def determine_mirror(mirror, version, releases_development):
# if you have a saviour mirror, let's assume it's a good one
for source, _ in http_cache.saviour_sources():
if source != 'direct' and http_cache.is_fetcheable(source, mirror):
return mirror
# we can query a georedirector for a local Fedora mirror and use just
# that one, consistently. problem is, it also yields really broken ones.
# let's check that a mirror has at least a repomd.xml and a kernel:
updates_repomd = f'updates/{version}/Everything/x86_64/repodata/repomd.xml'
kernel = (f'{releases_development}/{version}'
'/Everything/x86_64/os/isolinux/vmlinuz')
h = requests.head(mirror + '/' + updates_repomd, allow_redirects=False)
if h.status_code in (301, 302, 303, 307, 308) and 'Location' in h.headers:
r = h.headers['Location'].rstrip('/').replace('https://', 'http://')
assert r.endswith('/' + updates_repomd)
base = r[:-len('/' + updates_repomd)]
# good, now now ensure it also has a kernel
h = requests.head(base + '/' + kernel)
if h.status_code != 200:
log.warning(f'{base + "/" + kernel} -> {h.status_code}')
log.warning(f'mirror {base} is broken, trying another one')
return determine_mirror(mirror, version, releases_development)
else:
return base
return mirror
def machines(expired_for=0):
if expired_for != 'all':
adjusted_time = time.time() - units.parse_time_interval(expired_for)
for root, dirs, files in os.walk(path.MACHINES, topdown=False):
for d in (os.path.join(root, x) for x in dirs):
lock_path = os.path.join(root, '.' + os.path.basename(d) + '-lock')
lock = fasteners.process_lock.InterProcessLock(lock_path)
lock.acquire()
try:
remove = fingertip.machine.needs_a_rebuild(d, by=adjusted_time)
except Exception as ex:
log.warning(f'while processing {d}: {ex}')
remove = True
if (expired_for == 'all' or remove):
assert os.path.realpath(d).startswith(
os.path.realpath(path.MACHINES))
log.info(f'removing {os.path.realpath(d)}')
if not os.path.islink(d):
shutil.rmtree(d)
else:
os.unlink(d)
else:
log.debug(f'keeping {os.path.realpath(d)}')
os.unlink(lock_path)
lock.release()
def schedule():
# Do this only if fingertip is in PATH
if not shutil.which("fingertip"):
log.debug('No `fingertip` found in PATH. Not scheduling '
'automatic cleanup.')
return
# Skip if systemd is not available
if not shutil.which('systemd-run') or not shutil.which('systemctl'):
log.warning('It looks like systemd is not available. '
'No cleanup is scheduled! If you are running out of disk, '
'space, run `fingertip cleanup periodic` manually.')
return
# If the timer is already installed skip installation too
p = subprocess.run([
'systemctl', '--user', 'is-active', '--quiet',
'fingertip-cleanup.timer'
])
if p.returncode == 0:
log.debug('The systemd timer handling cleanup is already installed '
'and running.')
return
# Run twice a day
log.info('Scheduling cleanup to run every two hours')
subprocess.run([
'systemd-run', '--unit=fingertip-cleanup', '--user',
'--on-calendar=0/2:00:00', 'fingertip', 'cleanup', 'periodic'
])
def storage_destroy():
mount = subprocess.run(['mount'], capture_output=True)
if path.COW_IMAGE in mount.stdout.decode():
log.warning('Filesystem is still mounted. Trying to unmount.')
storage_unmount()
if os.path.exists(path.COW_IMAGE):
os.unlink(path.COW_IMAGE)
def has_space(how_much='2G', reserve_fraction=.5, where=None):
where = where or tempfile.gettempdir()
how_much = units.parse_binary(how_much)
total, _, free = shutil.disk_usage(where)
if not free >= how_much:
log.warning(f'{where} does not have {how_much} of free space')
if not free >= total * reserve_fraction:
log.warning(f'{where} is {int((1 - reserve_fraction) * 100)}% full')
return free >= how_much and free >= total * reserve_fraction
def file_has_not_changed(self, path):
log.debug(f'checking that {path} has not changed...')
