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# Copyright (C) 2011 Canonical Ltd.
#
# Author: Ben Howard <ben.howard@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Apt Pipelining
--------------
**Summary:** configure apt pipelining
This module configures apt's ``Acquite::http::Pipeline-Depth`` option, whcih
controls how apt handles HTTP pipelining. It may be useful for pipelining to be
disabled, because some web servers, such as S3 do not pipeline properly (LP:
#948461). The ``apt_pipelining`` config key may be set to ``false`` to disable
pipelining altogether. This is the default behavior. If it is set to ``none``,
``unchanged``, or ``os``, no change will be made to apt configuration and the
default setting for the distro will be used. The pipeline depth can also be
manually specified by setting ``apt_pipelining`` to a number. However, this is
not recommended.
**Internal name:** ``cc_apt_pipelining``
**Module frequency:** per instance
**Supported distros:** ubuntu, debian
**Config keys**::
apt_pipelining: <false/none/unchanged/os/number>
"""
from cloudinit.settings import PER_INSTANCE
from cloudinit import util
frequency = PER_INSTANCE
distros = ['ubuntu', 'debian']
DEFAULT_FILE = "/etc/apt/apt.conf.d/90cloud-init-pipelining"
APT_PIPE_TPL = ("//Written by cloud-init per 'apt_pipelining'\n"
'Acquire::http::Pipeline-Depth "%s";\n')
# Acquire::http::Pipeline-Depth can be a value
# from 0 to 5 indicating how many outstanding requests APT should send.
# A value of zero MUST be specified if the remote host does not properly linger
# on TCP connections - otherwise data corruption will occur.
def handle(_name, cfg, _cloud, log, _args):
apt_pipe_value = util.get_cfg_option_str(cfg, "apt_pipelining", 'os')
apt_pipe_value_s = str(apt_pipe_value).lower().strip()
if apt_pipe_value_s == "false":
write_apt_snippet("0", log, DEFAULT_FILE)
elif apt_pipe_value_s in ("none", "unchanged", "os"):
return
elif apt_pipe_value_s in [str(b) for b in range(0, 6)]:
write_apt_snippet(apt_pipe_value_s, log, DEFAULT_FILE)
else:
log.warn("Invalid option for apt_pipelining: %s", apt_pipe_value)
def write_apt_snippet(setting, log, f_name):
"""Writes f_name with apt pipeline depth 'setting'."""
file_contents = APT_PIPE_TPL % (setting)
util.write_file(f_name, file_contents)
log.debug("Wrote %s with apt pipeline depth setting %s", f_name, setting)
# vi: ts=4 expandtab
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