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Merge pull request #2136 from yujunz/docs/how

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Add document about how `kustomize build` works
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Kubernetes Prow Robot
2020-01-28 09:25:42 -08:00
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# How does `kustomize build` work
Call stack when running `kustomize build`, with links to code.
## Run build
* [RunBuild](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/kustomize/internal/commands/build/build.go#L121)
* [MakeKustomizer](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/krusty/kustomizer.go#L32)
* [Run](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/krusty/kustomizer.go#L47): performs a kustomization. It uses its internal filesystem reference to read the file at the given path argument, interpret it as a kustomization.yaml file, perform the kustomization it represents, and return the resulting resources.
* Create factories
* [tranformer.NewFactoryImpl](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/k8sdeps/transformer/factory.go#L17)
* [resmap.NewFactory](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/resmap/factory.go#L21)
* [resource.NewFactory](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/resource/factory.go#L23)
* [kustruct.NewKunstructuredFactoryImpl](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/k8sdeps/kunstruct/factory.go#L28)
* [loader.NewLoader](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/loader/loader.go#L19)
* [validator.NewKustValidator](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/k8sdeps/validator/validators.go#L23)
* [NewKustTarget](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L38)
* [Load](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L54)
* [MakeCustomizeResMap](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L109): details in next section
* [emitResources](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/kustomize/internal/commands/build/build.go#L143)
## Make resource map
* [makeCustomizeResMap](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L117)
* [AccumulateTarget](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L196): returns a new ResAccumulator, holding customized resources and the data/rules used to do so. The name back references and vars are not yet fixed.
* [accummulateResources](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L302): fills the given resourceAccumulator with resources read from the given list of paths.
* Merge config from builtin and CRDs
* [runGenerators](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L239)
* [configureBuiltinGenerators](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget_configplugin.go#L28)
* ConfigMapGenerator
* SecretGenerator
* [configureExternalGenerators]()
* Iterate all generators
* [runTransfomers](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L274)
* [configureBuiltinTransformers](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget_configplugin.go#L44)
* PatchStrategicMergeTransformer
* PatchTransformer
* NamespaceTransformer
* PrefixSuffixTransformer
* LabelTransformer
* AnnotationsTransformer
* PatchJson6902Transformer
* ReplicaCountTransformer
* ImageTagTransformer
* [configureExternalTransformers](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L291)
* [MergeVars](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/accumulator/resaccumulator.go#L64)
* The following steps must be done last, not as part of the recursion implicit in AccumulateTarget.
* [addHashesToNames](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L153)
* [FixBackReferences](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/accumulator/resaccumulator.go#L160): Given that names have changed (prefixs/suffixes added), fix all the back references to those names.
* [ResolveVars](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/accumulator/resaccumulator.go#L141)
* [computeInventory](https://github.com/kubernetes-sigs/kustomize/blob/c7d78970fb86782dbdded3a93944b774f826071f/api/internal/target/kusttarget.go#L163)