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package logger
import (
// Factory defines methods a factory should implement, to create a Logger
// based on the specified container, image or service name.
type Factory interface {
CreateContainerLogger(name string) Logger
CreateBuildLogger(name string) Logger
CreatePullLogger(name string) Logger
// Logger defines methods to implement for being a logger.
type Logger interface {
Out(bytes []byte)
Err(bytes []byte)
OutWriter() io.Writer
ErrWriter() io.Writer
// Wrapper is a wrapper around Logger that implements the Writer interface,
// mainly use by docker/pkg/stdcopy functions.
type Wrapper struct {
Err bool
Logger Logger
func (l *Wrapper) Write(bytes []byte) (int, error) {
if l.Err {
} else {
return len(bytes), nil
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