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https://github.com/kubernetes-sigs/kustomize.git
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939de0cdbe
This PR:
* provides a code generator that converts
kustomize Go plugins to normal code, i.e.
the plugin appears as
t := builtin.NewImageTagTransformer()
instead of
p := plugin.Open("imagetagtransformer.so")
s := p.Lookup(someSymbol)
t, ok = s.(Transformer)
* converts the main processing thread in
kusttarget.go to use those factory calls to run
builtin generators and transformer before
calling user-supplied plugins,
* as an example, provides an imagetag transformer
plugin, converting a legacy transformer to
builtin plugin form with its own isolated test.
This test can be expanded by moving more code
into it, but that can be done in a later PR.
Writing core functionality as plugins assures a
maintained plugin authoring and testing framework,
assures modularity, provides meaningful plugin
examples, and gives us a means to make informed
choices on which kustomize packages to publish
(and which to move to internal/). The code
generator allows all this without losing "go get
sigs.k8s.io/kustomize" functionality.
TODO:
1) Convert remaining legacy transformers to
plugins (patch SMP/JSON, name prefix/suffix,
labels/annos) with their own tests. The
generators are already done; this PR wires
them up, and all tests & examples pass.
2) Push code down into the plugins, as the first
pass at conversion writes plugins as thin
layers over calls into code under the mess
that is pkg/. Once this is done, we can
reasonably move all the packages that aren't
imported by plugins to internal/.
This PR could be split in two, one to merge the
the generator, and the second to merge the
ImageTagTransformer plugin and its wiring into the
main flow.
The latter PR could then serve as an example for
converting the remaining transformers.
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
// +build plugin
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/*
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Copyright 2019 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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//go:generate go run sigs.k8s.io/kustomize/cmd/pluginator
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package main
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import (
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"sigs.k8s.io/kustomize/pkg/ifc"
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"sigs.k8s.io/kustomize/pkg/resmap"
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"sigs.k8s.io/kustomize/pkg/types"
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"sigs.k8s.io/yaml"
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)
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type plugin struct {
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ldr ifc.Loader
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rf *resmap.Factory
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types.GeneratorOptions
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types.ConfigMapArgs
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}
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var KustomizePlugin plugin
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func (p *plugin) Config(
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ldr ifc.Loader, rf *resmap.Factory, config []byte) (err error) {
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p.GeneratorOptions = types.GeneratorOptions{}
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p.ConfigMapArgs = types.ConfigMapArgs{}
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err = yaml.Unmarshal(config, p)
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p.ldr = ldr
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p.rf = rf
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return
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}
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func (p *plugin) Generate() (resmap.ResMap, error) {
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argsList := make([]types.ConfigMapArgs, 1)
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argsList[0] = p.ConfigMapArgs
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return p.rf.NewResMapFromConfigMapArgs(
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p.ldr, &p.GeneratorOptions, argsList)
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}
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