# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Ben Howard <ben.howard@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import abc
import os
import re
import stat
import string
import urllib.parse
from io import StringIO
from cloudinit import importer
from cloudinit import log as logging
from cloudinit import net
from cloudinit.net import eni
from cloudinit.net import network_state
from cloudinit.net import renderers
from cloudinit import ssh_util
from cloudinit import type_utils
from cloudinit import subp
from cloudinit import util
from cloudinit.features import \
ALLOW_EC2_MIRRORS_ON_NON_AWS_INSTANCE_TYPES
from cloudinit.distros.parsers import hosts
from .networking import LinuxNetworking
# Used when a cloud-config module can be run on all cloud-init distibutions.
# The value 'all' is surfaced in module documentation for distro support.
ALL_DISTROS = 'all'
OSFAMILIES = {
'alpine': ['alpine'],
'arch': ['arch'],
'debian': ['debian', 'ubuntu'],
'freebsd': ['freebsd'],
'gentoo': ['gentoo'],
'redhat': ['amazon', 'centos', 'fedora', 'rhel'],
'suse': ['opensuse', 'sles'],
}
LOG = logging.getLogger(__name__)
# This is a best guess regex, based on current EC2 AZs on 2017-12-11.
# It could break when Amazon adds new regions and new AZs.
_EC2_AZ_RE = re.compile('^[a-z][a-z]-(?:[a-z]+-)+[0-9][a-z]$')
# Default NTP Client Configurations
PREFERRED_NTP_CLIENTS = ['chrony', 'systemd-timesyncd', 'ntp', 'ntpdate']
# Letters/Digits/Hyphen characters, for use in domain name validation
LDH_ASCII_CHARS = string.ascii_letters + string.digits + "-"
class Distro(metaclass=abc.ABCMeta):
usr_lib_exec = "/usr/lib"
hosts_fn = "/etc/hosts"
ci_sudoers_fn = "/etc/sudoers.d/90-cloud-init-users"
hostname_conf_fn = "/etc/hostname"
tz_zone_dir = "/usr/share/zoneinfo"
init_cmd = ['service'] # systemctl, service etc
renderer_configs = {}
_preferred_ntp_clients = None
networking_cls = LinuxNetworking
def __init__(self, name, cfg, paths):
self._paths = paths
self._cfg = cfg
self.name = name
self.networking = self.networking_cls()
@abc.abstractmethod
def install_packages(self, pkglist):
raise NotImplementedError()
def _write_network(self, settings):
raise RuntimeError(
"Legacy function '_write_network' was called in distro '%s'.\n"
"_write_network_config needs implementation.\n" % self.name)
def _write_network_config(self, settings):
raise NotImplementedError()
def _supported_write_network_config(self, network_config):
priority = util.get_cfg_by_path(
self._cfg, ('network', 'renderers'), None)
name, render_cls = renderers.select(priority=priority)
LOG.debug("Selected renderer '%s' from priority list: %s",
name, priority)
renderer = render_cls(config=self.renderer_configs.get(name))
renderer.render_network_config(network_config)
return []
def _find_tz_file(self, tz):
tz_file = os.path.join(self.tz_zone_dir, str(tz))
if not os.path.isfile(tz_file):
raise IOError(("Invalid timezone %s,"
" no file found at %s") % (tz, tz_file))
return tz_file
def get_option(self, opt_name, default=None):
return self._cfg.get(opt_name, default)
def set_hostname(self, hostname, fqdn=None):
writeable_hostname = self._select_hostname(hostname, fqdn)
self._write_hostname(writeable_hostname, self.hostname_conf_fn)
self._apply_hostname(writeable_hostname)
def uses_systemd(self):
"""Wrapper to report whether this distro uses systemd or sysvinit."""
