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usr / lib / python3.6 / site-packages / dnf /

?? ..
?? __init__.py(1.36 KB)
?? __pycache__
?? base.py(114.74 KB)
?? callback.py(3.64 KB)
?? cli
?? comps.py(24.24 KB)
?? conf
?? const.py(2.31 KB)
?? crypto.py(5.98 KB)
?? db
?? dnssec.py(11.06 KB)
?? drpm.py(6.2 KB)
?? exceptions.py(5.71 KB)
?? goal.py(1.08 KB)
?? history.py(1.12 KB)
?? i18n.py(12.03 KB)
?? lock.py(5.2 KB)
?? logging.py(10.11 KB)
?? match_counter.py(3.83 KB)
?? module
?? package.py(10.94 KB)
?? persistor.py(4.61 KB)
?? plugin.py(9.33 KB)
?? pycomp.py(3.52 KB)
?? query.py(1.55 KB)
?? repo.py(20.32 KB)
?? repodict.py(5.04 KB)
?? rpm
?? sack.py(2.97 KB)
?? selector.py(1.1 KB)
?? subject.py(1.12 KB)
?? transaction.py(4.29 KB)
?? transaction_sr.py(25.59 KB)
?? util.py(19.9 KB)
?? yum

Editing: lock.py

# lock.py
# DNF Locking Subsystem.
#
# Copyright (C) 2013-2016 Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.  You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#

from __future__ import absolute_import
from __future__ import unicode_literals
from dnf.exceptions import ProcessLockError, ThreadLockError, LockError
from dnf.i18n import _
from dnf.yum import misc
import dnf.logging
import dnf.util
import errno
import fcntl
import hashlib
import logging
import os
import threading
import time

logger = logging.getLogger("dnf")

def _fit_lock_dir(dir_):
    if not dnf.util.am_i_root():
        # for regular users the best we currently do is not to clash with
        # another DNF process of the same user. Since dir_ is quite definitely
        # not writable for us, yet significant, use its hash:
        hexdir = hashlib.sha1(dir_.encode('utf-8')).hexdigest()
        dir_ = os.path.join(misc.getCacheDir(), 'locks', hexdir)
    return dir_

def build_download_lock(cachedir, exit_on_lock):
    return ProcessLock(os.path.join(_fit_lock_dir(cachedir), 'download_lock.pid'),
                       'cachedir', not exit_on_lock)

def build_metadata_lock(cachedir, exit_on_lock):
    return ProcessLock(os.path.join(_fit_lock_dir(cachedir), 'metadata_lock.pid'),
                       'metadata', not exit_on_lock)

def build_rpmdb_lock(persistdir, exit_on_lock):
    return ProcessLock(os.path.join(_fit_lock_dir(persistdir), 'rpmdb_lock.pid'),
                       'RPMDB', not exit_on_lock)

def build_log_lock(logdir, exit_on_lock):
    return ProcessLock(os.path.join(_fit_lock_dir(logdir), 'log_lock.pid'),
                       'log', not exit_on_lock)

class ProcessLock(object):
    def __init__(self, target, description, blocking=False):
        self.blocking = blocking
        self.count = 0
        self.description = description
        self.target = target
        self.thread_lock = threading.RLock()

def _lock_thread(self):
        if not self.thread_lock.acquire(blocking=False):
            msg = '%s already locked by a different thread' % self.description
            raise ThreadLockError(msg)
        self.count += 1

def _try_lock(self, pid):
        fd = os.open(self.target, os.O_CREAT | os.O_RDWR, 0o644)

try:
            try:
                fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
            except OSError as e:
                if e.errno == errno.EWOULDBLOCK:
                    return -1
                raise

old_pid = os.read(fd, 20)
            if len(old_pid) == 0:
                # empty file, write our pid
                os.write(fd, str(pid).encode('utf-8'))
                return pid

try:
                old_pid = int(old_pid)
            except ValueError:
                msg = _('Malformed lock file found: %s.\n'
                        'Ensure no other dnf/yum process is running and '
                        'remove the lock file manually or run '
                        'systemd-tmpfiles --remove dnf.conf.') % (self.target)
                raise LockError(msg)

if old_pid == pid:
                # already locked by this process
                return pid

if not os.access('/proc/%d/stat' % old_pid, os.F_OK):
                # locked by a dead process, write our pid
                os.lseek(fd, 0, os.SEEK_SET)
                os.ftruncate(fd, 0)
                os.write(fd, str(pid).encode('utf-8'))
                return pid

return old_pid

finally:
            os.close(fd)

def _unlock_thread(self):
        self.count -= 1
        self.thread_lock.release()

def __enter__(self):
        dnf.util.ensure_dir(os.path.dirname(self.target))
        self._lock_thread()
        prev_pid = -1
        my_pid = os.getpid()
        pid = self._try_lock(my_pid)
        while pid != my_pid:
            if pid != -1:
                if not self.blocking:
                    self._unlock_thread()
                    msg = '%s already locked by %d' % (self.description, pid)
                    raise ProcessLockError(msg, pid)
                if prev_pid != pid:
                    msg = _('Waiting for process with pid %d to finish.') % (pid)
                    logger.info(msg)
                    prev_pid = pid
            time.sleep(1)
            pid = self._try_lock(my_pid)

def __exit__(self, *exc_args):
        if self.count == 1:
            os.unlink(self.target)
        self._unlock_thread()

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Editing: lock.py

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