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# Copyright (C) 2009-2011 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Bootcmd
-------
**Summary:** run commands early in boot process
This module runs arbitrary commands very early in the boot process,
only slightly after a boothook would run. This is very similar to a
boothook, but more user friendly. The environment variable ``INSTANCE_ID``
will be set to the current instance id for all run commands. Commands can be
specified either as lists or strings. For invocation details, see ``runcmd``.
.. note::
bootcmd should only be used for things that could not be done later in the
boot process.
**Internal name:** ``cc_bootcmd``
**Module frequency:** per always
**Supported distros:** all
**Config keys**::
bootcmd:
- echo 192.168.1.130 us.archive.ubuntu.com > /etc/hosts
- [ cloud-init-per, once, mymkfs, mkfs, /dev/vdb ]
"""
import os
from cloudinit.settings import PER_ALWAYS
from cloudinit import util
frequency = PER_ALWAYS
def handle(name, cfg, cloud, log, _args):
if "bootcmd" not in cfg:
log.debug(("Skipping module named %s,"
" no 'bootcmd' key in configuration"), name)
return
with util.ExtendedTemporaryFile(suffix=".sh") as tmpf:
try:
content = util.shellify(cfg["bootcmd"])
tmpf.write(util.encode_text(content))
tmpf.flush()
except Exception:
util.logexc(log, "Failed to shellify bootcmd")
raise
try:
env = os.environ.copy()
iid = cloud.get_instance_id()
if iid:
env['INSTANCE_ID'] = str(iid)
cmd = ['/bin/sh', tmpf.name]
util.subp(cmd, env=env, capture=False)
except Exception:
util.logexc(log, "Failed to run bootcmd module %s", name)
raise
# vi: ts=4 expandtab
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