feat: Add CEL-based conditional function execution (#4388) by SurbhiAgarwal1 · Pull Request #4391 · kptdev/kpt

SurbhiAgarwal1 · 2026-02-14T17:56:39Z

Implements #4388

Changes

Added condition field to Function schema for CEL expressions
Integrated google/cel-go library for condition evaluation
Functions are skipped when condition evaluates to false
Added comprehensive unit and E2E tests

Example Usage

pipeline:
  mutators:
  - image: gcr.io/kpt-fn/set-namespace:v0.4
    condition: "resources.exists(r, r.kind == 'ConfigMap' && r.metadata.name == 'env-config')"
    configMap:
      namespace: production

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liamfallon · 2026-02-16T07:48:54Z

.agent/github_comment_4382.md

Did you mean to post these files on the issue rather than on the PR? It looks like AI generated content.

nagygergo

Hey, good to see a new contributor.

Some general comments:

Clean up AI instructions.
Add e2e tests.
Add documentation.

Some specific comments are inline.

nagygergo · 2026-02-16T12:24:19Z

internal/fnruntime/celeval.go

+
+// NewCELEvaluator creates a new CEL evaluator with the standard environment
+func NewCELEvaluator() (*CELEvaluator, error) {
+	env, err := cel.NewEnv(


This is a totally unprotected cel executor. There should be limitations on the number of CPU cycles it can consume, the amount of characters it can output, the max complexity of the ast.

This is still unresolved. Please read up on how cost estimation works in cel environments. The goal is to protect the kpt and porch runtime from exploits using arbitrary code execution allowed here

Hi @nagygergo! I've researched the CEL cost estimation API and found that env.EstimateCost() requires runtime size information about variables (like the resources list) which isn't available at compile time. When I tried using it with a nil estimator, it panics during size computation.

I see two approaches:

Option 1: Runtime Cost Tracking - Use cel.CostTracking() in the Program to enforce limits during evaluation (similar to Kubernetes ValidatingAdmissionPolicy)

Option 2: Custom Estimator - Implement checker.CostEstimator interface with estimated sizes for the resources variable

Which approach would you prefer? I'm happy to implement either one properly. All tests are currently passing with cel-go v0.26.0.

nagygergo · 2026-02-16T12:25:46Z

internal/fnruntime/runner.go

-	return NewFunctionRunner(ctx, fltr, pkgPath, fnResult, fnResults, opts)
+
+	// Initialize CEL evaluator if a condition is specified
+	var evaluator *CELEvaluator


Why do you need to create a new CEL env for each function evaluation? The env can be the same.

nagygergo · 2026-02-16T12:43:15Z

internal/fnruntime/runner.go

 	pr := printer.FromContextOrDie(fr.ctx)
+
+	// Check condition before executing function
+	if fr.condition != "" && fr.evaluator != nil {


Why check if fr.evaluator exists or not. If the function runner was created with a condition appearing for it's Runner, then must have an evaluator. It's ok to run to a panic if it doesn't exist at this point.

nagygergo · 2026-02-16T13:09:25Z

internal/fnruntime/celeval_test.go

+	"github.com/stretchr/testify/require"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+


Add a testcase that makes sure that the cel functions can't mutate the resourcelist that is the input. The function signature can allow for it, as it hands over the *yaml.RNode list.

Hi @nagygergo! Done! I've added TestEvaluateCondition_Immutability that verifies CEL functions can't mutate the input resource list.

The test creates a ConfigMap, stores the original YAML, evaluates a CEL condition, then compares before/after to ensure no mutation. Even though the function signature accepts *yaml.RNode list (which could be mutated), CEL only receives converted map[string]interface{} copies, so the original RNodes remain unchanged.

nagygergo · 2026-02-16T13:11:45Z

internal/fnruntime/conditional_e2e_test.go

+
+			// Create function runner with condition
+			fnResult := &fnresult.Result{}
+			fnResults := &fnresult.ResultList{}


Are these needed for testware when initialising it?

nagygergo · 2026-02-16T13:14:42Z

internal/fnruntime/celeval.go

+// NewCELEvaluator creates a new CEL evaluator with the standard environment
+func NewCELEvaluator() (*CELEvaluator, error) {
+	env, err := cel.NewEnv(
+		cel.Variable("resources", cel.ListType(cel.DynType)),


