#
# Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#
import re
import os
import sys
import stat
import time
import fcntl
import types
import struct
import logging
import tempfile
import subprocess
from errno import EEXIST, ENOENT, ENODATA, ENOTDIR, ELOOP, EACCES
from errno import EISDIR, ENOTEMPTY, ESTALE, EINVAL, EBUSY, EPERM
import errno
from rconf import rconf
import gsyncdconfig as gconf
import repce
from repce import RepceServer, RepceClient
from master import gmaster_builder
import syncdutils
from syncdutils import GsyncdError, select, privileged, funcode
from syncdutils import entry2pb, gauxpfx, errno_wrap, lstat
from syncdutils import NoStimeAvailable, PartialHistoryAvailable
from syncdutils import ChangelogException, ChangelogHistoryNotAvailable
from syncdutils import get_changelog_log_level, get_rsync_version
from syncdutils import CHANGELOG_AGENT_CLIENT_VERSION
from syncdutils import GX_GFID_CANONICAL_LEN
from gsyncdstatus import GeorepStatus
from syncdutils import lf, Popen, sup
from syncdutils import Xattr, matching_disk_gfid, get_gfid_from_mnt
from syncdutils import unshare_propagation_supported, get_slv_dir_path
from py2py3 import pipe, str_to_bytearray, entry_pack_reg
from py2py3 import entry_pack_reg_stat, entry_pack_mkdir, entry_pack_symlink
ENOTSUP = getattr(errno, 'ENOTSUP', 'EOPNOTSUPP')
slv_volume = None
slv_host = None
class Server(object):
"""singleton implemening those filesystem access primitives
which are needed for geo-replication functionality
(Singleton in the sense it's a class which has only static
and classmethods and is used directly, without instantiation.)
"""
GX_NSPACE_PFX = (privileged() and "trusted" or "system")
GX_NSPACE = GX_NSPACE_PFX + ".glusterfs"
NTV_FMTSTR = "!" + "B" * 19 + "II"
FRGN_XTRA_FMT = "I"
FRGN_FMTSTR = NTV_FMTSTR + FRGN_XTRA_FMT
# for backend gfid fetch, do not use GX_NSPACE_PFX
GFID_XATTR = 'trusted.gfid'
GFID_FMTSTR = "!" + "B" * 16
local_path = ''
@classmethod
def _fmt_mknod(cls, l):
return "!II%dsI%dsIII" % (GX_GFID_CANONICAL_LEN, l + 1)
@classmethod
def _fmt_mkdir(cls, l):
return "!II%dsI%dsII" % (GX_GFID_CANONICAL_LEN, l + 1)
@classmethod
def _fmt_symlink(cls, l1, l2):
return "!II%dsI%ds%ds" % (GX_GFID_CANONICAL_LEN, l1 + 1, l2 + 1)
def _pathguard(f):
"""decorator method that checks
the path argument of the decorated
functions to make sure it does not
point out of the managed tree
"""
fc = funcode(f)
pi = list(fc.co_varnames).index('path')
def ff(*args):
path = args[pi]
ps = path.split('/')
if path[0] == '/' or '..' in ps:
raise ValueError('unsafe path')
args = list(args)
args[pi] = os.path.join(args[0].local_path, path)
return f(*args)
return ff
@classmethod
@_pathguard
def entries(cls, path):
"""directory entries in an array"""
# prevent symlinks being followed
if not stat.S_ISDIR(os.lstat(path).st_mode):
raise OSError(ENOTDIR, os.strerror(ENOTDIR))
return os.listdir(path)
@classmethod
@_pathguard
def lstat(cls, path):
try:
return os.lstat(path)
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return ex.errno
else:
raise
@classmethod
@_pathguard
def linkto_check(cls, path):
try:
return not (
Xattr.lgetxattr_buf(path,
'trusted.glusterfs.dht.linkto') == '')
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA):
return False
else:
raise
@classmethod
@_pathguard
def gfid(cls, path):
buf = errno_wrap(Xattr.lgetxattr, [path, cls.GFID_XATTR, 16],
[ENOENT], [ESTALE, ENODATA])
if buf == ENOENT:
return buf
else:
buf = str_to_bytearray(buf)
m = re.match('(.{8})(.{4})(.{4})(.{4})(.{12})', "".join(
['%02x' % x for x in struct.unpack(cls.GFID_FMTSTR, buf)]))
return '-'.join(m.groups())
@classmethod
@_pathguard
def purge(cls, path, entries=None):
"""force-delete subtrees
If @entries is not specified, delete
the whole subtree under @path (including
@path).
Otherwise, @entries should be a
a sequence of children of @path, and
the effect is identical with a joint
@entries-less purge on them, ie.
for e in entries:
cls.purge(os.path.join(path, e))
"""
me_also = entries is None
if not entries:
try:
# if it's a symlink, prevent
# following it
try:
os.unlink(path)
return
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EISDIR:
entries = os.listdir(path)
else:
raise
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOTDIR, ENOENT, ELOOP):
try:
os.unlink(path)
return
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return
raise
else:
raise
for e in entries:
cls.purge(os.path.join(path, e))
if me_also:
os.rmdir(path)
@classmethod
@_pathguard
def _create(cls, path, ctor):
"""path creation backend routine"""
try:
ctor(path)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EEXIST:
cls.purge(path)
return ctor(path)
raise
@classmethod
@_pathguard
def mkdir(cls, path):
cls._create(path, os.mkdir)
@classmethod
@_pathguard
def symlink(cls, lnk, path):
cls._create(path, lambda p: os.symlink(lnk, p))
@classmethod
@_pathguard
def xtime(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
val = Xattr.lgetxattr(path,
'.'.join([cls.GX_NSPACE, uuid, 'xtime']),
8)
val = str_to_bytearray(val)
return struct.unpack('!II', val)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
@_pathguard
def stime_mnt(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
val = Xattr.lgetxattr(path,
'.'.join([cls.GX_NSPACE, uuid, 'stime']),
8)
val = str_to_bytearray(val)
return struct.unpack('!II', val)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
@_pathguard
def stime(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
val = Xattr.lgetxattr(path,
'.'.join([cls.GX_NSPACE, uuid, 'stime']),
8)
val = str_to_bytearray(val)
return struct.unpack('!II', val)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
@_pathguard
def entry_stime(cls, path, uuid):
"""
entry_stime xattr to reduce the number of retry of Entry changes when
Geo-rep worker crashes and restarts. entry_stime is updated after
processing every changelog file. On failure and restart, worker only
have to reprocess the last changelog for Entry ops.
