fix kyaml issue with multiline scalars

kyaml/internal/forked/github.com/go-yaml/yaml/emitterc.go

@@ -1699,8 +1699,8 @@ func yaml_emitter_write_single_quoted_scalar(emitter *yaml_emitter_t, value []by
 				if !put_break(emitter) {
 					return false
 				}
-			}
-			if !write_break(emitter, value, &i) {
+				i++
+			} else if !write_break(emitter, value, &i) {
 				return false
 			}
 			//emitter.indention = true

kyaml/internal/forked/github.com/go-yaml/yaml/scannerc.go

@@ -2653,7 +2653,7 @@ func yaml_parser_scan_flow_scalar(parser *yaml_parser_t, token *yaml_token_t, si
 			// Do we need to fold line breaks?
 			if len(leading_break) > 0 && leading_break[0] == '\n' {
 				if len(trailing_breaks) == 0 {
-					s = append(s, ' ')
+					s = append(s, '\n')
 				} else {
 					s = append(s, trailing_breaks...)
 				}

kyaml/kio/byteio_readwriter_test.go

@@ -51,8 +51,6 @@ items:
 `,
 		},
 
-		// TODO: See issue #https://github.com/kubernetes-sigs/kustomize/issues/4066
-		//  the line breaks in scalar values are lost.
 		{
 			name: "round_trip_with_multiline_scalar",
 			input: `
@@ -87,10 +85,14 @@ spec:
       description: CanonicalService is the Schema for the canonicalservices API
       properties:
         apiVersion:
-          description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+          description: 'APIVersion defines the versioned schema of this representation
+            of an object. Servers should convert recognized schemas to the latest
+            internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
           type: string
         kind:
-          description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+          description: 'Kind is a string value representing the REST resource this
+            object represents. Servers may infer this from the endpoint the client
+            submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
           type: string
 `,
 		},

kyaml/yaml/util.go

@@ -1,3 +1,6 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package yaml
 
 import (

kyaml/yaml/util_test.go

@@ -1,3 +1,6 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package yaml
 
 import (

plugin/builtin/helmchartinflationgenerator/include_crds_testdata.txt

@@ -20,14 +20,16 @@ spec:
       description: Workspace is the Schema for the workspaces API
       properties:
         apiVersion:
-          description: 'APIVersion defines the versioned schema of this representation
+          description: |-
+            APIVersion defines the versioned schema of this representation
             of an object. Servers should convert recognized schemas to the latest
-            internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources'
+            internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
           type: string
         kind:
-          description: 'Kind is a string value representing the REST resource this
+          description: |-
+            Kind is a string value representing the REST resource this
             object represents. Servers may infer this from the endpoint the client
-            submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds'
+            submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
           type: string
         metadata:
           type: object
@@ -111,8 +113,9 @@ spec:
                             description: The key to select.
                             type: string
                           name:
-                            description: 'Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
-                              TODO: Add other useful fields. apiVersion, kind, uid?'
+                            description: |-
+                              Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
+                              TODO: Add other useful fields. apiVersion, kind, uid?
                             type: string
                           optional:
                             description: Specify whether the ConfigMap or its key
@@ -122,10 +125,11 @@ spec:
                         - key
                         type: object
                       fieldRef:
-                        description: 'Selects a field of the pod: supports metadata.name,
+                        description: |-
+                          Selects a field of the pod: supports metadata.name,
                           metadata.namespace, metadata.labels, metadata.annotations,
                           spec.nodeName, spec.serviceAccountName, status.hostIP, status.podIP,
-                          status.podIPs.'
+                          status.podIPs.
                         properties:
                           apiVersion:
                             description: Version of the schema the FieldPath is written
@@ -139,14 +143,16 @@ spec:
                         - fieldPath
                         type: object
                       resourceFieldRef:
-                        description: 'Selects a resource of the container: only resources
+                        description: |-
+                          Selects a resource of the container: only resources
                           limits and requests (limits.cpu, limits.memory, limits.ephemeral-storage,
                           requests.cpu, requests.memory and requests.ephemeral-storage)
-                          are currently supported.'
+                          are currently supported.
                         properties:
                           containerName:
-                            description: 'Container name: required for volumes, optional
-                              for env vars'
+                            description: |-
+                              Container name: required for volumes, optional
+                              for env vars
                             type: string
                           divisor:
                             anyOf:
@@ -170,8 +176,9 @@ spec:
                               be a valid secret key.
                             type: string
                           name:
-                            description: 'Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
-                              TODO: Add other useful fields. apiVersion, kind, uid?'
+                            description: |-
+                              Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
+                              TODO: Add other useful fields. apiVersion, kind, uid?
                             type: string
                           optional:
                             description: Specify whether the Secret or its key must