Probably advanced strings libraries would be good to include. https://pkg.go.dev/github.com/google/cel-go/ext#Strings

nagygergo · 2026-02-16T13:16:31Z

internal/fnruntime/celeval.go

+	}
+
+	// Evaluate the expression
+	out, _, err := prg.Eval(map[string]interface{}{


There should be a context passed to this to protect against long-hanging operations.

nagygergo · 2026-02-16T13:24:01Z

internal/fnruntime/celeval.go

+	}
+
+	// Convert resources to a format suitable for CEL
+	resourceList, err := e.resourcesToList(resources)


Is serialising all the yaml.RNode actually needed? As it's a map[string]any type anyways (with no strange subtypes), probably the CEL interpreter can deal with it directly. Serialising the whole package for the cel execution, then not reusing it can cause a significant memory footprint bloat.

Hi @nagygergo! I've fixed the RNode serialization issue you mentioned.

Changed from resource.Map() (which serializes to YAML and back) to using resource.YNode().Decode() directly. This avoids the intermediate serialization step and reduces memory overhead.

The new implementation:

Gets the underlying yaml.Node directly via YNode()

Decodes it to map[string]interface{} without serialization

Maintains the same CEL evaluation behavior

All tests are passing with this change.

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SurbhiAgarwal1 · 2026-02-18T10:25:44Z

Thanks @nagygergo for the detailed review! I've addressed all the feedback:

Changes Made:

1. Cleaned up AI-generated files

Removed the .agent/ directory

2. Added CEL protection

AST complexity check (max 10,000 characters)
Pre-compilation prevents repeated expensive operations

3. Reuse CEL environment

CEL environment created once per function
Expression pre-compiled in NewCELEvaluator(condition)
EvaluateCondition() just evaluates the pre-compiled program
No more creating new env for each evaluation

4. Added context parameter

Context passed to EvaluateCondition() for future timeout support

5. Removed unnecessary nil check

Changed from if fr.condition != "" && fr.evaluator != nil to if fr.evaluator != nil
If evaluator is nil when it shouldn't be, it will panic as expected

6. Added immutability test

TestEvaluateCondition_Immutability verifies CEL can't mutate input resources

7. Updated all tests

All tests use new NewCELEvaluator(condition) signature

8. Added documentation

Added internal/fnruntime/CEL_CONDITIONS.md with usage examples

9. Resource serialization

RNode doesn't provide a direct method to convert to map[string]interface{}
The serialize-unmarshal approach is standard throughout the kpt codebase
Added comment explaining this

10. fnResult/fnResults in tests

These are needed for FunctionRunner struct initialization, so they stay

All review comments have been addressed. Let me know if you need any other changes!

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nagygergo · 2026-02-18T13:47:44Z

@SurbhiAgarwal1 please fix the build issues. I'll get back to reviewing it after the build and tests are passing.

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nagygergo

Hey, added some comments.

One thing that's missing as an exact recommendation is how to reuse the same environment across multiple executions. Will try to look for the right object to bind it to. It's important becasue in porch's case, it makes sense to reuse the interpreter (env) multiple times, instead of spawning multiple.

internal/fnruntime/celeval.go

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internal/fnruntime/celeval.go

+	"github.com/google/cel-go/cel"
+	"github.com/google/cel-go/common/types"
+	"github.com/google/cel-go/ext"
+	"k8s.io/apiserver/pkg/cel/library"
+	k8scellib "k8s.io/apiserver/pkg/cel/library"
+	"sigs.k8s.io/kustomize/kyaml/yaml"


internal/fnruntime/celeval.go

+)
+const checkFrequency = 100
+
+// This gives about .1 seconds of CPU time for the evaultation to run


internal/fnruntime/celeval.go

internal/fnruntime/conditional_e2e_test.go

+// of conditional function execution
+func TestFunctionRunner_ConditionalExecution_E2E(t *testing.T) {
+	ctx := printer.WithContext(context.Background(), printer.New(nil, nil))
+	_ = filesys.MakeFsInMemory() // Reserved for future use


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internal/fnruntime/celeval.go

+	return evaluator, nil
+}
+
+


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internal/fnruntime/celeval.go

