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Copy pathutil.py
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2597 lines (2164 loc) · 77.9 KB
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# 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>
#
# This file is part of cloud-init. See LICENSE file for license information.
import contextlib
import copy as obj_copy
import email
import glob
import grp
import gzip
import hashlib
import io
import json
import os
import os.path
import platform
import pwd
import random
import re
import shlex
import shutil
import socket
import stat
import string
import subprocess
import sys
import time
from base64 import b64decode, b64encode
from errno import ENOENT
from functools import lru_cache
from urllib import parse
from cloudinit import importer
from cloudinit import log as logging
from cloudinit import subp
from cloudinit import (
mergers,
safeyaml,
temp_utils,
type_utils,
url_helper,
version,
)
from cloudinit.settings import CFG_BUILTIN
_DNS_REDIRECT_IP = None
LOG = logging.getLogger(__name__)
# Helps cleanup filenames to ensure they aren't FS incompatible
FN_REPLACEMENTS = {
os.sep: '_',
}
FN_ALLOWED = ('_-.()' + string.digits + string.ascii_letters)
TRUE_STRINGS = ('true', '1', 'on', 'yes')
FALSE_STRINGS = ('off', '0', 'no', 'false')
def kernel_version():
return tuple(map(int, os.uname().release.split('.')[:2]))
@lru_cache()
def get_dpkg_architecture(target=None):
"""Return the sanitized string output by `dpkg --print-architecture`.
N.B. This function is wrapped in functools.lru_cache, so repeated calls
won't shell out every time.
"""
out, _ = subp.subp(['dpkg', '--print-architecture'], capture=True,
target=target)
return out.strip()
@lru_cache()
def lsb_release(target=None):
fmap = {'Codename': 'codename', 'Description': 'description',
'Distributor ID': 'id', 'Release': 'release'}
data = {}
try:
out, _ = subp.subp(['lsb_release', '--all'], capture=True,
target=target)
for line in out.splitlines():
fname, _, val = line.partition(":")
if fname in fmap:
data[fmap[fname]] = val.strip()
missing = [k for k in fmap.values() if k not in data]
if len(missing):
LOG.warning("Missing fields in lsb_release --all output: %s",
','.join(missing))
except subp.ProcessExecutionError as err:
LOG.warning("Unable to get lsb_release --all: %s", err)
data = dict((v, "UNAVAILABLE") for v in fmap.values())
return data
def decode_binary(blob, encoding='utf-8'):
# Converts a binary type into a text type using given encoding.
if isinstance(blob, str):
return blob
return blob.decode(encoding)
def encode_text(text, encoding='utf-8'):
# Converts a text string into a binary type using given encoding.
if isinstance(text, bytes):
return text
return text.encode(encoding)
def b64d(source):
# Base64 decode some data, accepting bytes or unicode/str, and returning
# str/unicode if the result is utf-8 compatible, otherwise returning bytes.
decoded = b64decode(source)
try:
return decoded.decode('utf-8')
except UnicodeDecodeError:
return decoded
def b64e(source):
# Base64 encode some data, accepting bytes or unicode/str, and returning
# str/unicode if the result is utf-8 compatible, otherwise returning bytes.
if not isinstance(source, bytes):
source = source.encode('utf-8')
return b64encode(source).decode('utf-8')
def fully_decoded_payload(part):
