/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/syncdutils.py is in glusterfs-common 3.5.2-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import sys
import pwd
import time
import fcntl
import shutil
import logging
import socket
from threading import Lock, Thread as baseThread
from errno import EACCES, EAGAIN, EPIPE, ENOTCONN, ECONNABORTED, EINTR, ENOENT, EPERM, ESTALE, errorcode
from signal import signal, SIGTERM, SIGKILL
from time import sleep
import select as oselect
from os import waitpid as owaitpid
try:
from cPickle import PickleError
except ImportError:
# py 3
from pickle import PickleError
from gconf import gconf
try:
# py 3
from urllib import parse as urllib
except ImportError:
import urllib
try:
from hashlib import md5 as md5
except ImportError:
# py 2.4
from md5 import new as md5
# auxillary gfid based access prefix
_CL_AUX_GFID_PFX = ".gfid/"
GF_OP_RETRIES = 20
def escape(s):
"""the chosen flavor of string escaping, used all over
to turn whatever data to creatable representation"""
return urllib.quote_plus(s)
def unescape(s):
"""inverse of .escape"""
return urllib.unquote_plus(s)
def norm(s):
if s:
return s.replace('-', '_')
def update_file(path, updater, merger = lambda f: True):
"""update a file in a transaction-like manner"""
fr = fw = None
try:
fd = os.open(path, os.O_CREAT|os.O_RDWR)
try:
fr = os.fdopen(fd, 'r+b')
except:
os.close(fd)
raise
fcntl.lockf(fr, fcntl.LOCK_EX)
if not merger(fr):
return
tmpp = path + '.tmp.' + str(os.getpid())
fd = os.open(tmpp, os.O_CREAT|os.O_EXCL|os.O_WRONLY)
try:
fw = os.fdopen(fd, 'wb', 0)
except:
os.close(fd)
raise
updater(fw)
os.fsync(fd)
os.rename(tmpp, path)
finally:
for fx in (fr, fw):
if fx:
fx.close()
def create_manifest(fname, content):
"""
Create manifest file for SSH Control Path
"""
fd = None
try:
fd = os.open(fname, os.O_CREAT|os.O_RDWR)
try:
os.write(fd, content)
except:
os.close(fd)
raise
finally:
if fd != None:
os.close(fd)
def setup_ssh_ctl(ctld, remote_addr, resource_url):
"""
Setup GConf ssh control path parameters
"""
gconf.ssh_ctl_dir = ctld
content = "SLAVE_HOST=%s\nSLAVE_RESOURCE_URL=%s" % (remote_addr,
resource_url)
content_md5 = md5hex(content)
fname = os.path.join(gconf.ssh_ctl_dir,
"%s.mft" % content_md5)
create_manifest(fname, content)
ssh_ctl_path = os.path.join(gconf.ssh_ctl_dir,
"%s.sock" % content_md5)
gconf.ssh_ctl_args = ["-oControlMaster=auto", "-S", ssh_ctl_path]
def grabfile(fname, content=None):
"""open @fname + contest for its fcntl lock
@content: if given, set the file content to it
"""
# damn those messy open() mode codes
fd = os.open(fname, os.O_CREAT|os.O_RDWR)
f = os.fdopen(fd, 'r+b', 0)
try:
fcntl.lockf(f, fcntl.LOCK_EX|fcntl.LOCK_NB)
except:
ex = sys.exc_info()[1]
f.close()
if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
# cannot grab, it's taken
return
raise
if content:
try:
f.truncate()
f.write(content)
except:
f.close()
raise
gconf.permanent_handles.append(f)
return f
def grabpidfile(fname=None, setpid=True):
""".grabfile customization for pid files"""
if not fname:
fname = gconf.pid_file
content = None
if setpid:
content = str(os.getpid()) + '\n'
return grabfile(fname, content=content)
final_lock = Lock()
def finalize(*a, **kw):
"""all those messy final steps we go trough upon termination
Do away with pidfile, ssh control dir and logging.
