Add foo, bar, printenv and drop-comments test helper functions (#1256)

* Add foo, bar, and printenv test helper functions

Signed-off-by: Aravindhan Ayyanathan <aravindhan.a@est.tech>

* Address copilot review comments.

Signed-off-by: Aravindhan Ayyanathan <aravindhan.a@est.tech>

* Add drop-comments test krm function

Signed-off-by: Aravindhan Ayyanathan <aravindhan.a@est.tech>

* Use sdk v1.0.4 for functions

Signed-off-by: Aravindhan Ayyanathan <aravindhan.a@est.tech>

---------

Signed-off-by: Aravindhan Ayyanathan <aravindhan.a@est.tech>

Author: aravindtga

functions/go/Makefile

@@ -23,14 +23,18 @@ FUNCTIONS := \
 	annotate-apply-time-mutations \
 	apply-replacements \
 	apply-setters \
+	bar \
 	create-setters \
 	delete-annotations \
+	drop-comments \
 	ensure-name-substring \
+	foo \
 	gatekeeper \
 	generate-kpt-pkg-docs \
 	kubeconform \
 	list-setters \
 	no-op \
+	printenv \
 	remove-local-config-resources \
 	render-helm-chart \
 	search-replace \

functions/go/bar/README.md

@@ -0,0 +1,32 @@
+# bar
+
+## Overview
+
+<!--mdtogo:Short-->
+
+A test KRM function that prints 'bar' to stderr and exits with code 1.
+
+<!--mdtogo-->
+
+This function is used in kpt e2e tests to verify image pull policy behavior.
+It passes resources through unchanged but prints "bar" to stderr and returns a non-zero exit code.
+
+<!--mdtogo:Long-->
+
+## Usage
+
+The `bar` function requires no configuration. It prints "bar" to stderr, passes resources through, and exits 1.
+
+<!--mdtogo-->
+
+## Examples
+
+<!--mdtogo:Examples-->
+
+### Run imperatively
+
+```sh
+kpt fn eval --image ghcr.io/kptdev/krm-functions-catalog/bar
+```
+
+<!--mdtogo-->

functions/go/bar/generated/docs.go

@@ -0,0 +1,37 @@
+module github.com/kptdev/krm-functions-catalog/functions/go/bar
+
+go 1.26.3
+
+require github.com/kptdev/krm-functions-sdk/go/fn v1.0.4
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-openapi/jsonpointer v0.23.1 // indirect
+	github.com/go-openapi/jsonreference v0.21.5 // indirect
+	github.com/go-openapi/swag v0.26.0 // indirect
+	github.com/go-openapi/swag/cmdutils v0.26.0 // indirect
+	github.com/go-openapi/swag/conv v0.26.0 // indirect
+	github.com/go-openapi/swag/fileutils v0.26.0 // indirect
+	github.com/go-openapi/swag/jsonname v0.26.0 // indirect
+	github.com/go-openapi/swag/jsonutils v0.26.0 // indirect
+	github.com/go-openapi/swag/loading v0.26.0 // indirect
+	github.com/go-openapi/swag/mangling v0.26.0 // indirect
+	github.com/go-openapi/swag/netutils v0.26.0 // indirect
+	github.com/go-openapi/swag/stringutils v0.26.0 // indirect
+	github.com/go-openapi/swag/typeutils v0.26.0 // indirect
+	github.com/go-openapi/swag/yamlutils v0.26.0 // indirect
+	github.com/google/gnostic-models v0.7.1 // indirect
+	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/xlab/treeprint v1.2.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/sys v0.44.0 // indirect
+	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
+	k8s.io/apimachinery v0.36.1 // indirect
+	k8s.io/klog/v2 v2.140.0 // indirect
+	k8s.io/kube-openapi v0.0.0-20260520065146-aa012df4f4af // indirect
+	sigs.k8s.io/kustomize/kyaml v0.21.1 // indirect
+)

