uncloud-mravi/ucloud/imagescanner/main.py

92 lines
3.5 KiB
Python
Executable file

import json
import os
import subprocess
from os.path import join as join_path
from ucloud.config import etcd_client, config, image_storage_handler
from ucloud.imagescanner import logger
def qemu_img_type(path):
qemu_img_info_command = ["qemu-img", "info", "--output", "json", path]
try:
qemu_img_info = subprocess.check_output(qemu_img_info_command)
except Exception as e:
logger.exception(e)
return None
else:
qemu_img_info = json.loads(qemu_img_info.decode("utf-8"))
return qemu_img_info["format"]
def check():
""" check whether settings are sane, refuse to start if they aren't """
if config['storage']['backend'] == 'filesystem' and not isdir(config['storage']['image_dir']):
print("You have set STORAGE_BACKEND to filesystem, but "
"{} does not exist. Refusing to start".format(config['storage']['image_dir']))
sys.exit(1)
try:
subprocess.check_output(['which', 'qemu-img'])
except Exception:
print("qemu-img missing")
sys.exit(1)
def main():
# We want to get images entries that requests images to be created
images = etcd_client.get_prefix(config['etcd']['image_prefix'], value_in_json=True)
images_to_be_created = list(filter(lambda im: im.value['status'] == 'TO_BE_CREATED', images))
for image in images_to_be_created:
try:
image_uuid = image.key.split('/')[-1]
image_owner = image.value['owner']
image_filename = image.value['filename']
image_store_name = image.value['store_name']
image_full_path = join_path(config['storage']['file_dir'], image_owner, image_filename)
image_stores = etcd_client.get_prefix(config['etcd']['image_store_prefix'],
value_in_json=True)
user_image_store = next(filter(
lambda s, store_name=image_store_name: s.value["name"] == store_name,
image_stores
))
image_store_pool = user_image_store.value['attributes']['pool']
except Exception as e:
logger.exception(e)
else:
# At least our basic data is available
qemu_img_convert_command = ["qemu-img", "convert", "-f", "qcow2",
"-O", "raw", image_full_path, "image.raw"]
if qemu_img_type(image_full_path) == "qcow2":
try:
# Convert .qcow2 to .raw
subprocess.check_output(qemu_img_convert_command)
except Exception as e:
logger.exception(e)
else:
# Import and Protect
r_status = image_storage_handler.import_image(src="image.raw",
dest=image_uuid,
protect=True)
if r_status:
# Everything is successfully done
image.value["status"] = "CREATED"
etcd_client.put(image.key, json.dumps(image.value))
else:
# The user provided image is either not found or of invalid format
image.value["status"] = "INVALID_IMAGE"
etcd_client.put(image.key, json.dumps(image.value))
try:
os.remove("image.raw")
except Exception:
pass
if __name__ == "__main__":
main()