# In Python 3, decoding the payload will ironically hand us a bytes object.
# 'decode' means to decode according to Content-Transfer-Encoding, not
# according to any charset in the Content-Type. So, if we end up with
# bytes, first try to decode to str via CT charset, and failing that, try
# utf-8 using surrogate escapes.
cte_payload = part.get_payload(decode=True)
if (part.get_content_maintype() == 'text' and
isinstance(cte_payload, bytes)):
charset = part.get_charset()
if charset and charset.input_codec:
encoding = charset.input_codec
else:
encoding = 'utf-8'
return cte_payload.decode(encoding, 'surrogateescape')
return cte_payload
class SeLinuxGuard(object):
def __init__(self, path, recursive=False):
# Late import since it might not always
# be possible to use this
try:
self.selinux = importer.import_module('selinux')
except ImportError:
self.selinux = None
self.path = path
self.recursive = recursive
def __enter__(self):
if self.selinux and self.selinux.is_selinux_enabled():
return True
else:
return False
def __exit__(self, excp_type, excp_value, excp_traceback):
if not self.selinux or not self.selinux.is_selinux_enabled():
return
if not os.path.lexists(self.path):
return
path = os.path.realpath(self.path)
try:
stats = os.lstat(path)
self.selinux.matchpathcon(path, stats[stat.ST_MODE])
except OSError:
return
LOG.debug("Restoring selinux mode for %s (recursive=%s)",
path, self.recursive)
try:
self.selinux.restorecon(path, recursive=self.recursive)
except OSError as e:
LOG.warning('restorecon failed on %s,%s maybe badness? %s',
path, self.recursive, e)
class MountFailedError(Exception):
pass
class DecompressionError(Exception):
pass
def fork_cb(child_cb, *args, **kwargs):
fid = os.fork()
if fid == 0:
try:
child_cb(*args, **kwargs)
os._exit(0)
except Exception:
logexc(LOG, "Failed forking and calling callback %s",
type_utils.obj_name(child_cb))
os._exit(1)
else:
LOG.debug("Forked child %s who will run callback %s",
fid, type_utils.obj_name(child_cb))
def is_true(val, addons=None):
if isinstance(val, (bool)):
return val is True
check_set = TRUE_STRINGS
if addons:
check_set = list(check_set) + addons
if str(val).lower().strip() in check_set:
return True
return False
def is_false(val, addons=None):
if isinstance(val, (bool)):
return val is False
check_set = FALSE_STRINGS
if addons:
check_set = list(check_set) + addons
if str(val).lower().strip() in check_set:
return True
return False
def translate_bool(val, addons=None):
if not val:
# This handles empty lists and false and
# other things that python believes are false
return False
# If its already a boolean skip
if isinstance(val, (bool)):
return val
return is_true(val, addons)
def rand_str(strlen=32, select_from=None):
r = random.SystemRandom()
if not select_from:
select_from = string.ascii_letters + string.digits
return "".join([r.choice(select_from) for _x in range(0, strlen)])
def rand_dict_key(dictionary, postfix=None):
if not postfix:
postfix = ""
while True:
newkey = rand_str(strlen=8) + "_" + postfix
if newkey not in dictionary:
break
return newkey
def read_conf(fname):
try:
return load_yaml(load_file(fname), default={})
except IOError as e:
if e.errno == ENOENT:
return {}
else:
raise
# Merges X lists, and then keeps the
# unique ones, but orders by sort order
# instead of by the original order
def uniq_merge_sorted(*lists):
return sorted(uniq_merge(*lists))