functions/go/bar/go.mod

@@ -0,0 +1,91 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-errors/errors v1.5.1 h1:ZwEMSLRCapFLflTpT7NKaAc7ukJ8ZPEjzlxt8rPN8bk=
+github.com/go-errors/errors v1.5.1/go.mod h1:sIVyrIiJhuEF+Pj9Ebtd6P/rEYROXFi3BopGUQ5a5Og=
+github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
+github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-openapi/jsonpointer v0.23.1 h1:1HBACs7XIwR2RcmItfdSFlALhGbe6S92p0ry4d1GWg4=
+github.com/go-openapi/jsonpointer v0.23.1/go.mod h1:iWRmZTrGn7XwYhtPt/fvdSFj1OfNBngqRT2UG3BxSqY=
+github.com/go-openapi/jsonreference v0.21.5 h1:6uCGVXU/aNF13AQNggxfysJ+5ZcU4nEAe+pJyVWRdiE=
+github.com/go-openapi/jsonreference v0.21.5/go.mod h1:u25Bw85sX4E2jzFodh1FOKMTZLcfifd1Q+iKKOUxExw=
+github.com/go-openapi/swag v0.26.0 h1:GVDXCmfvhfu1BxiHo8/FA+BbKmhecHnG3varjON5/RI=
+github.com/go-openapi/swag v0.26.0/go.mod h1:82g3193sZJRbocs7bNCqGfIgq8pkuwVwCfhKIRlEQF0=
+github.com/go-openapi/swag/cmdutils v0.26.0 h1:iowihOcvq7y4egO8cOq0dmfohz6wfeQ63U1EnuhO2TU=
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functions/go/bar/go.sum

@@ -0,0 +1,40 @@
+// Copyright 2026 The kpt Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	_ "embed"
+	"fmt"
+	"os"
+
+	"github.com/kptdev/krm-functions-sdk/go/fn"
+)
+
+//go:embed README.md
+var readme []byte
+
+//go:embed metadata.yaml
+var metadata []byte
+
+func main() {
+	if err := fn.AsMain(fn.ResourceListProcessorFunc(processBar), fn.WithDocs(readme, metadata)); err != nil {
+		os.Exit(1)
+	}
+}
+
+func processBar(_ *fn.ResourceList) (bool, error) {
+	fn.Logf("bar\n")
+	return false, fmt.Errorf("bar")
+}

functions/go/bar/main.go

@@ -0,0 +1,8 @@
+image: ghcr.io/kptdev/krm-functions-catalog/bar
+description: A test function that prints 'bar' to stderr and exits with code 1.
+hidden: true
+tags:
+  - mutator
+  - test
+sourceURL: https://github.com/kptdev/krm-functions-catalog/tree/main/functions/go/bar
+license: Apache-2.0

functions/go/bar/metadata.yaml

@@ -0,0 +1,32 @@
+# drop-comments
+
+## Overview
+
+<!--mdtogo:Short-->
+
+A test KRM function that strips all YAML comments from resources.
+
+<!--mdtogo-->
+
+This function is used in kpt e2e tests to verify that kpt's kyaml library
+correctly preserves comments even when a pipeline function removes them.
+
+<!--mdtogo:Long-->
+
+## Usage
+
+The `drop-comments` function requires no configuration. It removes all YAML comments from resources via a JSON round-trip.
+
+<!--mdtogo-->
+
+## Examples
+
+<!--mdtogo:Examples-->
+
+### Run imperatively
+
+```sh
+kpt fn eval --image ghcr.io/kptdev/krm-functions-catalog/drop-comments
+```
+
+<!--mdtogo-->

functions/go/drop-comments/README.md

@@ -0,0 +1,39 @@
+module github.com/kptdev/krm-functions-catalog/functions/go/drop-comments
+
+go 1.26.3
+
+require (
+	github.com/kptdev/krm-functions-sdk/go/fn v1.0.4
+	sigs.k8s.io/kustomize/kyaml v0.21.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-openapi/jsonpointer v0.23.1 // indirect
+	github.com/go-openapi/jsonreference v0.21.5 // indirect
+	github.com/go-openapi/swag v0.26.0 // indirect
+	github.com/go-openapi/swag/cmdutils v0.26.0 // indirect
+	github.com/go-openapi/swag/conv v0.26.0 // indirect
+	github.com/go-openapi/swag/fileutils v0.26.0 // indirect
+	github.com/go-openapi/swag/jsonname v0.26.0 // indirect
+	github.com/go-openapi/swag/jsonutils v0.26.0 // indirect
+	github.com/go-openapi/swag/loading v0.26.0 // indirect
+	github.com/go-openapi/swag/mangling v0.26.0 // indirect
+	github.com/go-openapi/swag/netutils v0.26.0 // indirect
+	github.com/go-openapi/swag/stringutils v0.26.0 // indirect
+	github.com/go-openapi/swag/typeutils v0.26.0 // indirect
+	github.com/go-openapi/swag/yamlutils v0.26.0 // indirect
+	github.com/google/gnostic-models v0.7.1 // indirect
+	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/xlab/treeprint v1.2.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/sys v0.44.0 // indirect
+	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
+	k8s.io/apimachinery v0.36.1 // indirect
+	k8s.io/klog/v2 v2.140.0 // indirect
+	k8s.io/kube-openapi v0.0.0-20260520065146-aa012df4f4af // indirect
+)