forked from vmware-archive/atc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
image.go
246 lines (203 loc) · 5.86 KB
/
image.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
package image
import (
"archive/tar"
"crypto/sha256"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/db"
"github.com/concourse/atc/resource"
"github.com/concourse/atc/worker"
)
const ImageMetadataFile = "metadata.json"
// ErrImageUnavailable is returned when a task's configured image resource
// has no versions.
var ErrImageUnavailable = errors.New("no versions of image available")
var ErrImageGetDidNotProduceVolume = errors.New("fetching the image did not produce a volume")
type image struct {
logger lager.Logger
signals <-chan os.Signal
imageResource atc.ImageResource
workerID worker.Identifier
workerMetadata worker.Metadata
workerTags atc.Tags
teamID int
customTypes atc.ResourceTypes
tracker resource.Tracker
imageFetchingDelegate worker.ImageFetchingDelegate
workerClient worker.Client
privileged bool
resourceFetcher resource.Fetcher
}
func (i *image) Fetch() (worker.Volume, io.ReadCloser, atc.Version, error) {
version, err := i.getLatestVersion()
if err != nil {
i.logger.Error("failed-to-get-latest-image-version", err)
return nil, nil, nil, err
}
cacheID := resource.ResourceCacheIdentifier{
Type: resource.ResourceType(i.imageResource.Type),
Version: version,
Source: i.imageResource.Source,
}
volumeID := cacheID.VolumeIdentifier()
err = i.imageFetchingDelegate.ImageVersionDetermined(volumeID)
if err != nil {
return nil, nil, nil, err
}
getSess := resource.Session{
ID: i.workerID,
Metadata: i.workerMetadata,
}
getSess.ID.Stage = db.ContainerStageGet
getSess.ID.ImageResourceType = i.imageResource.Type
getSess.ID.ImageResourceSource = i.imageResource.Source
getSess.Metadata.Type = db.ContainerTypeGet
getSess.Metadata.WorkingDirectory = ""
getSess.Metadata.EnvironmentVariables = nil
resourceType := resource.ResourceType(i.imageResource.Type)
resourceOptions := &imageResource{
imageFetchingDelegate: i.imageFetchingDelegate,
source: i.imageResource.Source,
version: version,
resourceType: resourceType,
}
fetchSource, err := i.resourceFetcher.Fetch(
i.logger.Session("init-image"),
getSess,
i.workerTags,
i.teamID,
i.customTypes,
cacheID,
resource.EmptyMetadata{},
i.imageFetchingDelegate,
resourceOptions,
i.signals,
make(chan struct{}),
)
if err != nil {
i.logger.Debug("failed-to-fetch-image")
return nil, nil, nil, err
}
vesionedSource := fetchSource.VersionedSource()
volume := vesionedSource.Volume()
if volume == nil {
return nil, nil, nil, ErrImageGetDidNotProduceVolume
}
i.logger.Debug("created-volume-for-image", lager.Data{"handle": volume.Handle()})
volumeSpec := worker.VolumeSpec{
Strategy: worker.ContainerRootFSStrategy{
Parent: volume,
},
Privileged: i.privileged,
TTL: worker.ContainerTTL,
}
cowVolume, err := i.workerClient.CreateVolume(i.logger.Session("create-cow-volume"), volumeSpec, i.teamID)
if err != nil {
return nil, nil, nil, err
}
reader, err := vesionedSource.StreamOut(ImageMetadataFile)
if err != nil {
return nil, nil, nil, err
}
tarReader := tar.NewReader(reader)
_, err = tarReader.Next()
if err != nil {
return nil, nil, nil, fmt.Errorf("could not read file \"%s\" from tar", ImageMetadataFile)
}
releasingReader := &releasingReadCloser{
Reader: tarReader,
Closer: reader,
releaseFunc: func() { fetchSource.Release(nil) },
}
return cowVolume, releasingReader, version, nil
}
func (i *image) getLatestVersion() (atc.Version, error) {
checkSess := resource.Session{
ID: i.workerID,
Metadata: i.workerMetadata,
}
checkSess.ID.Stage = db.ContainerStageCheck
checkSess.ID.ImageResourceType = i.imageResource.Type
checkSess.ID.ImageResourceSource = i.imageResource.Source
checkSess.Metadata.Type = db.ContainerTypeCheck
checkSess.Metadata.WorkingDirectory = ""
checkSess.Metadata.EnvironmentVariables = nil
checkingResource, err := i.tracker.Init(
i.logger.Session("check-image"),
resource.EmptyMetadata{},
checkSess,
resource.ResourceType(i.imageResource.Type),
i.workerTags,
i.teamID,
i.customTypes,
i.imageFetchingDelegate,
)
if err != nil {
return nil, err
}
defer checkingResource.Release(nil)
versions, err := checkingResource.Check(i.imageResource.Source, nil)
if err != nil {
return nil, err
}
if len(versions) == 0 {
return nil, ErrImageUnavailable
}
return versions[0], nil
}
type leaseID struct {
Type resource.ResourceType `json:"type"`
Version atc.Version `json:"version"`
Source atc.Source `json:"source"`
WorkerName string `json:"worker_name"`
}
type imageResource struct {
imageFetchingDelegate worker.ImageFetchingDelegate
source atc.Source
version atc.Version
resourceType resource.ResourceType
}
func (d *imageResource) IOConfig() resource.IOConfig {
return resource.IOConfig{
Stderr: d.imageFetchingDelegate.Stderr(),
}
}
func (ir *imageResource) Source() atc.Source {
return ir.source
}
func (ir *imageResource) Params() atc.Params {
return nil
}
func (ir *imageResource) Version() atc.Version {
return ir.version
}
func (ir *imageResource) ResourceType() resource.ResourceType {
return ir.resourceType
}
func (ir *imageResource) LockName(workerName string) (string, error) {
id := &leaseID{
Type: ir.resourceType,
Version: ir.version,
Source: ir.source,
WorkerName: workerName,
}
taskNameJSON, err := json.Marshal(id)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", sha256.Sum256(taskNameJSON)), nil
}
type releasingReadCloser struct {
io.Reader
io.Closer
releaseFunc func()
}
func (r *releasingReadCloser) Close() error {
r.releaseFunc()
return r.Closer.Close()
}