return uses_systemd()
@abc.abstractmethod
def package_command(self, cmd, args=None, pkgs=None):
raise NotImplementedError()
@abc.abstractmethod
def update_package_sources(self):
raise NotImplementedError()
def get_primary_arch(self):
arch = os.uname()[4]
if arch in ("i386", "i486", "i586", "i686"):
return "i386"
return arch
def _get_arch_package_mirror_info(self, arch=None):
mirror_info = self.get_option("package_mirrors", [])
if not arch:
arch = self.get_primary_arch()
return _get_arch_package_mirror_info(mirror_info, arch)
def get_package_mirror_info(self, arch=None, data_source=None):
# This resolves the package_mirrors config option
# down to a single dict of {mirror_name: mirror_url}
arch_info = self._get_arch_package_mirror_info(arch)
return _get_package_mirror_info(data_source=data_source,
mirror_info=arch_info)
def apply_network(self, settings, bring_up=True):
# this applies network where 'settings' is interfaces(5) style
# it is obsolete compared to apply_network_config
# Write it out
# pylint: disable=assignment-from-no-return
# We have implementations in arch and gentoo still
dev_names = self._write_network(settings)
# pylint: enable=assignment-from-no-return
# Now try to bring them up
if bring_up:
return self._bring_up_interfaces(dev_names)
return False
def _apply_network_from_network_config(self, netconfig, bring_up=True):
distro = self.__class__
LOG.warning("apply_network_config is not currently implemented "
"for distribution '%s'. Attempting to use apply_network",
distro)
header = '\n'.join([
"# Converted from network_config for distro %s" % distro,
"# Implementation of _write_network_config is needed."
])
ns = network_state.parse_net_config_data(netconfig)
contents = eni.network_state_to_eni(
ns, header=header, render_hwaddress=True)
return self.apply_network(contents, bring_up=bring_up)
def generate_fallback_config(self):
return net.generate_fallback_config()
def apply_network_config(self, netconfig, bring_up=False):
# apply network config netconfig
# This method is preferred to apply_network which only takes
# a much less complete network config format (interfaces(5)).
try:
dev_names = self._write_network_config(netconfig)
except NotImplementedError:
# backwards compat until all distros have apply_network_config
return self._apply_network_from_network_config(
netconfig, bring_up=bring_up)
# Now try to bring them up
if bring_up:
return self._bring_up_interfaces(dev_names)
return False
def apply_network_config_names(self, netconfig):
net.apply_network_config_names(netconfig)
@abc.abstractmethod
def apply_locale(self, locale, out_fn=None):
raise NotImplementedError()
@abc.abstractmethod
def set_timezone(self, tz):
raise NotImplementedError()
def _get_localhost_ip(self):
return "127.0.0.1"
def get_locale(self):
raise NotImplementedError()
@abc.abstractmethod
def _read_hostname(self, filename, default=None):
raise NotImplementedError()
@abc.abstractmethod
def _write_hostname(self, hostname, filename):
raise NotImplementedError()
@abc.abstractmethod
def _read_system_hostname(self):
raise NotImplementedError()
def _apply_hostname(self, hostname):
# This really only sets the hostname
# temporarily (until reboot so it should
# not be depended on). Use the write
# hostname functions for 'permanent' adjustments.
LOG.debug("Non-persistently setting the system hostname to %s",
hostname)
try:
subp.subp(['hostname', hostname])
except subp.ProcessExecutionError:
util.logexc(LOG, "Failed to non-persistently adjust the system "
"hostname to %s", hostname)
def _select_hostname(self, hostname, fqdn):
# Prefer the short hostname over the long
# fully qualified domain name
if not hostname:
return fqdn
return hostname
@staticmethod
def expand_osfamily(family_list):
distros = []
for family in family_list:
if family not in OSFAMILIES:
raise ValueError("No distibutions found for osfamily %s"
% (family))
distros.extend(OSFAMILIES[family])
return distros
def update_hostname(self, hostname, fqdn, prev_hostname_fn):
applying_hostname = hostname
# Determine what the actual written hostname should be
hostname = self._select_hostname(hostname, fqdn)
# If the previous hostname file exists lets see if we
# can get a hostname from it
if prev_hostname_fn and os.path.exists(prev_hostname_fn):
prev_hostname = self._read_hostname(prev_hostname_fn)
else:
prev_hostname = None
# Lets get where we should write the system hostname
# and what the system hostname is
(sys_fn, sys_hostname) = self._read_system_hostname()
update_files = []
# If there is no previous hostname or it differs
# from what we want, lets update it or create the
# file in the first place
if not prev_hostname or prev_hostname != hostname:
update_files.append(prev_hostname_fn)
# If the system hostname is different than the previous
# one or the desired one lets update it as well
if ((not sys_hostname) or (sys_hostname == prev_hostname and
sys_hostname != hostname)):
update_files.append(sys_fn)
# If something else has changed the hostname after we set it
# initially, we should not overwrite those changes (we should
# only be setting the hostname once per instance)
if (sys_hostname and prev_hostname and
sys_hostname != prev_hostname):
LOG.info("%s differs from %s, assuming user maintained hostname.",
prev_hostname_fn, sys_fn)
return
# Remove duplicates (incase the previous config filename)
# is the same as the system config filename, don't bother
# doing it twice
update_files = set([f for f in update_files if f])
LOG.debug("Attempting to update hostname to %s in %s files",
hostname, len(update_files))
for fn in update_files:
try:
self._write_hostname(hostname, fn)
except IOError:
util.logexc(LOG, "Failed to write hostname %s to %s", hostname,
fn)
