Source: python-eventlet
Version: 0.35.1-1
Severity: normal
X-Debbugs-Cc: d...@debian.org, wb-t...@buildd.debian.org
Control: affects -1 buildd.debian.org
Hi,
python-eventlet fails to build with no nameserver specified in
/etc/resolv.conf:
=================================== FAILURES ===================================
_________________________ TestProxyResolver.test_clear _________________________
self = <tests.greendns_test.TestProxyResolver testMethod=test_clear>
def test_clear(self):
rp = greendns.ResolverProxy()
assert rp._cached_resolver is None
> resolver = rp._resolver
tests/greendns_test.py:304:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
eventlet/support/greendns.py:347: in _resolver
self.clear()
eventlet/support/greendns.py:355: in clear
self._resolver = dns.resolver.Resolver(filename=self._filename)
/usr/lib/python3/dist-packages/dns/resolver.py:944: in __init__
self.read_resolv_conf(filename)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <dns.resolver.Resolver object at 0x7f9116b8ac90>
f = <_io.TextIOWrapper name='/etc/resolv.conf' mode='r' encoding='UTF-8'>
def read_resolv_conf(self, f: Any) -> None:
"""Process *f* as a file in the /etc/resolv.conf format. If f is
a ``str``, it is used as the name of the file to open; otherwise it
is treated as the file itself.
Interprets the following items:
- nameserver - name server IP address
- domain - local domain name
- search - search list for host-name lookup
- options - supported options are rotate, timeout, edns0, and ndots
"""
nameservers = []
if isinstance(f, str):
try:
cm: contextlib.AbstractContextManager = open(f)
except OSError:
# /etc/resolv.conf doesn't exist, can't be read, etc.
raise NoResolverConfiguration(f"cannot open {f}")
else:
cm = contextlib.nullcontext(f)
with cm as f:
for l in f:
if len(l) == 0 or l[0] == "#" or l[0] == ";":
continue
tokens = l.split()
# Any line containing less than 2 tokens is malformed
if len(tokens) < 2:
continue
if tokens[0] == "nameserver":
nameservers.append(tokens[1])
elif tokens[0] == "domain":
self.domain = dns.name.from_text(tokens[1])
# domain and search are exclusive
self.search = []
elif tokens[0] == "search":
# the last search wins
self.search = []
for suffix in tokens[1:]:
self.search.append(dns.name.from_text(suffix))
# We don't set domain as it is not used if
# len(self.search) > 0
elif tokens[0] == "options":
for opt in tokens[1:]:
if opt == "rotate":
self.rotate = True
elif opt == "edns0":
self.use_edns()
elif "timeout" in opt:
try:
self.timeout = int(opt.split(":")[1])
except (ValueError, IndexError):
pass
elif "ndots" in opt:
try:
self.ndots = int(opt.split(":")[1])
except (ValueError, IndexError):
pass
if len(nameservers) == 0:
> raise NoResolverConfiguration("no nameservers")
E dns.resolver.NoResolverConfiguration: no nameservers
/usr/lib/python3/dist-packages/dns/resolver.py:1038: NoResolverConfiguration
This fails in sbuild with the unshare backend.
Cheers Jochen