mtime, hash_ = self._deps[path]
if mtime != (os.stat(path).st_mtime):
if hash_ != weak_hash.of_file(path):
log.warning(f'{path} has changed, set '
'FINGERTIP_IGNORE_CODE_CHANGES=1 to ignore')
return False
return True
def storage_destroy():
backing_file = os.path.join(path.CACHE, 'for-machines.xfs')
if os.path.exists(backing_file):
# we should not remove the file if it is mounted
mount = subprocess.run(['mount'], capture_output=True)
if backing_file in mount.stdout.decode():
log.warning('Filesystem is still mounted. Trying to unmount.')
storage_unmount()
os.unlink(backing_file)
def hack_around_unpacking(uri, headers, wrong_content):
log.warning(f're-fetching correct content for {uri}')
r = requests.get(uri, headers=headers, stream=True, allow_redirects=False)
h = hashlib.sha256(wrong_content).hexdigest()
cachefile = path.downloads('fixups', h, makedirs=True)
if not os.path.exists(cachefile):
with path.wip(cachefile) as wip:
with open(wip, 'wb') as f:
shutil.copyfileobj(r.raw, f)
with open(cachefile, 'rb') as f:
return f.read()
def has_space(how_much='2G', reserve_fraction=.3, where='/tmp'):
for suffix, power in {'G': 30, 'M': 20, 'K': 10}.items():
if isinstance(how_much, str) and how_much.endswith(suffix):
how_much = float(how_much[:-1]) * 2**power
break
total, _, free = shutil.disk_usage(where)
if not free >= how_much:
log.warning(f'{where} does not have {how_much} of free space')
if not free >= total * reserve_fraction:
log.warning(f'{where} is {int((1 - reserve_fraction) * 100)}% full')
return free >= how_much and free >= total * reserve_fraction
def files_have_not_changed(self):
if os.getenv('FINGERTIP_IGNORE_CODE_CHANGES', '0') != '0':
return True
for path, (mtime, hash_) in self._deps.items():
log.debug(f'checking that {path} has not changed...')
if mtime != (os.stat(path).st_mtime):
if hash_ != weak_hash.of_file(path):
log.warning(f'{path} has changed, set '
'FINGERTIP_IGNORE_CODE_CHANGES=1 to ignore')
return False
return True
def remove(*paths):
for path in paths:
assert AUTOREMOVE_PREFIX in path
try:
if not os.path.isdir(path) or os.path.islink(path):
try:
os.unlink(path)
except FileNotFoundError:
pass
else:
shutil.rmtree(path, ignore_errors=True)
except Exception as e:
log.warning(f'cleanup error for {path}: {e}')
def dir_listing_has_not_changed(self, path):
log.debug(f'checking that {path} listing has not changed...')
mtime, hash_ = self._deps_dirs[path]
try:
if mtime != (os.stat(path).st_mtime):
listing = repr(sorted(os.listdir(path)))
if hash_ != weak_hash.of_string(listing):
log.warning(f'{path} listing has changed, set '
'FINGERTIP_IGNORE_FILE_CHANGES=1 to ignore')
return False
except FileNotFoundError:
return False
return True
def c_r_offline(self, request):
cache_url = self.cache_url(request.url)
log.debug(f'looking up {cache_url} in the cache')
cache_data = self.cache.get(cache_url)
if cache_data is None:
log.error(f'{cache_url} not in cache and fingertip is offline')
return False
resp = self.serializer.loads(request, cache_data)
if not resp:
log.error(f'{cache_url} cache entry deserialization failed, ignored')
return False
log.warning(f'Using {cache_url} from offline cache')
return resp
def is_fetcheable(source, url, timeout=2):
if source == 'local':
return os.path.exists(path.saviour(url))
elif source != 'direct':
url = source + '/' + url
url = 'http://' + url if '://' not in source else url
try:
r = requests.head(url, allow_redirects=False, timeout=timeout)
return r.status_code < 400
except (requests.exceptions.BaseHTTPError, urllib3.exceptions.HTTPError,
requests.exceptions.Timeout, OSError) as ex:
log.warning(f'{ex}')
return False
return False
def needs_a_rebuild(mpath, by=None):
with open(os.path.join(mpath, 'machine.clpickle'), 'rb') as f:
m = cloudpickle.load(f)
if not m.expiration.files_have_not_changed():
return True
expired = m.expiration.is_expired(by)
