kubectl apply add --overwrite flag

pkg/kubectl/cmd/apply.go

@@ -85,6 +85,7 @@ func NewCmdApply(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	usage := "Filename, directory, or URL to file that contains the configuration to apply"
 	kubectl.AddJsonFilenameFlag(cmd, &options.Filenames, usage)
 	cmd.MarkFlagRequired("filename")
+	cmd.Flags().Bool("overwrite", true, "Automatically resolve conflicts between the modified and live configuration by using values from the modified configuration")
 	cmdutil.AddValidateFlags(cmd)
 	cmdutil.AddRecursiveFlag(cmd, &options.Recursive)
 	cmdutil.AddOutputFlagsForMutation(cmd)
@@ -170,8 +171,9 @@ func RunApply(f *cmdutil.Factory, cmd *cobra.Command, out io.Writer, options *Ap
 			return nil
 		}
 
+		overwrite := cmdutil.GetFlagBool(cmd, "overwrite")
 		helper := resource.NewHelper(info.Client, info.Mapping)
-		patcher := NewPatcher(encoder, decoder, info.Mapping, helper)
+		patcher := NewPatcher(encoder, decoder, info.Mapping, helper, overwrite)
 
 		patchBytes, err := patcher.patch(info.Object, modified, info.Source, info.Namespace, info.Name)
 		if err != nil {
@@ -212,16 +214,18 @@ type patcher struct {
 	mapping *meta.RESTMapping
 	helper  *resource.Helper
 
-	backOff clockwork.Clock
+	overwrite bool
+	backOff   clockwork.Clock
 }
 
-func NewPatcher(encoder runtime.Encoder, decoder runtime.Decoder, mapping *meta.RESTMapping, helper *resource.Helper) *patcher {
+func NewPatcher(encoder runtime.Encoder, decoder runtime.Decoder, mapping *meta.RESTMapping, helper *resource.Helper, overwrite bool) *patcher {
 	return &patcher{
-		encoder: encoder,
-		decoder: decoder,
-		mapping: mapping,
-		helper:  helper,
-		backOff: clockwork.NewRealClock(),
+		encoder:   encoder,
+		decoder:   decoder,
+		mapping:   mapping,
+		helper:    helper,
+		overwrite: overwrite,
+		backOff:   clockwork.NewRealClock(),
 	}
 }
 
@@ -249,7 +253,7 @@ func (p *patcher) patchSimple(obj runtime.Object, modified []byte, source, names
 	}
 
 	// Compute a three way strategic merge patch to send to server.
-	patch, err := strategicpatch.CreateThreeWayMergePatch(original, modified, current, versionedObject, true)
+	patch, err := strategicpatch.CreateThreeWayMergePatch(original, modified, current, versionedObject, p.overwrite)
 	if err != nil {
 		format := "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor:"
 		return nil, cmdutil.AddSourceToErr(fmt.Sprintf(format, original, modified, current), source, err)