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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
}
}
}
|
