/
snap_op.go
502 lines (426 loc) · 14.6 KB
/
snap_op.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
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2022 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"os"
"path/filepath"
)
// TransactionType says whether we want to treat each snap separately
// (the transaction is per snap) or whether to consider the call a
// single transaction so everything is reverted if it fails for just
// one snap. This applies to installs and updates, which can be done
// for multiple snaps in the same API call.
type TransactionType string
const (
TransactionAllSnaps TransactionType = "all-snaps"
TransactionPerSnap TransactionType = "per-snap"
)
type SnapOptions struct {
Channel string `json:"channel,omitempty"`
Revision string `json:"revision,omitempty"`
CohortKey string `json:"cohort-key,omitempty"`
LeaveCohort bool `json:"leave-cohort,omitempty"`
DevMode bool `json:"devmode,omitempty"`
JailMode bool `json:"jailmode,omitempty"`
Classic bool `json:"classic,omitempty"`
Dangerous bool `json:"dangerous,omitempty"`
IgnoreValidation bool `json:"ignore-validation,omitempty"`
IgnoreRunning bool `json:"ignore-running,omitempty"`
Unaliased bool `json:"unaliased,omitempty"`
Prefer bool `json:"prefer,omitempty"`
Purge bool `json:"purge,omitempty"`
Amend bool `json:"amend,omitempty"`
Transaction TransactionType `json:"transaction,omitempty"`
QuotaGroupName string `json:"quota-group,omitempty"`
ValidationSets []string `json:"validation-sets,omitempty"`
Time string `json:"time,omitempty"`
HoldLevel string `json:"hold-level,omitempty"`
Users []string `json:"users,omitempty"`
}
func writeFieldBool(mw *multipart.Writer, key string, val bool) error {
if !val {
return nil
}
return mw.WriteField(key, "true")
}
type field struct {
field string
value bool
}
func writeFields(mw *multipart.Writer, fields []field) error {
for _, fd := range fields {
if err := writeFieldBool(mw, fd.field, fd.value); err != nil {
return err
}
}
return nil
}
func (opts *SnapOptions) writeModeFields(mw *multipart.Writer) error {
fields := []field{
{"devmode", opts.DevMode},
{"classic", opts.Classic},
{"jailmode", opts.JailMode},
{"dangerous", opts.Dangerous},
}
return writeFields(mw, fields)
}
func (opts *SnapOptions) writeOptionFields(mw *multipart.Writer) error {
fields := []field{
{"ignore-running", opts.IgnoreRunning},
{"unaliased", opts.Unaliased},
{"prefer", opts.Prefer},
}
if opts.Transaction != "" {
if err := mw.WriteField("transaction", string(opts.Transaction)); err != nil {
return err
}
}
if opts.QuotaGroupName != "" {
if err := mw.WriteField("quota-group", opts.QuotaGroupName); err != nil {
return err
}
}
return writeFields(mw, fields)
}
type actionData struct {
Action string `json:"action"`
Name string `json:"name,omitempty"`
SnapPath string `json:"snap-path,omitempty"`
*SnapOptions
}
type multiActionData struct {
Action string `json:"action"`
Snaps []string `json:"snaps,omitempty"`
Users []string `json:"users,omitempty"`
Transaction TransactionType `json:"transaction,omitempty"`
IgnoreRunning bool `json:"ignore-running,omitempty"`
Purge bool `json:"purge,omitempty"`
ValidationSets []string `json:"validation-sets,omitempty"`
Time string `json:"time,omitempty"`
HoldLevel string `json:"hold-level,omitempty"`
}
// Install adds the snap with the given name from the given channel (or
// the system default channel if not).
func (client *Client) Install(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("install", name, options)
}
func (client *Client) InstallMany(names []string, options *SnapOptions) (changeID string, err error) {
return client.doMultiSnapAction("install", names, options)
}
// Remove removes the snap with the given name.
func (client *Client) Remove(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("remove", name, options)
}
func (client *Client) RemoveMany(names []string, options *SnapOptions) (changeID string, err error) {
return client.doMultiSnapAction("remove", names, options)
}
// Refresh refreshes the snap with the given name (switching it to track
// the given channel if given).
