor do they update the
+info field reported by `kustomize openapi info`. To make the
+newly fetched schema and swagger.go available:
 
 ```
-make
+make kubernetesapi/openapiinfo.go
 ```
 
 ### Run all tests

kyaml/openapi/kubernetesapi/openapiinfo.go

@@ -1,8 +1,26 @@
 // Copyright 2020 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-// Code generated by ./makeOpenApiInfoDotGo.sh; DO NOT EDIT.
+// Code generated by ./scripts/makeOpenApiInfoDotGo.sh; DO NOT EDIT.
 
 package kubernetesapi
 
-const Info = "{title:Kubernetes,version:v1.17.0}"
+import (
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1184"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1186"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1188"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1190"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1191"
+)
+
+const Info = "{title:Kubernetes,version:v1.18.4},{title:Kubernetes,version:v1.18.6},{title:Kubernetes,version:v1.18.8},{title:Kubernetes,version:v1.19.0},{title:Kubernetes,version:v1.19.1}"
+
+var OpenApiMustAsset = map[string]func(string) []byte{
+	"v1184": v1184.MustAsset,
+	"v1186": v1186.MustAsset,
+	"v1188": v1188.MustAsset,
+	"v1190": v1190.MustAsset,
+	"v1191": v1191.MustAsset,
+}
+
+const DefaultOpenApi = "v1191"

kyaml/openapi/makeOpenApiInfoDotGo.sh

@@ -1,27 +0,0 @@
-#!/bin/bash
-# Copyright 2020 The Kubernetes Authors.
-# SPDX-License-Identifier: Apache-2.0
-
-set -e
-
-if ! command -v jq &> /dev/null ; then
-    echo Please install jq
-    echo on ubuntu: sudo apt-get install jq
-    exit 1
-fi
-
-OPEN_API_INFO=$(\
-    jq -r '.info' $1  | \
-    sed 's/[\" *]//g' | \
-    tr -d '\n' )
-
-cat <<EOF >kubernetesapi/openapiinfo.go
-// Copyright 2020 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-// Code generated by $0; DO NOT EDIT.
-
-package kubernetesapi
-
-const Info = "$OPEN_API_INFO"
-EOF

kyaml/openapi/openapi.go

@@ -395,9 +395,9 @@ func (rs *ResourceSchema) PatchStrategyAndKey() (string, string) {
 }
 
 const (
-	// kubernetesAPIAssetName is the name of the asset containing the statically compiled in
+	// kubernetesAPIDefaultVersion is the latest version number of the statically compiled in
-	// OpenAPI definitions for Kubernetes built-in types
+	// OpenAPI schema for kubernetes built-in types
-	kubernetesAPIAssetName = "kubernetesapi/swagger.json"
+	kubernetesAPIDefaultVersion = kubernetesapi.DefaultOpenApi
 
 	// kustomizationAPIAssetName is the name of the asset containing the statically compiled in
 	// OpenAPI definitions for Kustomization built-in types
@@ -436,7 +436,8 @@ func initSchema() {
 		}
 
 		// parse the swagger, this should never fail
-		if err := parse(kubernetesapi.MustAsset(kubernetesAPIAssetName)); err != nil {
+		assetName := "kubernetesapi/" + kubernetesAPIDefaultVersion + "/swagger.json"
+		if err := parse(kubernetesapi.OpenApiMustAsset[kubernetesAPIDefaultVersion](assetName)); err != nil {
 			// this should never happen
 			panic(err)
 		}

kyaml/openapi/scripts/fetchSchemaFromCluster.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Copyright 2020 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+MYGOBIN=$(go env GOPATH)/bin
+VERSION=$1
+
+cp $HOME/.kube/config /tmp/kubeconfig.txt | true
+$MYGOBIN/kind create cluster --image kindest/node:$VERSION --name=getopenapidata
+$MYGOBIN/kpt live  fetch-k8s-schema  --pretty-print > /tmp/new_swagger.json
+$MYGOBIN/kind delete cluster --name=getopenapidata
+cp /tmp/kubeconfig.txt $HOME/.kube/config | true
+mkdir -p kubernetesapi/"${VERSION//.}"
+cp /tmp/new_swagger.json kubernetesapi/"${VERSION//.}"/swagger.json

kyaml/openapi/scripts/generateSwaggerDotGo.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Copyright 2020 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+MYGOBIN=$(go env GOPATH)/bin
+VERSION=$1
+
+$MYGOBIN/go-bindata \
+  --pkg "${VERSION//.}" \
+  -o kubernetesapi/"${VERSION//.}"/swagger.go \
+  kubernetesapi/"${VERSION//.}"/swagger.json

kyaml/openapi/scripts/makeOpenApiInfoDotGo.sh

@@ -0,0 +1,84 @@
+#!/bin/bash
+# Copyright 2020 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+# This will read from the directory kubernetesapi
+# and use subdirectory names to generate
+# kubernetesapi/openapiinfo.go
+#
+# This script should only be run after the
+# swagger.json and swagger.go files are generated.
+
+set -e
+
+if ! command -v jq &> /dev/null ; then
+    echo Please install jq
+    echo on ubuntu: sudo apt-get install jq
+    exit 1
+fi
+
+info_list=()
+version_list=()
+
+V=`ls kubernetesapi | grep v.*`
+for VERSION in $V
+do
+  openapiinfo=$(\
+    jq -r '.info' kubernetesapi/$VERSION/swagger.json  | \
+    sed 's/[\" *]//g' | \
+    tr -d '\n' )
+  info_list+=( $openapiinfo )
+  version_list+=( ${VERSION} )
+done
+
+
+# add imports to openapiinfo.go
+cat <<EOF >kubernetesapi/openapiinfo.go
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Code generated by $0; DO NOT EDIT.
+
+package kubernetesapi
+
+import (
+EOF
+
+for version in ${version_list[@]}
+do
+  cat <<EOF >>kubernetesapi/openapiinfo.go
+  "sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/$version"
+EOF
+done
+
+# add info string for `kustomize openapi info` command
+OPEN_API_INFO=`echo ${info_list[@]} | tr " " ","`
+cat <<EOF >>kubernetesapi/openapiinfo.go
+)
+
+const Info = "$OPEN_API_INFO"
+EOF
+
+# add map for `initSchema` in openapi.go to use
+cat <<EOF >>kubernetesapi/openapiinfo.go
+
+var OpenApiMustAsset = map[string]func(string)[]byte{
+EOF
+
+latest=""
+for version in ${version_list[@]}
+do
+  latest=$version
+  cat <<EOF >>kubernetesapi/openapiinfo.go
+  "$version": $version.MustAsset,
+EOF
+done
+
+# add latest version to be used as a default
+cat <<EOF >>kubernetesapi/openapiinfo.go
+}
+
+const DefaultOpenApi = "$latest"
+EOF
+
+