Xattr Key: <PFX>.<MASTERVOL_UUID>.<SLAVEVOL_UUID>.entry_stime
"""
try:
val = Xattr.lgetxattr(path,
'.'.join([cls.GX_NSPACE, uuid,
'entry_stime']),
8)
val = str_to_bytearray(val)
return struct.unpack('!II', val)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
def node_uuid(cls, path='.'):
try:
uuid_l = Xattr.lgetxattr_buf(
path, '.'.join([cls.GX_NSPACE, 'node-uuid']))
return uuid_l[:-1].split(' ')
except OSError:
raise
@classmethod
@_pathguard
def set_stime(cls, path, uuid, mark):
"""set @mark as stime for @uuid on @path"""
errno_wrap(Xattr.lsetxattr,
[path,
'.'.join([cls.GX_NSPACE, uuid, 'stime']),
struct.pack('!II', *mark)],
[ENOENT],
[ESTALE, EINVAL])
@classmethod
@_pathguard
def set_entry_stime(cls, path, uuid, mark):
"""set @mark as stime for @uuid on @path"""
errno_wrap(Xattr.lsetxattr,
[path,
'.'.join([cls.GX_NSPACE, uuid, 'entry_stime']),
struct.pack('!II', *mark)],
[ENOENT],
[ESTALE, EINVAL])
@classmethod
@_pathguard
def set_xtime(cls, path, uuid, mark):
"""set @mark as xtime for @uuid on @path"""
errno_wrap(Xattr.lsetxattr,
[path,
'.'.join([cls.GX_NSPACE, uuid, 'xtime']),
struct.pack('!II', *mark)],
[ENOENT],
[ESTALE, EINVAL])
@classmethod
@_pathguard
def set_xtime_remote(cls, path, uuid, mark):
"""
set @mark as xtime for @uuid on @path
the difference b/w this and set_xtime() being
set_xtime() being overloaded to set the xtime
on the brick (this method sets xtime on the
remote slave)
"""
Xattr.lsetxattr(
path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']),
struct.pack('!II', *mark))
@classmethod
def entry_ops(cls, entries):
pfx = gauxpfx()
logging.debug('entries: %s' % repr(entries))
dist_count = rconf.args.master_dist_count
def entry_purge(op, entry, gfid, e, uid, gid):
# This is an extremely racy code and needs to be fixed ASAP.
# The GFID check here is to be sure that the pargfid/bname
# to be purged is the GFID gotten from the changelog.
# (a stat(changelog_gfid) would also be valid here)
# The race here is between the GFID check and the purge.
# If the entry or the gfid of the file to be deleted is not present
# on slave, we can ignore the unlink/rmdir
if isinstance(lstat(entry), int) or \
isinstance(lstat(os.path.join(pfx, gfid)), int):
return
if not matching_disk_gfid(gfid, entry):
collect_failure(e, EEXIST, uid, gid)
return
if op == 'UNLINK':
er = errno_wrap(os.unlink, [entry], [ENOENT, ESTALE], [EBUSY])
# EISDIR is safe error, ignore. This can only happen when
# unlink is sent from master while fixing gfid conflicts.
if er != EISDIR:
return er
elif op == 'RMDIR':
er = errno_wrap(os.rmdir, [entry], [ENOENT, ESTALE,
ENOTEMPTY], [EBUSY])
if er == ENOTEMPTY:
return er
def collect_failure(e, cmd_ret, uid, gid, dst=False):
slv_entry_info = {}
slv_entry_info['gfid_mismatch'] = False
slv_entry_info['name_mismatch'] = False
slv_entry_info['dst'] = dst
slv_entry_info['slave_isdir'] = False
slv_entry_info['slave_name'] = None
slv_entry_info['slave_gfid'] = None
# We do this for failing fops on Slave
# Master should be logging this
if cmd_ret is None:
return False
if e.get("stat", {}):
# Copy actual UID/GID value back to entry stat
e['stat']['uid'] = uid
e['stat']['gid'] = gid
if cmd_ret in [EEXIST, ESTALE]:
if dst:
en = e['entry1']
else:
en = e['entry']
disk_gfid = get_gfid_from_mnt(en)
if isinstance(disk_gfid, str) and \
e['gfid'] != disk_gfid:
slv_entry_info['gfid_mismatch'] = True
st = lstat(en)
if not isinstance(st, int):
if st and stat.S_ISDIR(st.st_mode):
slv_entry_info['slave_isdir'] = True
dir_name = get_slv_dir_path(slv_host, slv_volume,
disk_gfid)
slv_entry_info['slave_name'] = dir_name
else:
slv_entry_info['slave_isdir'] = False
slv_entry_info['slave_gfid'] = disk_gfid
failures.append((e, cmd_ret, slv_entry_info))
else:
return False
else:
failures.append((e, cmd_ret, slv_entry_info))
return True
failures = []
def recursive_rmdir(gfid, entry, path):
"""disk_gfid check added for original path for which
recursive_delete is called. This disk gfid check executed
before every Unlink/Rmdir. If disk gfid is not matching
with GFID from Changelog, that means other worker
deleted the directory. Even if the subdir/file present,
it belongs to different parent. Exit without performing
further deletes.
