diff options
Diffstat (limited to 'src/virtBootstrap/sources.py')
| -rw-r--r-- | src/virtBootstrap/sources.py | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/src/virtBootstrap/sources.py b/src/virtBootstrap/sources.py index a9c3939..0992704 100644 --- a/src/virtBootstrap/sources.py +++ b/src/virtBootstrap/sources.py @@ -116,27 +116,25 @@ def format_number(number): return(fmt % (number or 0, symbols[depth])) -def get_layer_info(digest, image_dir): +def log_layer_extract(layer, current, total): """ - Get checksum type/value and path to corresponding tarball. + Create log message on layer extract. """ - sum_type, sum_value = digest.split(':') - layer_file = "{}/{}.tar".format(image_dir, sum_value) - return (sum_type, sum_value, layer_file) + sum_type, sum_value, layer_file, layer_size = layer + logger.info("Extracting layer (%s/%s) with size: %s", + current, total, format_number(layer_size)) + logger.debug('Untar layer: (%s:%s) %s', sum_type, sum_value, layer_file) -def untar_layers(layers_list, image_dir, dest_dir): +def untar_layers(layers_list, dest_dir): """ Untar each of layers from container image. """ + nlayers = len(layers_list) for index, layer in enumerate(layers_list): - logger.info("Extracting layer (%s/%s) with size: %s", - index+1, len(layers_list), format_number(layer['size'])) - - sum_type, sum_value, layer_file = get_layer_info(layer['digest'], - image_dir) - logger.debug('Untar layer file: (%s) %s', sum_type, layer_file) + log_layer_extract(layer, index + 1, nlayers) + sum_type, sum_value, layer_file, _ignore = layer # Verify the checksum if not checksum(layer_file, sum_type, sum_value): raise Exception("Digest not matching: " + layer['digest']) @@ -203,22 +201,17 @@ def create_qcow2(tar_file, layer_file, backing_file=None, size=DEF_QCOW2_SIZE): execute(tar_in_cmd) -def extract_layers_in_qcow2(layers_list, image_dir, dest_dir): +def extract_layers_in_qcow2(layers_list, dest_dir): """ Extract docker layers in qcow2 images with backing chains. """ qcow2_backing_file = None + nlayers = len(layers_list) for index, layer in enumerate(layers_list): - logger.info("Extracting layer (%s/%s) with size: %s", - index+1, len(layers_list), format_number(layer['size'])) - - # Get layer file information - sum_type, sum_value, tar_file = get_layer_info(layer['digest'], - image_dir) - - logger.debug('Untar layer file: (%s) %s', sum_type, tar_file) + log_layer_extract(layer, index + 1, nlayers) + sum_type, sum_value, tar_file, _ignore = layer # Verify the checksum if not checksum(tar_file, sum_type, sum_value): raise Exception("Digest not matching: " + layer['digest']) @@ -302,6 +295,7 @@ class DockerSource(object): Extract files from Docker image """ + # pylint: disable=too-many-instance-attributes def __init__(self, **kwargs): """ Bootstrap root filesystem from Docker registry @@ -333,9 +327,17 @@ class DockerSource(object): self.url = "docker://" + registry + image self.images_dir = get_image_dir(self.no_cache) + # Retrive manifest from registry self.manifest = get_image_details(self.url, raw=True) + # Get layers' digest, sum_type, size and file_path in a list + self.layers = [] + for layer in self.manifest['layers']: + sum_type, layer_sum = layer['digest'].split(':') + file_path = os.path.join(self.images_dir, layer_sum + '.tar') + self.layers.append([sum_type, layer_sum, file_path, layer['size']]) + def unpack(self, dest): """ Extract image files from Docker image @@ -367,11 +369,10 @@ class DockerSource(object): # https://github.com/containers/image/blob/master/image/oci.go#L100 if self.output_format == 'dir': logger.info("Extracting container layers") - untar_layers(self.manifest['layers'], self.images_dir, dest) + untar_layers(self.layers, dest) elif self.output_format == 'qcow2': logger.info("Extracting container layers into qcow2 images") - extract_layers_in_qcow2(self.manifest['layers'], - self.images_dir, dest) + extract_layers_in_qcow2(self.layers, dest) else: raise Exception("Unknown format:" + self.output_format) |