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# clean.py
# Clean CLI command.
#
# Copyright (C) 2014-2016 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.cli import commands
from dnf.i18n import _, P_
from dnf.yum import misc
import dnf.cli
import dnf.exceptions
import dnf.lock
import dnf.logging
import dnf.repo
import logging
import os
import re
import time
logger = logging.getLogger("dnf")
# Dict mapping cmdline arguments to actual data types to be cleaned up
_CACHE_TYPES = {
'metadata': ['metadata', 'dbcache', 'expire-cache'],
'packages': ['packages'],
'dbcache': ['dbcache'],
'expire-cache': ['expire-cache'],
'all': ['metadata', 'packages', 'dbcache'],
}
def _tree(dirpath):
"""Traverse dirpath recursively and yield relative filenames."""
for root, dirs, files in os.walk(dirpath):
base = os.path.relpath(root, dirpath)
for f in files:
path = os.path.join(base, f)
yield os.path.normpath(path)
def _filter(files, patterns):
"""Yield those filenames that match any of the patterns."""
return (f for f in files for p in patterns if re.match(p, f))
def _clean(dirpath, files):
"""Remove the given filenames from dirpath."""
count = 0
for f in files:
path = os.path.join(dirpath, f)
logger.log(dnf.logging.DDEBUG, _('Removing file %s'), path)
misc.unlink_f(path)
count += 1
return count
def _cached_repos(files):
"""Return the repo IDs that have some cached metadata around."""
metapat = dnf.repo.CACHE_FILES['metadata']
matches = (re.match(metapat, f) for f in files)
return set(m.group('repoid') for m in matches if m)
class CleanCommand(commands.Command):
"""A class containing methods needed by the cli to execute the
clean command.
"""
aliases = ('clean',)
summary = _('remove cached data')
@staticmethod
def set_argparser(parser):
parser.add_argument('type', nargs='+',
choices=_CACHE_TYPES.keys(),
help=_('Metadata type to clean'))
def run(self):
cachedir = self.base.conf.cachedir
md_lock = dnf.lock.build_metadata_lock(cachedir, True)
download_lock = dnf.lock.build_download_lock(cachedir, True)
rpmdb_lock = dnf.lock.build_rpmdb_lock(self.base.conf.persistdir, True)
while True:
try:
with md_lock and download_lock and rpmdb_lock:
types = set(t for c in self.opts.type for t in _CACHE_TYPES[c])
files = list(_tree(cachedir))
logger.debug(_('Cleaning data: ' + ' '.join(types)))
if 'expire-cache' in types:
expired = _cached_repos(files)
self.base._repo_persistor.expired_to_add.update(expired)
types.remove('expire-cache')
logger.info(_('Cache was expired'))
patterns = [dnf.repo.CACHE_FILES[t] for t in types]
count = _clean(cachedir, _filter(files, patterns))
logger.info(P_('%d file removed', '%d files removed', count) % count)
return
except dnf.exceptions.LockError as e:
if not self.base.conf.exit_on_lock:
msg = _('Waiting for process with pid %d to finish.') % (e.pid)
logger.info(msg)
time.sleep(3)
else:
raise e