"""
if not matching_disk_gfid(gfid, entry):
return
names = []
names = errno_wrap(os.listdir, [path], [ENOENT], [ESTALE, ENOTSUP])
if isinstance(names, int):
return
for name in names:
fullname = os.path.join(path, name)
if not matching_disk_gfid(gfid, entry):
return
er = errno_wrap(os.remove, [fullname], [ENOENT, ESTALE,
EISDIR], [EBUSY])
if er == EISDIR:
recursive_rmdir(gfid, entry, fullname)
if not matching_disk_gfid(gfid, entry):
return
errno_wrap(os.rmdir, [path], [ENOENT, ESTALE], [EBUSY])
def rename_with_disk_gfid_confirmation(gfid, entry, en, uid, gid):
if not matching_disk_gfid(gfid, entry):
logging.error(lf("RENAME ignored: source entry does not match "
"with on-disk gfid",
source=entry,
gfid=gfid,
disk_gfid=get_gfid_from_mnt(entry),
target=en))
collect_failure(e, EEXIST, uid, gid)
return
cmd_ret = errno_wrap(os.rename,
[entry, en],
[ENOENT, EEXIST], [ESTALE, EBUSY])
collect_failure(e, cmd_ret, uid, gid)
for e in entries:
blob = None
op = e['op']
gfid = e['gfid']
entry = e['entry']
uid = 0
gid = 0
# Skip entry processing if it's marked true during gfid
# conflict resolution
if e['skip_entry']:
continue
if e.get("stat", {}):
# Copy UID/GID value and then reset to zero. Copied UID/GID
# will be used to run chown once entry is created.
uid = e['stat']['uid']
gid = e['stat']['gid']
e['stat']['uid'] = 0
e['stat']['gid'] = 0
(pg, bname) = entry2pb(entry)
if op in ['RMDIR', 'UNLINK']:
# Try once, if rmdir failed with ENOTEMPTY
# then delete recursively.
er = entry_purge(op, entry, gfid, e, uid, gid)
if isinstance(er, int):
if er == ENOTEMPTY and op == 'RMDIR':
# Retry if ENOTEMPTY, ESTALE
er1 = errno_wrap(recursive_rmdir,
[gfid, entry,
os.path.join(pg, bname)],
[], [ENOTEMPTY, ESTALE, ENODATA])
if not isinstance(er1, int):
logging.debug("Removed %s => %s/%s recursively" %
(gfid, pg, bname))
else:
logging.warn(lf("Recursive remove failed",
gfid=gfid,
pgfid=pg,
bname=bname,
error=os.strerror(er1)))
else:
logging.warn(lf("Failed to remove",
gfid=gfid,
pgfid=pg,
bname=bname,
error=os.strerror(er)))
elif op in ['CREATE', 'MKNOD']:
slink = os.path.join(pfx, gfid)
st = lstat(slink)
# don't create multiple entries with same gfid
if isinstance(st, int):
blob = entry_pack_reg(cls, gfid, bname,
e['mode'], e['uid'], e['gid'])
# Self healed hardlinks are recorded as MKNOD.
# So if the gfid already exists, it should be
# processed as hard link not mknod.
elif op in ['MKNOD']:
cmd_ret = errno_wrap(os.link,
[slink, entry],
[ENOENT, EEXIST], [ESTALE])
collect_failure(e, cmd_ret, uid, gid)
elif op == 'MKDIR':
en = e['entry']
slink = os.path.join(pfx, gfid)
st = lstat(slink)
# don't create multiple entries with same gfid
if isinstance(st, int):
blob = entry_pack_mkdir(cls, gfid, bname,
e['mode'], e['uid'], e['gid'])
elif (isinstance(lstat(en), int) or
not matching_disk_gfid(gfid, en)):
# If gfid of a directory exists on slave but path based
# create is getting EEXIST. This means the directory is
# renamed in master but recorded as MKDIR during hybrid
# crawl. Get the directory path by reading the backend
# symlink and trying to rename to new name as said by
# master.
logging.info(lf("Special case: rename on mkdir",
gfid=gfid, entry=repr(entry)))
src_entry = get_slv_dir_path(slv_host, slv_volume, gfid)
if src_entry is None:
collect_failure(e, ENOENT, uid, gid)
if src_entry is not None and src_entry != entry:
slv_entry_info = {}
slv_entry_info['gfid_mismatch'] = False
slv_entry_info['name_mismatch'] = True
slv_entry_info['dst'] = False
slv_entry_info['slave_isdir'] = True
slv_entry_info['slave_gfid'] = gfid
slv_entry_info['slave_entry'] = src_entry
failures.append((e, EEXIST, slv_entry_info))
elif op == 'LINK':
slink = os.path.join(pfx, gfid)
st = lstat(slink)
if isinstance(st, int):
(pg, bname) = entry2pb(entry)
if stat.S_ISREG(e['stat']['mode']):
blob = entry_pack_reg_stat(cls, gfid, bname, e['stat'])
elif stat.S_ISLNK(e['stat']['mode']):
blob = entry_pack_symlink(cls, gfid, bname, e['link'],
e['stat'])
else:
cmd_ret = errno_wrap(os.link,
[slink, entry],
[ENOENT, EEXIST], [ESTALE])
collect_failure(e, cmd_ret, uid, gid)
elif op == 'SYMLINK':
en = e['entry']
st = lstat(entry)
if isinstance(st, int):
blob = entry_pack_symlink(cls, gfid, bname, e['link'],
e['stat'])
elif not matching_disk_gfid(gfid, en):
collect_failure(e, EEXIST, uid, gid)
elif op == 'RENAME':
en = e['entry1']