# Merges X lists and then iterates over those
# and only keeps the unique items (order preserving)
# and returns that merged and uniqued list as the
# final result.
#
# Note: if any entry is a string it will be
# split on commas and empty entries will be
# evicted and merged in accordingly.
def uniq_merge(*lists):
combined_list = []
for a_list in lists:
if isinstance(a_list, str):
a_list = a_list.strip().split(",")
# Kickout the empty ones
a_list = [a for a in a_list if len(a)]
combined_list.extend(a_list)
return uniq_list(combined_list)
def clean_filename(fn):
for (k, v) in FN_REPLACEMENTS.items():
fn = fn.replace(k, v)
removals = []
for k in fn:
if k not in FN_ALLOWED:
removals.append(k)
for k in removals:
fn = fn.replace(k, '')
fn = fn.strip()
return fn
def decomp_gzip(data, quiet=True, decode=True):
try:
buf = io.BytesIO(encode_text(data))
with contextlib.closing(gzip.GzipFile(None, "rb", 1, buf)) as gh:
# E1101 is https://github.com/PyCQA/pylint/issues/1444
if decode:
return decode_binary(gh.read()) # pylint: disable=E1101
else:
return gh.read() # pylint: disable=E1101
except Exception as e:
if quiet:
return data
else:
raise DecompressionError(str(e)) from e
def extract_usergroup(ug_pair):
if not ug_pair:
return (None, None)
ug_parted = ug_pair.split(':', 1)
u = ug_parted[0].strip()
if len(ug_parted) == 2:
g = ug_parted[1].strip()
else:
g = None
if not u or u == "-1" or u.lower() == "none":
u = None
if not g or g == "-1" or g.lower() == "none":
g = None
return (u, g)
def find_modules(root_dir):
entries = dict()
for fname in glob.glob(os.path.join(root_dir, "*.py")):
if not os.path.isfile(fname):
continue
modname = os.path.basename(fname)[0:-3]
modname = modname.strip()
if modname and modname.find(".") == -1:
entries[fname] = modname
return entries
def multi_log(text, console=True, stderr=True,
log=None, log_level=logging.DEBUG):
if stderr:
sys.stderr.write(text)
if console:
conpath = "/dev/console"
if os.path.exists(conpath):
with open(conpath, 'w') as wfh:
wfh.write(text)
wfh.flush()
else:
# A container may lack /dev/console (arguably a container bug). If
# it does not exist, then write output to stdout. this will result
# in duplicate stderr and stdout messages if stderr was True.
#
# even though upstart or systemd might have set up output to go to
# /dev/console, the user may have configured elsewhere via
# cloud-config 'output'. If there is /dev/console, messages will
# still get there.
sys.stdout.write(text)
if log:
if text[-1] == "\n":
log.log(log_level, text[:-1])
else:
log.log(log_level, text)
@lru_cache()
def is_Linux():
return 'Linux' in platform.system()
@lru_cache()
def is_BSD():
return 'BSD' in platform.system()
@lru_cache()
def is_FreeBSD():
return system_info()['variant'] == "freebsd"
@lru_cache()
def is_NetBSD():
return system_info()['variant'] == "netbsd"
@lru_cache()
def is_OpenBSD():
return system_info()['variant'] == "openbsd"
def get_cfg_option_bool(yobj, key, default=False):
if key not in yobj:
return default
return translate_bool(yobj[key])
def get_cfg_option_str(yobj, key, default=None):
if key not in yobj:
return default
val = yobj[key]
if not isinstance(val, str):
val = str(val)
return val
def get_cfg_option_int(yobj, key, default=0):
return int(get_cfg_option_str(yobj, key, default=default))
def _parse_redhat_release(release_file=None):
"""Return a dictionary of distro info fields from /etc/redhat-release.
Dict keys will align with /etc/os-release keys:
ID, VERSION_ID, VERSION_CODENAME
"""
if not release_file:
release_file = '/etc/redhat-release'
if not os.path.exists(release_file):
return {}
redhat_release = load_file(release_file)
redhat_regex = (
r'(?P<name>.+) release (?P<version>[\d\.]+) '
r'\((?P<codename>[^)]+)\)')
match = re.match(redhat_regex, redhat_release)
if match:
group = match.groupdict()
group['name'] = group['name'].lower().partition(' linux')[0]
if group['name'] == 'red hat enterprise':
group['name'] = 'redhat'
return {'ID': group['name'], 'VERSION_ID': group['version'],
'VERSION_CODENAME': group['codename']}
return {}
@lru_cache()
def get_linux_distro():
distro_name = ''
distro_version = ''
flavor = ''
os_release = {}
if os.path.exists('/etc/os-release'):
os_release = load_shell_content(load_file('/etc/os-release'))
if not os_release:
os_release = _parse_redhat_release()
if os_release:
distro_name = os_release.get('ID', '')
distro_version = os_release.get('VERSION_ID', '')
if 'sles' in distro_name or 'suse' in distro_name:
