-
Notifications
You must be signed in to change notification settings - Fork 22
/
root.go
408 lines (355 loc) · 10.6 KB
/
root.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
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
// Copyright 2017 The kubecfg 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 (
"bytes"
"encoding/json"
goflag "flag"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
jsonnet "github.com/google/go-jsonnet"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh/terminal"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/tools/clientcmd"
"github.com/ksonnet/kubecfg/utils"
// Register auth plugins
_ "k8s.io/client-go/plugin/pkg/client/auth"
)
const (
flagVerbose = "verbose"
flagJpath = "jpath"
flagJUrl = "jurl"
flagExtVar = "ext-str"
flagExtVarFile = "ext-str-file"
flagTlaVar = "tla-str"
flagTlaVarFile = "tla-str-file"
flagResolver = "resolve-images"
flagResolvFail = "resolve-images-error"
)
var clientConfig clientcmd.ClientConfig
var overrides clientcmd.ConfigOverrides
func init() {
RootCmd.PersistentFlags().CountP(flagVerbose, "v", "Increase verbosity. May be given multiple times.")
RootCmd.PersistentFlags().StringArrayP(flagJpath, "J", nil, "Additional jsonnet library search path. May be repeated.")
RootCmd.MarkPersistentFlagFilename(flagJpath)
RootCmd.PersistentFlags().StringArrayP(flagJUrl, "U", nil, "Additional jsonnet library search path given as a URL. May be repeated.")
RootCmd.PersistentFlags().StringSliceP(flagExtVar, "V", nil, "Values of external variables")
RootCmd.PersistentFlags().StringSlice(flagExtVarFile, nil, "Read external variable from a file")
RootCmd.MarkPersistentFlagFilename(flagExtVarFile)
RootCmd.PersistentFlags().StringSliceP(flagTlaVar, "A", nil, "Values of top level arguments")
RootCmd.PersistentFlags().StringSlice(flagTlaVarFile, nil, "Read top level argument from a file")
RootCmd.MarkPersistentFlagFilename(flagTlaVarFile)
RootCmd.PersistentFlags().String(flagResolver, "noop", "Change implementation of resolveImage native function. One of: noop, registry")
RootCmd.PersistentFlags().String(flagResolvFail, "warn", "Action when resolveImage fails. One of ignore,warn,error")
// The "usual" clientcmd/kubectl flags
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
loadingRules.DefaultClientConfig = &clientcmd.DefaultClientConfig
kflags := clientcmd.RecommendedConfigOverrideFlags("")
RootCmd.PersistentFlags().StringVar(&loadingRules.ExplicitPath, "kubeconfig", "", "Path to a kube config. Only required if out-of-cluster")
RootCmd.MarkPersistentFlagFilename("kubeconfig")
clientcmd.BindOverrideFlags(&overrides, RootCmd.PersistentFlags(), kflags)
clientConfig = clientcmd.NewInteractiveDeferredLoadingClientConfig(loadingRules, &overrides, os.Stdin)
RootCmd.PersistentFlags().Set("logtostderr", "true")
}
// RootCmd is the root of cobra subcommand tree
var RootCmd = &cobra.Command{
Use: "kubecfg",
Short: "Synchronise Kubernetes resources with config files",
SilenceErrors: true,
SilenceUsage: true,
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
goflag.CommandLine.Parse([]string{})
flags := cmd.Flags()
out := cmd.OutOrStderr()
log.SetOutput(out)
logFmt := NewLogFormatter(out)
log.SetFormatter(logFmt)
verbosity, err := flags.GetCount(flagVerbose)
if err != nil {