"""
final_lock.acquire()
if getattr(gconf, 'pid_file', None):
rm_pidf = gconf.pid_file_owned
if gconf.cpid:
# exit path from parent branch of daemonization
rm_pidf = False
while True:
f = grabpidfile(setpid=False)
if not f:
# child has already taken over pidfile
break
if os.waitpid(gconf.cpid, os.WNOHANG)[0] == gconf.cpid:
# child has terminated
rm_pidf = True
break;
time.sleep(0.1)
if rm_pidf:
try:
os.unlink(gconf.pid_file)
except:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
pass
else:
raise
if gconf.ssh_ctl_dir and not gconf.cpid:
shutil.rmtree(gconf.ssh_ctl_dir)
if getattr(gconf, 'state_socket', None):
try:
os.unlink(gconf.state_socket)
except:
if sys.exc_info()[0] == OSError:
pass
if gconf.log_exit:
logging.info("exiting.")
sys.stdout.flush()
sys.stderr.flush()
os._exit(kw.get('exval', 0))
def log_raise_exception(excont):
"""top-level exception handler
Try to some fancy things to cover up we face with an error.
Translate some weird sounding but well understood exceptions
into human-friendly lingo
"""
is_filelog = False
for h in logging.getLogger().handlers:
fno = getattr(getattr(h, 'stream', None), 'fileno', None)
if fno and not os.isatty(fno()):
is_filelog = True
exc = sys.exc_info()[1]
if isinstance(exc, SystemExit):
excont.exval = exc.code or 0
raise
else:
logtag = None
if isinstance(exc, GsyncdError):
if is_filelog:
logging.error(exc.args[0])
sys.stderr.write('failure: ' + exc.args[0] + '\n')
elif isinstance(exc, PickleError) or isinstance(exc, EOFError) or \
((isinstance(exc, OSError) or isinstance(exc, IOError)) and \
exc.errno == EPIPE):
logging.error('connection to peer is broken')
if hasattr(gconf, 'transport'):
gconf.transport.wait()
if gconf.transport.returncode == 127:
logging.warn("!!!!!!!!!!!!!")
logging.warn('!!! getting "No such file or directory" errors '
"is most likely due to MISCONFIGURATION, please consult "
"https://access.redhat.com/site/documentation/en-US/Red_Hat_Storage/2.1/html/Administration_Guide/chap-User_Guide-Geo_Rep-Preparation-Settingup_Environment.html")
logging.warn("!!!!!!!!!!!!!")
gconf.transport.terminate_geterr()
elif isinstance(exc, OSError) and exc.errno in (ENOTCONN, ECONNABORTED):
logging.error('glusterfs session went down [%s]', errorcode[exc.errno])
else:
logtag = "FAIL"
if not logtag and logging.getLogger().isEnabledFor(logging.DEBUG):
logtag = "FULL EXCEPTION TRACE"
if logtag:
logging.exception(logtag + ": ")
sys.stderr.write("failed with %s.\n" % type(exc).__name__)
excont.exval = 1
sys.exit(excont.exval)
class FreeObject(object):
"""wildcard class for which any attribute can be set"""
def __init__(self, **kw):
for k,v in kw.items():
setattr(self, k, v)
class Thread(baseThread):
"""thread class flavor for gsyncd
- always a daemon thread
- force exit for whole program if thread
function coughs up an exception
"""
def __init__(self, *a, **kw):
tf = kw.get('target')
if tf:
def twrap(*aa):
excont = FreeObject(exval = 0)
try:
tf(*aa)
except:
try:
log_raise_exception(excont)
finally:
finalize(exval = excont.exval)
kw['target'] = twrap
baseThread.__init__(self, *a, **kw)
self.setDaemon(True)
class GsyncdError(Exception):
pass
def getusername(uid = None):
if uid == None:
uid = os.geteuid()