# The matching disk gfid check validates two things
# 1. Validates name is present, return false otherwise
# 2. Validates gfid is same, returns false otherwise
# So both validations are necessary to decide src doesn't
# exist. We can't rely on only gfid stat as hardlink could
# be present and we can't rely only on name as name could
# exist with different gfid.
if not matching_disk_gfid(gfid, entry):
if e['stat'] and not stat.S_ISDIR(e['stat']['mode']):
if stat.S_ISLNK(e['stat']['mode']):
# src is not present, so don't sync symlink as
# we don't know target. It's ok to ignore. If
# it's unliked, it's fine. If it's renamed to
# something else, it will be synced then.
if e['link'] is not None:
st1 = lstat(en)
if isinstance(st1, int):
(pg, bname) = entry2pb(en)
blob = entry_pack_symlink(cls, gfid, bname,
e['link'],
e['stat'])
elif not matching_disk_gfid(gfid, en):
collect_failure(e, EEXIST, uid, gid, True)
else:
slink = os.path.join(pfx, gfid)
st = lstat(slink)
# don't create multiple entries with same gfid
if isinstance(st, int):
(pg, bname) = entry2pb(en)
blob = entry_pack_reg_stat(cls, gfid, bname,
e['stat'])
else:
cmd_ret = errno_wrap(os.link, [slink, en],
[ENOENT, EEXIST], [ESTALE])
collect_failure(e, cmd_ret, uid, gid)
else:
st = lstat(entry)
st1 = lstat(en)
if isinstance(st1, int):
rename_with_disk_gfid_confirmation(gfid, entry, en,
uid, gid)
else:
if st.st_ino == st1.st_ino:
# we have a hard link, we can now unlink source
try:
errno_wrap(os.unlink, [entry],
[ENOENT, ESTALE], [EBUSY])
except OSError as e:
if e.errno == EISDIR:
try:
errno_wrap(os.rmdir, [entry],
[ENOENT, ESTALE], [EBUSY])
except OSError as e:
if e.errno == ENOTEMPTY:
logging.error(
lf("Directory Rename failed. "
"Both Old and New"
" directories exists",
old=entry,
new=en))
else:
raise
else:
raise
elif not matching_disk_gfid(gfid, en) and dist_count > 1:
collect_failure(e, EEXIST, uid, gid, True)
else:
# We are here which means matching_disk_gfid for
# both source and destination has returned false
# and distribution count for master vol is greater
# then one. Which basically says both the source and
# destination exist and not hardlinks.
# So we are safe to go ahead with rename here.
rename_with_disk_gfid_confirmation(gfid, entry, en,
uid, gid)
if blob:
cmd_ret = errno_wrap(Xattr.lsetxattr,
[pg, 'glusterfs.gfid.newfile', blob],
[EEXIST, ENOENT, ESTALE],
[ESTALE, EINVAL, EBUSY])
collect_failure(e, cmd_ret, uid, gid)
# If UID/GID is different than zero that means we are trying
# create Entry with different UID/GID. Create Entry with
# UID:0 and GID:0, and then call chown to set UID/GID
if uid != 0 or gid != 0:
path = os.path.join(pfx, gfid)
cmd_ret = errno_wrap(os.lchown, [path, uid, gid], [ENOENT],
[ESTALE, EINVAL])
collect_failure(e, cmd_ret, uid, gid)
return failures
@classmethod
def meta_ops(cls, meta_entries):
logging.debug('Meta-entries: %s' % repr(meta_entries))
failures = []
for e in meta_entries:
mode = e['stat']['mode']
uid = e['stat']['uid']
gid = e['stat']['gid']
atime = e['stat']['atime']
mtime = e['stat']['mtime']
go = e['go']
# Linux doesn't support chmod on symlink itself.
# It is always applied to the target file. So
# changelog would record target file's gfid
# and we are good. But 'chown' is supported on
# symlink file. So changelog would record symlink
# gfid in such cases. Since we do 'chown' 'chmod'
# 'utime' for each gfid recorded for metadata, and
# we know from changelog the metadata is on symlink's
# gfid or target file's gfid, we should be doing
# 'lchown' 'lchmod' 'utime with no-deference' blindly.
# But since 'lchmod' and 'utime with no de-reference' is
# not supported in python3, we have to rely on 'chmod'
# and 'utime with de-reference'. Hence avoiding 'chmod'
# and 'utime' if it's symlink file.
is_symlink = False
cmd_ret = errno_wrap(os.lchown, [go, uid, gid], [ENOENT],
[ESTALE, EINVAL])
if isinstance(cmd_ret, int):
continue
is_symlink = os.path.islink(go)
if not is_symlink:
cmd_ret = errno_wrap(os.chmod, [go, mode],
[ENOENT, EACCES, EPERM], [ESTALE, EINVAL])
if isinstance(cmd_ret, int):
failures.append((e, cmd_ret, "chmod"))
cmd_ret = errno_wrap(os.utime, [go, (atime, mtime)],
[ENOENT, EACCES, EPERM], [ESTALE, EINVAL])
if isinstance(cmd_ret, int):
failures.append((e, cmd_ret, "utime"))
return failures
@classmethod
@_pathguard
def setattr(cls, path, adct):
"""set file attributes
@adct is a dict, where 'own', 'mode' and 'times'
keys are looked for and values used to perform
chown, chmod or utimes on @path.
"""
own = adct.get('own')
if own:
os.lchown(path, *own)
mode = adct.get('mode')
if mode:
os.chmod(path, stat.S_IMODE(mode))
times = adct.get('times')
if times:
os.utime(path, times)
@staticmethod
def pid():
return os.getpid()
last_keep_alive = 0
@classmethod
def keep_alive(cls, dct):
"""process keepalive messages.
Return keep-alive counter (number of received keep-alive
messages).
Now the "keep-alive" message can also have a payload which is
used to set a foreign volume-mark on the underlying file system.
