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[kpt deployer] Customize the manipulated resource directory.
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* Add new config .kpt.fn.sinkDir
* Remove unnecessary tmp dir if user does not want to export the resource output.
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@yuwenma
yuwenma committed Sep 24, 2020
1 parent 65583f1 commit 8afed32
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Showing 4 changed files with 99 additions and 79 deletions.
8 changes: 7 additions & 1 deletion docs/content/en/schemas/v2beta8.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1768,6 +1768,11 @@
"type": "string",
"description": "docker network name to run the kpt function containers (default \"bridge\").",
"x-intellij-html-description": "docker network name to run the kpt function containers (default "bridge")."
},
"sinkDir": {
"type": "string",
"description": "directory to where the manipulated resource output is stored.",
"x-intellij-html-description": "directory to where the manipulated resource output is stored."
}
},
"preferredOrder": [
Expand All @@ -1776,7 +1781,8 @@
"networkName",
"globalScope",
"network",
"mount"
"mount",
"sinkDir"
],
"additionalProperties": false,
"description": "adds additional configurations used when calling `kpt fn`.",
Expand Down
71 changes: 41 additions & 30 deletions pkg/skaffold/deploy/kpt/kpt.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ import (
const (
inventoryTemplate = "inventory-template.yaml"
kptHydrated = ".kpt-hydrated"
pipeline = ".pipeline"
tmpSinkDir = ".tmp-sink-dir"
kptFnAnnotation = "config.kubernetes.io/function"
kptFnLocalConfig = "config.kubernetes.io/local-config"
)
Expand All @@ -72,7 +72,12 @@ func NewDeployer(cfg types.Config, labels map[string]string) *Deployer {
// outputs them to the applyDir, and runs `kpt live apply` against applyDir to create resources in the cluster.
// `kpt live apply` supports automated pruning declaratively via resources in the applyDir.
func (k *Deployer) Deploy(ctx context.Context, out io.Writer, builds []build.Artifact) ([]string, error) {
manifests, err := k.renderManifests(ctx, out, builds)
flags, err := k.getKptFnRunArgs()
if err != nil {
return []string{}, err
}

manifests, err := k.renderManifests(ctx, out, builds, flags)
if err != nil {
return nil, err
}
Expand All @@ -93,6 +98,12 @@ func (k *Deployer) Deploy(ctx context.Context, out io.Writer, builds []build.Art
}

manifest.Write(manifests.String(), filepath.Join(applyDir, "resources.yaml"), out)
// Hydrated config is stored in applyDir, no need to dup the config in temporary sink dir.
if k.Fn.SinkDir == tmpSinkDir {
if err := os.RemoveAll(tmpSinkDir); err != nil {
return nil, fmt.Errorf("deleting temporary directory %s: %w", k.Fn.SinkDir, err)
}
}

cmd := exec.CommandContext(ctx, "kpt", kptCommandArgs(applyDir, []string{"live", "apply"}, k.getKptLiveApplyArgs(), nil)...)
cmd.Stdout = out
Expand Down Expand Up @@ -149,7 +160,12 @@ func (k *Deployer) Cleanup(ctx context.Context, out io.Writer) error {

// Render hydrates manifests using both kustomization and kpt functions.
func (k *Deployer) Render(ctx context.Context, out io.Writer, builds []build.Artifact, _ bool, filepath string) error {
manifests, err := k.renderManifests(ctx, out, builds)
flags, err := k.getKptFnRunArgs()
if err != nil {
return err
}

manifests, err := k.renderManifests(ctx, out, builds, flags)
if err != nil {
return err
}
Expand All @@ -160,21 +176,21 @@ func (k *Deployer) Render(ctx context.Context, out io.Writer, builds []build.Art
// renderManifests handles a majority of the hydration process for manifests.
// This involves reading configs from a source directory, running kustomize build, running kpt pipelines,
// adding image digests, and adding run-id labels.
func (k *Deployer) renderManifests(ctx context.Context, _ io.Writer, builds []build.Artifact) (manifest.ManifestList, error) {
func (k *Deployer) renderManifests(ctx context.Context, _ io.Writer, builds []build.Artifact,
flags []string) (manifest.ManifestList, error) {
debugHelpersRegistry, err := config.GetDebugHelpersRegistry(k.globalConfig)
if err != nil {
return nil, fmt.Errorf("retrieving debug helpers registry: %w", err)
}
if k.Fn.SinkDir == "" {
k.Fn.SinkDir = tmpSinkDir
}

// .pipeline is a temp dir used to store output between steps of the desired workflow
// This can be removed once kpt can fully support the desired workflow independently.
if err := os.RemoveAll(filepath.Join(pipeline, k.Dir)); err != nil {
return nil, fmt.Errorf("deleting temporary directory %s: %w", filepath.Join(pipeline, k.Dir), err)
if err := os.RemoveAll(filepath.Join(k.Fn.SinkDir, k.Dir)); err != nil {
return nil, fmt.Errorf("deleting temporary directory %s: %w", filepath.Join(k.Fn.SinkDir, k.Dir), err)
}
// 0755 is a permission setting where the owner can read, write, and execute.
// Others can read and execute but not modify the directory.
if err := os.MkdirAll(filepath.Join(pipeline, k.Dir), 0755); err != nil {
return nil, fmt.Errorf("creating temporary directory %s: %w", filepath.Join(pipeline, k.Dir), err)
if err := os.MkdirAll(filepath.Join(k.Fn.SinkDir, k.Dir), os.ModePerm); err != nil {
return nil, fmt.Errorf("creating temporary directory %s: %w", filepath.Join(k.Fn.SinkDir, k.Dir), err)
}