func (client *Client) Refresh(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("refresh", name, options)
}
func (client *Client) RefreshMany(names []string, options *SnapOptions) (changeID string, err error) {
return client.doMultiSnapAction("refresh", names, options)
}
func (client *Client) HoldRefreshes(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("hold", name, options)
}
func (client *Client) HoldRefreshesMany(names []string, options *SnapOptions) (changeID string, err error) {
return client.doMultiSnapAction("hold", names, options)
}
func (client *Client) UnholdRefreshes(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("unhold", name, options)
}
func (client *Client) UnholdRefreshesMany(names []string, options *SnapOptions) (changeID string, err error) {
return client.doMultiSnapAction("unhold", names, options)
}
func (client *Client) Enable(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("enable", name, options)
}
func (client *Client) Disable(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("disable", name, options)
}
// Revert rolls the snap back to the previous on-disk state
func (client *Client) Revert(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("revert", name, options)
}
// Switch moves the snap to a different channel without a refresh
func (client *Client) Switch(name string, options *SnapOptions) (changeID string, err error) {
return client.doSnapAction("switch", name, options)
}
// SnapshotMany snapshots many snaps (all, if names empty) for many users (all, if users is empty).
func (client *Client) SnapshotMany(names []string, users []string) (setID uint64, changeID string, err error) {
result, changeID, err := client.doMultiSnapActionFull("snapshot", names, &SnapOptions{Users: users})
if err != nil {
return 0, "", err
}
if len(result) == 0 {
return 0, "", fmt.Errorf("server result does not contain snapshot set identifier")
}
var x struct {
SetID uint64 `json:"set-id"`
}
if err := json.Unmarshal(result, &x); err != nil {
return 0, "", err
}
return x.SetID, changeID, nil
}
var ErrDangerousNotApplicable = fmt.Errorf("dangerous option only meaningful when installing from a local file")
func (client *Client) doSnapAction(actionName string, snapName string, options *SnapOptions) (changeID string, err error) {
if options != nil && options.Dangerous {
return "", ErrDangerousNotApplicable
}
action := actionData{
Action: actionName,
SnapOptions: options,
}
data, err := json.Marshal(&action)
if err != nil {
return "", fmt.Errorf("cannot marshal snap action: %s", err)
}
path := fmt.Sprintf("/v2/snaps/%s", snapName)
headers := map[string]string{
"Content-Type": "application/json",
}
return client.doAsync("POST", path, nil, headers, bytes.NewBuffer(data))
}
func (client *Client) doMultiSnapAction(actionName string, snaps []string, options *SnapOptions) (changeID string, err error) {
_, changeID, err = client.doMultiSnapActionFull(actionName, snaps, options)
return changeID, err
}
func (client *Client) doMultiSnapActionFull(actionName string, snaps []string, options *SnapOptions) (result json.RawMessage, changeID string, err error) {
action := multiActionData{
Action: actionName,
Snaps: snaps,
}
if options != nil {
// TODO: consider returning error when options.Dangerous is set
action.Users = options.Users
action.Transaction = options.Transaction
action.IgnoreRunning = options.IgnoreRunning
action.Purge = options.Purge
action.ValidationSets = options.ValidationSets
action.Time = options.Time
action.HoldLevel = options.HoldLevel
}
data, err := json.Marshal(&action)
if err != nil {
return nil, "", fmt.Errorf("cannot marshal multi-snap action: %s", err)
}
headers := map[string]string{
"Content-Type": "application/json",
}
return client.doAsyncFull("POST", "/v2/snaps", nil, headers, bytes.NewBuffer(data), nil)
}
// InstallPath sideloads the snap with the given path under optional provided name,
// returning the UUID of the background operation upon success.
func (client *Client) InstallPath(path, name string, options *SnapOptions) (changeID string, err error) {
f, err := os.Open(path)
if err != nil {
return "", fmt.Errorf("cannot open %q: %w", path, err)
}
action := actionData{
Action: "install",
Name: name,
SnapPath: path,
SnapOptions: options,
}
return client.sendLocalSnaps([]string{path}, []*os.File{f}, action)
}
// InstallPathMany sideloads the snaps with the given paths,
// returning the UUID of the background operation upon success.