"""
if dct:
key = '.'.join([cls.GX_NSPACE, 'volume-mark', dct['uuid']])
val = struct.pack(cls.FRGN_FMTSTR,
*(dct['version'] +
tuple(int(x, 16)
for x in re.findall('(?:[\da-f]){2}',
dct['uuid'])) +
(dct['retval'],) + dct['volume_mark'][0:2] + (
dct['timeout'],)))
Xattr.lsetxattr('.', key, val)
cls.last_keep_alive += 1
return cls.last_keep_alive
@staticmethod
def version():
"""version used in handshake"""
return 1.0
class Mounter(object):
"""Abstract base class for mounter backends"""
def __init__(self, params):
self.params = params
self.mntpt = None
self.umount_cmd = []
@classmethod
def get_glusterprog(cls):
gluster_cmd_dir = gconf.get("gluster-command-dir")
if rconf.args.subcmd == "slave":
gluster_cmd_dir = gconf.get("slave-gluster-command-dir")
return os.path.join(gluster_cmd_dir, cls.glusterprog)
def umount_l(self, d):
"""perform lazy umount"""
po = Popen(self.make_umount_argv(d), stderr=subprocess.PIPE,
universal_newlines=True)
po.wait()
return po
@classmethod
def make_umount_argv(cls, d):
raise NotImplementedError
def make_mount_argv(self, label=None):
raise NotImplementedError
def cleanup_mntpt(self, *a):
pass
def handle_mounter(self, po):
po.wait()
def inhibit(self, label):
"""inhibit a gluster filesystem
Mount glusterfs over a temporary mountpoint,
change into the mount, and lazy unmount the
filesystem.
"""
mpi, mpo = pipe()
mh = Popen.fork()
if mh:
# Parent
os.close(mpi)
fcntl.fcntl(mpo, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
d = None
margv = self.make_mount_argv(label)
if self.mntpt:
# mntpt is determined pre-mount
d = self.mntpt
mnt_msg = d + '\0'
encoded_msg = mnt_msg.encode()
os.write(mpo, encoded_msg)
po = Popen(margv, **self.mountkw)
self.handle_mounter(po)
po.terminate_geterr()
logging.debug('auxiliary glusterfs mount in place')
if not d:
# mntpt is determined during mount
d = self.mntpt
mnt_msg = d + '\0'
encoded_msg = mnt_msg.encode()
os.write(mpo, encoded_msg)
encoded_msg = 'M'.encode()
os.write(mpo, encoded_msg)
t = syncdutils.Thread(target=lambda: os.chdir(d))
t.start()
tlim = rconf.starttime + gconf.get("connection-timeout")
while True:
if not t.isAlive():
break
if time.time() >= tlim:
syncdutils.finalize(exval=1)
time.sleep(1)
os.close(mpo)
_, rv = syncdutils.waitpid(mh, 0)
if rv:
rv = (os.WIFEXITED(rv) and os.WEXITSTATUS(rv) or 0) - \
(os.WIFSIGNALED(rv) and os.WTERMSIG(rv) or 0)
logging.warn(lf('stale mount possibly left behind',
path=d))
raise GsyncdError("cleaning up temp mountpoint %s "
"failed with status %d" %
(d, rv))
else:
rv = 0
try:
os.setsid()
os.close(mpo)
mntdata = ''
while True:
c = os.read(mpi, 1)
c = c.decode()
if not c:
break
mntdata += c
if mntdata:
mounted = False
if mntdata[-1] == 'M':
mntdata = mntdata[:-1]
assert(mntdata)
mounted = True
assert(mntdata[-1] == '\0')
mntpt = mntdata[:-1]
assert(mntpt)
umount_master = False
umount_slave = False
if rconf.args.subcmd == "worker" \
and not unshare_propagation_supported() \
and not gconf.get("access-mount"):
umount_master = True
if rconf.args.subcmd == "slave" \
and not gconf.get("slave-access-mount"):
umount_slave = True
if mounted and (umount_master or umount_slave):
po = self.umount_l(mntpt)
po.terminate_geterr(fail_on_err=False)
if po.returncode != 0:
po.errlog()
rv = po.returncode
logging.debug("Lazy umount done: %s" % mntpt)
if umount_master or umount_slave:
self.cleanup_mntpt(mntpt)
except:
logging.exception('mount cleanup failure:')
rv = 200
os._exit(rv)
logging.debug('auxiliary glusterfs mount prepared')
class DirectMounter(Mounter):
"""mounter backend which calls mount(8), umount(8) directly"""
mountkw = {'stderr': subprocess.PIPE, 'universal_newlines': True}
glusterprog = 'glusterfs'
@staticmethod
def make_umount_argv(d):
return ['umount', '-l', d]
def make_mount_argv(self, label=None):
self.mntpt = tempfile.mkdtemp(prefix='gsyncd-aux-mount-')
rconf.mount_point = self.mntpt
return [self.get_glusterprog()] + \
['--' + p for p in self.params] + [self.mntpt]
def cleanup_mntpt(self, mntpt=None):
if not mntpt:
mntpt = self.mntpt
errno_wrap(os.rmdir, [mntpt], [ENOENT, EBUSY])
class MountbrokerMounter(Mounter):
"""mounter backend using the mountbroker gluster service"""
mountkw = {'stderr': subprocess.PIPE, 'stdout': subprocess.PIPE,
'universal_newlines': True}
glusterprog = 'gluster'
@classmethod
def make_cli_argv(cls):
return [cls.get_glusterprog()] + ['--remote-host=localhost'] + \
gconf.get("gluster-cli-options").split() + ['system::']
@classmethod
def make_umount_argv(cls, d):
return cls.make_cli_argv() + ['umount', d, 'lazy']
def make_mount_argv(self, label):
return self.make_cli_argv() + \
['mount', label, 'user-map-root=' +
syncdutils.getusername()] + self.params
def handle_mounter(self, po):
self.mntpt = po.stdout.readline()[:-1]
rconf.mount_point = self.mntpt
rconf.mountbroker = True
self.umount_cmd = self.make_cli_argv() + ['umount']
rconf.mbr_umount_cmd = self.umount_cmd
po.stdout.close()
sup(self, po)
if po.returncode != 0:
# if cli terminated with error due to being
# refused by glusterd, what it put
# out on stdout is a diagnostic message
logging.error(lf('glusterd answered', mnt=self.mntpt))
class GLUSTERServer(Server):
"server enhancements for a glusterfs backend"""
@classmethod
def _attr_unpack_dict(cls, xattr, extra_fields=''):
"""generic volume mark fetching/parsing backed"""
fmt_string = cls.NTV_FMTSTR + extra_fields
buf = Xattr.lgetxattr('.', xattr, struct.calcsize(fmt_string))
buf = str_to_bytearray(buf)
vm = struct.unpack(fmt_string, buf)
m = re.match(
'(.{8})(.{4})(.{4})(.{4})(.{12})',
"".join(['%02x' % x for x in vm[2:18]]))
uuid = '-'.join(m.groups())
volinfo = {'version': vm[0:2],
'uuid': uuid,
'retval': vm[18],
'volume_mark': vm[19:21],
}
if extra_fields:
return volinfo, vm[-len(extra_fields):]
else:
return volinfo
@classmethod
def foreign_volume_infos(cls):
"""return list of valid (not expired) foreign volume marks"""
dict_list = []
xattr_list = Xattr.llistxattr_buf('.')
