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Added write up on how to create Kubernetes-style APIs
Signed-off-by: alejandrox1 <alarcj137@gmail.com>
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‎stories/kube-apis/README.md‎

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# Kubernetes-Style APIs
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Welcome to yet another adventure through the Kubernetes codebase.
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This time we will see how Kubernetes implements its APIs.
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You know all those pods, deployments, services, and all that that you used all
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the time?
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Well, the plan for today is to explore all the API machinery (ha!) that makes
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that possible.
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Kubernetes-style APIs are at their core a convination of Go `struct`s and some
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code generation to wrangle data into and out of said Go `struct`s.
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We will start this trip into kubenernetes by eploring the code generating tools
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that are currently used.
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## Deep Copy Generator
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We already hinted that the implementation of Kubernetes-style APIs relies on
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handling data and passing it into and out of Go `struct`s.
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If you have worked with multiple nested structs then you may have already ran
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into the problem of moving data from one struct into another.
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If the terms "shallow" and "deep" copy don't ring a bell then we recommend you
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give https://flaviocopes.com/go-copying-structs/ a quick read.
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In Kubernetes, we have a fancy tool called `deepcopy-gen` which does some code
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generation that results in `DeepCopy` methods.
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Like everything, hopefully an example will make it make more sense.
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`deepcopy-gen` can be found in staging,
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https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/code-generator/cmd/deepcopy-gen.
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For the sake of experimentation, we provide a small bash script,
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[build.sh](./build.sh) to get the `deepcopy-gen` binary.
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The build script will compile a binary for linux on amd64 but you can tweak it
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to cross-compile something else.
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This script is the simple version of
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https://github.com/kubernetes-sigs/kind/blob/edecdfee8878ac00c7ae00485fca3f95d351e1ac/hack/go_container.sh
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which is used in https://github.com/kubernetes-sigs/kind.
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Anyway, a
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```
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./build.sh go build k8s.io/code-generator/cmd/deepcopy-gen
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```
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will get you a `deepcopy-gen` in the current working directory.
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The entrypoint to `deepcopy-gen` is currently in
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https://github.com/kubernetes/gengo/blob/master/examples/deepcopy-gen/main.go
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There isn't a lot of documentation for `deepcopy-gen` but between
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https://github.com/kubernetes/gengo/blob/master/examples/deepcopy-gen/main.go
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and asking `deepcopy-gen` for help
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```
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./tools/deepcopy-gen --help
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```
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We should be able to get by.
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A couple details that we will need to explicitly mention are
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* `deepcopy-gen` relies on comments to know what types it should build deep
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copy methods for (we will show an example here shortly).
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```
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./tools/deepcopy-gen -i ./pkg O zz_generated.deepcopy --go-header-file boilerplate.go.txt
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```
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This will result in the creation of
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[pkg/deepcopy_generated.go](./pkg/deepcopy_generated.go), which we already
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included in here.
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And to test our deep copiers we included [main.go](./main.go).
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If you run it, you will see something like the following
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```
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$ go run main.go
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cluster1: &pkg.Cluster{Name:"kube", Nodes:[]string{"1", "2", "3"}}
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cluster2: &pkg.Cluster{Name:"kube", Nodes:[]string{"1", "2", "3"}}
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cluster3: &pkg.Cluster{Name:"", Nodes:[]string(nil)}
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cluster3: &pkg.Cluster{Name:"kube", Nodes:[]string{"1", "2", "3"}}
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cluster1 and cluster3 the same: false
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```
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and if you look at the code,
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```go
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c1 := &api.Cluster{Name: "kube", Nodes: []string{"1", "2", "3"}}
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...
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c2 := c1.DeepCopy()
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...
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c3 := &api.Cluster{}
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c2.DeepCopyInto(c3)
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...
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fmt.Printf("cluster1 and cluster3 the same: %v\n", c1 == c3)
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```
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we essentially create 1 `Cluster` object and then we use the generated
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`DeepCopy()` and `DeepCopyInto()` methods to create copies.
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The very last line compares if the first and last "cluster" objects are the
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same and we indeed find they aren't - which is good, because we want deep
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copies (we want the data alone.

