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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>
# Author: Chad Smith <chad.smith@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""Bootcmd: run arbitrary commands early in the boot process."""
import os
from textwrap import dedent
from cloudinit.config.schema import get_meta_doc, validate_cloudconfig_schema
from cloudinit.settings import PER_ALWAYS
from cloudinit import temp_utils
from cloudinit import subp
from cloudinit import util
frequency = PER_ALWAYS
# The schema definition for each cloud-config module is a strict contract for
# describing supported configuration parameters for each cloud-config section.
# It allows cloud-config to validate and alert users to invalid or ignored
# configuration options before actually attempting to deploy with said
# configuration.
distros = ['all']
meta = {
'id': 'cc_bootcmd',
'name': 'Bootcmd',
'title': 'Run arbitrary commands early in the boot process',
'description': dedent("""\
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.
.. note::
when writing files, do not use /tmp dir as it races with
systemd-tmpfiles-clean LP: #1707222. Use /run/somedir instead.
"""),
'distros': distros,
'examples': [dedent("""\
bootcmd:
- echo 192.168.1.130 us.archive.ubuntu.com > /etc/hosts
- [ cloud-init-per, once, mymkfs, mkfs, /dev/vdb ]
""")],
'frequency': PER_ALWAYS,
}
schema = {
'type': 'object',
'properties': {
'bootcmd': {
'type': 'array',
'items': {
'oneOf': [
{'type': 'array', 'items': {'type': 'string'}},
{'type': 'string'}]
},
'additionalItems': False, # Reject items of non-string non-list
'additionalProperties': False,
'minItems': 1,
}
}
}
__doc__ = get_meta_doc(meta, schema) # Supplement python help()
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
validate_cloudconfig_schema(cfg, schema)
with temp_utils.ExtendedTemporaryFile(suffix=".sh") as tmpf:
try:
content = util.shellify(cfg["bootcmd"])
tmpf.write(util.encode_text(content))
tmpf.flush()
except Exception as e:
util.logexc(log, "Failed to shellify bootcmd: %s", str(e))
raise
try:
env = os.environ.copy()
iid = cloud.get_instance_id()
if iid:
env['INSTANCE_ID'] = str(iid)
cmd = ['/bin/sh', tmpf.name]
subp.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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