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#!/usr/bin/env python
# Authors: Cedric Bosdonnat <cbosdonnat@suse.com>
#
# Copyright (C) 2017 SUSE, Inc.
#
# 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/>.
"""
Main executable file which process input arguments
and calls corresponding methods on appropriate object.
"""
import argparse
import gettext
import logging
import sys
import os
from textwrap import dedent
from subprocess import CalledProcessError, Popen, PIPE
try:
from urlparse import urlparse
except ImportError:
from urllib.parse import urlparse
from virtBootstrap import sources
gettext.bindtextdomain("virt-bootstrap", "/usr/share/locale")
gettext.textdomain("virt-bootstrap")
try:
gettext.install("virt-bootstrap",
localedir="/usr/share/locale",
codeset='utf-8')
except IOError:
try:
import __builtin__
# pylint: disable=undefined-variable
__builtin__.__dict__['_'] = unicode
except ImportError:
import builtin
builtin.__dict__['_'] = str
# pylint: disable=invalid-name
# Create logger
logger = logging.getLogger(__name__)
def get_source(args):
"""
Get object which match the source type
"""
url = urlparse(args.uri)
scheme = url.scheme
if scheme == "":
scheme = 'file'
try:
class_name = "%sSource" % scheme.capitalize()
clazz = getattr(sources, class_name)
return clazz(url, args)
except Exception:
raise Exception("Invalid image URI scheme: '%s'" % url.scheme)
def set_root_password(rootfs, password):
"""
Set password on the root user in rootfs
"""
users = 'root:%s' % password
args = ['chpasswd', '-R', rootfs]
chpasswd = Popen(args, stdin=PIPE)
chpasswd.communicate(input=users)
if chpasswd.returncode != 0:
raise CalledProcessError(chpasswd.returncode, cmd=args, output=None)
def bootstrap(args):
"""
Get source object and call unpack method
"""
source = get_source(args)
if not os.path.exists(args.dest):
os.makedirs(args.dest)
elif not os.path.isdir(args.dest): # Show error if not directory
logger.error("Destination path '%s' is not directory.", args.dest)
sys.exit(1)
elif not os.access(args.dest, os.W_OK): # Check write permissions
logger.error("No write permissions on destination path '%s'",
args.dest)
sys.exit(1)
source.unpack(args.dest)
if args.root_password is not None:
set_root_password(args.dest, args.root_password)
def set_logging_conf(loglevel=None):
"""
Set format and logging level
"""
# Get logger
module_logger = logging.getLogger('virtBootstrap')
# Create console handler
console_handler = logging.StreamHandler()
# Set logging format
log_format = ('%(levelname)-8s: %(message)s')
console_handler.setFormatter(logging.Formatter(log_format))
# Add the handlers to logger
module_logger.addHandler(console_handler)
# Set logging level
module_logger.setLevel(loglevel or logging.INFO)
def main():
parser = argparse.ArgumentParser(
description=_("Container bootstrapping tool"),
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog=dedent(_('''
Example supported URI formats:
----------------------------------------
docker://ubuntu:latest
docker://docker.io/fedora
docker://privateregistry:5000/image
file:///path/to/local/rootfs.tar.xz
----------------------------------------
''')))
parser.add_argument("uri",
help=_("URI of container image"))
parser.add_argument("dest",
help=_("Destination folder"
"where image files to be extracted"))
parser.add_argument("--not-secure", action='store_true',
help=_("Ignore HTTPS errors"))
parser.add_argument("-u", "--username", default=None,
help=_("Username for accessing the source registry"))
parser.add_argument("-p", "--password", default=None,
help=_("Password for accessing the source registry"))
parser.add_argument("--root-password", default=None,
help=_("Root password to set in the created rootfs"))
parser.add_argument("--no-cache", action="store_true",
help=_("Do not store downloaded Docker images"))
parser.add_argument("-f", "--format", default='dir',
choices=['dir', 'qcow2'],
help=_("Format to be used for the root filesystem"))
parser.add_argument("-d", "--debug", action="store_const", dest="loglevel",
const=logging.DEBUG, help=_("Show debug messages"))
parser.add_argument("-q", "--quiet", action="store_const", dest="loglevel",
const=logging.WARNING,
help=_("Suppresses messages notifying about"
"current state or actions of virt-bootstrap"))
# TODO add UID / GID mapping parameters
try:
args = parser.parse_args()
# Configure logging lovel/format
set_logging_conf(args.loglevel)
# do the job here!
bootstrap(args)
sys.exit(0)
except KeyboardInterrupt:
sys.exit(0)
except ValueError as err:
sys.stderr.write("%s: %s\n" % (sys.argv[0], err))
sys.stderr.flush()
sys.exit(1)
if __name__ == '__main__':
sys.exit(main())
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