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import argparse
import curses
import getpass
import inspect
import logging
import os
import sys
import pkg_resources
import pytoml
# TODO: setup.py and obtain __version__ from rpm.spec
try:
__version__ = pkg_resources.get_distribution('pypodman').version
except Exception:
__version__ = '0.0.0'
class HelpFormatter(argparse.RawDescriptionHelpFormatter):
"""Set help width to screen size."""
def __init__(self, *args, **kwargs):
"""Construct HelpFormatter using screen width."""
if 'width' not in kwargs:
kwargs['width'] = 80
try:
height, width = curses.initscr().getmaxyx()
kwargs['width'] = width
finally:
curses.endwin()
super().__init__(*args, **kwargs)
class PodmanArgumentParser(argparse.ArgumentParser):
"""Default remote podman configuration."""
def __init__(self, **kwargs):
"""Construct the parser."""
kwargs['add_help'] = True
kwargs['allow_abbrev'] = True
kwargs['description'] = __doc__
kwargs['formatter_class'] = HelpFormatter
super().__init__(**kwargs)
def initialize_parser(self):
"""Initialize parser without causing recursion meltdown."""
self.add_argument(
'--version',
action='version',
version='%(prog)s v. ' + __version__)
self.add_argument(
'--log-level',
choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'],
default='WARNING',
type=str.upper,
help='set logging level for events. (default: %(default)s)',
)
self.add_argument(
'--run-dir',
metavar='DIRECTORY',
help=('directory to place local socket bindings.'
' (default: XDG_RUNTIME_DIR/pypodman'))
self.add_argument(
'--user',
default=getpass.getuser(),
help='Authenicating user on remote host. (default: %(default)s)')
self.add_argument(
'--host', help='name of remote host. (default: None)')
self.add_argument(
'--remote-socket-path',
metavar='PATH',
help=('path of podman socket on remote host'
' (default: /run/podman/io.projectatomic.podman)'))
self.add_argument(
'--identity-file',
metavar='PATH',
help=('path to ssh identity file. (default: ~user/.ssh/id_dsa)'))
self.add_argument(
'--config-home',
metavar='DIRECTORY',
help=('home of configuration "pypodman.conf".'
' (default: XDG_CONFIG_HOME/pypodman'))
actions_parser = self.add_subparsers(
dest='subparser_name', help='actions')
# pull in plugin(s) code for each subcommand
for name, obj in inspect.getmembers(
sys.modules['lib.actions'],
lambda member: inspect.isclass(member)):
if hasattr(obj, 'subparser'):
try:
obj.subparser(actions_parser)
except NameError as e:
logging.critical(e)
logging.warning(
'See subparser configuration for Class "{}"'.format(
name))
sys.exit(3)
def parse_args(self, args=None, namespace=None):
"""Parse command line arguments, backed by env var and config_file."""
self.initialize_parser()
cooked = super().parse_args(args, namespace)
return self.resolve_configuration(cooked)
def resolve_configuration(self, args):
"""Find and fill in any arguments not passed on command line."""
args.xdg_runtime_dir = os.environ.get('XDG_RUNTIME_DIR', '/tmp')
args.xdg_config_home = os.environ.get('XDG_CONFIG_HOME',
os.path.expanduser('~/.config'))
args.xdg_config_dirs = os.environ.get('XDG_CONFIG_DIRS', '/etc/xdg')
# Configuration file(s) are optional,
# required arguments may be provided elsewhere
config = {'default': {}}
dirs = args.xdg_config_dirs.split(':')
dirs.extend((args.xdg_config_home, args.config_home))
for dir_ in dirs:
if dir_ is None:
continue
try:
with open(os.path.join(dir_, 'pypodman/pypodman.conf'),
'r') as stream:
config.update(pytoml.load(stream))
except OSError:
pass
def reqattr(name, value):
if value:
setattr(args, name, value)
return value
self.error('Required argument "%s" is not configured.' % name)
reqattr(
'run_dir',
getattr(args, 'run_dir')
or os.environ.get('RUN_DIR')
or config['default'].get('run_dir')
or os.path.join(args.xdg_runtime_dir, 'pypodman')
) # yapf: disable
setattr(
args,
'host',
getattr(args, 'host')
or os.environ.get('HOST')
or config['default'].get('host')
) # yapf:disable
reqattr(
'user',
getattr(args, 'user')
or os.environ.get('USER')
or config['default'].get('user')
or getpass.getuser()
) # yapf:disable
reqattr(
'remote_socket_path',
getattr(args, 'remote_socket_path')
or os.environ.get('REMOTE_SOCKET_PATH')
or config['default'].get('remote_socket_path')
or '/run/podman/io.projectatomic.podman'
) # yapf:disable
reqattr(
'log_level',
getattr(args, 'log_level')
or os.environ.get('LOG_LEVEL')
or config['default'].get('log_level')
or logging.WARNING
) # yapf:disable
setattr(
args,
'identity_file',
getattr(args, 'identity_file')
or os.environ.get('IDENTITY_FILE')
or config['default'].get('identity_file')
or os.path.expanduser('~{}/.ssh/id_dsa'.format(args.user))
) # yapf:disable
if not os.path.isfile(args.identity_file):
args.identity_file = None
if args.host:
args.local_socket_path = os.path.join(args.run_dir,
"podman.socket")
else:
args.local_socket_path = args.remote_socket_path
args.local_uri = "unix:{}".format(args.local_socket_path)
args.remote_uri = "ssh://{}@{}{}".format(args.user, args.host,
args.remote_socket_path)
return args
def exit(self, status=0, message=None):
"""Capture message and route to logger."""
if message:
log = logging.info if status == 0 else logging.error
log(message)
super().exit(status)
def error(self, message):
"""Capture message and route to logger."""
logging.error('{}: {}'.format(self.prog, message))
logging.error("Try '{} --help' for more information.".format(
self.prog))
super().exit(2)
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