return err
}
log.SetLevel(logLevel(verbosity))
return nil
},
}
// clientConfig.Namespace() is broken in client-go 3.0:
// namespace in config erroneously overrides explicit --namespace
func defaultNamespace(c clientcmd.ClientConfig) (string, error) {
if overrides.Context.Namespace != "" {
return overrides.Context.Namespace, nil
}
ns, _, err := c.Namespace()
return ns, err
}
func logLevel(verbosity int) log.Level {
switch verbosity {
case 0:
return log.InfoLevel
default:
return log.DebugLevel
}
}
type logFormatter struct {
escapes *terminal.EscapeCodes
colorise bool
}
// NewLogFormatter creates a new log.Formatter customised for writer
func NewLogFormatter(out io.Writer) log.Formatter {
var ret = logFormatter{}
if f, ok := out.(*os.File); ok {
ret.colorise = terminal.IsTerminal(int(f.Fd()))
ret.escapes = terminal.NewTerminal(f, "").Escape
}
return &ret
}
func (f *logFormatter) levelEsc(level log.Level) []byte {
switch level {
case log.DebugLevel:
return []byte{}
case log.WarnLevel:
return f.escapes.Yellow
case log.ErrorLevel, log.FatalLevel, log.PanicLevel:
return f.escapes.Red
default:
return f.escapes.Blue
}
}
func (f *logFormatter) Format(e *log.Entry) ([]byte, error) {
buf := bytes.Buffer{}
if f.colorise {
buf.Write(f.levelEsc(e.Level))
fmt.Fprintf(&buf, "%-5s ", strings.ToUpper(e.Level.String()))
buf.Write(f.escapes.Reset)
}
buf.WriteString(strings.TrimSpace(e.Message))
buf.WriteString("\n")
return buf.Bytes(), nil
}
func dirURL(path string) *url.URL {
if path[len(path)-1] != filepath.Separator {
// trailing slash is important
path = path + string(filepath.Separator)
}
return &url.URL{Scheme: "file", Path: path}
}
// JsonnetVM constructs a new jsonnet.VM, according to command line
// flags
func JsonnetVM(cmd *cobra.Command) (*jsonnet.VM, error) {
vm := jsonnet.MakeVM()
flags := cmd.Flags()
var searchUrls []*url.URL
jpath := filepath.SplitList(os.Getenv("KUBECFG_JPATH"))
jpathArgs, err := flags.GetStringArray(flagJpath)
if err != nil {
return nil, err
}
jpath = append(jpath, jpathArgs...)
for _, p := range jpath {
p, err := filepath.Abs(p)
if err != nil {
return nil, err
}
searchUrls = append(searchUrls, dirURL(p))
}
sURLs, err := flags.GetStringArray(flagJUrl)
if err != nil {
return nil, err
}
// Special URL scheme used to find embedded content
sURLs = append(sURLs, "internal:///")
for _, ustr := range sURLs {
u, err := url.Parse(ustr)
if err != nil {
return nil, err
}
if u.Path[len(u.Path)-1] != '/' {
u.Path = u.Path + "/"
}
searchUrls = append(searchUrls, u)
}
for _, u := range searchUrls {
log.Debugln("Jsonnet search path:", u)
}
vm.Importer(utils.MakeUniversalImporter(searchUrls))
extvars, err := flags.GetStringSlice(flagExtVar)
if err != nil {
return nil, err
}
for _, extvar := range extvars {
kv := strings.SplitN(extvar, "=", 2)
switch len(kv) {
case 1:
v, present := os.LookupEnv(kv[0])
if present {
vm.ExtVar(kv[0], v)
} else {
return nil, fmt.Errorf("Missing environment variable: %s", kv[0])
}
case 2:
vm.ExtVar(kv[0], kv[1])
}
}
extvarfiles, err := flags.GetStringSlice(flagExtVarFile)
if err != nil {
return nil, err
}
for _, extvar := range extvarfiles {
kv := strings.SplitN(extvar, "=", 2)
if len(kv) != 2 {
return nil, fmt.Errorf("Failed to parse %s: missing '=' in %s", flagExtVarFile, extvar)
}
v, err := ioutil.ReadFile(kv[1])
