forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
patch.go
294 lines (248 loc) · 9.36 KB
/
patch.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
Copyright 2014 The Kubernetes 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 cmd
import (
"fmt"
"io"
"reflect"
"strings"
jsonpatch "github.com/evanphx/json-patch"
"github.com/golang/glog"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/json"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubectl/scheme"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
"k8s.io/kubernetes/pkg/printers"
)
var patchTypes = map[string]types.PatchType{"json": types.JSONPatchType, "merge": types.MergePatchType, "strategic": types.StrategicMergePatchType}
// PatchOptions is the start of the data required to perform the operation. As new fields are added, add them here instead of
// referencing the cmd.Flags()
type PatchOptions struct {
resource.FilenameOptions
Local bool
OutputFormat string
}
var (
patchLong = templates.LongDesc(i18n.T(`
Update field(s) of a resource using strategic merge patch, a JSON merge patch, or a JSON patch.
JSON and YAML formats are accepted.
Please refer to the models in https://htmlpreview.github.io/?https://github.com/kubernetes/kubernetes/blob/HEAD/docs/api-reference/v1/definitions.html to find if a field is mutable.`))
patchExample = templates.Examples(i18n.T(`
# Partially update a node using a strategic merge patch. Specify the patch as JSON.
kubectl patch node k8s-node-1 -p '{"spec":{"unschedulable":true}}'
# Partially update a node using a strategic merge patch. Specify the patch as YAML.
kubectl patch node k8s-node-1 -p $'spec:\n unschedulable: true'
# Partially update a node identified by the type and name specified in "node.json" using strategic merge patch.
kubectl patch -f node.json -p '{"spec":{"unschedulable":true}}'
# Update a container's image; spec.containers[*].name is required because it's a merge key.
kubectl patch pod valid-pod -p '{"spec":{"containers":[{"name":"kubernetes-serve-hostname","image":"new image"}]}}'
# Update a container's image using a json patch with positional arrays.
kubectl patch pod valid-pod --type='json' -p='[{"op": "replace", "path": "/spec/containers/0/image", "value":"new image"}]'`))
)
func NewCmdPatch(f cmdutil.Factory, out io.Writer) *cobra.Command {
options := &PatchOptions{}
// retrieve a list of handled resources from printer as valid args
validArgs, argAliases := []string{}, []string{}
p, err := f.Printer(nil, printers.PrintOptions{
ColumnLabels: []string{},
})
cmdutil.CheckErr(err)
if p != nil {
validArgs = p.HandledResources()
argAliases = kubectl.ResourceAliases(validArgs)
}
cmd := &cobra.Command{
Use: "patch (-f FILENAME | TYPE NAME) -p PATCH",
Short: i18n.T("Update field(s) of a resource using strategic merge patch"),
Long: patchLong,
Example: patchExample,
Run: func(cmd *cobra.Command, args []string) {
options.OutputFormat = cmdutil.GetFlagString(cmd, "output")
err := RunPatch(f, out, cmd, args, options)
cmdutil.CheckErr(err)
},
ValidArgs: validArgs,
ArgAliases: argAliases,
}
cmd.Flags().StringP("patch", "p", "", "The patch to be applied to the resource JSON file.")
cmd.MarkFlagRequired("patch")
cmd.Flags().String("type", "strategic", fmt.Sprintf("The type of patch being provided; one of %v", sets.StringKeySet(patchTypes).List()))
cmdutil.AddPrinterFlags(cmd)
cmdutil.AddRecordFlag(cmd)
cmdutil.AddInclude3rdPartyFlags(cmd)
usage := "identifying the resource to update"
cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
cmd.Flags().BoolVar(&options.Local, "local", false, "If true, patch will operate on the content of the file, not the server-side resource.")
return cmd
}
func RunPatch(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, options *PatchOptions) error {
switch {
case options.Local && len(args) != 0:
return fmt.Errorf("cannot specify --local and server resources")
}
cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
if err != nil {
return err
}
patchType := types.StrategicMergePatchType
patchTypeString := strings.ToLower(cmdutil.GetFlagString(cmd, "type"))
if len(patchTypeString) != 0 {
ok := false
patchType, ok = patchTypes[patchTypeString]
if !ok {
return cmdutil.UsageErrorf(cmd, "--type must be one of %v, not %q",
sets.StringKeySet(patchTypes).List(), patchTypeString)
}
}
patch := cmdutil.GetFlagString(cmd, "patch")
if len(patch) == 0 {
return cmdutil.UsageErrorf(cmd, "Must specify -p to patch")
}
patchBytes, err := yaml.ToJSON([]byte(patch))
if err != nil {
return fmt.Errorf("unable to parse %q: %v", patch, err)
}
r := f.NewBuilder().