# If the system hostname file name was provided set the
# non-fqdn as the transient hostname.
if sys_fn in update_files:
self._apply_hostname(applying_hostname)
def update_etc_hosts(self, hostname, fqdn):
header = ''
if os.path.exists(self.hosts_fn):
eh = hosts.HostsConf(util.load_file(self.hosts_fn))
else:
eh = hosts.HostsConf('')
header = util.make_header(base="added")
local_ip = self._get_localhost_ip()
prev_info = eh.get_entry(local_ip)
need_change = False
if not prev_info:
eh.add_entry(local_ip, fqdn, hostname)
need_change = True
else:
need_change = True
for entry in prev_info:
entry_fqdn = None
entry_aliases = []
if len(entry) >= 1:
entry_fqdn = entry[0]
if len(entry) >= 2:
entry_aliases = entry[1:]
if entry_fqdn is not None and entry_fqdn == fqdn:
if hostname in entry_aliases:
# Exists already, leave it be
need_change = False
if need_change:
# Doesn't exist, add that entry in...
new_entries = list(prev_info)
new_entries.append([fqdn, hostname])
eh.del_entries(local_ip)
for entry in new_entries:
if len(entry) == 1:
eh.add_entry(local_ip, entry[0])
elif len(entry) >= 2:
eh.add_entry(local_ip, *entry)
if need_change:
contents = StringIO()
if header:
contents.write("%s\n" % (header))
contents.write("%s\n" % (eh))
util.write_file(self.hosts_fn, contents.getvalue(), mode=0o644)
@property
def preferred_ntp_clients(self):
"""Allow distro to determine the preferred ntp client list"""
if not self._preferred_ntp_clients:
self._preferred_ntp_clients = list(PREFERRED_NTP_CLIENTS)
return self._preferred_ntp_clients
def _bring_up_interface(self, device_name):
cmd = ['ifup', device_name]
LOG.debug("Attempting to run bring up interface %s using command %s",
device_name, cmd)
try:
(_out, err) = subp.subp(cmd)
if len(err):
LOG.warning("Running %s resulted in stderr output: %s",
cmd, err)
return True
except subp.ProcessExecutionError:
util.logexc(LOG, "Running interface command %s failed", cmd)
return False
def _bring_up_interfaces(self, device_names):
am_failed = 0
for d in device_names:
if not self._bring_up_interface(d):
am_failed += 1
if am_failed == 0:
return True
return False
def get_default_user(self):
return self.get_option('default_user')
def add_user(self, name, **kwargs):
"""
Add a user to the system using standard GNU tools
This should be overriden on distros where useradd is not desirable or
not available.
