forked from kubernetes-sigs/kustomize
/
kusttarget.go
315 lines (296 loc) · 8.73 KB
/
kusttarget.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
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
/*
Copyright 2018 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 target implements state for the set of all resources to customize.
package target
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"github.com/ghodss/yaml"
"github.com/pkg/errors"
"sigs.k8s.io/kustomize/pkg/constants"
"sigs.k8s.io/kustomize/pkg/ifc"
"sigs.k8s.io/kustomize/pkg/ifc/transformer"
interror "sigs.k8s.io/kustomize/pkg/internal/error"
patchtransformer "sigs.k8s.io/kustomize/pkg/patch/transformer"
"sigs.k8s.io/kustomize/pkg/resmap"
"sigs.k8s.io/kustomize/pkg/resource"
"sigs.k8s.io/kustomize/pkg/transformers"
"sigs.k8s.io/kustomize/pkg/transformers/config"
"sigs.k8s.io/kustomize/pkg/types"
)
// KustTarget encapsulates the entirety of a kustomization build.
type KustTarget struct {
kustomization *types.Kustomization
ldr ifc.Loader
rFactory *resmap.Factory
tFactory transformer.Factory
}
// NewKustTarget returns a new instance of KustTarget primed with a Loader.
func NewKustTarget(
ldr ifc.Loader,
rFactory *resmap.Factory,
tFactory transformer.Factory) (*KustTarget, error) {
content, err := loadKustFile(ldr)
if err != nil {
return nil, err
}
content = types.DealWithDeprecatedFields(content)
var k types.Kustomization
err = unmarshal(content, &k)
if err != nil {
return nil, err
}
errs := k.EnforceFields()
if len(errs) > 0 {
return nil, fmt.Errorf("Failed to read kustomization file under %s:\n"+strings.Join(errs, "\n"), ldr.Root())
}
return &KustTarget{
kustomization: &k,
ldr: ldr,
rFactory: rFactory,
tFactory: tFactory,
}, nil
}
func quoted(l []string) []string {
r := make([]string, len(l))
for i, v := range l {
r[i] = "'" + v + "'"
}
return r
}
func commaOr(q []string) string {
return strings.Join(q[:len(q)-1], ", ") + " or " + q[len(q)-1]
}
func loadKustFile(ldr ifc.Loader) ([]byte, error) {
var content []byte
match := 0
for _, kf := range constants.KustomizationFileNames {
c, err := ldr.Load(kf)
if err == nil {
match += 1
content = c
}
}
switch match {
case 0:
return nil, fmt.Errorf(
"unable to find one of %v in directory '%s'",
commaOr(quoted(constants.KustomizationFileNames)), ldr.Root())
case 1:
return content, nil
default:
return nil, fmt.Errorf("Found multiple kustomization files under: %s\n", ldr.Root())
}
}
func unmarshal(y []byte, o interface{}) error {
j, err := yaml.YAMLToJSON(y)
if err != nil {
return err
}
dec := json.NewDecoder(bytes.NewReader(j))
dec.DisallowUnknownFields()
return dec.Decode(o)
}
// MakeCustomizedResMap creates a ResMap per kustomization instructions.
// The Resources in the returned ResMap are fully customized.
func (kt *KustTarget) MakeCustomizedResMap() (resmap.ResMap, error) {
ra, err := kt.AccumulateTarget()
if err != nil {
return nil, err
}
err = ra.Transform(kt.tFactory.MakeHashTransformer())
if err != nil {
return nil, err
}
// Given that names have changed (prefixs/suffixes added),
// fix all the back references to those names.
err = ra.FixBackReferences()
if err != nil {
return nil, err
}
// With all the back references fixed, it's OK to resolve Vars.
err = ra.ResolveVars()
return ra.ResMap(), err
}
func (kt *KustTarget) shouldAddHashSuffixesToGeneratedResources() bool {
return kt.kustomization.GeneratorOptions == nil ||
!kt.kustomization.GeneratorOptions.DisableNameSuffixHash
}
// AccumulateTarget returns a new ResAccumulator,
// holding customized resources and the data/rules used
// to do so. The name back references and vars are
// not yet fixed.
func (kt *KustTarget) AccumulateTarget() (
ra *ResAccumulator, err error) {
// TODO(monopole): Get rid of the KustomizationErrors accumulator.