if expired:
log.debug(f'{mpath} has expired at {m.expiration.pretty()}')
else:
log.debug(f'{mpath} is valid until {m.expiration.pretty()}')
if OFFLINE and expired:
log.warning(f'{mpath} expired at {m.expiration.pretty()}, '
'but offline mode is enabled, so, reusing it')
return expired and not OFFLINE
def _serve(self, uri, headers, meth='GET'):
uri = uri.lstrip('/')
if uri in http_cache._mocks:
return self._serve_http(uri, headers, meth, cache=False)
sources = saviour_sources()
for i, (source, cache) in enumerate(sources):
if is_fetcheable(source, uri) or i == len(sources) - 1:
if source == 'local':
if meth == 'GET':
return super().do_GET()
elif meth == 'HEAD':
return super().do_HEAD()
elif source == 'direct':
if WARN_ON_DIRECT:
log.warning(f'{uri} not found on any mirror')
su = uri
else:
su = source + '/' + uri
su = 'http://' + su if '://' not in source else su
return self._serve_http(su, headers, meth, cache=cache)
def fetch(self, url, out_path):
sources = saviour_sources()
for i, (source, cache) in enumerate(sources):
if is_fetcheable(source, url) or i == len(sources) - 1:
if source == 'local':
reflink.auto(path.saviour(url), out_path)
return
sess = self._get_requests_session(direct=not cache)
if source == 'direct':
if WARN_ON_DIRECT:
log.warning(f'{url} not found on any mirror')
surl = url
else:
surl = source + '/' + url
surl = 'http://' + surl if '://' not in source else surl
log.debug(f'fetching{"/caching" if cache else ""} '
f'{os.path.basename(url)} from {surl}')
r = sess.get(surl) # not raw because that punctures cache
with open(out_path, 'wb') as f:
f.write(r.content)
return
def _serve(self, uri, headers, meth='GET'):
sess = http_cache._get_requests_session()
headers = {k: v for k, v in headers.items() if
not (k in STRIP_HEADERS or k.startswith('Proxy-'))}
log.debug(f'{meth} {uri}')
for k, v in headers.items():
log.debug(f'{k}: {v}')
try:
if meth == 'GET' and not OFFLINE:
# direct streaming might be required...
preview = sess.head(uri, headers=headers,
allow_redirects=False)
direct = None
if int(preview.headers.get('Content-Length', 0)) > BIG:
direct = f'file bigger than {BIG}'
if 'Range' in headers:
# There seems to be a bug in CacheControl
# that serves contents in full if a range request
# hits a non-ranged cached entry.
direct = f'ranged request, playing safe'
if direct:
# Don't cache, don't reencode, stream it as is
log.warning(f'streaming {uri} directly ({direct})')
r = requests.get(uri, headers=headers, stream=True)
self._status_and_headers(r.status_code, r.headers)
self.copyfile(r.raw, self.wfile)
return
# fetch with caching
m_func = getattr(sess, meth.lower())
r = m_func(uri if '://' in uri else 'http://self' + uri,
headers=headers, allow_redirects=False)
data = r.content
length = int(r.headers.get('Content-Length', 0))
if len(data) != length:
data = hack_around_unpacking(uri, headers, data)
assert len(data) == length
self._status_and_headers(r.status_code, r.headers)
if meth == 'GET':
self.wfile.write(data)
log.info(f'{meth} {uri} served {length}')
except BrokenPipeError:
log.warning(f'Broken pipe for {meth} {uri}')
except ConnectionResetError:
log.warning(f'Connection reset for {meth} {uri}')
except requests.exceptions.ConnectionError:
log.warning(f'Connection error for {meth} {uri}')
def storage_setup_wizard():
assert SETUP in ('auto', 'suggest', 'never')
if SETUP == 'never':
return
size = SIZE
os.makedirs(path.MACHINES, exist_ok=True)
if not is_supported(path.MACHINES):
log.warning(f'images directory {path.MACHINES} lacks reflink support')
log.warning('without it, fingertip will thrash and fill up your SSD '
'in no time')
backing_file = os.path.join(path.CACHE, 'for-machines.xfs')
if not os.path.exists(backing_file):
if SETUP == 'suggest':
log.info(f'would you like to allow fingertip '
f'to allocate {size} at {backing_file} '
'for a reflink-enabled XFS loop mount?')
