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# 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 yaml
import os
import errno
import subprocess
from Cheetah.Template import Template
import cloudinit
import urllib2
import logging
import traceback
WARN = logging.WARN
DEBUG = logging.DEBUG
INFO = logging.INFO
def read_conf(fname):
try:
stream = open(fname,"r")
conf = yaml.load(stream)
stream.close()
return conf
except IOError as e:
if e.errno == errno.ENOENT:
return { }
raise
def get_base_cfg(cfgfile,cfg_builtin=""):
syscfg = read_conf(cfgfile)
if cfg_builtin:
builtin = yaml.load(cfg_builtin)
else:
return(syscfg)
return(mergedict(syscfg,builtin))
def get_cfg_option_bool(yobj, key, default=False):
if not yobj.has_key(key): return default
val = yobj[key]
if val is True: return True
if str(val).lower() in [ 'true', '1', 'on', 'yes']:
return True
return False
def get_cfg_option_str(yobj, key, default=None):
if not yobj.has_key(key): return default
return yobj[key]
def get_cfg_option_list_or_str(yobj, key, default=None):
if not yobj.has_key(key): return default
if isinstance(yobj[key],list): return yobj[key]
return([yobj[key]])
# merge values from src into cand.
# if src has a key, cand will not override
def mergedict(src,cand):
if isinstance(src,dict) and isinstance(cand,dict):
for k,v in cand.iteritems():
if k not in src:
src[k] = v
else:
src[k] = mergedict(src[k],v)
return src
def write_file(file,content,mode=0644,omode="wb"):
try:
os.makedirs(os.path.dirname(file))
except OSError as e:
if e.errno != errno.EEXIST:
raise e
f=open(file,omode)
if mode != None:
os.chmod(file,mode)
f.write(content)
f.close()
# get keyid from keyserver
def getkeybyid(keyid,keyserver):
shcmd="""
k=${1} ks=${2};
exec 2>/dev/null
[ -n "$k" ] || exit 1;
armour=$(gpg --list-keys --armour "${k}")
if [ -z "${armour}" ]; then
gpg --keyserver ${ks} --recv $k >/dev/null &&
armour=$(gpg --export --armour "${k}") &&
gpg --batch --yes --delete-keys "${k}"
fi
[ -n "${armour}" ] && echo "${armour}"
"""
args=['sh', '-c', shcmd, "export-gpg-keyid", keyid, keyserver]
return(subp(args)[0])
def subp(args, input=None):
s_in = None
if input is not None:
s_in = subprocess.PIPE
sp = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=s_in)
out,err = sp.communicate(input)
if sp.returncode is not 0:
raise subprocess.CalledProcessError(sp.returncode,args)
return(out,err)
def render_to_file(template, outfile, searchList):
t = Template(file='/etc/cloud/templates/%s.tmpl' % template, searchList=[searchList])
f = open(outfile, 'w')
f.write(t.respond())
f.close()
# read_optional_seed
# returns boolean indicating success or failure (presense of files)
# if files are present, populates 'fill' dictionary with 'user-data' and
# 'meta-data' entries
def read_optional_seed(fill,base="",ext="", timeout=2):
try:
(md,ud) = read_seeded(base,ext,timeout)
fill['user-data']= ud
fill['meta-data']= md
return True
except OSError, e:
if e.errno == errno.ENOENT:
return False
raise
# raise OSError with enoent if not found
def read_seeded(base="", ext="", timeout=2):
if base.startswith("/"):
base="file://%s" % base
if base.find("%s") >= 0:
ud_url = base % ("user-data" + ext)
md_url = base % ("meta-data" + ext)
else:
ud_url = "%s%s%s" % (base, "user-data", ext)
md_url = "%s%s%s" % (base, "meta-data", ext)
try:
md_resp = urllib2.urlopen(urllib2.Request(md_url), timeout=timeout)
ud_resp = urllib2.urlopen(urllib2.Request(ud_url), timeout=timeout)
md_str = md_resp.read()
ud = ud_resp.read()
md = yaml.load(md_str)
return(md,ud)
except urllib2.HTTPError:
raise
except urllib2.URLError, e:
if isinstance(e.reason,OSError) and e.reason.errno == errno.ENOENT:
raise e.reason
raise e
def logexc(log,lvl=logging.DEBUG):
log.log(lvl,traceback.format_exc())
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