/usr/share/pyshared/juju/unit/charm.py is in juju-0.7 0.7-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | import os
import shutil
from twisted.internet.defer import inlineCallbacks, returnValue
from twisted.web.client import downloadPage
from twisted.web.error import Error
from juju.errors import FileNotFound
from juju.charm.bundle import CharmBundle
from juju.lib import under
from juju.state.charm import CharmStateManager
@inlineCallbacks
def download_charm(client, charm_id, charms_directory):
"""Retrieve a charm from the provider storage to the local machine.
"""
charm_state_manager = CharmStateManager(client)
charm_state = yield charm_state_manager.get_charm_state(charm_id)
# Calculate local charm path
checksum = yield charm_state.get_sha256()
charm_key = under.quote("%s:%s" % (charm_state.id, checksum))
local_charm_path = os.path.join(
charms_directory, charm_key)
# Retrieve charm from provider storage link
if charm_state.bundle_url.startswith("file://"):
file_path = charm_state.bundle_url[len("file://"):]
if not os.path.exists(file_path):
raise FileNotFound(charm_state.bundle_url)
shutil.copyfileobj(open(file_path), open(local_charm_path, "w"))
else:
try:
yield downloadPage(charm_state.bundle_url, local_charm_path)
except Error:
raise FileNotFound(charm_state.bundle_url)
returnValue(CharmBundle(local_charm_path))
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