summaryrefslogtreecommitdiff
path: root/pkg/api/handlers/libpod/images_pull.go
blob: 5e2727e959f16df26c11cf1f63e69992ca3c647d (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
package libpod

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"

	"github.com/containers/image/v5/docker"
	"github.com/containers/image/v5/docker/reference"
	"github.com/containers/image/v5/types"
	"github.com/containers/podman/v2/libpod"
	"github.com/containers/podman/v2/libpod/image"
	"github.com/containers/podman/v2/pkg/api/handlers/utils"
	"github.com/containers/podman/v2/pkg/auth"
	"github.com/containers/podman/v2/pkg/channel"
	"github.com/containers/podman/v2/pkg/domain/entities"
	"github.com/containers/podman/v2/pkg/util"
	"github.com/gorilla/schema"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// ImagesPull is the v2 libpod endpoint for pulling images.  Note that the
// mandatory `reference` must be a reference to a registry (i.e., of docker
// transport or be normalized to one).  Other transports are rejected as they
// do not make sense in a remote context.
func ImagesPull(w http.ResponseWriter, r *http.Request) {
	runtime := r.Context().Value("runtime").(*libpod.Runtime)
	decoder := r.Context().Value("decoder").(*schema.Decoder)
	query := struct {
		Reference       string `schema:"reference"`
		OverrideOS      string `schema:"overrideOS"`
		OverrideArch    string `schema:"overrideArch"`
		OverrideVariant string `schema:"overrideVariant"`
		TLSVerify       bool   `schema:"tlsVerify"`
		AllTags         bool   `schema:"allTags"`
	}{
		TLSVerify: true,
	}

	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
		return
	}

	if len(query.Reference) == 0 {
		utils.InternalServerError(w, errors.New("reference parameter cannot be empty"))
		return
	}

	imageRef, err := utils.ParseDockerReference(query.Reference)
	if err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, err)
		return
	}

	// Trim the docker-transport prefix.
	rawImage := strings.TrimPrefix(query.Reference, fmt.Sprintf("%s://", docker.Transport.Name()))

	// all-tags doesn't work with a tagged reference, so let's check early
	namedRef, err := reference.Parse(rawImage)
	if err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Wrapf(err, "error parsing reference %q", rawImage))
		return
	}
	if _, isTagged := namedRef.(reference.Tagged); isTagged && query.AllTags {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Errorf("reference %q must not have a tag for all-tags", rawImage))
		return
	}

	authConf, authfile, key, err := auth.GetCredentials(r)
	if err != nil {
		utils.Error(w, "failed to retrieve repository credentials", http.StatusBadRequest, errors.Wrapf(err, "failed to parse %q header for %s", key, r.URL.String()))
		return
	}
	defer auth.RemoveAuthfile(authfile)

	// Setup the registry options
	dockerRegistryOptions := image.DockerRegistryOptions{
		DockerRegistryCreds: authConf,
		OSChoice:            query.OverrideOS,
		ArchitectureChoice:  query.OverrideArch,
		VariantChoice:       query.OverrideVariant,
	}
	if _, found := r.URL.Query()["tlsVerify"]; found {
		dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!query.TLSVerify)
	}

	sys := runtime.SystemContext()
	if sys == nil {
		sys = image.GetSystemContext("", authfile, false)
	}
	dockerRegistryOptions.DockerCertPath = sys.DockerCertPath
	sys.DockerAuthConfig = authConf

	// Prepare the images we want to pull
	imagesToPull := []string{}
	imageName := namedRef.String()

	if !query.AllTags {
		imagesToPull = append(imagesToPull, imageName)
	} else {
		tags, err := docker.GetRepositoryTags(context.Background(), sys, imageRef)
		if err != nil {
			utils.InternalServerError(w, errors.Wrap(err, "error getting repository tags"))
			return
		}
		for _, tag := range tags {
			imagesToPull = append(imagesToPull, fmt.Sprintf("%s:%s", imageName, tag))
		}
	}

	writer := channel.NewWriter(make(chan []byte, 1))
	defer writer.Close()

	stderr := channel.NewWriter(make(chan []byte, 1))
	defer stderr.Close()

	images := make([]string, 0, len(imagesToPull))
	runCtx, cancel := context.WithCancel(context.Background())
	go func(imgs []string) {
		defer cancel()
		// Finally pull the images
		for _, img := range imgs {
			newImage, err := runtime.ImageRuntime().New(
				runCtx,
				img,
				"",
				authfile,
				writer,
				&dockerRegistryOptions,
				image.SigningOptions{},
				nil,
				util.PullImageAlways)
			if err != nil {
				stderr.Write([]byte(err.Error() + "\n"))
			} else {
				images = append(images, newImage.ID())
			}
		}
	}(imagesToPull)

	flush := func() {
		if flusher, ok := w.(http.Flusher); ok {
			flusher.Flush()
		}
	}

	w.WriteHeader(http.StatusOK)
	w.Header().Add("Content-Type", "application/json")
	flush()

	enc := json.NewEncoder(w)
	enc.SetEscapeHTML(true)
	var failed bool
loop: // break out of for/select infinite loop
	for {
		var report entities.ImagePullReport
		select {
		case e := <-writer.Chan():
			report.Stream = string(e)
			if err := enc.Encode(report); err != nil {
				stderr.Write([]byte(err.Error()))
			}
			flush()
		case e := <-stderr.Chan():
			failed = true
			report.Error = string(e)
			if err := enc.Encode(report); err != nil {
				logrus.Warnf("Failed to json encode error %q", err.Error())
			}
			flush()
		case <-runCtx.Done():
			if !failed {
				// Send all image id's pulled in 'images' stanza
				report.Images = images
				if err := enc.Encode(report); err != nil {
					logrus.Warnf("Failed to json encode error %q", err.Error())
				}

				report.Images = nil
				// Pull last ID from list and publish in 'id' stanza.  This maintains previous API contract
				report.ID = images[len(images)-1]
				if err := enc.Encode(report); err != nil {
					logrus.Warnf("Failed to json encode error %q", err.Error())
				}

				flush()
			}
			break loop // break out of for/select infinite loop
		case <-r.Context().Done():
			// Client has closed connection
			break loop // break out of for/select infinite loop
		}
	}
}