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#!/usr/bin/python
#
# create - generate Juju charm from template
#
# Copyright (C) 2011 Canonical Ltd.
# Author: Clint Byrum <clint.byrum@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 os
import sys
import os.path as path
import time
import shutil
import tempfile
import textwrap
import socket
import argparse
from Cheetah.Template import Template
from stat import ST_MODE
def portable_get_maintainer():
""" Portable best effort to determine a maintainer """
if 'NAME' in os.environ:
name = os.environ['NAME']
else:
try:
import pwd
name = pwd.getpwuid(os.getuid()).pw_gecos.split(',')[0].strip()
if not len(name):
name = pwd.getpwuid(os.getuid())[0]
except:
name = 'Your Name'
if not len(name):
name = 'Your Name'
email = os.environ.get('EMAIL', '%s@%s' % (name.replace(' ', '.'),
socket.getfqdn()))
return name, email
def setup_parser():
parser = argparse.ArgumentParser()
parser.add_argument('charmname', help='Name of charm to create.')
parser.add_argument('charmhome', nargs='?',
help='Dir to create charm in. Defaults to CHARM_HOME '
'env var or PWD')
return parser
def apt_fill(package):
v = {}
try:
import apt
c = apt.Cache()
c.open()
p = c[package]
print "Found " + package + " package in apt cache, as a result " \
+ "charm contents have been pre-populated based on package metadata."
v['summary'] = p.summary
v['description'] = textwrap.fill(p.description, width=72,
subsequent_indent=' ')
except:
print "Failed to find " + package + " in apt cache, creating " \
+ "an empty charm instead."
v['summary'] = '<Fill in summary here>'
v['description'] = '<Multi-line description here>'
return v
def main():
parser = setup_parser()
args = parser.parse_args()
try:
from ubuntutools.config import ubu_email as get_maintainer
except ImportError:
get_maintainer = portable_get_maintainer
if args.charmhome:
charm_home = args.charmhome
else:
charm_home = os.getenv('CHARM_HOME', '.')
home = path.abspath(path.dirname(__file__))
template_dir = path.join(home, 'templates')
output_dir = path.join(charm_home, args.charmname)
print "Generating template for " + args.charmname + " from templates in " \
+ template_dir
print "Charm will be stored in " + output_dir
if path.exists(output_dir):
print output_dir + " exists. Please move it out of the way."
sys.exit(1)
shutil.copytree(path.join(template_dir, 'charm'), output_dir)
v = {'package': args.charmname,
'maintainer': '%s <%s>' % get_maintainer()}
v.update(apt_fill(args.charmname))
for root, dirs, files in os.walk(output_dir):
for outfile in files:
full_outfile = path.join(root, outfile)
mode = os.stat(full_outfile)[ST_MODE]
try:
t = Template(file=full_outfile, searchList=(v))
o = tempfile.NamedTemporaryFile(dir=root, delete=False)
os.chmod(o.name, mode)
o.write(str(t))
o.close()
backupname = full_outfile + str(time.time())
os.rename(full_outfile, backupname)
try:
os.rename(o.name, full_outfile)
os.unlink(backupname)
except Exception, e:
print "WARNING: Could not enable templated file: " + str(e)
os.rename(backupname, full_outfile)
raise
except Exception, e:
print "WARNING: could not process template for " \
+ full_outfile + ": " + str(e)
raise
if __name__ == "__main__":
main()
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