def image_to_raw(image_href, path, path_tmp):
with fileutils.remove_path_on_error(path_tmp):
data = qemu_img_info(path_tmp)
fmt = data.file_format
if fmt is None:
raise exception.ImageUnacceptable(
reason=_("'qemu-img info' parsing failed."),
image_id=image_href)
backing_file = data.backing_file
if backing_file is not None:
raise exception.ImageUnacceptable(image_id=image_href,
reason=_("fmt=%(fmt)s backed by: %(backing_file)s") %
{'fmt': fmt,
'backing_file': backing_file})
if fmt != "raw" and CONF.force_raw_images:
staged = "%s.converted" % path
LOG.debug(_("%(image)s was %(format)s, converting to raw") %
{'image': image_href, 'format': fmt})
with fileutils.remove_path_on_error(staged):
convert_image(path_tmp, staged, 'raw')
os.unlink(path_tmp)
data = qemu_img_info(staged)
if data.file_format != "raw":
raise exception.ImageConvertFailed(image_id=image_href,
reason=_("Converted to raw, but format is now %s") %
data.file_format)
os.rename(staged, path)
else:
os.rename(path_tmp, path)
def image_to_raw(image_href, path, path_tmp):
with fileutils.remove_path_on_error(path_tmp):
data = qemu_img_info(path_tmp)
fmt = data.file_format
if fmt is None:
raise exception.ImageUnacceptable(
reason=_("'qemu-img info' parsing failed."),
image_id=image_href)
backing_file = data.backing_file
if backing_file is not None:
raise exception.ImageUnacceptable(image_id=image_href,
reason=_("fmt=%(fmt)s backed by: %(backing_file)s") %
{'fmt': fmt,
'backing_file': backing_file})
if fmt != "raw":
staged = "%s.converted" % path
LOG.debug("%(image)s was %(format)s, converting to raw" %
{'image': image_href, 'format': fmt})
with fileutils.remove_path_on_error(staged):
convert_image(path_tmp, staged, 'raw')
os.unlink(path_tmp)
data = qemu_img_info(staged)
if data.file_format != "raw":
raise exception.ImageConvertFailed(image_id=image_href,
reason=_("Converted to raw, but format is now %s") %
data.file_format)
os.rename(staged, path)
else:
os.rename(path_tmp, path)
def fetch(context, image_href, path, image_service=None):
# TODO(vish): Improve context handling and add owner and auth data
# when it is added to glance. Right now there is no
# auth checking in glance, so we assume that access was
# checked before we got here.
if not image_service:
image_service = service.Service(version=1, context=context)
with fileutils.remove_path_on_error(path):
with open(path, "wb") as image_file:
image_service.download(image_href, image_file)
def fetch(context, image_href, path, image_service=None):
# TODO(vish): Improve context handling and add owner and auth data
# when it is added to glance. Right now there is no
# auth checking in glance, so we assume that access was
# checked before we got here.
if not image_service:
image_service = service.Service(version=1, context=context)
with fileutils.remove_path_on_error(path):
with open(path, "wb") as image_file:
image_service.download(image_href, image_file)
def fetch(context, image_href, path, force_raw=False):
# TODO(vish): Improve context handling and add owner and auth data
# when it is added to glance. Right now there is no
# auth checking in glance, so we assume that access was
# checked before we got here.
image_service = service.get_image_service(image_href,
context=context)
LOG.debug("Using %(image_service)s to download image %(image_href)s." %
{'image_service': image_service.__class__,
'image_href': image_href})
with fileutils.remove_path_on_error(path):
with open(path, "wb") as image_file:
image_service.download(image_href, image_file)
if force_raw:
image_to_raw(image_href, path, "%s.part" % path)
def fetch(context, image_href, path, image_service=None, force_raw=False):