‎stories/kube-apis/boilerplate.go.txt‎

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/*
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This is required for deepcopy-gen to work.
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This oilerplate will make a lot more sense in the context of Kubernetes, where
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all the source code must have a copyright message at the top.
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*/

‎stories/kube-apis/build.sh‎

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#!/bin/bash
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# Source directory, will be mounted to /src, defaults to ./tools.
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SOURCE_DIR="${SOURCE_DIR:-$(pwd -P)/tools}"
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docker run --rm \
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`# run as the user/group running this script` \
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--user "$(id -u):$(id -g)" \
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`# mount golang cache - required for 'go build'ing` \
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-v "${CACHE_VOLUME}:/go" -e XDG_CACHE_HOME=/go/cache \
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`# mount source directory` \
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-v "${SOURCE_DIR}:/src" \
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`# set environment variables to allow for cross-compilation (if desired)` \
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-e CGO_ENABLED=0 -e GOOS=linux -e GOARCH=amd64 \
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`# set working directory to the source directory` \
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-w "/src" \
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golang:1.14 "$@"

‎stories/kube-apis/go.mod‎

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module github.com/contributing-to-kubernetes/gnosis/stories/kube-apis
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go 1.14

‎stories/kube-apis/main.go‎

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package main
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import (
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"fmt"
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api "github.com/contributing-to-kubernetes/gnosis/stories/kube-apis/pkg"
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)
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func main() {
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c1 := &api.Cluster{Name: "kube", Nodes: []string{"1", "2", "3"}}
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fmt.Printf("cluster1: %#v\n", c1)
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c2 := c1.DeepCopy()
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fmt.Printf("cluster2: %#v\n", c2)
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c3 := &api.Cluster{}
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fmt.Printf("cluster3: %#v\n", c3)
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c2.DeepCopyInto(c3)
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fmt.Printf("cluster3: %#v\n", c3)
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fmt.Printf("cluster1 and cluster3 the same: %v\n", c1 == c3)
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}

‎stories/kube-apis/pkg/deepcopy_generated.go‎

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‎stories/kube-apis/pkg/doc.go‎

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// This package implements a sample apiVersion of the `Cluster` Config
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// along with some common abstractions.
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//
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// +k8s:deepcopy-gen=package
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package pkg

‎stories/kube-apis/pkg/types.go‎

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package pkg
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type Cluster struct {
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Name string
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Nodes []string
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}

‎stories/kube-apis/tools/go.mod‎

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module github.com/contributing-to-kubernetes/gnosis/stories/kube-apis/tools
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go 1.14
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require k8s.io/code-generator v0.18.6

‎stories/kube-apis/tools/go.sum‎

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github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
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github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
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github.com/emicklei/go-restful v2.9.5+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
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github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
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github.com/go-openapi/jsonpointer v0.0.0-20160704185906-46af16f9f7b1/go.mod h1:+35s3my2LFTysnkMfxsJBAMHj/DoqoB9knIWoYG/Vk0=
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github.com/go-openapi/jsonpointer v0.19.2/go.mod h1:3akKfEdA7DF1sugOqz1dVQHBcuDBPKZGEoHC/NkiQRg=
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golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20181011042414-1f849cf54d09/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20190614205625-5aca471b1d59/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
77+
golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72 h1:bw9doJza/SFBEweII/rHQh338oozWyiFsBRHtrflcws=
78+
golang.org/x/tools v0.0.0-20190920225731-5eefd052ad72/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
80+
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
81+
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
82+
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
84+
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
85+
k8s.io/code-generator v0.18.6 h1:QdfvGfs4gUCS1dru+rLbCKIFxYEV0IRfF8MXwY/ozLk=
86+
k8s.io/code-generator v0.18.6/go.mod h1:TgNEVx9hCyPGpdtCWA34olQYLkh3ok9ar7XfSsr8b6c=
87+
k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
88+
k8s.io/gengo v0.0.0-20200114144118-36b2048a9120 h1:RPscN6KhmG54S33L+lr3GS+oD1jmchIU0ll519K6FA4=
89+
k8s.io/gengo v0.0.0-20200114144118-36b2048a9120/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
90+
k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
91+
k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
92+
k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
93+
k8s.io/kube-openapi v0.0.0-20200410145947-61e04a5be9a6/go.mod h1:GRQhZsXIAJ1xR0C9bd8UpWHZ5plfAS9fzPjJuQ6JL3E=
94+
sigs.k8s.io/structured-merge-diff/v3 v3.0.0-20200116222232-67a7b8c61874/go.mod h1:PlARxl6Hbt/+BC80dRLi1qAmnMqwqDg62YvvVkZjemw=
95+
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
96+
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

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