for ele in xattr_list:
if ele.find('.'.join([cls.GX_NSPACE, 'volume-mark', ''])) == 0:
d, x = cls._attr_unpack_dict(ele, cls.FRGN_XTRA_FMT)
now = int(time.time())
if x[0] > now:
logging.debug("volinfo[%s] expires: %d "
"(%d sec later)" %
(d['uuid'], x[0], x[0] - now))
d['timeout'] = x[0]
dict_list.append(d)
else:
try:
Xattr.lremovexattr('.', ele)
except OSError:
pass
return dict_list
@classmethod
def native_volume_info(cls):
"""get the native volume mark of the underlying gluster volume"""
try:
return cls._attr_unpack_dict('.'.join([cls.GX_NSPACE,
'volume-mark']))
except OSError:
ex = sys.exc_info()[1]
if ex.errno != ENODATA:
raise
class GLUSTER(object):
"""scheme class for gluster:// urls
can be used to represent a gluster slave server
on slave side, or interface to a remote gluster
slave on master side, or to represent master
(slave-ish features come from the mixins, master
functionality is outsourced to GMaster from master)
"""
server = GLUSTERServer
def __init__(self, host, volume):
self.path = "%s:%s" % (host, volume)
self.host = host
self.volume = volume
global slv_volume
global slv_host
slv_volume = self.volume
slv_host = self.host
def connect(self):
"""inhibit the resource beyond
Choose mounting backend (direct or mountbroker),
set up glusterfs parameters and perform the mount
with given backend
"""
logging.info("Mounting gluster volume locally...")
t0 = time.time()
label = gconf.get('mountbroker', None)
if not label and not privileged():
label = syncdutils.getusername()
mounter = label and MountbrokerMounter or DirectMounter
log_file = gconf.get("gluster-log-file")
if rconf.args.subcmd == "slave":
log_file = gconf.get("slave-gluster-log-file")
log_level = gconf.get("gluster-log-level")
if rconf.args.subcmd == "slave":
log_level = gconf.get("slave-gluster-log-level")
params = gconf.get("gluster-params").split() + \
['log-level=' + log_level] + \
['log-file=' + log_file, 'volfile-server=' + self.host] + \
['volfile-id=' + self.volume, 'client-pid=-1']
self.mounter = mounter(params)
self.mounter.inhibit(label)
logging.info(lf("Mounted gluster volume",
duration="%.4f" % (time.time() - t0)))
def gmaster_instantiate_tuple(self, slave):
"""return a tuple of the 'one shot' and the 'main crawl'
class instance"""
return (gmaster_builder('xsync')(self, slave),
gmaster_builder()(self, slave),
gmaster_builder('changeloghistory')(self, slave))
def service_loop(self, slave=None):
"""enter service loop
- if slave given, instantiate GMaster and
pass control to that instance, which implements
master behavior
- else do that's what's inherited
"""
if rconf.args.subcmd == "slave":
if gconf.get("use-rsync-xattrs") and not privileged():
raise GsyncdError(
"using rsync for extended attributes is not supported")
repce = RepceServer(
self.server, sys.stdin, sys.stdout, gconf.get("sync-jobs"))
t = syncdutils.Thread(target=lambda: (repce.service_loop(),
syncdutils.finalize()))
t.start()
logging.info("slave listening")
if gconf.get("slave-timeout") and gconf.get("slave-timeout") > 0:
while True:
lp = self.server.last_keep_alive
time.sleep(gconf.get("slave-timeout"))
if lp == self.server.last_keep_alive:
logging.info(
lf("connection inactive, stopping",
timeout=gconf.get("slave-timeout")))
break
else:
select((), (), ())
return
class brickserver(Server):
local_path = rconf.args.local_path
aggregated = self.server
@classmethod
def entries(cls, path):
e = super(brickserver, cls).entries(path)
# on the brick don't mess with /.glusterfs
if path == '.':
try:
e.remove('.glusterfs')
e.remove('.trashcan')
except ValueError:
pass
return e
@classmethod
def lstat(cls, e):
""" path based backend stat """
return super(brickserver, cls).lstat(e)
@classmethod
def gfid(cls, e):
""" path based backend gfid fetch """
return super(brickserver, cls).gfid(e)
@classmethod
def linkto_check(cls, e):
return super(brickserver, cls).linkto_check(e)
# define {,set_}xtime in slave, thus preempting
# the call to remote, so that it takes data from
# the local brick
slave.server.xtime = types.MethodType(
lambda _self, path, uuid: (
brickserver.xtime(path,
uuid + '.' + rconf.args.slave_id)
),
slave.server)
slave.server.stime = types.MethodType(
lambda _self, path, uuid: (
brickserver.stime(path,
uuid + '.' + rconf.args.slave_id)
),
slave.server)
slave.server.entry_stime = types.MethodType(
lambda _self, path, uuid: (
brickserver.entry_stime(
path,
uuid + '.' + rconf.args.slave_id)
),
slave.server)
slave.server.set_stime = types.MethodType(
lambda _self, path, uuid, mark: (
