Method createContainerLogSymlink

core/logs.go:162–203

createContainerLogSymlink creates the symlink for docker container log.

(containerID string)

// createContainerLogSymlink creates the symlink for docker container log.
func (ds *dockerService) createContainerLogSymlink(containerID string) error {
	path, realPath, err := ds.getContainerLogPath(containerID)
	if err != nil {
		return fmt.Errorf("failed to get container %q log path: %v", containerID, err)
	}

	if path == "" {
		logrus.Debugf("Container log path for Container ID %s isn't specified, will not create symlink", containerID)
		return nil
	}

	if realPath != "" {
		// Only create the symlink when container log path is specified and log file exists.
		// Delete possibly existing file first
		if err = ds.os.Remove(path); err == nil {
			logrus.Debugf("Deleted previously existing symlink file: %s", path)
		}
		if err = ds.os.Symlink(realPath, path); err != nil {
			return fmt.Errorf(
				"failed to create symbolic link %q to the container log file %q for container %q: %v",
				path,
				realPath,
				containerID,
				err,
			)
		}
	} else {
		supported, err := ds.IsCRISupportedLogDriver()
		if err != nil {
			logrus.Errorf("Failed to check supported logging driver for CRI: %v", err)
			return nil
		}

		if supported {
			logrus.Info("Cannot create symbolic link because container log file doesn't exist!")
		} else {
			logrus.Debug("Unsupported logging driver by CRI")
		}
	}

	return nil
}

// removeContainerLogSymlink removes the symlink for docker container log.
func (ds *dockerService) removeContainerLogSymlink(containerID string) error {