if err := k.readConfigs(ctx); err != nil {
Expand All @@ -185,7 +201,7 @@ func (k *Deployer) renderManifests(ctx context.Context, _ io.Writer, builds []bu
return nil, fmt.Errorf("kustomize build: %w", err)
}

manifests, err := k.kptFnRun(ctx)
manifests, err := k.kptFnRun(ctx, flags)
if err != nil {
return nil, fmt.Errorf("running kpt functions: %w", err)
}
Expand Down Expand Up @@ -213,15 +229,15 @@ func (k *Deployer) renderManifests(ctx context.Context, _ io.Writer, builds []bu
}

// readConfigs uses `kpt fn source` to read config manifests from k.Dir
// and uses `kpt fn sink` to output those manifests to .pipeline.
// and uses `kpt fn sink` to output those manifests to sinkDir.
func (k *Deployer) readConfigs(ctx context.Context) error {
cmd := exec.CommandContext(ctx, "kpt", kptCommandArgs(k.Dir, []string{"fn", "source"}, nil, nil)...)
b, err := util.RunCmdOut(cmd)
if err != nil {
return err
}

cmd = exec.CommandContext(ctx, "kpt", kptCommandArgs(filepath.Join(pipeline, k.Dir), []string{"fn", "sink"}, nil, nil)...)
cmd = exec.CommandContext(ctx, "kpt", kptCommandArgs(filepath.Join(k.Fn.SinkDir, k.Dir), []string{"fn", "sink"}, nil, nil)...)
cmd.Stdin = bytes.NewBuffer(b)
if _, err := util.RunCmdOut(cmd); err != nil {
return err
Expand All @@ -237,7 +253,8 @@ func (k *Deployer) kustomizeBuild(ctx context.Context) error {
return nil
}

cmd := exec.CommandContext(ctx, "kustomize", append([]string{"build"}, kustomize.BuildCommandArgs([]string{"-o", filepath.Join(pipeline, k.Dir)}, k.Dir)...)...)
cmd := exec.CommandContext(ctx, "kustomize", append([]string{"build"},
kustomize.BuildCommandArgs([]string{"-o", filepath.Join(k.Fn.SinkDir, k.Dir)}, k.Dir)...)...)
if _, err := util.RunCmdOut(cmd); err != nil {
return err
}
Expand All @@ -247,28 +264,22 @@ func (k *Deployer) kustomizeBuild(ctx context.Context) error {
return fmt.Errorf("finding kustomization dependencies: %w", err)
}

// Kustomize build outputs hydrated configs to .pipeline, so the dry configs must be removed.
// Kustomize build outputs hydrated configs to sinkDir, so the dry configs must be removed.
for _, v := range deps {
if err := os.RemoveAll(filepath.Join(pipeline, v)); err != nil {
if err := os.RemoveAll(filepath.Join(k.Fn.SinkDir, v)); err != nil {
return err
}
}

return nil
}

// kptFnRun does a dry run with the specified kpt functions (fn-path XOR image) against .pipeline.
// If neither fn-path nor image are specified, functions will attempt to be discovered in .pipeline.
// kptFnRun does a dry run with the specified kpt functions (fn-path XOR image) against sinkDir.
// If neither fn-path nor image are specified, functions will attempt to be discovered in sinkDir.
// An error occurs if both fn-path and image are specified.
func (k *Deployer) kptFnRun(ctx context.Context) (manifest.ManifestList, error) {
func (k *Deployer) kptFnRun(ctx context.Context, flags []string) (manifest.ManifestList, error) {
var manifests manifest.ManifestList

flags, err := k.getKptFnRunArgs()
if err != nil {
return nil, fmt.Errorf("getting kpt fn run args: %w", err)
}

cmd := exec.CommandContext(ctx, "kpt", kptCommandArgs(pipeline, []string{"fn", "run"}, flags, nil)...)
cmd := exec.CommandContext(ctx, "kpt", kptCommandArgs(k.Fn.SinkDir, []string{"fn", "run"}, flags, nil)...)
out, err := util.RunCmdOut(cmd)
if err != nil {
return nil, err
Expand All @@ -282,7 +293,7 @@ func (k *Deployer) kptFnRun(ctx context.Context) (manifest.ManifestList, error)
}

// excludeKptFn adds an annotation "config.kubernetes.io/local-config: 'true'" to kpt function.
// This will exclude kpt functions from deployed to the cluster in kpt live apply.
// This will exclude kpt functions from deployed to the cluster in `kpt live apply`.
func (k *Deployer) excludeKptFn(originalManifest manifest.ManifestList) (manifest.ManifestList, error) {
var newManifest manifest.ManifestList
for _, yByte := range originalManifest {
Expand Down Expand Up @@ -332,7 +343,7 @@ func (k *Deployer) getApplyDir(ctx context.Context) (string, error) {

// 0755 is a permission setting where the owner can read, write, and execute.
// Others can read and execute but not modify the directory.
if err := os.MkdirAll(kptHydrated, 0755); err != nil {
if err := os.MkdirAll(kptHydrated, os.ModePerm); err != nil {
return "", fmt.Errorf("applyDir was unspecified. creating applyDir: %w", err)
}

Expand Down
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