summaryrefslogtreecommitdiff
path: root/libpod/images/image_data.go
blob: b64ac557faf19ba8a8f5ca0f8b01bddfe7343b71 (plain)
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
package images

import (
	"encoding/json"
	"time"

	"github.com/containers/image/docker/reference"
	is "github.com/containers/image/storage"
	"github.com/containers/image/transports"
	"github.com/containers/image/types"
	"github.com/containers/storage"
	digest "github.com/opencontainers/go-digest"
	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
	"github.com/pkg/errors"
	"github.com/projectatomic/libpod/libpod/driver"
)

// Data handles the data used when inspecting a container
// nolint
type Data struct {
	ID           string
	Tags         []string
	Digests      []string
	Digest       digest.Digest
	Comment      string
	Created      *time.Time
	Container    string
	Author       string
	Config       ociv1.ImageConfig
	Architecture string
	OS           string
	Annotations  map[string]string
	CreatedBy    string
	Size         uint
	VirtualSize  uint
	GraphDriver  driver.Data
	RootFS       ociv1.RootFS
}

// ParseImageNames parses the names we've stored with an image into a list of
// tagged references and a list of references which contain digests.
func ParseImageNames(names []string) (tags, digests []string, err error) {
	for _, name := range names {
		if named, err := reference.ParseNamed(name); err == nil {
			if digested, ok := named.(reference.Digested); ok {
				canonical, err := reference.WithDigest(named, digested.Digest())
				if err == nil {
					digests = append(digests, canonical.String())
				}
			} else {
				if reference.IsNameOnly(named) {
					named = reference.TagNameOnly(named)
				}
				if tagged, ok := named.(reference.Tagged); ok {
					namedTagged, err := reference.WithTag(named, tagged.Tag())
					if err == nil {
						tags = append(tags, namedTagged.String())
					}
				}
			}
		}
	}
	return tags, digests, nil
}

func annotations(manifest []byte, manifestType string) map[string]string {
	annotations := make(map[string]string)
	switch manifestType {
	case ociv1.MediaTypeImageManifest:
		var m ociv1.Manifest
		if err := json.Unmarshal(manifest, &m); err == nil {
			for k, v := range m.Annotations {
				annotations[k] = v
			}
		}
	}
	return annotations
}

// GetData gets the Data for a container with the given name in the given store.
func GetData(store storage.Store, name string) (*Data, error) {
	img, err := FindImage(store, name)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading image %q", name)
	}

	imgRef, err := FindImageRef(store, "@"+img.ID)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading image %q", img.ID)
	}
	defer imgRef.Close()

	tags, digests, err := ParseImageNames(img.Names)
	if err != nil {
		return nil, errors.Wrapf(err, "error parsing image names for %q", name)
	}

	driverName, err := driver.GetDriverName(store)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading name of storage driver")
	}

	topLayerID := img.TopLayer

	driverMetadata, err := driver.GetDriverMetadata(store, topLayerID)
	if err != nil {
		return nil, errors.Wrapf(err, "error asking storage driver %q for metadata", driverName)
	}

	layer, err := store.Layer(topLayerID)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading information about layer %q", topLayerID)
	}
	size, err := store.DiffSize(layer.Parent, layer.ID)
	if err != nil {
		return nil, errors.Wrapf(err, "error determining size of layer %q", layer.ID)
	}

	imgSize, err := imgRef.Size()
	if err != nil {
		return nil, errors.Wrapf(err, "error determining size of image %q", transports.ImageName(imgRef.Reference()))
	}

	manifest, manifestType, err := imgRef.Manifest()
	if err != nil {
		return nil, errors.Wrapf(err, "error reading manifest for image %q", img.ID)
	}
	manifestDigest := digest.Digest("")
	if len(manifest) > 0 {
		manifestDigest = digest.Canonical.FromBytes(manifest)
	}
	annotations := annotations(manifest, manifestType)

	config, err := imgRef.OCIConfig()
	if err != nil {
		return nil, errors.Wrapf(err, "error reading image configuration for %q", img.ID)
	}
	historyComment := ""
	historyCreatedBy := ""
	if len(config.History) > 0 {
		historyComment = config.History[len(config.History)-1].Comment
		historyCreatedBy = config.History[len(config.History)-1].CreatedBy
	}

	return &Data{
		ID:           img.ID,
		Tags:         tags,
		Digests:      digests,
		Digest:       manifestDigest,
		Comment:      historyComment,
		Created:      config.Created,
		Author:       config.Author,
		Config:       config.Config,
		Architecture: config.Architecture,
		OS:           config.OS,
		Annotations:  annotations,
		CreatedBy:    historyCreatedBy,
		Size:         uint(size),
		VirtualSize:  uint(size + imgSize),
		GraphDriver: driver.Data{
			Name: driverName,
			Data: driverMetadata,
		},
		RootFS: config.RootFS,
	}, nil
}

// FindImage searches for a *storage.Image with a matching the given name or ID in the given store.
func FindImage(store storage.Store, image string) (*storage.Image, error) {
	var img *storage.Image
	ref, err := is.Transport.ParseStoreReference(store, image)
	if err == nil {
		img, err = is.Transport.GetStoreImage(store, ref)
	}
	if err != nil {
		img2, err2 := store.Image(image)
		if err2 != nil {
			if ref == nil {
				return nil, errors.Wrapf(err, "error parsing reference to image %q", image)
			}
			return nil, errors.Wrapf(err, "unable to locate image %q", image)
		}
		img = img2
	}
	return img, nil
}

// FindImageRef searches for and returns a new types.Image matching the given name or ID in the given store.
func FindImageRef(store storage.Store, image string) (types.Image, error) {
	img, err := FindImage(store, image)
	if err != nil {
		return nil, errors.Wrapf(err, "unable to locate image %q", image)
	}
	ref, err := is.Transport.ParseStoreReference(store, "@"+img.ID)
	if err != nil {
		return nil, errors.Wrapf(err, "error parsing reference to image %q", img.ID)
	}
	imgRef, err := ref.NewImage(nil)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading image %q", img.ID)
	}
	return imgRef, nil
}