"""
# XXX need to make add_user idempotent somehow as we
# still want to add groups or modify SSH keys on pre-existing
# users in the image.
if util.is_user(name):
LOG.info("User %s already exists, skipping.", name)
return
if 'create_groups' in kwargs:
create_groups = kwargs.pop('create_groups')
else:
create_groups = True
useradd_cmd = ['useradd', name]
log_useradd_cmd = ['useradd', name]
if util.system_is_snappy():
useradd_cmd.append('--extrausers')
log_useradd_cmd.append('--extrausers')
# Since we are creating users, we want to carefully validate the
# inputs. If something goes wrong, we can end up with a system
# that nobody can login to.
useradd_opts = {
"gecos": '--comment',
"homedir": '--home',
"primary_group": '--gid',
"uid": '--uid',
"groups": '--groups',
"passwd": '--password',
"shell": '--shell',
"expiredate": '--expiredate',
"inactive": '--inactive',
"selinux_user": '--selinux-user',
}
useradd_flags = {
"no_user_group": '--no-user-group',
"system": '--system',
"no_log_init": '--no-log-init',
}
redact_opts = ['passwd']
# support kwargs having groups=[list] or groups="g1,g2"
groups = kwargs.get('groups')
if groups:
if isinstance(groups, str):
groups = groups.split(",")
# remove any white spaces in group names, most likely
# that came in as a string like: groups: group1, group2
groups = [g.strip() for g in groups]
# kwargs.items loop below wants a comma delimeted string
# that can go right through to the command.
kwargs['groups'] = ",".join(groups)
primary_group = kwargs.get('primary_group')
if primary_group:
groups.append(primary_group)
if create_groups and groups:
for group in groups:
if not util.is_group(group):
self.create_group(group)
LOG.debug("created group '%s' for user '%s'", group, name)
# Check the values and create the command
for key, val in sorted(kwargs.items()):
if key in useradd_opts and val and isinstance(val, str):
useradd_cmd.extend([useradd_opts[key], val])
# Redact certain fields from the logs
if key in redact_opts:
log_useradd_cmd.extend([useradd_opts[key], 'REDACTED'])
else:
log_useradd_cmd.extend([useradd_opts[key], val])
elif key in useradd_flags and val:
useradd_cmd.append(useradd_flags[key])
log_useradd_cmd.append(useradd_flags[key])
# Don't create the home directory if directed so or if the user is a
# system user
if kwargs.get('no_create_home') or kwargs.get('system'):
useradd_cmd.append('-M')
log_useradd_cmd.append('-M')
else:
useradd_cmd.append('-m')
log_useradd_cmd.append('-m')
# Run the command
LOG.debug("Adding user %s", name)
try:
subp.subp(useradd_cmd, logstring=log_useradd_cmd)
except Exception as e:
util.logexc(LOG, "Failed to create user %s", name)
raise e
def add_snap_user(self, name, **kwargs):
"""
Add a snappy user to the system using snappy tools
"""
snapuser = kwargs.get('snapuser')
known = kwargs.get('known', False)
create_user_cmd = ["snap", "create-user", "--sudoer", "--json"]
if known:
create_user_cmd.append("--known")
create_user_cmd.append(snapuser)
# Run the command
LOG.debug("Adding snap user %s", name)
try:
(out, err) = subp.subp(create_user_cmd, logstring=create_user_cmd,
capture=True)
LOG.debug("snap create-user returned: %s:%s", out, err)
jobj = util.load_json(out)
username = jobj.get('username', None)
except Exception as e:
util.logexc(LOG, "Failed to create snap user %s", name)
raise e
return username
def create_user(self, name, **kwargs):
"""
Creates or partially updates the ``name`` user in the system.
This defers the actual user creation to ``self.add_user`` or
``self.add_snap_user``, and most of the keys in ``kwargs`` will be
processed there if and only if the user does not already exist.
Once the existence of the ``name`` user has been ensured, this method
then processes these keys (for both just-created and pre-existing
users):
* ``plain_text_passwd``
* ``hashed_passwd``
* ``lock_passwd``
* ``sudo``
* ``ssh_authorized_keys``
* ``ssh_redirect_user``
"""
# Add a snap user, if requested
if 'snapuser' in kwargs:
return self.add_snap_user(name, **kwargs)
# Add the user
self.add_user(name, **kwargs)
# Set password if plain-text password provided and non-empty
if 'plain_text_passwd' in kwargs and kwargs['plain_text_passwd']:
self.set_passwd(name, kwargs['plain_text_passwd'])
# Set password if hashed password is provided and non-empty
if 'hashed_passwd' in kwargs and kwargs['hashed_passwd']:
self.set_passwd(name, kwargs['hashed_passwd'], hashed=True)
