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package images
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"strconv"
"github.com/containers/image/v5/types"
"github.com/containers/podman/v2/pkg/auth"
"github.com/containers/podman/v2/pkg/bindings"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/hashicorp/go-multierror"
)
// Pull is the binding for libpod's v2 endpoints for pulling images. Note that
// `rawImage` 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. Progress reported on stderr
func Pull(ctx context.Context, rawImage string, options entities.ImagePullOptions) ([]string, error) {
conn, err := bindings.GetClient(ctx)
if err != nil {
return nil, err
}
params := url.Values{}
params.Set("reference", rawImage)
params.Set("overrideArch", options.OverrideArch)
params.Set("overrideOS", options.OverrideOS)
params.Set("overrideVariant", options.OverrideVariant)
if options.SkipTLSVerify != types.OptionalBoolUndefined {
// Note: we have to verify if skipped is false.
verifyTLS := bool(options.SkipTLSVerify == types.OptionalBoolFalse)
params.Set("tlsVerify", strconv.FormatBool(verifyTLS))
}
params.Set("allTags", strconv.FormatBool(options.AllTags))
// TODO: have a global system context we can pass around (1st argument)
header, err := auth.Header(nil, auth.XRegistryAuthHeader, options.Authfile, options.Username, options.Password)
if err != nil {
return nil, err
}
response, err := conn.DoRequest(nil, http.MethodPost, "/images/pull", params, header)
if err != nil {
return nil, err
}
defer response.Body.Close()
if !response.IsSuccess() {
return nil, response.Process(err)
}
// Historically pull writes status to stderr
stderr := io.Writer(os.Stderr)
if options.Quiet {
stderr = ioutil.Discard
}
dec := json.NewDecoder(response.Body)
var images []string
var mErr error
for {
var report entities.ImagePullReport
if err := dec.Decode(&report); err != nil {
if errors.Is(err, io.EOF) {
break
}
report.Error = err.Error() + "\n"
}
select {
case <-response.Request.Context().Done():
return images, mErr
default:
// non-blocking select
}
switch {
case report.Stream != "":
fmt.Fprint(stderr, report.Stream)
case report.Error != "":
mErr = multierror.Append(mErr, errors.New(report.Error))
case len(report.Images) > 0:
images = report.Images
case report.ID != "":
default:
return images, errors.New("failed to parse pull results stream, unexpected input")
}
}
return images, mErr
}
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