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import logging
import os
import re
import shlex
import shutil
import subprocess
import tempfile
import requests
import yaml
from charmworldlib.bundle import Bundle
log = logging.getLogger(__name__)
REQUEST_TIMEOUT_SECS = 45
def get(*args, **kw):
if 'timeout' not in kw:
kw['timeout'] = REQUEST_TIMEOUT_SECS
return requests.get(*args, **kw)
def rename(dir_):
"""If ``dir_`` is a charm directory, rename it to match the
charm name, otherwise do nothing.
:param dir_: directory path
:return: the new directory name (possibly unchanged).
"""
dir_ = dir_.rstrip(os.sep)
metadata = os.path.join(dir_, "metadata.yaml")
if not os.path.exists(metadata):
return dir_
metadata = yaml.safe_load(open(metadata))
name = metadata.get("name")
if not name:
return dir_
new_dir = os.path.join(os.path.dirname(dir_), name)
if not os.path.exists(new_dir):
# This ignores existing repos
# In truth we want control over management of existing
# repos with per VCS branch selections
# ex: switching the git branch marked in revision
os.rename(dir_, new_dir)
return new_dir
class Fetcher(object):
def __init__(self, url, **kw):
self.revision = ''
self.url = url
for k, v in kw.items():
setattr(self, k, v)
@classmethod
def can_fetch(cls, url):
match = cls.MATCH.search(url)
return match.groupdict() if match else {}
def get_revision(self, dir_):
dirlist = os.listdir(dir_)
if '.bzr' in dirlist:
rev_info = check_output('bzr revision-info', cwd=dir_)
return rev_info.split()[1]
elif '.git' in dirlist:
return check_output('git rev-parse HEAD', cwd=dir_)
elif '.hg' in dirlist:
return check_output(
"hg log -l 1 --template '{node}\n' -r .", cwd=dir_)
else:
return self.revision
class BzrFetcher(Fetcher):
MATCH = re.compile(r"""
^(lp:|launchpad:|https?://((code|www)\.)?launchpad.net/)
(?P<repo>[^@]*)(@(?P<revision>.*))?$
""", re.VERBOSE)
@classmethod
def can_fetch(cls, url):
matchdict = super(BzrFetcher, cls).can_fetch(url)
return matchdict if '/+merge/' not in matchdict.get('repo', '') else {}
def fetch(self, dir_):
dir_ = tempfile.mkdtemp(dir=dir_)
url = 'lp:' + self.repo
cmd = 'branch --use-existing-dir {} {}'.format(url, dir_)
if self.revision:
cmd = '{} -r {}'.format(cmd, self.revision)
bzr(cmd)
return rename(dir_)
class BzrMergeProposalFetcher(BzrFetcher):
@classmethod
def can_fetch(cls, url):
matchdict = super(BzrFetcher, cls).can_fetch(url)
return matchdict if '/+merge/' in matchdict.get('repo', '') else {}
def fetch(self, dir_):
dir_ = tempfile.mkdtemp(dir=dir_)
api_base = 'https://api.launchpad.net/devel/'
url = api_base + self.repo
merge_data = get(url).json()
target = 'lp:' + merge_data['target_branch_link'][len(api_base):]
source = 'lp:' + merge_data['source_branch_link'][len(api_base):]
bzr('branch --use-existing-dir {} {}'.format(target, dir_))
bzr('merge {}'.format(source), cwd=dir_)
bzr('commit --unchanged -m "Merge commit"', cwd=dir_)
return rename(dir_)
class GithubFetcher(Fetcher):
MATCH = re.compile(r"""
^(gh:|github:|https?://(www\.)?github.com/)
(?P<repo>[^@]*)(@(?P<revision>.*))?$
""", re.VERBOSE)
def fetch(self, dir_):
dir_ = tempfile.mkdtemp(dir=dir_)
url = 'https://github.com/' + self.repo
git('clone {} {}'.format(url, dir_))
if self.revision:
git('checkout {}'.format(self.revision), cwd=dir_)
return rename(dir_)
class BitbucketFetcher(Fetcher):
MATCH = re.compile(r"""
^(bb:|bitbucket:|https?://(www\.)?bitbucket.org/)
(?P<repo>[^@]*)(@(?P<revision>.*))?$
""", re.VERBOSE)
def fetch(self, dir_):
dir_ = tempfile.mkdtemp(dir=dir_)
url = 'https://bitbucket.org/' + self.repo
if url.endswith('.git'):
return self._fetch_git(url, dir_)
return self._fetch_hg(url, dir_)
def _fetch_git(self, url, dir_):
git('clone {} {}'.format(url, dir_))
if self.revision:
git('checkout {}'.format(self.revision), cwd=dir_)
return rename(dir_)
def _fetch_hg(self, url, dir_):
cmd = 'clone {} {}'.format(url, dir_)
