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package tarball
import (
"errors"
"fmt"
"io"
"os"
"strings"
"github.com/containers/image/v5/transports"
"github.com/containers/image/v5/types"
)
const (
transportName = "tarball"
separator = ":"
)
var (
// Transport implements the types.ImageTransport interface for "tarball:" images,
// which are makeshift images constructed using one or more possibly-compressed tar
// archives.
Transport = &tarballTransport{}
)
type tarballTransport struct {
}
func (t *tarballTransport) Name() string {
return transportName
}
func (t *tarballTransport) ParseReference(reference string) (types.ImageReference, error) {
var stdin []byte
var err error
filenames := strings.Split(reference, separator)
for _, filename := range filenames {
if filename == "-" {
stdin, err = io.ReadAll(os.Stdin)
if err != nil {
return nil, fmt.Errorf("error buffering stdin: %v", err)
}
continue
}
f, err := os.Open(filename)
if err != nil {
return nil, fmt.Errorf("error opening %q: %v", filename, err)
}
f.Close()
}
return NewReference(filenames, stdin)
}
// NewReference creates a new "tarball:" reference for the listed fileNames.
// If any of the fileNames is "-", the contents of stdin are used instead.
func NewReference(fileNames []string, stdin []byte) (types.ImageReference, error) {
for _, path := range fileNames {
if strings.Contains(path, separator) {
return nil, fmt.Errorf("Invalid path %q: paths including the separator %q are not supported", path, separator)
}
}
return &tarballReference{
filenames: fileNames,
stdin: stdin,
}, nil
}
func (t *tarballTransport) ValidatePolicyConfigurationScope(scope string) error {
// See the explanation in daemonReference.PolicyConfigurationIdentity.
return errors.New(`tarball: does not support any scopes except the default "" one`)
}
func init() {
transports.Register(Transport)
}
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