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package libpod
import (
"context"
"encoding/json"
"net/http"
"github.com/containers/common/libimage"
"github.com/containers/common/pkg/config"
"github.com/containers/image/v5/types"
"github.com/containers/podman/v3/libpod"
"github.com/containers/podman/v3/pkg/api/handlers/utils"
"github.com/containers/podman/v3/pkg/auth"
"github.com/containers/podman/v3/pkg/channel"
"github.com/containers/podman/v3/pkg/domain/entities"
"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"`
OS string `schema:"OS"`
Arch string `schema:"Arch"`
Variant string `schema:"Variant"`
TLSVerify bool `schema:"tlsVerify"`
AllTags bool `schema:"allTags"`
PullPolicy string `schema:"policy"`
}{
TLSVerify: true,
PullPolicy: "always",
}
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
}
// Make sure that the reference has no transport or the docker one.
if err := utils.IsRegistryReference(query.Reference); err != nil {
utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, err)
return
}
pullOptions := &libimage.PullOptions{}
pullOptions.AllTags = query.AllTags
pullOptions.Architecture = query.Arch
pullOptions.OS = query.OS
pullOptions.Variant = query.Variant
if _, found := r.URL.Query()["tlsVerify"]; found {
pullOptions.InsecureSkipTLSVerify = types.NewOptionalBool(!query.TLSVerify)
}
// Do the auth dance.
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)
pullOptions.AuthFilePath = authfile
if authConf != nil {
pullOptions.Username = authConf.Username
pullOptions.Password = authConf.Password
pullOptions.IdentityToken = authConf.IdentityToken
}
writer := channel.NewWriter(make(chan []byte))
defer writer.Close()
pullOptions.Writer = writer
pullPolicy, err := config.ParsePullPolicy(query.PullPolicy)
if err != nil {
utils.Error(w, "failed to parse pull policy", http.StatusBadRequest, err)
return
}
var pulledImages []*libimage.Image
var pullError error
runCtx, cancel := context.WithCancel(r.Context())
go func() {
defer cancel()
pulledImages, pullError = runtime.LibimageRuntime().Pull(runCtx, query.Reference, pullPolicy, pullOptions)
}()
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)
for {
var report entities.ImagePullReport
select {
case s := <-writer.Chan():
report.Stream = string(s)
if err := enc.Encode(report); err != nil {
logrus.Warnf("Failed to encode json: %v", err)
}
flush()
case <-runCtx.Done():
for _, image := range pulledImages {
report.Images = append(report.Images, image.ID())
// Pull last ID from list and publish in 'id' stanza. This maintains previous API contract
report.ID = image.ID()
}
if pullError != nil {
report.Error = pullError.Error()
}
if err := enc.Encode(report); err != nil {
logrus.Warnf("Failed to encode json: %v", err)
}
flush()
return
case <-r.Context().Done():
// Client has closed connection
return
}
}
}
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