log.info('(set FINGERTIP_SETUP="auto" environment variable'
' to do it automatically)')
i = input(f'[{size}]/different size/cancel/ignore> ').strip()
if i == 'cancel':
log.error('cancelled')
sys.exit(1)
elif i == 'ignore':
return
size = i or size
tmp = temp.disappearing_file(path.CACHE)
create_supported_fs(tmp, size)
os.rename(tmp, backing_file)
log.info(f'fingertip will now mount the XFS image at {backing_file}')
if SETUP == 'suggest':
i = input(f'[ok]/skip/cancel> ').strip()
if i == 'skip':
log.warning('skipping; '
'fingertip will have no reflink superpowers')
log.warning('tell your SSD I\'m sorry')
return
elif i and i != 'ok':
log.error('cancelled')
sys.exit(1)
mount_supported_fs(backing_file, path.MACHINES)
def __init__(self, url, *path_components, enough_to_have=None):
assert path_components
self.url = url
cache_path = path.downloads('git', *path_components, makedirs=True)
cache_exists = os.path.exists(cache_path)
self.path = temp.disappearing_dir(os.path.dirname(cache_path),
path_components[-1])
lock_working_copy_path = self.path + '-lock'
lock_cache_path = cache_path + '-lock'
lock.Lock.__init__(self, lock_working_copy_path)
update_not_needed = None
sources = saviour_sources()
self.self_destruct = False
with lock.Lock(lock_cache_path), lock.Lock(lock_working_copy_path):
_remove(self.path)
for i, (source, cache) in enumerate(sources):
last_source = i == len(sources) - 1
if cache and cache_exists and update_not_needed is None:
cr = git.Repo(cache_path)
update_not_needed = enough_to_have and (
enough_to_have in (t.name for t in cr.tags) or
enough_to_have in (h.name for h in cr.heads) or
enough_to_have in (c.hexsha for c in cr.iter_commits())
# that's not all revspecs, but best-effort is fine
)
if update_not_needed:
log.info(f'not re-fetching {url} from {source} '
f'because {enough_to_have} '
'is already present in cache')
git.Repo.clone_from(cache_path, self.path, mirror=True)
break
if source == 'local':
surl = path.saviour(url).replace('//', '/') # workaround
if not os.path.exists(surl) and not last_source:
continue
log.info(f'cloning {url} from local saviour mirror')
git.Repo.clone_from(surl, self.path, mirror=True)
break
elif source == 'direct':
surl = url
else:
surl = source + '/' + url
surl = 'http://' + surl if '://' not in source else surl
log.info(f'cloning {url} from {source} '
f'cache_exists={cache_exists}...')
try:
# TODO: bare clone
# no harm in referencing cache, even w/o cached+
git.Repo.clone_from(surl, self.path, mirror=True,
dissociate=True,
reference_if_able=cache_path)
except git.GitError:
log.warning(f'could not clone {url} from {source}')
if last_source:
raise
continue
break
_remove(cache_path)
reflink.auto(self.path, cache_path)
git.Repo.__init__(self, self.path)
self.remotes[0].set_url(url)
self.self_destruct = True
def mirror(config, *what_to_mirror):
total_failures = []
failures = collections.defaultdict(list)
with open(config) as f:
config = ruamel.yaml.YAML(typ='safe').load(f)
hows, whats = config['how'], config['what']
if not what_to_mirror:
what_to_mirror = whats.keys()
else:
what_to_mirror = [k for k in whats.keys()
if any((fnmatch.fnmatch(k, req)
for req in what_to_mirror))]
for resource_name in what_to_mirror or whats.keys():
s = whats[resource_name]
log.debug(f'processing {resource_name}...')