# TODO(vish): Improve context handling and add owner and auth data
# when it is added to glance. Right now there is no
# auth checking in glance, so we assume that access was
# checked before we got here.
if not image_service:
image_service = service.get_image_service(image_href, context=context)
LOG.debug("Using %(image_service)s to download image %(image_href)s." %
{
'image_service': image_service.__class__,
'image_href': image_href
})
with fileutils.remove_path_on_error(path):
with open(path, "wb") as image_file:
image_service.download(image_href, image_file)
if force_raw:
image_to_raw(image_href, path, "%s.part" % path)
def _get_image(ctx, path, uuid, master_path=None, image_service=None):
#TODO(ghe): Revise this logic and cdocument process Bug #1199665
# When master_path defined, we save the images in this dir using the iamge
# uuid as the file name. Deployments that use this images, creates a hard
# link to keep track of this. When the link count of a master image is
# equal to 1, can be deleted.
#TODO(ghe): have hard links and count links the same behaviour in all fs
#TODO(ghe): timeout and retry for downloads
def _wait_for_download():
if not os.path.exists(lock_file):
raise loopingcall.LoopingCallDone()
# If the download of the image needed is in progress (lock file present)
# we wait until the locks disappears and create the link.
if master_path is None:
#NOTE(ghe): We don't share images between instances/hosts
images.fetch_to_raw(ctx, uuid, path, image_service)
else:
master_uuid = os.path.join(master_path,
service_utils.parse_image_ref(uuid)[0])
lock_file = os.path.join(master_path, master_uuid + '.lock')
_link_master_image(master_uuid, path)
if not os.path.exists(path):
fileutils.ensure_tree(master_path)
if not _download_in_progress(lock_file):
with fileutils.remove_path_on_error(lock_file):
#TODO(ghe): logging when image cannot be created
fd, tmp_path = tempfile.mkstemp(dir=master_path)
os.close(fd)
images.fetch_to_raw(ctx, uuid, tmp_path, image_service)
_create_master_image(tmp_path, master_uuid, path)
_remove_download_in_progress_lock(lock_file)
else:
#TODO(ghe): expiration time
timer = loopingcall.FixedIntervalLoopingCall(
_wait_for_download)
timer.start(interval=1).wait()
_link_master_image(master_uuid, path)
def _get_image(ctx, path, uuid, master_path=None, image_service=None):
#TODO(ghe): Revise this logic and cdocument process Bug #1199665
# When master_path defined, we save the images in this dir using the iamge
# uuid as the file name. Deployments that use this images, creates a hard
# link to keep track of this. When the link count of a master image is
# equal to 1, can be deleted.
#TODO(ghe): have hard links and count links the same behaviour in all fs
#TODO(ghe): timeout and retry for downloads
def _wait_for_download():
if not os.path.exists(lock_file):
raise loopingcall.LoopingCallDone()
# If the download of the image needed is in progress (lock file present)
# we wait until the locks disappears and create the link.
if master_path is None:
#NOTE(ghe): We don't share images between instances/hosts
images.fetch_to_raw(ctx, uuid, path, image_service)
else:
master_uuid = os.path.join(master_path,
service_utils.parse_image_ref(uuid)[0])
lock_file = os.path.join(master_path, master_uuid + '.lock')
_link_master_image(master_uuid, path)
if not os.path.exists(path):
fileutils.ensure_tree(master_path)
if not _download_in_progress(lock_file):
with fileutils.remove_path_on_error(lock_file):
#TODO(ghe): logging when image cannot be created
fd, tmp_path = tempfile.mkstemp(dir=master_path)
os.close(fd)
images.fetch_to_raw(ctx, uuid, tmp_path, image_service)
_create_master_image(tmp_path, master_uuid, path)
_remove_download_in_progress_lock(lock_file)
else:
#TODO(ghe): expiration time
timer = loopingcall.FixedIntervalLoopingCall(
_wait_for_download)
timer.start(interval=1).wait()
_link_master_image(master_uuid, path)