func (client *Client) InstallPathMany(paths []string, options *SnapOptions) (changeID string, err error) {
action := actionData{
Action: "install",
SnapOptions: options,
}
var files []*os.File
for _, path := range paths {
f, err := os.Open(path)
if err != nil {
for _, openFile := range files {
openFile.Close()
}
return "", fmt.Errorf("cannot open %q: %w", path, err)
}
files = append(files, f)
}
return client.sendLocalSnaps(paths, files, action)
}
func (client *Client) sendLocalSnaps(paths []string, files []*os.File, action actionData) (string, error) {
pr, pw := io.Pipe()
mw := multipart.NewWriter(pw)
go sendSnapFiles(paths, files, pw, mw, &action)
headers := map[string]string{
"Content-Type": mw.FormDataContentType(),
}
_, changeID, err := client.doAsyncFull("POST", "/v2/snaps", nil, headers, pr, doNoTimeoutAndRetry)
return changeID, err
}
// Try
func (client *Client) Try(path string, options *SnapOptions) (changeID string, err error) {
if options == nil {
options = &SnapOptions{}
}
if options.Dangerous {
return "", ErrDangerousNotApplicable
}
buf := bytes.NewBuffer(nil)
mw := multipart.NewWriter(buf)
mw.WriteField("action", "try")
mw.WriteField("snap-path", path)
options.writeModeFields(mw)
mw.Close()
headers := map[string]string{
"Content-Type": mw.FormDataContentType(),
}
return client.doAsync("POST", "/v2/snaps", nil, headers, buf)
}
func sendSnapFiles(paths []string, files []*os.File, pw *io.PipeWriter, mw *multipart.Writer, action *actionData) {
defer func() {
for _, f := range files {
f.Close()
}
}()
if action.SnapOptions == nil {
action.SnapOptions = &SnapOptions{}
}
type field struct {
name string
value string
}
fields := []field{{"action", action.Action}}
if len(paths) == 1 {
fields = append(fields, []field{
{"name", action.Name},
{"snap-path", action.SnapPath},
{"channel", action.Channel}}...)
}
for _, s := range fields {
if s.value == "" {
continue
}
if err := mw.WriteField(s.name, s.value); err != nil {
pw.CloseWithError(err)
return
}
}
if err := action.writeModeFields(mw); err != nil {
pw.CloseWithError(err)
return
}
if err := action.writeOptionFields(mw); err != nil {
pw.CloseWithError(err)
return
}
for i, file := range files {
path := paths[i]
fw, err := mw.CreateFormFile("snap", filepath.Base(path))
if err != nil {
pw.CloseWithError(err)
return
}
_, err = io.Copy(fw, file)
if err != nil {
pw.CloseWithError(err)
return
}
}
mw.Close()
pw.Close()
}
type snapRevisionOptions struct {
Channel string `json:"channel,omitempty"`
Revision string `json:"revision,omitempty"`
CohortKey string `json:"cohort-key,omitempty"`
}
type downloadAction struct {
SnapName string `json:"snap-name"`
snapRevisionOptions
HeaderPeek bool `json:"header-peek,omitempty"`
ResumeToken string `json:"resume-token,omitempty"`
}
type DownloadInfo struct {
SuggestedFileName string
Size int64
Sha3_384 string
ResumeToken string
}
type DownloadOptions struct {
SnapOptions
HeaderPeek bool
ResumeToken string
Resume int64
}
// Download will stream the given snap to the client
func (client *Client) Download(name string, options *DownloadOptions) (dlInfo *DownloadInfo, r io.ReadCloser, err error) {
if options == nil {
options = &DownloadOptions{}
}
action := downloadAction{
SnapName: name,
snapRevisionOptions: snapRevisionOptions{
Channel: options.Channel,
CohortKey: options.CohortKey,
Revision: options.Revision,
},
HeaderPeek: options.HeaderPeek,
ResumeToken: options.ResumeToken,
}
data, err := json.Marshal(&action)
if err != nil {
return nil, nil, fmt.Errorf("cannot marshal snap action: %s", err)
}
headers := map[string]string{
"Content-Type": "application/json",
}
if options.Resume > 0 {
headers["range"] = fmt.Sprintf("bytes: %d-", options.Resume)
}
// no deadline for downloads
ctx := context.Background()
rsp, err := client.raw(ctx, "POST", "/v2/download", nil, headers, bytes.NewBuffer(data))
if err != nil {
return nil, nil, err
}
if rsp.StatusCode != 200 {
var r response
defer rsp.Body.Close()
if err := decodeInto(rsp.Body, &r); err != nil {
return nil, nil, err
}
return nil, nil, r.err(client, rsp.StatusCode)
}
matches := contentDispositionMatcher(rsp.Header.Get("Content-Disposition"))
if matches == nil || matches[1] == "" {
return nil, nil, fmt.Errorf("cannot determine filename")
}
dlInfo = &DownloadInfo{
SuggestedFileName: matches[1],
Size: rsp.ContentLength,
Sha3_384: rsp.Header.Get("Snap-Sha3-384"),
ResumeToken: rsp.Header.Get("Snap-Download-Token"),
}
return dlInfo, rsp.Body, nil
}