if s is None:
how, suffix = resource_name, ''
elif '/' in s:
how, suffix = s.split('/', 1)
suffix = '/' + suffix
else:
how, suffix = s, ''
try:
how = hows[how]
except KeyError:
log.error(f'missing how section on {how}')
raise SystemExit()
url = how['url'] + suffix
method = how['method']
sources = (how['sources'] if 'sources' in how else [how['url']])
sources = [s + suffix for s in sources]
extra_args = {k: v for k, v in how.items()
if k not in ('url', 'sources', 'method')}
if f'method_{method}' not in globals():
log.error(f'unsupported method {method}')
raise SystemExit()
meth = globals()[f'method_{method}']
symlink = path.saviour(url.rstrip('/'))
# usually symlink points to data, but while we're working on it,
# it temporarily points to a consistent snapshot of it named `snap`
data = path.saviour('_', resource_name, 'data')
snap = path.saviour('_', resource_name, 'snap')
temp = path.saviour('_', resource_name, 'temp')
lockfile = path.saviour('_', resource_name) + '-lock'
assert data.startswith(path.SAVIOUR)
assert snap.startswith(path.SAVIOUR)
assert temp.startswith(path.SAVIOUR)
sublog = log.Sublogger(f'{method} {resource_name}')
sublog.info('locking...')
with lock.Lock(lockfile):
os.makedirs(os.path.dirname(snap), exist_ok=True)
if os.path.exists(temp):
sublog.info('removing stale temp...')
_remove(temp)
if os.path.exists(symlink): # it's already published
if os.path.exists(data) and not os.path.exists(snap):
# `data` is present and is the best we have to publish
sublog.info('snapshotting...')
reflink.always(data, temp, preserve=True)
os.rename(temp, snap)
if os.path.exists(snap):
# link to a consistent snapshot while we work on `data`
_symlink(snap, symlink)
for source in sources:
sublog.info(f'trying {source}...')
try:
meth(sublog, source, snap, data, **extra_args)
assert os.path.exists(data)
break
except Exception as _:
traceback.print_exc()
failures[resource_name].append(source)
fingertip.util.log.warning(f'failed to mirror {source}')
if len(failures[resource_name]) == len(sources):
sublog.error(f'failed to mirror '
f'from all {len(sources)} sources')
total_failures.append(resource_name)
continue
_symlink(data, symlink)
if os.path.exists(snap):
os.rename(snap, temp) # move it out the way asap
sublog.info('removing now obsolete snapshot...')
_remove(temp)
try:
deduplicate(sublog, resource_name, timeout=1)
except lock.LockTimeout:
log.warning('skipped deduplication, db was locked')
if total_failures:
fingertip.util.log.error(f'failed: {", ".join(total_failures)}')
raise SystemExit()
log.info('saviour has completed mirroring')
def mirror(config, *what_to_mirror, deduplicate=None):
total_failures = []
failures = collections.defaultdict(list)
with open(config) as f:
config = ruamel.yaml.YAML(typ='safe').load(f)
if 'mirror' in config and not config['mirror']:
log.warning('mirroring is disabled in config')
return
hows, whats = config['how'], config['what']
if not what_to_mirror:
what_to_mirror = whats.keys()
else:
what_to_mirror = ([
k for k in whats.keys() if any(
fnmatch.fnmatch(k, req) for req in what_to_mirror)
] + [k for k in what_to_mirror if '=' in k])
if not what_to_mirror:
log.error('nothing to mirror')
return
for resource in what_to_mirror:
log.debug(f'processing {resource}...')
if '=' not in resource: # example: alpine-3.13=alpine/v3.13/main/x86
resource_name, tail = resource, ''
s = whats[resource_name]
else: # example: alpine-3.13=alpine/v3.13/main/x86
resource_name, s = resource.split('=', 1)