brickserver.set_stime(path,
uuid + '.' + rconf.args.slave_id,
mark)
),
slave.server)
slave.server.set_entry_stime = types.MethodType(
lambda _self, path, uuid, mark: (
brickserver.set_entry_stime(
path,
uuid + '.' + rconf.args.slave_id,
mark)
),
slave.server)
(g1, g2, g3) = self.gmaster_instantiate_tuple(slave)
g1.master.server = brickserver
g2.master.server = brickserver
g3.master.server = brickserver
# bad bad bad: bad way to do things like this
# need to make this elegant
# register the crawlers and start crawling
# g1 ==> Xsync, g2 ==> config.change_detector(changelog by default)
# g3 ==> changelog History
(inf, ouf, ra, wa) = rconf.args.rpc_fd.split(',')
changelog_agent = RepceClient(int(inf), int(ouf))
status = GeorepStatus(gconf.get("state-file"),
rconf.args.local_node,
rconf.args.local_path,
rconf.args.local_node_id,
rconf.args.master,
rconf.args.slave)
status.reset_on_worker_start()
rv = changelog_agent.version()
if int(rv) != CHANGELOG_AGENT_CLIENT_VERSION:
raise GsyncdError(
"RePCe major version mismatch(changelog agent): "
"local %s, remote %s" %
(CHANGELOG_AGENT_CLIENT_VERSION, rv))
try:
workdir = g2.setup_working_dir()
# Register only when change_detector is not set to
# xsync, else agent will generate changelog files
# in .processing directory of working dir
if gconf.get("change-detector") != 'xsync':
# register with the changelog library
# 9 == log level (DEBUG)
# 5 == connection retries
changelog_agent.init()
changelog_agent.register(rconf.args.local_path,
workdir,
gconf.get("changelog-log-file"),
get_changelog_log_level(
gconf.get("changelog-log-level")),
g2.CHANGELOG_CONN_RETRIES)
register_time = int(time.time())
g2.register(register_time, changelog_agent, status)
g3.register(register_time, changelog_agent, status)
except ChangelogException as e:
logging.error(lf("Changelog register failed", error=e))
sys.exit(1)
g1.register(status=status)
logging.info(lf("Register time",
time=register_time))
# oneshot: Try to use changelog history api, if not
# available switch to FS crawl
# Note: if config.change_detector is xsync then
# it will not use changelog history api
try:
g3.crawlwrap(oneshot=True)
except PartialHistoryAvailable as e:
logging.info(lf('Partial history available, using xsync crawl'
' after consuming history',
till=e))
g1.crawlwrap(oneshot=True, register_time=register_time)
except ChangelogHistoryNotAvailable:
logging.info('Changelog history not available, using xsync')
g1.crawlwrap(oneshot=True, register_time=register_time)
except NoStimeAvailable:
logging.info('No stime available, using xsync crawl')
g1.crawlwrap(oneshot=True, register_time=register_time)
except ChangelogException as e:
logging.error(lf("Changelog History Crawl failed",
error=e))
sys.exit(1)
try:
g2.crawlwrap()
except ChangelogException as e:
logging.error(lf("Changelog crawl failed", error=e))
sys.exit(1)
class SSH(object):
"""scheme class for ssh:// urls
interface to remote slave on master side
implementing an ssh based proxy
"""
def __init__(self, host, volume):
self.remote_addr = host
self.volume = volume
@staticmethod
def parse_ssh_address(self):
m = re.match('([^@]+)@(.+)', self.remote_addr)
if m:
u, h = m.groups()
else:
u, h = syncdutils.getusername(), self.remote_addr
self.remotehost = h
return {'user': u, 'host': h}
def start_fd_client(self, i, o):
"""set up RePCe client, handshake with server
It's cut out as a separate method to let
subclasses hook into client startup
"""
self.server = RepceClient(i, o)
rv = self.server.__version__()
exrv = {'proto': repce.repce_version, 'object': Server.version()}
da0 = (rv, exrv)
da1 = ({}, {})
for i in range(2):
for k, v in da0[i].items():
da1[i][k] = int(v)
if da1[0] != da1[1]:
raise GsyncdError(
"RePCe major version mismatch: local %s, remote %s" %
(exrv, rv))
slavepath = "/proc/%d/cwd" % self.server.pid()
self.slaveurl = ':'.join([self.remote_addr, slavepath])
def connect_remote(self):
"""connect to inner slave url through outer ssh url
Wrap the connecting utility in ssh.
Much care is put into daemonizing: in that case
ssh is started before daemonization, but
RePCe client is to be created after that (as ssh
interactive password auth would be defeated by
a daemonized ssh, while client should be present
only in the final process). In that case the action
is taken apart to two parts, this method is ivoked
once pre-daemon, once post-daemon. Use @go_daemon
to deiced what part to perform.
[NB. ATM gluster product does not makes use of interactive
authentication.]
