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# vi: ts=4 expandtab
#
# Copyright (C) 2011 Canonical Ltd.
#
# Author: Ben Howard <ben.howard@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty 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, see <http://www.gnu.org/licenses/>.
import cloudinit.util as util
import cloudinit.SshUtil as sshutil
import re
import os
from cloudinit.CloudConfig import per_always
frequency = per_always
default_file = "/etc/apt/apt.conf.d/90cloud-init-tweaks"
def handle(_name, cfg, cloud, log, _args):
apt_pipelining_enabled = util.get_cfg_option_str(cfg, "apt-pipelining", False)
if apt_pipelining_enabled in ("False", "false", False):
write_apt_snippet(0, log)
elif apt_pipelining_enabled in ("Default", "default", "True", "true", True):
revert_os_default(log)
else:
write_apt_snippet(apt_pipelining_enabled, log)
def revert_os_default(log, f_name=default_file):
try:
if os.path.exists(f_name):
os.unlink(f_name)
except OSError:
log.debug("Unable to remove %s" % f_name)
def write_apt_snippet(setting, log, f_name=default_file):
"""
Reads f_name and determines if the setting matches or not. Sets to
desired value
"""
acquire_pipeline_depth = 'Acquire::http::Pipeline-Depth "%s";\n'
try:
if os.path.exists(f_name):
update_file = False
skip_re = re.compile('^//CLOUD-INIT-IGNORE.*')
enabled_re = re.compile('Acquire::http::Pipeline-Depth.*')
local_override = False
tweak = open(f_name, 'r')
new_file = []
for line in tweak.readlines():
if skip_re.match(line):
local_override = True
continue
if enabled_re.match(line):
try:
value = line.replace('"','')
value = value.replace(';','')
enabled = value.split()[1]
if enabled != setting:
update_file = True
line = acquire_pipeline_depth % setting
except IndexError:
log.debug("Unable to determine current setting of 'Acquire::http::Pipeline-Depth'\n%s" % e)
return
new_file.append(line)
tweak.close()
if local_override:
log.debug("Not updating apt pipelining settings due to local override in %s" % f_name)
return
if update_file:
tweak = open(f_name, 'w')
for line in new_file:
tweak.write(line)
tweak.close()
return
tweak = open(f_name, 'w')
tweak.write("""//Cloud-init Tweaks\n//Disables APT HTTP pipelining\n""")
tweak.write(acquire_pipeline_depth % setting)
tweak.close()
log.debug("Wrote %s with APT pipeline setting" % f_name )
except IOError as e:
log.debug("Unable to update pipeline settings in %s\n%s" % (f_name, e))
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