# Default locking down the account. 'lock_passwd' defaults to True.
# lock account unless lock_password is False.
if kwargs.get('lock_passwd', True):
self.lock_passwd(name)
# Configure sudo access
if 'sudo' in kwargs and kwargs['sudo'] is not False:
self.write_sudo_rules(name, kwargs['sudo'])
# Import SSH keys
if 'ssh_authorized_keys' in kwargs:
# Try to handle this in a smart manner.
keys = kwargs['ssh_authorized_keys']
if isinstance(keys, str):
keys = [keys]
elif isinstance(keys, dict):
keys = list(keys.values())
if keys is not None:
if not isinstance(keys, (tuple, list, set)):
LOG.warning("Invalid type '%s' detected for"
" 'ssh_authorized_keys', expected list,"
" string, dict, or set.", type(keys))
keys = []
else:
keys = set(keys) or []
ssh_util.setup_user_keys(set(keys), name)
if 'ssh_redirect_user' in kwargs:
cloud_keys = kwargs.get('cloud_public_ssh_keys', [])
if not cloud_keys:
LOG.warning(
'Unable to disable SSH logins for %s given'
' ssh_redirect_user: %s. No cloud public-keys present.',
name, kwargs['ssh_redirect_user'])
else:
redirect_user = kwargs['ssh_redirect_user']
disable_option = ssh_util.DISABLE_USER_OPTS
disable_option = disable_option.replace('$USER', redirect_user)
disable_option = disable_option.replace('$DISABLE_USER', name)
ssh_util.setup_user_keys(
set(cloud_keys), name, options=disable_option)
return True
def lock_passwd(self, name):
"""
Lock the password of a user, i.e., disable password logins
"""
# passwd must use short '-l' due to SLES11 lacking long form '--lock'
lock_tools = (['passwd', '-l', name], ['usermod', '--lock', name])
try:
cmd = next(tool for tool in lock_tools if subp.which(tool[0]))
except StopIteration as e:
raise RuntimeError((
"Unable to lock user account '%s'. No tools available. "
" Tried: %s.") % (name, [c[0] for c in lock_tools])
) from e
try:
subp.subp(cmd)
except Exception as e:
util.logexc(LOG, 'Failed to disable password for user %s', name)
raise e
def expire_passwd(self, user):
try:
subp.subp(['passwd', '--expire', user])
except Exception as e:
util.logexc(LOG, "Failed to set 'expire' for %s", user)
raise e
def set_passwd(self, user, passwd, hashed=False):
pass_string = '%s:%s' % (user, passwd)
cmd = ['chpasswd']
if hashed:
# Need to use the short option name '-e' instead of '--encrypted'
# (which would be more descriptive) since SLES 11 doesn't know
# about long names.
cmd.append('-e')
try:
subp.subp(cmd, pass_string, logstring="chpasswd for %s" % user)
except Exception as e:
util.logexc(LOG, "Failed to set password for %s", user)
raise e
return True
def ensure_sudo_dir(self, path, sudo_base='/etc/sudoers'):
# Ensure the dir is included and that
# it actually exists as a directory
sudoers_contents = ''
base_exists = False
if os.path.exists(sudo_base):
sudoers_contents = util.load_file(sudo_base)
base_exists = True
found_include = False
for line in sudoers_contents.splitlines():
line = line.strip()
include_match = re.search(r"^#includedir\s+(.*)$", line)
if not include_match:
continue
included_dir = include_match.group(1).strip()
if not included_dir:
continue
included_dir = os.path.abspath(included_dir)
if included_dir == path:
found_include = True
break
if not found_include:
try:
if not base_exists:
lines = [('# See sudoers(5) for more information'
' on "#include" directives:'), '',
util.make_header(base="added"),
"#includedir %s" % (path), '']
sudoers_contents = "\n".join(lines)
util.write_file(sudo_base, sudoers_contents, 0o440)
else:
lines = ['', util.make_header(base="added"),
"#includedir %s" % (path), '']
sudoers_contents = "\n".join(lines)
util.append_file(sudo_base, sudoers_contents)
LOG.debug("Added '#includedir %s' to %s", path, sudo_base)
except IOError as e:
util.logexc(LOG, "Failed to write %s", sudo_base)
raise e
util.ensure_dir(path, 0o750)
def write_sudo_rules(self, user, rules, sudo_file=None):
if not sudo_file:
sudo_file = self.ci_sudoers_fn
lines = [
'',
"# User rules for %s" % user,
]
if isinstance(rules, (list, tuple)):
for rule in rules:
lines.append("%s %s" % (user, rule))
