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#!/usr/bin/python
# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@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 subprocess
import sys
import cloudinit
import cloudinit.util as util
import time
import logging
import errno
def warn(str):
sys.stderr.write(str)
def main():
cmds = ( "start", "start-local" )
cmd = ""
if len(sys.argv) > 1:
cmd = sys.argv[1]
if not cmd in cmds:
sys.stderr.write("bad command %s. use one of %s\n" % (cmd, cmds))
sys.exit(1)
now = time.strftime("%a, %d %b %Y %H:%M:%S %z")
try:
uptimef=open("/proc/uptime")
uptime=uptimef.read().split(" ")[0]
uptimef.close()
except IOError as e:
warn("unable to open /proc/uptime\n")
uptime = "na"
msg = "cloud-init %s running: %s. up %s seconds" % (cmd, now, uptime)
sys.stderr.write(msg + "\n")
sys.stderr.flush()
source_type = "all"
if cmd == "start-local":
source_type = "local"
cloudinit.logging_set_from_cfg_file()
log = logging.getLogger()
log.info(msg)
# cache is not instance specific, so it has to be purged
# but we want 'start' to benefit from a cache if
# a previous start-local populated one
if cmd == "start-local":
cloudinit.purge_cache()
cloud = cloudinit.CloudInit(source_type=source_type)
try:
cloud.get_data_source()
except cloudinit.DataSourceNotFoundException as e:
sys.stderr.write("no instance data found in %s\n" % cmd)
sys.exit(1)
# store the metadata
cloud.update_cache()
msg = "found data source: %s" % cloud.datasource
sys.stderr.write(msg + "\n")
log.debug(msg)
# parse the user data (ec2-run-userdata.py)
try:
cloud.sem_and_run("consume_userdata", "once-per-instance",
cloud.consume_userdata,[],False)
except:
warn("consuming user data failed!\n")
raise
try:
if util.get_cfg_option_bool(cloud.cfg,"preserve_hostname",False):
log.debug("preserve_hostname is set. not managing hostname")
else:
hostname = cloud.get_hostname()
cloud.sem_and_run("set_hostname", "once-per-instance",
set_hostname, [ hostname, log ], False)
cloud.sem_and_run("update_hostname", "always",
update_hostname, [ hostname, log ], False)
except:
warn("failed to set hostname\n")
#print "user data is:" + cloud.get_user_data()
# set the defaults (like what ec2-set-defaults.py did)
try:
cloud.sem_and_run("set_defaults", "once-per-instance",
set_defaults,[ cloud ],False)
except:
warn("failed to set defaults\n")
# finish, send the cloud-config event
cloud.initctl_emit()
sys.exit(0)
# read hostname from a 'hostname' file
# allow for comments and stripping line endings.
# if file doesn't exist, or no contents, return default
def read_hostname(filename, default=None):
try:
fp = open(filename,"r")
lines = fp.readlines()
fp.close()
for line in lines:
hpos = line.find("#")
if hpos != -1:
line = line[0:hpos]
line = line.rstrip()
if line:
return line
except IOError, e:
if e.errno == errno.ENOENT: pass
return default
def set_hostname(hostname, log):
try:
subprocess.Popen(['hostname', hostname]).communicate()
util.write_file("/etc/hostname","%s\n" % hostname, 0644)
log.debug("populated /etc/hostname with %s on first boot", hostname)
except:
log.error("failed to set_hostname")
def update_hostname(hostname, log):
prev_file="%s/%s" % (cloudinit.datadir,"previous-hostname")
etc_file = "/etc/hostname"
hostname_prev = None
hostname_in_etc = None
try:
hostname_prev = read_hostname(prev_file)
except:
log.warn("Failed to open %s" % prev_file)
try:
hostname_in_etc = read_hostname(etc_file)
except:
log.warn("Failed to open %s" % etc_file)
update_files = []
if not hostname_prev or hostname_prev != hostname:
update_files.append(prev_file)
if (not hostname_in_etc or
(hostname_in_etc == hostname_prev and hostname_in_etc != hostname)):
update_files.append(etc_file)
try:
for fname in update_files:
util.write_file(fname,"%s\n" % hostname, 0644)
log.debug("wrote %s to %s" % (hostname,fname))
except:
log.warn("failed to write hostname to %s" % fname)
if hostname_in_etc and hostname_prev and hostname_in_etc != hostname_prev:
log.debug("%s differs from %s. assuming user maintained" %
(prev_file,etc_file))
if etc_file in update_files:
log.debug("setting hostname to %s" % hostname)
subprocess.Popen(['hostname', hostname]).communicate()
if __name__ == '__main__':
main()
|