return pwd.getpwuid(uid).pw_name
def privileged():
return os.geteuid() == 0
def boolify(s):
"""
Generic string to boolean converter
return
- Quick return if string 's' is of type bool
- True if it's in true_list
- False if it's in false_list
- Warn if it's not present in either and return False
"""
true_list = ['true', 'yes', '1', 'on']
false_list = ['false', 'no', '0', 'off']
if isinstance(s, bool):
return s
rv = False
lstr = s.lower()
if lstr in true_list:
rv = True
elif not lstr in false_list:
logging.warn("Unknown string (%s) in string to boolean conversion defaulting to False\n" % (s))
return rv
def eintr_wrap(func, exc, *a):
"""
wrapper around syscalls resilient to interrupt caused
by signals
"""
while True:
try:
return func(*a)
except exc:
ex = sys.exc_info()[1]
if not ex.args[0] == EINTR:
raise
def select(*a):
return eintr_wrap(oselect.select, oselect.error, *a)
def waitpid (*a):
return eintr_wrap(owaitpid, OSError, *a)
def set_term_handler(hook=lambda *a: finalize(*a, **{'exval': 1})):
signal(SIGTERM, hook)
def is_host_local(host):
locaddr = False
for ai in socket.getaddrinfo(host, None):
# cf. http://github.com/gluster/glusterfs/blob/ce111f47/xlators/mgmt/glusterd/src/glusterd-utils.c#L125
if ai[0] == socket.AF_INET:
if ai[-1][0].split(".")[0] == "127":
locaddr = True
break
elif ai[0] == socket.AF_INET6:
if ai[-1][0] == "::1":
locaddr = True
break
else:
continue
try:
# use ICMP socket to avoid net.ipv4.ip_nonlocal_bind issue,
# cf. https://bugzilla.redhat.com/show_bug.cgi?id=890587
s = socket.socket(ai[0], socket.SOCK_RAW, socket.IPPROTO_ICMP)
except socket.error:
ex = sys.exc_info()[1]
if ex.errno != EPERM:
raise
f = None
try:
f = open("/proc/sys/net/ipv4/ip_nonlocal_bind")
if int(f.read()) != 0:
raise GsyncdError(
"non-local bind is set and not allowed to create raw sockets, "
"cannot determine if %s is local" % host)
s = socket.socket(ai[0], socket.SOCK_DGRAM)
finally:
if f:
f.close()
try:
s.bind(ai[-1])
locaddr = True
break
except:
pass
s.close()
return locaddr
def funcode(f):
fc = getattr(f, 'func_code', None)
if not fc:
# python 3
fc = f.__code__
return fc
def memoize(f):
fc = funcode(f)
fn = fc.co_name
def ff(self, *a, **kw):
rv = getattr(self, '_' + fn, None)
if rv == None:
rv = f(self, *a, **kw)
setattr(self, '_' + fn, rv)
return rv
return ff
def umask():
return os.umask(0)
def entry2pb(e):
return e.rsplit('/', 1)
def gauxpfx():
return _CL_AUX_GFID_PFX
def md5hex(s):
return md5(s).hexdigest()
def selfkill(sig=SIGTERM):
os.kill(os.getpid(), sig)
def errno_wrap(call, arg=[], errnos=[], retry_errnos=[ESTALE]):
""" wrapper around calls resilient to errnos.
retry in case of ESTALE by default.
"""
nr_tries = 0
while True:
try:
return call(*arg)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in errnos:
return ex.errno
if not ex.errno in retry_errnos:
raise
nr_tries += 1
if nr_tries == GF_OP_RETRIES:
# probably a screwed state, cannot do much...
logging.warn('reached maximum retries (%s)...' % repr(arg))
return
time.sleep(0.250) # retry the call
def lstat(e):
try:
return os.lstat(e)
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return ex.errno
else:
raise
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