Unstructured().
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, &options.FilenameOptions).
ResourceTypeOrNameArgs(false, args...).
Flatten().
Do()
err = r.Err()
if err != nil {
return err
}
count := 0
err = r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
name, namespace := info.Name, info.Namespace
mapping := info.ResourceMapping()
client, err := f.UnstructuredClientForMapping(mapping)
if err != nil {
return err
}
if !options.Local {
dataChangedMsg := "not patched"
didPatch := false
helper := resource.NewHelper(client, mapping)
patchedObj, err := helper.Patch(namespace, name, patchType, patchBytes)
if err != nil {
return err
}
// Record the change as a second patch to avoid trying to merge with a user's patch data
if cmdutil.ShouldRecord(cmd, info) {
// Copy the resource info and update with the result of applying the user's patch
infoCopy := *info
infoCopy.Object = patchedObj
if patch, patchType, err := cmdutil.ChangeResourcePatch(&infoCopy, f.Command(cmd, true)); err == nil {
if recordedObj, err := helper.Patch(info.Namespace, info.Name, patchType, patch); err != nil {
glog.V(4).Infof("error recording reason: %v", err)
} else {
patchedObj = recordedObj
}
}
}
count++
oldData, err := json.Marshal(info.Object)
if err != nil {
return err
}
newData, err := json.Marshal(patchedObj)
if err != nil {
return err
}
if !reflect.DeepEqual(oldData, newData) {
didPatch = true
dataChangedMsg = "patched"
}
// After computing whether we changed data, refresh the resource info with the resulting object
if err := info.Refresh(patchedObj, true); err != nil {
return err
}
if len(options.OutputFormat) > 0 && options.OutputFormat != "name" {
return f.PrintResourceInfoForCommand(cmd, info, out)
}
f.PrintSuccess(r.Mapper().RESTMapper, options.OutputFormat == "name", out, info.Mapping.Resource, info.Name, false, dataChangedMsg)
// if object was not successfully patched, exit with error code 1
if !didPatch {
return cmdutil.ErrExit
}
return nil
}
count++
originalObjJS, err := runtime.Encode(unstructured.UnstructuredJSONScheme, info.Object)
if err != nil {
return err
}
originalPatchedObjJS, err := getPatchedJSON(patchType, originalObjJS, patchBytes, mapping.GroupVersionKind, scheme.Scheme)
if err != nil {
return err
}
targetObj, err := runtime.Decode(unstructured.UnstructuredJSONScheme, originalPatchedObjJS)
if err != nil {
return err
}
// TODO: if we ever want to go generic, this allows a clean -o yaml without trying to print columns or anything
// rawExtension := &runtime.Unknown{
// Raw: originalPatchedObjJS,
// }
if err := info.Refresh(targetObj, true); err != nil {
return err
}
return f.PrintResourceInfoForCommand(cmd, info, out)
})
if err != nil {
return err
}
if count == 0 {
return fmt.Errorf("no objects passed to patch")
}
return nil
}
func getPatchedJSON(patchType types.PatchType, originalJS, patchJS []byte, gvk schema.GroupVersionKind, creater runtime.ObjectCreater) ([]byte, error) {
switch patchType {
case types.JSONPatchType:
patchObj, err := jsonpatch.DecodePatch(patchJS)
if err != nil {
return nil, err
}
return patchObj.Apply(originalJS)
case types.MergePatchType:
return jsonpatch.MergePatch(originalJS, patchJS)
case types.StrategicMergePatchType:
// get a typed object for this GVK if we need to apply a strategic merge patch
obj, err := creater.New(gvk)
if err != nil {
return nil, fmt.Errorf("cannot apply strategic merge patch for %s locally, try --type merge", gvk.String())
}
return strategicpatch.StrategicMergePatch(originalJS, patchJS, obj)
default:
// only here as a safety net - go-restful filters content-type
return nil, fmt.Errorf("unknown Content-Type header for patch: %v", patchType)
}
}