# RELEASE_BLOCKER: We will drop this sles divergent behavior in
# the future so that get_linux_distro returns a named tuple
# which will include both version codename and architecture
# on all distributions.
flavor = platform.machine()
else:
flavor = os_release.get('VERSION_CODENAME', '')
if not flavor:
match = re.match(r'[^ ]+ \((?P<codename>[^)]+)\)',
os_release.get('VERSION', ''))
if match:
flavor = match.groupdict()['codename']
if distro_name == 'rhel':
distro_name = 'redhat'
elif is_BSD():
distro_name = platform.system().lower()
distro_version = platform.release()
else:
dist = ('', '', '')
try:
# Was removed in 3.8
dist = platform.dist() # pylint: disable=W1505,E1101
except Exception:
pass
finally:
found = None
for entry in dist:
if entry:
found = 1
if not found:
LOG.warning('Unable to determine distribution, template '
'expansion may have unexpected results')
return dist
return (distro_name, distro_version, flavor)
@lru_cache()
def system_info():
info = {
'platform': platform.platform(),
'system': platform.system(),
'release': platform.release(),
'python': platform.python_version(),
'uname': list(platform.uname()),
'dist': get_linux_distro()
}
system = info['system'].lower()
var = 'unknown'
if system == "linux":
linux_dist = info['dist'][0].lower()
if linux_dist in (
'alpine', 'arch', 'centos', 'debian', 'fedora', 'rhel',
'suse'):
var = linux_dist
elif linux_dist in ('ubuntu', 'linuxmint', 'mint'):
var = 'ubuntu'
elif linux_dist == 'redhat':
var = 'rhel'
elif linux_dist in (
'opensuse', 'opensuse-tumbleweed', 'opensuse-leap',
'sles', 'sle_hpc'):
var = 'suse'
else:
var = 'linux'
elif system in ('windows', 'darwin', "freebsd", "netbsd", "openbsd"):
var = system
info['variant'] = var
return info
def get_cfg_option_list(yobj, key, default=None):
"""
Gets the C{key} config option from C{yobj} as a list of strings. If the
key is present as a single string it will be returned as a list with one
string arg.
@param yobj: The configuration object.
@param key: The configuration key to get.
@param default: The default to return if key is not found.
@return: The configuration option as a list of strings or default if key
is not found.
"""
if key not in yobj:
return default
if yobj[key] is None:
return []
val = yobj[key]
if isinstance(val, (list)):
cval = [v for v in val]
return cval
if not isinstance(val, str):
val = str(val)
return [val]
# get a cfg entry by its path array
# for f['a']['b']: get_cfg_by_path(mycfg,('a','b'))
def get_cfg_by_path(yobj, keyp, default=None):
"""Return the value of the item at path C{keyp} in C{yobj}.
example:
get_cfg_by_path({'a': {'b': {'num': 4}}}, 'a/b/num') == 4
get_cfg_by_path({'a': {'b': {'num': 4}}}, 'c/d') == None
@param yobj: A dictionary.
@param keyp: A path inside yobj. it can be a '/' delimited string,
or an iterable.
@param default: The default to return if the path does not exist.
@return: The value of the item at keyp."
is not found."""
if isinstance(keyp, str):
keyp = keyp.split("/")
cur = yobj
for tok in keyp:
if tok not in cur:
return default
cur = cur[tok]
return cur
def fixup_output(cfg, mode):
(outfmt, errfmt) = get_output_cfg(cfg, mode)
redirect_output(outfmt, errfmt)
return (outfmt, errfmt)
