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/usr/lib/python2.7/dist-packages/psshlib/cli.py is in pssh 2.3.1-1.

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# Copyright (c) 2009-2012, Andrew McNabb
# Copyright (c) 2003-2008, Brent N. Chun

import optparse
import os
import shlex
import sys
import textwrap
import version

_DEFAULT_PARALLELISM = 32
_DEFAULT_TIMEOUT     = 0 # "infinity" by default


def common_parser():
    """
    Create a basic OptionParser with arguments common to all pssh programs.
    """
    # The "resolve" conflict handler avoids errors from the hosts option
    # conflicting with the help option.
    parser = optparse.OptionParser(conflict_handler='resolve',
            version=version.VERSION)
    # Ensure that options appearing after the command are sent to ssh.
    parser.disable_interspersed_args()
    parser.epilog = "Example: pssh -h nodes.txt -l irb2 -o /tmp/foo uptime"

    parser.add_option('-h', '--hosts', dest='host_files', action='append',
            metavar='HOST_FILE',
            help='hosts file (each line "[user@]host[:port]")')
    parser.add_option('-H', '--host', dest='host_strings', action='append',
            metavar='HOST_STRING',
            help='additional host entries ("[user@]host[:port]")')
    parser.add_option('-l', '--user', dest='user',
            help='username (OPTIONAL)')
    parser.add_option('-p', '--par', dest='par', type='int',
            help='max number of parallel threads (OPTIONAL)')
    parser.add_option('-o', '--outdir', dest='outdir',
            help='output directory for stdout files (OPTIONAL)')
    parser.add_option('-e', '--errdir', dest='errdir',
            help='output directory for stderr files (OPTIONAL)')
    parser.add_option('-t', '--timeout', dest='timeout', type='int',
            help='timeout (secs) (0 = no timeout) per host (OPTIONAL)')
    parser.add_option('-O', '--option', dest='options', action='append',
            metavar='OPTION', help='SSH option (OPTIONAL)')
    parser.add_option('-v', '--verbose', dest='verbose', action='store_true',
            help='turn on warning and diagnostic messages (OPTIONAL)')
    parser.add_option('-A', '--askpass', dest='askpass', action='store_true',
            help='Ask for a password (OPTIONAL)')
    parser.add_option('-x', '--extra-args', action='callback', type='string',
            metavar='ARGS', callback=shlex_append, dest='extra',
            help='Extra command-line arguments, with processing for '
            'spaces, quotes, and backslashes')
    parser.add_option('-X', '--extra-arg', dest='extra', action='append',
            metavar='ARG', help='Extra command-line argument')

    return parser


def common_defaults(**kwargs):
    defaults = dict(par=_DEFAULT_PARALLELISM, timeout=_DEFAULT_TIMEOUT)
    defaults.update(**kwargs)
    envvars = [('user', 'PSSH_USER'),
            ('par', 'PSSH_PAR'),
            ('outdir', 'PSSH_OUTDIR'),
            ('errdir', 'PSSH_ERRDIR'),
            ('timeout', 'PSSH_TIMEOUT'),
            ('verbose', 'PSSH_VERBOSE'),
            ('print_out', 'PSSH_PRINT'),
            ('askpass', 'PSSH_ASKPASS'),
            ('inline', 'PSSH_INLINE'),
            ('recursive', 'PSSH_RECURSIVE'),
            ('archive', 'PSSH_ARCHIVE'),
            ('compress', 'PSSH_COMPRESS'),
            ('localdir', 'PSSH_LOCALDIR'),
            ]
    for option, var, in envvars:
        value = os.getenv(var)
        if value:
            defaults[option] = value

    value = os.getenv('PSSH_OPTIONS')
    if value:
        defaults['options'] = [value]

    value = os.getenv('PSSH_HOSTS')
    if value:
        message1 = ('Warning: the PSSH_HOSTS environment variable is '
            'deprecated.  Please use the "-h" option instead, and consider '
            'creating aliases for convenience.  For example:')
        message2 = "    alias pssh_abc='pssh -h /path/to/hosts_abc'"
        sys.stderr.write(textwrap.fill(message1))
        sys.stderr.write('\n')
        sys.stderr.write(message2)
        sys.stderr.write('\n')
        defaults['host_files'] = [value]

    return defaults


def shlex_append(option, opt_str, value, parser):
    """An optparse callback similar to the append action.

    The given value is processed with shlex, and the resulting list is
    concatenated to the option's dest list.
    """
    lst = getattr(parser.values, option.dest)
    if lst is None:
        lst = []
        setattr(parser.values, option.dest, lst)
    lst.extend(shlex.split(value))