"""
syncdutils.setup_ssh_ctl(tempfile.mkdtemp(prefix='gsyncd-aux-ssh-'),
self.remote_addr,
self.volume)
logging.info("Initializing SSH connection between master and slave...")
t0 = time.time()
extra_opts = []
remote_gsyncd = gconf.get("remote-gsyncd")
if remote_gsyncd == "":
remote_gsyncd = "/nonexistent/gsyncd"
if gconf.get("use-rsync-xattrs"):
extra_opts.append('--use-rsync-xattrs')
args_to_slave = [gconf.get("ssh-command")] + \
gconf.get("ssh-options").split() + \
["-p", str(gconf.get("ssh-port"))] + \
rconf.ssh_ctl_args + [self.remote_addr] + \
[remote_gsyncd, "slave"] + \
extra_opts + \
[rconf.args.master, rconf.args.slave] + \
[
'--master-node', rconf.args.local_node,
'--master-node-id', rconf.args.local_node_id,
'--master-brick', rconf.args.local_path,
'--local-node', rconf.args.resource_remote,
'--local-node-id', rconf.args.resource_remote_id] + \
[
# Add all config arguments here, slave gsyncd will not use
# config file in slave side, so all overriding options should
# be sent as arguments
'--slave-timeout', str(gconf.get("slave-timeout")),
'--slave-log-level', gconf.get("slave-log-level"),
'--slave-gluster-log-level',
gconf.get("slave-gluster-log-level"),
'--slave-gluster-command-dir',
gconf.get("slave-gluster-command-dir"),
'--master-dist-count',
str(gconf.get("master-distribution-count"))]
if gconf.get("slave-access-mount"):
args_to_slave.append('--slave-access-mount')
if rconf.args.debug:
args_to_slave.append('--debug')
po = Popen(args_to_slave,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
rconf.transport = po
self.start_fd_client(po.stdout, po.stdin)
logging.info(lf("SSH connection between master and slave established.",
duration="%.4f" % (time.time() - t0)))
def rsync(self, files, *args, **kw):
"""invoke rsync"""
if not files:
raise GsyncdError("no files to sync")
logging.debug("files: " + ", ".join(files))
extra_rsync_flags = []
# Performance flag, --ignore-missing-args, if rsync version is
# greater than 3.1.0 then include this flag.
if gconf.get("rsync-opt-ignore-missing-args") and \
get_rsync_version(gconf.get("rsync-command")) >= "3.1.0":
extra_rsync_flags = ["--ignore-missing-args"]
rsync_ssh_opts = [gconf.get("ssh-command")] + \
gconf.get("ssh-options").split() + \
["-p", str(gconf.get("ssh-port"))] + \
rconf.ssh_ctl_args + \
gconf.get("rsync-ssh-options").split()
argv = [
gconf.get("rsync-command"),
'-aR0',
'--inplace',
'--files-from=-',
'--super',
'--stats',
'--numeric-ids',
'--no-implied-dirs'
]
if gconf.get("rsync-opt-existing"):
argv += ["--existing"]
if gconf.get("sync-xattrs"):
argv += ['--xattrs']
if gconf.get("sync-acls"):
argv += ['--acls']
argv = argv + \
gconf.get("rsync-options").split() + \
extra_rsync_flags + ['.'] + \
["-e", " ".join(rsync_ssh_opts)] + \
[self.slaveurl]
log_rsync_performance = gconf.getr("log-rsync-performance", False)
if log_rsync_performance:
# use stdout=PIPE only when log_rsync_performance enabled
# Else rsync will write to stdout and nobody is their
# to consume. If PIPE is full rsync hangs.
po = Popen(argv, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
else:
po = Popen(argv, stdin=subprocess.PIPE, stderr=subprocess.PIPE,
universal_newlines=True)
for f in files:
po.stdin.write(f)
po.stdin.write('\0')
stdout, stderr = po.communicate()
if kw.get("log_err", False):
for errline in stderr.strip().split("\n")[:-1]:
logging.error(lf("SYNC Error",
sync_engine="Rsync",
error=errline))
if log_rsync_performance:
rsync_msg = []
for line in stdout.split("\n"):
if line.startswith("Number of files:") or \
line.startswith("Number of regular files transferred:") or \
line.startswith("Total file size:") or \
line.startswith("Total transferred file size:") or \
line.startswith("Literal data:") or \
line.startswith("Matched data:") or \
line.startswith("Total bytes sent:") or \
line.startswith("Total bytes received:") or \
line.startswith("sent "):
rsync_msg.append(line)
logging.info(lf("rsync performance",
data=", ".join(rsync_msg)))
return po
def tarssh(self, files, log_err=False):
"""invoke tar+ssh
-z (compress) can be use if needed, but omitting it now
as it results in weird error (tar+ssh errors out (errcode: 2)
"""
if not files:
raise GsyncdError("no files to sync")
logging.debug("files: " + ", ".join(files))
(host, rdir) = self.slaveurl.split(':')
tar_cmd = ["tar"] + \
["--sparse", "-cf", "-", "--files-from", "-"]
ssh_cmd = gconf.get("ssh-command").split() + \
gconf.get("ssh-options-tar").split() + \
["-p", str(gconf.get("ssh-port"))] + \
[host, "tar"] + \
["--overwrite", "-xf", "-", "-C", rdir]
p0 = Popen(tar_cmd, stdout=subprocess.PIPE,
stdin=subprocess.PIPE, stderr=subprocess.PIPE,
universal_newlines=True)
p1 = Popen(ssh_cmd, stdin=p0.stdout, stderr=subprocess.PIPE,
universal_newlines=True)
for f in files:
p0.stdin.write(f)
p0.stdin.write('\n')
p0.stdin.close()
p0.stdout.close() # Allow p0 to receive a SIGPIPE if p1 exits.
# stdin and stdout of p0 is already closed, Reset to None and
# wait for child process to complete
p0.stdin = None
p0.stdout = None
def wait_for_tar(p0):
_, stderr = p0.communicate()
if log_err:
for errline in stderr.strip().split("\n")[:-1]:
if "No such file or directory" not in errline:
logging.error(lf("SYNC Error",
sync_engine="Tarssh",
error=errline))
t = syncdutils.Thread(target=wait_for_tar, args=(p0, ))
# wait for tar to terminate, collecting any errors, further
# waiting for transfer to complete
t.start()
# wait for ssh process
_, stderr1 = p1.communicate()
t.join()
if log_err:
for errline in stderr1.strip().split("\n")[:-1]:
logging.error(lf("SYNC Error",
sync_engine="Tarssh",
error=errline))
return p1