# redirect_output(outfmt, errfmt, orig_out, orig_err)
# replace orig_out and orig_err with filehandles specified in outfmt or errfmt
# fmt can be:
# > FILEPATH
# >> FILEPATH
# | program [ arg1 [ arg2 [ ... ] ] ]
#
# with a '|', arguments are passed to shell, so one level of
# shell escape is required.
#
# if _CLOUD_INIT_SAVE_STDOUT is set in environment to a non empty and true
# value then output input will not be closed (useful for debugging).
#
def redirect_output(outfmt, errfmt, o_out=None, o_err=None):
if is_true(os.environ.get("_CLOUD_INIT_SAVE_STDOUT")):
LOG.debug("Not redirecting output due to _CLOUD_INIT_SAVE_STDOUT")
return
if not o_out:
o_out = sys.stdout
if not o_err:
o_err = sys.stderr
if outfmt:
LOG.debug("Redirecting %s to %s", o_out, outfmt)
(mode, arg) = outfmt.split(" ", 1)
if mode == ">" or mode == ">>":
owith = "ab"
if mode == ">":
owith = "wb"
new_fp = open(arg, owith)
elif mode == "|":
proc = subprocess.Popen(arg, shell=True, stdin=subprocess.PIPE)
new_fp = proc.stdin
else:
raise TypeError("Invalid type for output format: %s" % outfmt)
if o_out:
os.dup2(new_fp.fileno(), o_out.fileno())
if errfmt == outfmt:
LOG.debug("Redirecting %s to %s", o_err, outfmt)
os.dup2(new_fp.fileno(), o_err.fileno())
return
if errfmt:
LOG.debug("Redirecting %s to %s", o_err, errfmt)
(mode, arg) = errfmt.split(" ", 1)
if mode == ">" or mode == ">>":
owith = "ab"
if mode == ">":
owith = "wb"
new_fp = open(arg, owith)
elif mode == "|":
proc = subprocess.Popen(arg, shell=True, stdin=subprocess.PIPE)
new_fp = proc.stdin
else:
raise TypeError("Invalid type for error format: %s" % errfmt)
if o_err:
os.dup2(new_fp.fileno(), o_err.fileno())
def make_url(scheme, host, port=None,
path='', params='', query='', fragment=''):
pieces = [scheme or '']
netloc = ''
if host:
netloc = str(host)
if port is not None:
netloc += ":" + "%s" % (port)
pieces.append(netloc or '')
pieces.append(path or '')
pieces.append(params or '')
pieces.append(query or '')
pieces.append(fragment or '')
return parse.urlunparse(pieces)
def mergemanydict(srcs, reverse=False):
if reverse:
srcs = reversed(srcs)
merged_cfg = {}
for cfg in srcs:
if cfg:
# Figure out which mergers to apply...
mergers_to_apply = mergers.dict_extract_mergers(cfg)
if not mergers_to_apply:
mergers_to_apply = mergers.default_mergers()
merger = mergers.construct(mergers_to_apply)
merged_cfg = merger.merge(merged_cfg, cfg)
return merged_cfg
@contextlib.contextmanager
def chdir(ndir):
curr = os.getcwd()
try:
os.chdir(ndir)
yield ndir
finally:
os.chdir(curr)
@contextlib.contextmanager
def umask(n_msk):
old = os.umask(n_msk)
try:
yield old
finally:
os.umask(old)
def center(text, fill, max_len):
return '{0:{fill}{align}{size}}'.format(text, fill=fill,
align="^", size=max_len)
def del_dir(path):
LOG.debug("Recursively deleting %s", path)
shutil.rmtree(path)
# read_optional_seed
# returns boolean indicating success or failure (presense of files)
# if files are present, populates 'fill' dictionary with 'user-data' and
# 'meta-data' entries
def read_optional_seed(fill, base="", ext="", timeout=5):
try:
(md, ud, vd) = read_seeded(base, ext, timeout)
fill['user-data'] = ud
fill['vendor-data'] = vd
fill['meta-data'] = md
return True
except url_helper.UrlError as e:
if e.code == url_helper.NOT_FOUND:
return False
raise
def fetch_ssl_details(paths=None):
ssl_details = {}
# Lookup in these locations for ssl key/cert files
ssl_cert_paths = [
'/var/lib/cloud/data/ssl',
'/var/lib/cloud/instance/data/ssl',
]
if paths:
ssl_cert_paths.extend([
os.path.join(paths.get_ipath_cur('data'), 'ssl'),
os.path.join(paths.get_cpath('data'), 'ssl'),
])
ssl_cert_paths = uniq_merge(ssl_cert_paths)
ssl_cert_paths = [d for d in ssl_cert_paths if d and os.path.isdir(d)]
cert_file = None
for d in ssl_cert_paths:
if os.path.isfile(os.path.join(d, 'cert.pem')):
cert_file = os.path.join(d, 'cert.pem')
break
key_file = None
for d in ssl_cert_paths:
if os.path.isfile(os.path.join(d, 'key.pem')):
key_file = os.path.join(d, 'key.pem')
break
if cert_file and key_file:
ssl_details['cert_file'] = cert_file
ssl_details['key_file'] = key_file
elif cert_file:
ssl_details['cert_file'] = cert_file
return ssl_details
def load_yaml(blob, default=None, allowed=(dict,)):
loaded = default
blob = decode_binary(blob)
try:
LOG.debug("Attempting to load yaml from string "
"of length %s with allowed root types %s",
len(blob), allowed)
converted = safeyaml.load(blob)
if converted is None:
LOG.debug("loaded blob returned None, returning default.")