// It's not consistently used, and complicates tests.
errs := &interror.KustomizationErrors{}
ra, errs = kt.accumulateBases()
resources, err := kt.rFactory.FromFiles(
kt.ldr, kt.kustomization.Resources)
if err != nil {
errs.Append(errors.Wrap(err, "rawResources failed to read Resources"))
}
if len(errs.Get()) > 0 {
return ra, errs
}
err = ra.MergeResourcesWithErrorOnIdCollision(resources)
if err != nil {
errs.Append(errors.Wrap(err, "MergeResourcesWithErrorOnIdCollision"))
}
tConfig, err := config.MakeTransformerConfig(
kt.ldr, kt.kustomization.Configurations)
if err != nil {
return nil, err
}
err = ra.MergeConfig(tConfig)
if err != nil {
errs.Append(errors.Wrap(err, "MergeConfig"))
}
err = ra.MergeVars(kt.kustomization.Vars)
if err != nil {
errs.Append(errors.Wrap(err, "MergeVars"))
}
crdTc, err := config.LoadConfigFromCRDs(kt.ldr, kt.kustomization.Crds)
if err != nil {
errs.Append(errors.Wrap(err, "LoadCRDs"))
}
err = ra.MergeConfig(crdTc)
if err != nil {
errs.Append(errors.Wrap(err, "merge CRDs"))
}
resMap, err := kt.generateConfigMapsAndSecrets(errs)
if err != nil {
errs.Append(errors.Wrap(err, "generateConfigMapsAndSecrets"))
}
err = ra.MergeResourcesWithOverride(resMap)
if err != nil {
return nil, err
}
patches, err := kt.rFactory.RF().SliceFromPatches(
kt.ldr, kt.kustomization.PatchesStrategicMerge)
if err != nil {
errs.Append(errors.Wrap(err, "SliceFromPatches"))
}
if len(errs.Get()) > 0 {
return nil, errs
}
t, err := kt.newTransformer(patches, ra.tConfig)
if err != nil {
return nil, err
}
err = ra.Transform(t)
if err != nil {
return nil, err
}
return ra, nil
}
func (kt *KustTarget) generateConfigMapsAndSecrets(
errs *interror.KustomizationErrors) (resmap.ResMap, error) {
kt.rFactory.Set(kt.ldr)
cms, err := kt.rFactory.NewResMapFromConfigMapArgs(
kt.kustomization.ConfigMapGenerator, kt.kustomization.GeneratorOptions)
if err != nil {
errs.Append(errors.Wrap(err, "NewResMapFromConfigMapArgs"))
}
secrets, err := kt.rFactory.NewResMapFromSecretArgs(
kt.kustomization.SecretGenerator, kt.kustomization.GeneratorOptions)
if err != nil {
errs.Append(errors.Wrap(err, "NewResMapFromSecretArgs"))
}
return resmap.MergeWithErrorOnIdCollision(cms, secrets)
}
// accumulateBases returns a new ResAccumulator
// holding customized resources and the data/rules
// used to customized them from only the _bases_
// of this KustTarget.
func (kt *KustTarget) accumulateBases() (
ra *ResAccumulator, errs *interror.KustomizationErrors) {
errs = &interror.KustomizationErrors{}
ra = MakeEmptyAccumulator()
for _, path := range kt.kustomization.Bases {
ldr, err := kt.ldr.New(path)
if err != nil {
errs.Append(errors.Wrap(err, "couldn't make loader for "+path))
continue
}
subKt, err := NewKustTarget(
ldr, kt.rFactory, kt.tFactory)
if err != nil {
errs.Append(errors.Wrap(err, "couldn't make target for "+path))
ldr.Cleanup()
continue
}
subRa, err := subKt.AccumulateTarget()
if err != nil {
errs.Append(errors.Wrap(err, "AccumulateTarget"))
ldr.Cleanup()
continue
}
err = ra.MergeAccumulator(subRa)
if err != nil {
errs.Append(errors.Wrap(err, path))
}
ldr.Cleanup()
}
return ra, errs
}
// newTransformer makes a Transformer that does a collection
// of object transformations.
func (kt *KustTarget) newTransformer(
patches []*resource.Resource, tConfig *config.TransformerConfig) (
transformers.Transformer, error) {
var r []transformers.Transformer
t, err := kt.tFactory.MakePatchTransformer(patches, kt.rFactory.RF())
if err != nil {
return nil, err
}
r = append(r, t)
r = append(r, transformers.NewNamespaceTransformer(
string(kt.kustomization.Namespace), tConfig.NameSpace))
t, err = transformers.NewNamePrefixSuffixTransformer(
string(kt.kustomization.NamePrefix),
string(kt.kustomization.NameSuffix),
tConfig.NamePrefix,
)
if err != nil {
return nil, err
}
r = append(r, t)
t, err = transformers.NewLabelsMapTransformer(
kt.kustomization.CommonLabels, tConfig.CommonLabels)
if err != nil {
return nil, err
}
r = append(r, t)
t, err = transformers.NewAnnotationsMapTransformer(
kt.kustomization.CommonAnnotations, tConfig.CommonAnnotations)
if err != nil {
return nil, err
}
r = append(r, t)
t, err = patchtransformer.NewPatchJson6902Factory(kt.ldr).
MakePatchJson6902Transformer(kt.kustomization.PatchesJson6902)
if err != nil {
return nil, err
}
r = append(r, t)
t, err = transformers.NewImageTransformer(kt.kustomization.Images)
if err != nil {
return nil, err
}
r = append(r, t)
return transformers.NewMultiTransformer(r), nil
}