cinder.image.image_utils module

Helper methods to deal with images.

This is essentially a copy from nova.virt.images.py Some slight modifications, but at some point we should look at maybe pushing this up to Oslo

class TemporaryImages(image_service)

Bases: object

Manage temporarily downloaded images to avoid downloading it twice.

In the ‘with TemporaryImages.fetch(image_service, ctx, image_id) as tmp’ clause, ‘tmp’ can be used as the downloaded image path. In addition, image_utils.fetch() will use the pre-fetched image by the TemporaryImages. This is useful to inspect image contents before conversion.

classmethod fetch(image_service, context, image_id, suffix='')

static for_image_service(image_service)

get(context, image_id)

check_available_space(dest, image_size, image_id)

check_qemu_img_version(minimum_version)

check_virtual_size(virtual_size, volume_size, image_id)

cleanup_temporary_file(backend_name)

coalesce_chain(vhd_chain)

coalesce_vhd(vhd_path)

convert_image(source, dest, out_format, out_subformat=None, src_format=None, run_as_root=True, throttle=None, cipher_spec=None, passphrase_file=None, compress=False)

create_temporary_file(*args, **kwargs)

decode_cipher(cipher_spec, key_size)

Decode a dm-crypt style cipher specification string

The assumed format being cipher[:keycount]-chainmode-ivmode[:ivopts] as documented under linux/Documentation/device-mapper/dm-crypt.txt in the kernel source tree.

discover_vhd_chain(directory)

extract_targz(archive_name, target)

fetch(context, image_service, image_id, path, _user_id, _project_id)

fetch_to_raw(context, image_service, image_id, dest, blocksize, user_id=None, project_id=None, size=None, run_as_root=True)

fetch_to_vhd(context, image_service, image_id, dest, blocksize, volume_subformat=None, user_id=None, project_id=None, run_as_root=True)

fetch_to_volume_format(context, image_service, image_id, dest, volume_format, blocksize, volume_subformat=None, user_id=None, project_id=None, size=None, run_as_root=True)

fetch_verify_image(context, image_service, image_id, dest, user_id=None, project_id=None, size=None, run_as_root=True)

fix_vhd_chain(vhd_chain)

fixup_disk_format(disk_format)

Return the format to be provided to qemu-img convert.

from_qemu_img_disk_format(disk_format)

Return the conventional format derived from qemu-img format.

get_qemu_data(image_id, has_meta, disk_format_raw, dest, run_as_root, force_share=False)

get_qemu_img_version()

The qemu-img version will be cached until the process is restarted.

get_vhd_size(vhd_path)

is_xenserver_format(image_meta)

qemu_img_info(path, run_as_root=True, force_share=False)

Return an object containing the parsed output from qemu-img info.

qemu_img_supports_force_share()

replace_xenserver_image_with_coalesced_vhd(image_file)

resize_image(source, size, run_as_root=False)

Changes the virtual size of the image.

resize_vhd(vhd_path, size, journal)

set_vhd_parent(vhd_path, parentpath)

temporary_dir()

temporary_file(*args, **kwargs)

upload_volume(context, image_service, image_meta, volume_path, volume_format='raw', run_as_root=True, compress=True)

verify_glance_image_signature(context, image_service, image_id, path)