if self.revision:
cmd = '{} -u {}'.format(cmd, self.revision)
hg(cmd)
return rename(dir_)
class LocalFetcher(Fetcher):
@classmethod
def can_fetch(cls, url):
src = os.path.abspath(
os.path.join(os.getcwd(), os.path.expanduser(url)))
if os.path.exists(src):
return dict(path=src)
return {}
def fetch(self, dir_):
dst = os.path.join(dir_, os.path.basename(self.path.rstrip(os.sep)))
shutil.copytree(self.path, dst, symlinks=True)
return dst
class StoreCharm(object):
STORE_URL = 'https://store.juju.ubuntu.com/charm-info'
def __init__(self, name):
self.name = name
self.data = self.fetch()
def __getattr__(self, key):
return self.data[key]
def fetch(self):
params = {
'stats': 0,
'charms': self.name,
}
r = get(self.STORE_URL, params=params).json()
charm_data = r[self.name]
if 'errors' in charm_data:
raise FetchError(
'Error retrieving "{}" from charm store: {}'.format(
self.name, '; '.join(charm_data['errors']))
)
return charm_data
class CharmstoreDownloader(Fetcher):
MATCH = re.compile(r"""
^cs:(?P<charm>.*)$
""", re.VERBOSE)
STORE_URL = 'https://store.juju.ubuntu.com/charm/'
def __init__(self, *args, **kw):
super(CharmstoreDownloader, self).__init__(*args, **kw)
self.charm = StoreCharm(self.charm)
def fetch(self, dir_):
url = self.charm.data['canonical-url'][len('cs:'):]
url = self.STORE_URL + url
archive = self.download_file(url, dir_)
charm_dir = self.extract_archive(archive, dir_)
return rename(charm_dir)
def extract_archive(self, archive, dir_):
tempdir = tempfile.mkdtemp(dir=dir_)
log.debug("Extracting %s to %s", archive, tempdir)
# Can't extract with python due to bug that drops file
# permissions: http://bugs.python.org/issue15795
# In particular, it's important that executable test files in the
# archive remain executable, otherwise the tests won't be run.
# Instead we use a shell equivalent of the following:
# archive = zipfile.ZipFile(archive, 'r')
# archive.extractall(tempdir)
check_call('unzip {} -d {}'.format(archive, tempdir))
return tempdir
def download_file(self, url, dir_):
_, filename = tempfile.mkstemp(dir=dir_)
log.debug("Downloading %s", url)
r = get(url, stream=True)
with open(filename, 'wb') as f:
for chunk in r.iter_content(chunk_size=1024):
if chunk: # filter out keep-alive new chunks
f.write(chunk)
f.flush()
return filename
def get_revision(self, dir_):
return self.charm.revision
class BundleDownloader(Fetcher):
MATCH = re.compile(r"""
^bundle:(?P<bundle>.*)$
""", re.VERBOSE)
def fetch(self, dir_):
url = Bundle(self.bundle).deployer_file_url
bundle_dir = self.download_file(url, dir_)
return bundle_dir
def download_file(self, url, dir_):
bundle_dir = tempfile.mkdtemp(dir=dir_)
bundle_file = os.path.join(bundle_dir, 'bundles.yaml')
log.debug("Downloading %s to %s", url, bundle_file)
r = get(url, stream=True)
with open(bundle_file, 'w') as f:
for chunk in r.iter_content(chunk_size=1024):
if chunk: # filter out keep-alive new chunks
f.write(chunk)
f.flush()
return bundle_dir
def get_revision(self, dir_):
return Bundle(self.bundle).basket_revision
def bzr(cmd, **kw):
check_call('bzr ' + cmd, **kw)
def git(cmd, **kw):
check_call('git ' + cmd, **kw)
def hg(cmd, **kw):
check_call('hg ' + cmd, **kw)
def check_call(cmd, **kw):
return check_output(cmd, **kw)
class FetchError(Exception):
pass
def check_output(cmd, **kw):
args = shlex.split(cmd)
p = subprocess.Popen(
args,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
**kw
)
out, _ = p.communicate()
if p.returncode != 0:
raise FetchError(out)
log.debug('%s: %s', cmd, out)
return out
FETCHERS = [
BzrFetcher,
BzrMergeProposalFetcher,
GithubFetcher,
BitbucketFetcher,
LocalFetcher,
CharmstoreDownloader,
BundleDownloader,
]
def get_fetcher(url):
for fetcher in FETCHERS:
matchdict = fetcher.can_fetch(url)
if matchdict:
return fetcher(url, **matchdict)
raise FetchError('No fetcher for url: %s' % url)
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