elif isinstance(rules, str):
lines.append("%s %s" % (user, rules))
else:
msg = "Can not create sudoers rule addition with type %r"
raise TypeError(msg % (type_utils.obj_name(rules)))
content = "\n".join(lines)
content += "\n" # trailing newline
self.ensure_sudo_dir(os.path.dirname(sudo_file))
if not os.path.exists(sudo_file):
contents = [
util.make_header(),
content,
]
try:
util.write_file(sudo_file, "\n".join(contents), 0o440)
except IOError as e:
util.logexc(LOG, "Failed to write sudoers file %s", sudo_file)
raise e
else:
try:
util.append_file(sudo_file, content)
except IOError as e:
util.logexc(LOG, "Failed to append sudoers file %s", sudo_file)
raise e
def create_group(self, name, members=None):
group_add_cmd = ['groupadd', name]
if util.system_is_snappy():
group_add_cmd.append('--extrausers')
if not members:
members = []
# Check if group exists, and then add it doesn't
if util.is_group(name):
LOG.warning("Skipping creation of existing group '%s'", name)
else:
try:
subp.subp(group_add_cmd)
LOG.info("Created new group %s", name)
except Exception:
util.logexc(LOG, "Failed to create group %s", name)
# Add members to the group, if so defined
if len(members) > 0:
for member in members:
if not util.is_user(member):
LOG.warning("Unable to add group member '%s' to group '%s'"
"; user does not exist.", member, name)
continue
subp.subp(['usermod', '-a', '-G', name, member])
LOG.info("Added user '%s' to group '%s'", member, name)
def _apply_hostname_transformations_to_url(url: str, transformations: list):
"""
Apply transformations to a URL's hostname, return transformed URL.
This is a separate function because unwrapping and rewrapping only the
hostname portion of a URL is complex.
:param url:
The URL to operate on.
:param transformations:
A list of ``(str) -> Optional[str]`` functions, which will be applied
in order to the hostname portion of the URL. If any function
(regardless of ordering) returns None, ``url`` will be returned without
any modification.
:return:
A string whose value is ``url`` with the hostname ``transformations``
applied, or ``None`` if ``url`` is unparseable.
"""
try:
parts = urllib.parse.urlsplit(url)
except ValueError:
# If we can't even parse the URL, we shouldn't use it for anything
return None
new_hostname = parts.hostname
if new_hostname is None:
# The URL given doesn't have a hostname component, so (a) we can't
# transform it, and (b) it won't work as a mirror; return None.
return None
for transformation in transformations:
new_hostname = transformation(new_hostname)
if new_hostname is None:
# If a transformation returns None, that indicates we should abort
# processing and return `url` unmodified
return url
new_netloc = new_hostname
if parts.port is not None:
new_netloc = "{}:{}".format(new_netloc, parts.port)
return urllib.parse.urlunsplit(parts._replace(netloc=new_netloc))
def _sanitize_mirror_url(url: str):
"""
Given a mirror URL, replace or remove any invalid URI characters.
This performs the following actions on the URL's hostname:
* Checks if it is an IP address, returning the URL immediately if it is
* Converts it to its IDN form (see below for details)
* Replaces any non-Letters/Digits/Hyphen (LDH) characters in it with
hyphens
* TODO: Remove any leading/trailing hyphens from each domain name label
Before we replace any invalid domain name characters, we first need to
ensure that any valid non-ASCII characters in the hostname will not be
replaced, by ensuring the hostname is in its Internationalized domain name
(IDN) representation (see RFC 5890). This conversion has to be applied to
the whole hostname (rather than just the substitution variables), because
the Punycode algorithm used by IDNA transcodes each part of the hostname as
a whole string (rather than encoding individual characters). It cannot be
applied to the whole URL, because (a) the Punycode algorithm expects to
operate on domain names so doesn't output a valid URL, and (b) non-ASCII
characters in non-hostname parts of the URL aren't encoded via Punycode.