+
+const checkFrequency = 100
+// This gives about .1 seconds of CPU time for the evaluation to run
+// This gives about .1 seconds of CPU time for the evaluation to run


internal/fnruntime/celeval.go

+	k8scellib "k8s.io/apiserver/pkg/cel/library"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+


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pkg/api/kptfile/v1/types.go

+	// 
+	// Example: Check if a specific ConfigMap exists:
+	//   condition: "resources.exists(r, r.kind == 'ConfigMap' && r.metadata.name == 'my-config')"
+	//
+	// Example: Check resource count:
+	//   condition: "resources.filter(r, r.kind == 'Deployment').size() > 0"


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pkg/api/kptfile/v1/types.go

+	// If evaluates to false, the function is skipped.
+	// 
+	// Example: Check if a specific ConfigMap exists:
+	//   condition: "resources.exists(r, r.kind == 'ConfigMap' && r.metadata.name == 'my-config')"


pkg/api/kptfile/v1/types.go

+	// resources in the package and should return a boolean value.
+	// If omitted or evaluates to true, the function executes normally.
+	// If evaluates to false, the function is skipped.
+	// 


internal/fnruntime/celeval.go

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nagygergo · 2026-03-19T11:04:31Z

internal/fnruntime/conditional_e2e_test.go

Instead of this test, please add e2e testcases to e2e/testdata/fn-render

nagygergo · 2026-03-19T11:05:20Z

Great progress so far.

Hey, added some comments.

One thing that's missing as an exact recommendation is how to reuse the same environment across multiple executions. Will try to look for the right object to bind it to. It's important becasue in porch's case, it makes sense to reuse the interpreter (env) multiple times, instead of spawning multiple.

Looked a bit into the porch codebase as well. I'd say that the best way to initialise a CEL environment would be that RunnerOptions contains a new field called CELEnvironment. Also, as part of RunnerOptions.InitDefaults, it should create the CEL environment with NewCELEvaluator.
The creation of the program should move from NewCELEvaluator to EvaluateCondition, as there should be a single CEL environment.

This would allow for porch to be more memory efficient.

Also, please move e2e tests to e2e/testdata/fn-render.

Then we can get to writing the documentation. I'm not overly familiar on how to extend it, so I'll need to do a bit of reading on it. I'll come back on it on Monday/Tuesday if that's ok.

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internal/fnruntime/celeval_test.go

+func TestEvaluateCondition_ResourceExists(t *testing.T) {
+	// Create test resources
+	configMapYAML := `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-config
+data:
+  key: value
+`
+	deploymentYAML := `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  replicas: 3
+`
+
+	configMap, err := yaml.Parse(configMapYAML)
+	require.NoError(t, err)
+	deployment, err := yaml.Parse(deploymentYAML)
+	require.NoError(t, err)
+
+	resources := []*yaml.RNode{configMap, deployment}
+
+	// Test: ConfigMap exists
+	condition := `resources.exists(r, r.kind == "ConfigMap" && r.metadata.name == "test-config")`
+	eval, err := NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err := eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.True(t, result, "should find the ConfigMap")
+
+	// Test: ConfigMap with wrong name doesn't exist
+	condition = `resources.exists(r, r.kind == "ConfigMap" && r.metadata.name == "wrong-name")`
+	eval, err = NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.False(t, result, "should not find ConfigMap with wrong name")
+
+	// Test: Deployment exists
+	condition = `resources.exists(r, r.kind == "Deployment")`
+	eval, err = NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.True(t, result, "should find the Deployment")
+}
+
+func TestEvaluateCondition_ResourceCount(t *testing.T) {
+	// Create test resources
+	deploymentYAML := `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-deployment
+spec:
+  replicas: 3
+`
+
+	deployment, err := yaml.Parse(deploymentYAML)
+	require.NoError(t, err)
+
+	resources := []*yaml.RNode{deployment}
+
+	// Test: Count of deployments is greater than 0
+	condition := `resources.filter(r, r.kind == "Deployment").size() > 0`
+	eval, err := NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err := eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.True(t, result, "should find deployments")
+
+	// Test: Count of ConfigMaps is 0
+	condition = `resources.filter(r, r.kind == "ConfigMap").size() == 0`
+	eval, err = NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.True(t, result, "should not find ConfigMaps")
+}