converted = default
elif not isinstance(converted, allowed):
# Yes this will just be caught, but thats ok for now...
raise TypeError(("Yaml load allows %s root types,"
" but got %s instead") %
(allowed, type_utils.obj_name(converted)))
loaded = converted
except (safeyaml.YAMLError, TypeError, ValueError) as e:
msg = 'Failed loading yaml blob'
mark = None
if hasattr(e, 'context_mark') and getattr(e, 'context_mark'):
mark = getattr(e, 'context_mark')
elif hasattr(e, 'problem_mark') and getattr(e, 'problem_mark'):
mark = getattr(e, 'problem_mark')
if mark:
msg += (
'. Invalid format at line {line} column {col}: "{err}"'.format(
line=mark.line + 1, col=mark.column + 1, err=e))
else:
msg += '. {err}'.format(err=e)
LOG.warning(msg)
return loaded
def read_seeded(base="", ext="", timeout=5, retries=10, file_retries=0):
if base.find("%s") >= 0:
ud_url = base % ("user-data" + ext)
vd_url = base % ("vendor-data" + ext)
md_url = base % ("meta-data" + ext)
else:
ud_url = "%s%s%s" % (base, "user-data", ext)
vd_url = "%s%s%s" % (base, "vendor-data", ext)
md_url = "%s%s%s" % (base, "meta-data", ext)
md_resp = url_helper.read_file_or_url(md_url, timeout=timeout,
retries=retries)
md = None
if md_resp.ok():
md = load_yaml(decode_binary(md_resp.contents), default={})
ud_resp = url_helper.read_file_or_url(ud_url, timeout=timeout,
retries=retries)
ud = None
if ud_resp.ok():
ud = ud_resp.contents
vd = None
try:
vd_resp = url_helper.read_file_or_url(vd_url, timeout=timeout,
retries=retries)
except url_helper.UrlError as e:
LOG.debug("Error in vendor-data response: %s", e)
else:
if vd_resp.ok():
vd = vd_resp.contents
else:
LOG.debug("Error in vendor-data response")
return (md, ud, vd)
def read_conf_d(confd):
# Get reverse sorted list (later trumps newer)
confs = sorted(os.listdir(confd), reverse=True)
# Remove anything not ending in '.cfg'
confs = [f for f in confs if f.endswith(".cfg")]
# Remove anything not a file
confs = [f for f in confs
if os.path.isfile(os.path.join(confd, f))]
# Load them all so that they can be merged
cfgs = []
for fn in confs:
cfgs.append(read_conf(os.path.join(confd, fn)))
return mergemanydict(cfgs)
def read_conf_with_confd(cfgfile):
cfg = read_conf(cfgfile)
confd = False
if "conf_d" in cfg:
confd = cfg['conf_d']
if confd:
if not isinstance(confd, str):
raise TypeError(("Config file %s contains 'conf_d' "
"with non-string type %s") %
(cfgfile, type_utils.obj_name(confd)))
else:
confd = str(confd).strip()
elif os.path.isdir("%s.d" % cfgfile):
confd = "%s.d" % cfgfile
if not confd or not os.path.isdir(confd):
return cfg
# Conf.d settings override input configuration
confd_cfg = read_conf_d(confd)
return mergemanydict([confd_cfg, cfg])
def read_conf_from_cmdline(cmdline=None):
# return a dictionary of config on the cmdline or None
return load_yaml(read_cc_from_cmdline(cmdline=cmdline))
def read_cc_from_cmdline(cmdline=None):