To put this in RFC 5890's terminology: before we remove or replace any
characters from our domain name (which we do to ensure that each label is a
valid LDH Label), we first ensure each label is in its A-label form.
(Note that Python's builtin idna encoding is actually IDNA2003, not
IDNA2008. This changes the specifics of how some characters are encoded to
ASCII, but doesn't affect the logic here.)
:param url:
The URL to operate on.
:return:
A sanitized version of the URL, which will have been IDNA encoded if
necessary, or ``None`` if the generated string is not a parseable URL.
"""
# Acceptable characters are LDH characters, plus "." to separate each label
acceptable_chars = LDH_ASCII_CHARS + "."
transformations = [
# This is an IP address, not a hostname, so no need to apply the
# transformations
lambda hostname: None if net.is_ip_address(hostname) else hostname,
# Encode with IDNA to get the correct characters (as `bytes`), then
# decode with ASCII so we return a `str`
lambda hostname: hostname.encode('idna').decode('ascii'),
# Replace any unacceptable characters with "-"
lambda hostname: ''.join(
c if c in acceptable_chars else "-" for c in hostname
),
# Drop leading/trailing hyphens from each part of the hostname
lambda hostname: '.'.join(
part.strip('-') for part in hostname.split('.')
),
]
return _apply_hostname_transformations_to_url(url, transformations)
def _get_package_mirror_info(mirror_info, data_source=None,
mirror_filter=util.search_for_mirror):
# given a arch specific 'mirror_info' entry (from package_mirrors)
# search through the 'search' entries, and fallback appropriately
# return a dict with only {name: mirror} entries.
if not mirror_info:
mirror_info = {}
subst = {}
if data_source and data_source.availability_zone:
subst['availability_zone'] = data_source.availability_zone
# ec2 availability zones are named cc-direction-[0-9][a-d] (us-east-1b)
# the region is us-east-1. so region = az[0:-1]
if _EC2_AZ_RE.match(data_source.availability_zone):
ec2_region = data_source.availability_zone[0:-1]
if ALLOW_EC2_MIRRORS_ON_NON_AWS_INSTANCE_TYPES:
subst['ec2_region'] = "%s" % ec2_region
elif data_source.platform_type == "ec2":
subst['ec2_region'] = "%s" % ec2_region
if data_source and data_source.region:
subst['region'] = data_source.region
results = {}
for (name, mirror) in mirror_info.get('failsafe', {}).items():
results[name] = mirror
for (name, searchlist) in mirror_info.get('search', {}).items():
mirrors = []
for tmpl in searchlist:
try:
mirror = tmpl % subst
except KeyError:
continue
mirror = _sanitize_mirror_url(mirror)
if mirror is not None:
mirrors.append(mirror)
found = mirror_filter(mirrors)
if found:
results[name] = found
LOG.debug("filtered distro mirror info: %s", results)
return results
def _get_arch_package_mirror_info(package_mirrors, arch):
# pull out the specific arch from a 'package_mirrors' config option
default = None
for item in package_mirrors:
arches = item.get("arches")
if arch in arches:
return item
if "default" in arches:
default = item
return default
def fetch(name):
locs, looked_locs = importer.find_module(name, ['', __name__], ['Distro'])
if not locs:
raise ImportError("No distribution found for distro %s (searched %s)"
% (name, looked_locs))
mod = importer.import_module(locs[0])
cls = getattr(mod, 'Distro')
return cls
def set_etc_timezone(tz, tz_file=None, tz_conf="/etc/timezone",
tz_local="/etc/localtime"):
util.write_file(tz_conf, str(tz).rstrip() + "\n")
# This ensures that the correct tz will be used for the system
if tz_local and tz_file:
# use a symlink if there exists a symlink or tz_local is not present
islink = os.path.islink(tz_local)
if islink or not os.path.exists(tz_local):
if islink:
util.del_file(tz_local)
os.symlink(tz_file, tz_local)
else:
util.copy(tz_file, tz_local)
return
def uses_systemd():
try:
res = os.lstat('/run/systemd/system')
return stat.S_ISDIR(res.st_mode)
except Exception:
return False
# vi: ts=4 expandtab