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77 lines
2.7 KiB
Go
77 lines
2.7 KiB
Go
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// It's possible that kustomize's features will be vendored into
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// the kubernetes/kubernetes repo and made available to kubectl
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// commands, while at the same time the kustomize program will
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// continue to exist as an independent CLI. Vendoring snapshots
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// would be taken just before a kubectl release.
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//
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// This creates a problem in that freestanding-kustomize depends on
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// (for example):
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//
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// https://github.com/kubernetes/apimachinery/
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// tree/master/pkg/util/yaml
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//
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// It vendors that package into
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// sigs.k8s.io/kustomize/vendor/k8s.io/apimachinery/
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//
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// Whereas kubectl-kustomize would have to depend on the "staging"
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// version of this code, located at
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//
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// https://github.com/kubernetes/kubernetes/
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// blob/master/staging/src/k8s.io/apimachinery/pkg/util/yaml
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//
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// which is "vendored" via symlinks:
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// k8s.io/kubernetes/vendor/k8s.io/apimachinery
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// is a symlink to
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// ../../staging/src/k8s.io/apimachinery
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//
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// The staging version is the canonical, under-development
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// version of the code that kubectl depends on, whereas the packages
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// at kubernetes/apimachinery are periodic snapshots of staging made
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// for outside tools to depend on.
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//
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// apimachinery isn't the only package that poses this problem, just
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// using it as a specific example.
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//
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// The kubectl binary cannot vendor in kustomize code that in
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// turn vendors in the non-staging packages.
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//
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// One way to fix some of this would be to copy code - a hard fork.
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// This has all the problems associated with a hard forking.
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//
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// Another way would be to break the kustomize repo into three:
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//
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// (1) kustomize - repo with the main() function,
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// vendoring (2) and (3).
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//
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// (2) kustomize-libs - packages used by (1) with no
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// apimachinery dependence.
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//
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// (3) kustomize-k8sdeps - A thin code layer that depends
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// on (vendors) apimachinery to provide thin implementations
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// to interfaces used in (2).
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//
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// The kubectl repo would then vendor from (2) only, and have
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// a local implementation of (3). With that in mind, it's clear
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// that (3) doesn't have to be a repo; the kustomize version of
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// the thin layer can live directly in (1).
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//
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// This package is the code in (3), meant for kustomize.
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package k8sdeps
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