# this should support reading cloud-config information from
# the kernel command line. It is intended to support content of the
# format:
# cc: <yaml content here|urlencoded yaml content> [end_cc]
# this would include:
# cc: ssh_import_id: [smoser, kirkland]\\n
# cc: ssh_import_id: [smoser, bob]\\nruncmd: [ [ ls, -l ], echo hi ] end_cc
# cc:ssh_import_id: [smoser] end_cc cc:runcmd: [ [ ls, -l ] ] end_cc
# cc:ssh_import_id: %5Bsmoser%5D end_cc
if cmdline is None:
cmdline = get_cmdline()
tag_begin = "cc:"
tag_end = "end_cc"
begin_l = len(tag_begin)
end_l = len(tag_end)
clen = len(cmdline)
tokens = []
begin = cmdline.find(tag_begin)
while begin >= 0:
end = cmdline.find(tag_end, begin + begin_l)
if end < 0:
end = clen
tokens.append(
parse.unquote(
cmdline[begin + begin_l:end].lstrip()).replace("\\n", "\n"))
begin = cmdline.find(tag_begin, end + end_l)
return '\n'.join(tokens)
def dos2unix(contents):
# find first end of line
pos = contents.find('\n')
if pos <= 0 or contents[pos - 1] != '\r':
return contents
return contents.replace('\r\n', '\n')
def get_hostname_fqdn(cfg, cloud, metadata_only=False):
"""Get hostname and fqdn from config if present and fallback to cloud.
@param cfg: Dictionary of merged user-data configuration (from init.cfg).
@param cloud: Cloud instance from init.cloudify().
@param metadata_only: Boolean, set True to only query cloud meta-data,
returning None if not present in meta-data.
@return: a Tuple of strings <hostname>, <fqdn>. Values can be none when
metadata_only is True and no cfg or metadata provides hostname info.
"""
if "fqdn" in cfg:
# user specified a fqdn. Default hostname then is based off that
fqdn = cfg['fqdn']
hostname = get_cfg_option_str(cfg, "hostname", fqdn.split('.')[0])
else:
if "hostname" in cfg and cfg['hostname'].find('.') > 0:
# user specified hostname, and it had '.' in it
# be nice to them. set fqdn and hostname from that
fqdn = cfg['hostname']
hostname = cfg['hostname'][:fqdn.find('.')]
else:
# no fqdn set, get fqdn from cloud.
# get hostname from cfg if available otherwise cloud
fqdn = cloud.get_hostname(fqdn=True, metadata_only=metadata_only)
if "hostname" in cfg:
hostname = cfg['hostname']
else:
hostname = cloud.get_hostname(metadata_only=metadata_only)
return (hostname, fqdn)
def get_fqdn_from_hosts(hostname, filename="/etc/hosts"):
"""
For each host a single line should be present with
the following information:
IP_address canonical_hostname [aliases...]
Fields of the entry are separated by any number of blanks and/or tab
characters. Text from a "#" character until the end of the line is a
comment, and is ignored. Host names may contain only alphanumeric
characters, minus signs ("-"), and periods ("."). They must begin with
an alphabetic character and end with an alphanumeric character.
Optional aliases provide for name changes, alternate spellings, shorter
hostnames, or generic hostnames (for example, localhost).
"""
fqdn = None
try:
for line in load_file(filename).splitlines():
hashpos = line.find("#")
if hashpos >= 0:
line = line[0:hashpos]
line = line.strip()
if not line:
continue
# If there there is less than 3 entries
# (IP_address, canonical_hostname, alias)
# then ignore this line
toks = line.split()
if len(toks) < 3:
continue