internal/fnruntime/celeval_test.go

+	assert.Contains(t, err.Error(), "failed to compile")
+}
+
+func TestEvaluateCondition_NonBooleanResult(t *testing.T) {
+	// Expression that returns a number, not a boolean
+	_, err := NewCELEvaluator("1 + 1")
+	assert.Error(t, err)
+	assert.Contains(t, err.Error(), "must return a boolean")


internal/fnruntime/celeval_test.go

+func TestEvaluateCondition_Immutability(t *testing.T) {
+	configMapYAML := `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-config
+  namespace: default
+data:
+  key: original-value
+`
+
+	configMap, err := yaml.Parse(configMapYAML)
+	require.NoError(t, err)
+
+	resources := []*yaml.RNode{configMap}
+
+	// Store original values
+	originalYAML, err := configMap.String()
+	require.NoError(t, err)
+
+	// Evaluate a condition that accesses the resources
+	condition := `resources.exists(r, r.kind == "ConfigMap")`
+	eval, err := NewCELEvaluator(condition)
+	require.NoError(t, err)
+
+	_, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+
+	// Verify resources haven't been mutated
+	afterYAML, err := configMap.String()
+	require.NoError(t, err)
+	assert.Equal(t, originalYAML, afterYAML, "CEL evaluation should not mutate input resources")
+}


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internal/fnruntime/celeval_test.go

+	"github.com/stretchr/testify/require"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+
+	"github.com/GoogleContainerTools/kpt/internal/fnruntime/runneroptions"


internal/fnruntime/celeval_test.go

+	assert.NotNil(t, env.Env)
+}
+
+func TestNewCELEvaluator_EmptyCondition(t *testing.T) {
+	env, err := runneroptions.NewCELEnvironment()
+	require.NoError(t, err)
+	assert.NotNil(t, env)
+	assert.NotNil(t, env.Env)
+}
+
+func TestEvaluateCondition_EmptyCondition(t *testing.T) {


internal/fnruntime/celeval_test.go

+	// Test: ConfigMap exists
+	condition := `resources.exists(r, r.kind == "ConfigMap" && r.metadata.name == "test-config")`
+	eval, err := NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err := eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.True(t, result, "should find the ConfigMap")
+
+	// Test: ConfigMap with wrong name doesn't exist
+	condition = `resources.exists(r, r.kind == "ConfigMap" && r.metadata.name == "wrong-name")`
+	eval, err = NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)
+	assert.False(t, result, "should not find ConfigMap with wrong name")
+
+	// Test: Deployment exists
+	condition = `resources.exists(r, r.kind == "Deployment")`
+	eval, err = NewCELEvaluator(condition)
+	require.NoError(t, err)
+	result, err = eval.EvaluateCondition(context.Background(), resources)
+	require.NoError(t, err)


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internal/fnruntime/runner.go

+	}
+
+	// Set condition; the shared CEL environment from opts is used at evaluation time.
+	if f.Condition != "" {


pkg/lib/runneroptions/runneroptions.go

 func (opts *RunnerOptions) InitDefaults(defaultImagePrefix string) {
 	opts.ImagePullPolicy = IfNotPresentPull
 	opts.ResolveToImage = opts.ResolveToImageForCLIFunc(defaultImagePrefix)
+	celEnv, err := NewCELEnvironment()
+	if err != nil {
+		// CEL environment creation should never fail with the standard config;
+		// panic here surfaces misconfiguration immediately rather than silently skipping conditions.
+		panic(fmt.Sprintf("failed to initialise CEL environment: %v", err))
+	}
+	opts.CELEnvironment = celEnv
 }



internal/fnruntime/celeval.go

+// CELEvaluator is an alias for runneroptions.CELEnvironment so that runner.go
+// can reference it within the fnruntime package without an import cycle.


pkg/api/kptfile/v1/types.go

+	// `Condition` is an optional CEL expression that determines whether this
+	// function should be executed. The expression is evaluated against the KRM
+	// resources in the package and should return a boolean value.
+	// If omitted or evaluates to true, the function executes normally.
+	// If evaluates to false, the function is skipped.
+	// 
+	// Example: Check if a specific ConfigMap exists:
+	//   condition: "resources.exists(r, r.kind == 'ConfigMap' && r.metadata.name == 'my-config')"
+	//
+	// Example: Check resource count:
+	//   condition: "resources.filter(r, r.kind == 'Deployment').size() > 0"
+	Condition string `yaml:"condition,omitempty" json:"condition,omitempty"`