# FIXME UGLY: config overrides are stronger that = (more syntax?)
# TODO: whats shouldn't be a dict, I think, just a list of strings
if resource_name in whats:
s = whats[resource_name]
if s is None:
s = resource_name
if '/' in s:
how_name, suffix = s.split('/', 1)
suffix = '/' + suffix
else:
how_name, suffix = s, ''
try:
how = hows[how_name]
except KeyError:
log.error(f'missing how section on {how_name}')
raise SystemExit()
url = how['url'] + suffix
method = how['method']
sources = (how['sources'] if 'sources' in how else [how['url']])
sources = [s + suffix for s in sources]
extra_args = {
k: v
for k, v in how.items()
if k not in ('url', 'sources', 'method', 'validate', 'deduplicate')
}
if f'method_{method}' not in globals():
log.error(f'unsupported method {method}')
raise SystemExit()
meth = globals()[f'method_{method}']
symlink = path.saviour(url.rstrip('/'))
# usually symlink points to data, but while we're working on it,
# it temporarily points to a consistent snapshot of it named `snap`
data = os.path.realpath(path.saviour('_', resource_name, 'data'))
snap = os.path.realpath(path.saviour('_', resource_name, 'snap'))
temp = os.path.realpath(path.saviour('_', resource_name, 'temp'))
lockfile = path.saviour('_', resource_name) + '-lock'
assert data.startswith(os.path.realpath(path.SAVIOUR))
assert snap.startswith(os.path.realpath(path.SAVIOUR))
assert temp.startswith(os.path.realpath(path.SAVIOUR))
sublog = log.Sublogger(f'{method} {resource_name}')
sublog.info('locking...')
with lock.Lock(lockfile):
os.makedirs(os.path.dirname(snap), exist_ok=True)
if os.path.exists(temp):
sublog.info('removing stale temp...')
_remove(temp)
if os.path.exists(symlink): # it's already published
if os.path.exists(data) and not os.path.exists(snap):
# `data` is present and is the best we have to publish
sublog.info('snapshotting...')
reflink.always(data, temp, preserve=True)
os.rename(temp, snap)
if os.path.exists(snap):
# link to a consistent snapshot while we work on `data`
_symlink(snap, symlink)
for source in sources:
sublog.info(f'trying {source}...')
try:
meth(sublog, source, snap, data, **extra_args)
assert os.path.exists(data)
if 'validate' in how:
sublog.info(f'validating with {how["validate"]}...')
validator = globals()[f'validate_{how["validate"]}']
validator(sublog, source, data)
sublog.info('validated')
break
except Exception as _:
traceback.print_exc()
failures[resource_name].append(source)
fingertip.util.log.warning(f'failed to mirror {source}')
if len(failures[resource_name]) == len(sources):
sublog.error(f'failed to mirror '
f'from all {len(sources)} sources')
total_failures.append(resource_name)
continue
_symlink(data, symlink)
if os.path.exists(snap):
os.rename(snap, temp) # move it out the way asap
sublog.info('removing now obsolete snapshot...')
_remove(temp)
how_deduplicate = how.get('deduplicate', True)
db_name = how_deduplicate if how_deduplicate is not True else how_name
if how_deduplicate and deduplicate is not False:
try:
_deduplicate(sublog, db_name, resource_name, timeout=1)
except lock.LockTimeout:
log.warning(f'skipped deduplication of {resource_name}, '
f'db {db_name} was locked')
if total_failures:
fingertip.util.log.error(f'failed: {", ".join(total_failures)}')
raise FailureToMirrorError(", ".join(total_failures))
log.info('saviour has completed mirroring')
def _serve_http(self,
uri,
headers,
meth='GET',
cache=True,
retries=RETRIES_MAX):
sess = http_cache._get_requests_session(direct=not cache)
sess_dir = http_cache._get_requests_session(direct=True)
basename = os.path.basename(uri)
headers = {
k: v
for k, v in headers.items()
if not (k in STRIP_HEADERS or k.startswith('Proxy-'))
}
headers['Accept-Encoding'] = 'identity'
log.debug(f'{meth} {basename} ({uri})')
for k, v in headers.items():
log.debug(f'{k}: {v}')
error = None
try:
if meth == 'GET':
# direct streaming or trickery might be required...
preview = sess.head(uri,
headers=headers,
allow_redirects=False)
if (300 <= preview.status_code < 400
and 'Location' in preview.headers):
nu = preview.headers['Location']
if nu.startswith('https://'):
# no point in serving that, we have to pretend
# that never happened
log.debug(f'suppressing HTTPS redirect {nu}')
return self._serve_http(nu,
headers,
meth=meth,
cache=cache,
retries=retries)
direct = []
if not cache:
direct.append('caching disabled for this source')
if int(preview.headers.get('Content-Length', 0)) > BIG:
direct.append(f'file bigger than {BIG}')
if 'Range' in headers:
# There seems to be a bug in CacheControl
# that serves contents in full if a range request
# hits a non-ranged cached entry.
direct.append('ranged request, playing safe')
if direct:
# Don't cache, don't reencode, stream it as is
log.debug(f'streaming {basename} directly '
f'from {uri} ({", ".join(direct)})')
r = sess_dir.get(uri, headers=headers, stream=True)
self._status_and_headers(r.status_code, r.headers)
shutil.copyfileobj(r.raw, self.wfile)
return
# fetch with caching
m_func = getattr(sess, meth.lower())
r = m_func(uri if '://' in uri else 'http://self' + uri,
headers=headers,
allow_redirects=False)
data = r.content
if 'Content-Length' in r.headers:
length = int(r.headers['Content-Length'])
if len(data) != length:
data = hack_around_unpacking(uri, headers, data)
assert len(data) == length
except BrokenPipeError:
error = f'Upwards broken pipe for {meth} {uri}'
except ConnectionResetError:
error = f'Upwards connection reset for {meth} {uri}'
except requests.exceptions.ConnectionError:
error = f'Upwards connection error for {meth} {uri}'
if error:
# delay a re-request
if retries:
log.warning(f'{error} (will retry x{retries})')
t = (RETRIES_MAX - retries) / RETRIES_MAX * COOLDOWN
time.sleep(t)
return self._serve_http(uri,
headers,
meth=meth,
cache=cache,
retries=retries - 1)
else:
log.error(f'{error} (out of retries)')
self.send_error(http.HTTPStatus.SERVICE_UNAVAILABLE)
return
log.debug(f'{meth} {basename} fetched {r.status_code} ({uri})')
try:
self._status_and_headers(r.status_code, r.headers)
if meth == 'GET':
self.wfile.write(data)
except BrokenPipeError:
log.warning(f'Downwards broken pipe for {meth} {uri}')
except ConnectionResetError:
log.warning(f'Downwards connection reset for {meth} {uri}')
except requests.exceptions.ConnectionError:
log.warning(f'Downwards connection error for {meth} {uri}')
log.debug(f'{meth} {basename} served ({uri})')
def __init__(self, url, *path_components, enough_to_have=None):
if not path_components:
path_components = [url.replace('/', '::')]
self.url = url
cache_path = path.downloads('git', *path_components, makedirs=True)
self.path = temp.disappearing_dir(os.path.dirname(cache_path),
path_components[-1])
lock_working_copy_path = self.path + '-lock'
lock_cache_path = cache_path + '-lock'
lock.Lock.__init__(self, lock_working_copy_path)
sources = saviour_sources()
self.self_destruct = False
with lock.Lock(lock_cache_path), lock.Lock(lock_working_copy_path):
cache_is_enough = False
if os.path.exists(cache_path):
try:
cr = git.Repo(cache_path)
cache_is_enough = (enough_to_have
and _has_rev(cr, enough_to_have))
except git.GitError as e:
log.error(f'something wrong with git cache {cache_path}')
log.error(str(e))
_remove(self.path)
for i, (source, cache) in enumerate(sources):
last_source = i == len(sources) - 1
if cache and cache_is_enough:
log.info(f'not re-fetching {url} from {source} '
f'because {enough_to_have} '
'is already present in cache')
git.Repo.clone_from(cache_path, self.path, mirror=True)
break
if source == 'local':
surl = path.saviour(url).replace('//', '/') # workaround
if not os.path.exists(surl) and not last_source:
continue
log.info(f'cloning {url} from local saviour mirror')
git.Repo.clone_from(surl, self.path, mirror=True)
break
elif source == 'direct':
surl = url
else:
surl = source + '/' + url
surl = 'http://' + surl if '://' not in source else surl
log.info(f'cloning {url} from {source} '
f'cache_exists={os.path.exists(cache_path)}...')
try:
# TODO: bare clone
# no harm in referencing cache, even w/o cached+
git.Repo.clone_from(surl,
self.path,
mirror=True,
dissociate=True,
reference_if_able=cache_path)
except git.GitError:
log.warning(f'could not clone {url} from {source}')
if last_source:
raise
continue
break
_remove(cache_path)
reflink.auto(self.path, cache_path)
git.Repo.__init__(self, self.path)
self.remotes[0].set_url(url)
self.self_destruct = True