if err != nil {
return nil, err
}
vm.ExtVar(kv[0], string(v))
}
tlavars, err := flags.GetStringSlice(flagTlaVar)
if err != nil {
return nil, err
}
for _, tlavar := range tlavars {
kv := strings.SplitN(tlavar, "=", 2)
switch len(kv) {
case 1:
v, present := os.LookupEnv(kv[0])
if present {
vm.TLAVar(kv[0], v)
} else {
return nil, fmt.Errorf("Missing environment variable: %s", kv[0])
}
case 2:
vm.TLAVar(kv[0], kv[1])
}
}
tlavarfiles, err := flags.GetStringSlice(flagTlaVarFile)
if err != nil {
return nil, err
}
for _, tlavar := range tlavarfiles {
kv := strings.SplitN(tlavar, "=", 2)
if len(kv) != 2 {
return nil, fmt.Errorf("Failed to parse %s: missing '=' in %s", flagTlaVarFile, tlavar)
}
v, err := ioutil.ReadFile(kv[1])
if err != nil {
return nil, err
}
vm.TLAVar(kv[0], string(v))
}
resolver, err := buildResolver(cmd)
if err != nil {
return nil, err
}
utils.RegisterNativeFuncs(vm, resolver)
return vm, nil
}
func buildResolver(cmd *cobra.Command) (utils.Resolver, error) {
flags := cmd.Flags()
resolver, err := flags.GetString(flagResolver)
if err != nil {
return nil, err
}
failAction, err := flags.GetString(flagResolvFail)
if err != nil {
return nil, err
}
ret := resolverErrorWrapper{}
switch failAction {
case "ignore":
ret.OnErr = func(error) error { return nil }
case "warn":
ret.OnErr = func(err error) error {
log.Warning(err.Error())
return nil
}
case "error":
ret.OnErr = func(err error) error { return err }
default:
return nil, fmt.Errorf("Bad value for --%s: %s", flagResolvFail, failAction)
}
switch resolver {
case "noop":
ret.Inner = utils.NewIdentityResolver()
case "registry":
ret.Inner = utils.NewRegistryResolver(&http.Client{
Transport: utils.NewAuthTransport(http.DefaultTransport),
})
default:
return nil, fmt.Errorf("Bad value for --%s: %s", flagResolver, resolver)
}
return &ret, nil
}
type resolverErrorWrapper struct {
Inner utils.Resolver
OnErr func(error) error
}
func (r *resolverErrorWrapper) Resolve(image *utils.ImageName) error {
err := r.Inner.Resolve(image)
if err != nil {
err = r.OnErr(err)
}
return err
}
func readObjs(cmd *cobra.Command, paths []string) ([]*unstructured.Unstructured, error) {
vm, err := JsonnetVM(cmd)
if err != nil {
return nil, err
}
res := []*unstructured.Unstructured{}
for _, path := range paths {
objs, err := utils.Read(vm, path)
if err != nil {
return nil, fmt.Errorf("Error reading %s: %v", path, err)
}
res = append(res, utils.FlattenToV1(objs)...)
}
return res, nil
}
// For debugging
func dumpJSON(v interface{}) string {
buf := bytes.NewBuffer(nil)
enc := json.NewEncoder(buf)
enc.SetIndent("", " ")
if err := enc.Encode(v); err != nil {
return err.Error()
}
return string(buf.Bytes())
}
func restClientPool(cmd *cobra.Command) (dynamic.ClientPool, discovery.DiscoveryInterface, error) {
conf, err := clientConfig.ClientConfig()
if err != nil {
return nil, nil, fmt.Errorf("Unable to read kubectl config: %v", err)
}
disco, err := discovery.NewDiscoveryClientForConfig(conf)
if err != nil {
return nil, nil, err
}
discoCache := utils.NewMemcachedDiscoveryClient(disco)
mapper := discovery.NewDeferredDiscoveryRESTMapper(discoCache, dynamic.VersionInterfaces)
pathresolver := dynamic.LegacyAPIPathResolverFunc
pool := dynamic.NewClientPool(conf, mapper, pathresolver)
return pool, discoCache, nil
}