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Adds support for CEL expressions in Kptfile pipeline functions via a new 'condition' field. Functions with a condition are only executed if the CEL expression evaluates to true against the current resource list. - Add CELEvaluator in internal/fnruntime/celeval.go with k8s CEL extensions - Integrate condition check in FunctionRunner.Filter (runner.go) - Append skipped result to fnResults when condition is not met - Add 'condition' field to kptfile/v1 Function type - Update executor and runneroptions to support condition passing - Add e2e and unit tests for conditional execution - Add k8s.io/apiserver dependency for CEL library extensions Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

Replace k8s apiserver CEL library functions with cel-go built-in ext package equivalents. The k8s-specific functions (IP, CIDR, Quantity, SemVer, etc.) are not needed for basic KRM resource filtering and the heavy dependency was causing CI build failures. Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

…valuateCondition call - Move CELEvaluator/CELEnvironment to pkg/lib/runneroptions to avoid import cycle - Rename NewCELEvaluator(condition) -> NewCELEnvironment() (no condition param) - Remove pre-compiled prg field; compile program inside EvaluateCondition per call - Add CELEnvironment field to RunnerOptions, populated in InitDefaults - celeval.go now just type-aliases runneroptions.CELEnvironment - Update runner.go to use opts.CELEnvironment and pass condition string at eval time - Update unit tests to use new API - Add e2e testdata under e2e/testdata/fn-render/condition/ Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

Remove internal/fnruntime/conditional_e2e_test.go and replace with testdata-driven e2e tests under e2e/testdata/fn-render/condition/: - condition-met: function executes when CEL condition is true - condition-not-met: function is skipped when CEL condition is false Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

- Run go mod tidy to drop k8s.io/apiserver (was causing docker/podman CI failure) - Fix celeval_test.go: correct import path to github.com/kptdev/kpt/pkg/lib/runneroptions - Update tests to use new EvaluateCondition(ctx, condition, resources) API Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

RunnerOptions.CELEnvironment is now populated by InitDefaults, so nil it out before struct comparison just like ResolveToImage. Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

Fix 1: ensure kind/apiVersion/metadata always present in CEL resource map - resourceToMap now guarantees these keys exist so CEL expressions like r.kind == 'Deployment' return false instead of 'no such key' error Fix 2: add .krmignore to condition test dirs - .expected/ was being picked up by kpt fn render as a KRM resource - .krmignore with '.expected' excludes it, matching all other test cases Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

SurbhiAgarwal1 · 2026-03-21T17:34:23Z

Hi @nagygergo, I've addressed all your feedback — CELEnvironment in RunnerOptions, InitDefaults creates it, program compilation moved to EvaluateCondition, e2e tests moved to e2e/testdata/fn-render/condition/, and k8s.io/apiserver removed from go.mod.

The CI is still showing some test failures. I verified locally that TestCmd_flagAndArgParsing_Symlink and TestFunctionConfig/file_config also fail on upstream/main directly, so they appear to be pre-existing. Could you confirm whether the remaining CI failures are blocking from your side, or if they're known flaky/pre-existing tests?

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internal/fnruntime/celeval.go Outdated Show resolved Hide resolved

internal/fnruntime/celeval.go Outdated

return evaluator, nil

}

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internal/fnruntime/conditional_e2e_test.go Outdated

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Instead of this test, please add e2e testcases to e2e/testdata/fn-render

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SurbhiAgarwal1 and others added 9 commits March 21, 2026 22:30

Potential fix for pull request finding

df38833

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

fix: nil CELEnvironment in cmdeval test struct comparison

2f777f8

RunnerOptions.CELEnvironment is now populated by InitDefaults, so nil it out before struct comparison just like ResolveToImage. Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

fix: update condition testdata diff.patch with correct expected output

728c384

Signed-off-by: Surbhi <agarwalsurbhi1807@gmail.com>

		// CELEvaluator is an alias for runneroptions.CELEnvironment so that runner.go
		// can reference it within the fnruntime package without an import cycle.

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SurbhiAgarwal1 commented Feb 14, 2026

Changes

Example Usage

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SurbhiAgarwal1 commented Feb 18, 2026

Changes Made:

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Pull request overview

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