root / lib / cli.py @ 9ff7e35c
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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module dealing with command line parsing"""
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import sys |
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import textwrap |
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import os.path |
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import copy |
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from ganeti import utils |
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from ganeti import logger |
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from ganeti import errors |
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from ganeti import mcpu |
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from ganeti import constants |
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from optparse import (OptionParser, make_option, TitledHelpFormatter, |
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Option, OptionValueError, SUPPRESS_HELP) |
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__all__ = ["DEBUG_OPT", "NOHDR_OPT", "SEP_OPT", "GenericMain", "SubmitOpCode", |
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"cli_option", "GenerateTable", "AskUser", |
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"ARGS_NONE", "ARGS_FIXED", "ARGS_ATLEAST", "ARGS_ANY", "ARGS_ONE", |
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"USEUNITS_OPT", "FIELDS_OPT", "FORCE_OPT"] |
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DEBUG_OPT = make_option("-d", "--debug", default=False, |
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action="store_true",
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help="Turn debugging on")
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NOHDR_OPT = make_option("--no-headers", default=False, |
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action="store_true", dest="no_headers", |
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help="Don't display column headers")
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SEP_OPT = make_option("--separator", default=None, |
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action="store", dest="separator", |
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help="Separator between output fields"
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" (defaults to one space)")
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USEUNITS_OPT = make_option("--human-readable", default=False, |
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action="store_true", dest="human_readable", |
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help="Print sizes in human readable format")
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FIELDS_OPT = make_option("-o", "--output", dest="output", action="store", |
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type="string", help="Select output fields", |
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metavar="FIELDS")
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FORCE_OPT = make_option("-f", "--force", dest="force", action="store_true", |
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default=False, help="Force the operation") |
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_LOCK_OPT = make_option("--lock-retries", default=None, |
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type="int", help=SUPPRESS_HELP)
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def ARGS_FIXED(val): |
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"""Macro-like function denoting a fixed number of arguments"""
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return -val
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def ARGS_ATLEAST(val): |
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"""Macro-like function denoting a minimum number of arguments"""
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return val
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ARGS_NONE = None
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ARGS_ONE = ARGS_FIXED(1)
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ARGS_ANY = ARGS_ATLEAST(0)
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def check_unit(option, opt, value): |
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try:
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return utils.ParseUnit(value)
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except errors.UnitParseError, err:
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raise OptionValueError("option %s: %s" % (opt, err)) |
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class CliOption(Option): |
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TYPES = Option.TYPES + ("unit",)
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TYPE_CHECKER = copy.copy(Option.TYPE_CHECKER) |
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TYPE_CHECKER["unit"] = check_unit
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# optparse.py sets make_option, so we do it for our own option class, too
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cli_option = CliOption |
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def _ParseArgs(argv, commands): |
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"""Parses the command line and return the function which must be
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executed together with its arguments
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Arguments:
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argv: the command line
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commands: dictionary with special contents, see the design doc for
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cmdline handling
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"""
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if len(argv) == 0: |
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binary = "<command>"
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else:
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binary = argv[0].split("/")[-1] |
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if len(argv) > 1 and argv[1] == "--version": |
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print "%s (ganeti) %s" % (binary, constants.RELEASE_VERSION) |
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# Quit right away. That way we don't have to care about this special
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# argument. optparse.py does it the same.
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sys.exit(0)
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if len(argv) < 2 or argv[1] not in commands.keys(): |
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# let's do a nice thing
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sortedcmds = commands.keys() |
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sortedcmds.sort() |
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print ("Usage: %(bin)s {command} [options...] [argument...]" |
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"\n%(bin)s <command> --help to see details, or"
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" man %(bin)s\n" % {"bin": binary}) |
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# compute the max line length for cmd + usage
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mlen = max([len(" %s %s" % (cmd, commands[cmd][3])) for cmd in commands]) |
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mlen = min(60, mlen) # should not get here... |
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# and format a nice command list
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print "Commands:" |
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for cmd in sortedcmds: |
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cmdstr = " %s %s" % (cmd, commands[cmd][3]) |
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help_text = commands[cmd][4]
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help_lines = textwrap.wrap(help_text, 79-3-mlen) |
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print "%-*s - %s" % (mlen, cmdstr, |
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help_lines.pop(0))
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for line in help_lines: |
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print "%-*s %s" % (mlen, "", line) |
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print
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return None, None, None |
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cmd = argv.pop(1)
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func, nargs, parser_opts, usage, description = commands[cmd] |
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parser_opts.append(_LOCK_OPT) |
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parser = OptionParser(option_list=parser_opts, |
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description=description, |
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formatter=TitledHelpFormatter(), |
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usage="%%prog %s %s" % (cmd, usage))
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parser.disable_interspersed_args() |
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options, args = parser.parse_args() |
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if nargs is None: |
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if len(args) != 0: |
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print >> sys.stderr, ("Error: Command %s expects no arguments" % cmd) |
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return None, None, None |
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elif nargs < 0 and len(args) != -nargs: |
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print >> sys.stderr, ("Error: Command %s expects %d argument(s)" % |
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(cmd, -nargs)) |
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return None, None, None |
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elif nargs >= 0 and len(args) < nargs: |
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print >> sys.stderr, ("Error: Command %s expects at least %d argument(s)" % |
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(cmd, nargs)) |
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return None, None, None |
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return func, options, args
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def AskUser(text, choices=None): |
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"""Ask the user a question.
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Args:
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text - the question to ask.
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choices - list with elements tuples (input_char, return_value,
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description); if not given, it will default to: [('y', True,
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'Perform the operation'), ('n', False, 'Do no do the operation')];
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note that the '?' char is reserved for help
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Returns: one of the return values from the choices list; if input is
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not possible (i.e. not running with a tty, we return the last entry
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from the list
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"""
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if choices is None: |
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choices = [('y', True, 'Perform the operation'), |
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('n', False, 'Do not perform the operation')] |
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if not choices or not isinstance(choices, list): |
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raise errors.ProgrammerError("Invalid choiches argument to AskUser") |
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for entry in choices: |
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if not isinstance(entry, tuple) or len(entry) < 3 or entry[0] == '?': |
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raise errors.ProgrammerError("Invalid choiches element to AskUser") |
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answer = choices[-1][1] |
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new_text = [] |
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for line in text.splitlines(): |
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new_text.append(textwrap.fill(line, 70, replace_whitespace=False)) |
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text = "\n".join(new_text)
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try:
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f = file("/dev/tty", "r+") |
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except IOError: |
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return answer
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try:
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chars = [entry[0] for entry in choices] |
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chars[-1] = "[%s]" % chars[-1] |
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chars.append('?')
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maps = dict([(entry[0], entry[1]) for entry in choices]) |
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while True: |
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f.write(text) |
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f.write('\n')
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f.write("/".join(chars))
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f.write(": ")
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line = f.readline(2).strip().lower()
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if line in maps: |
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answer = maps[line] |
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break
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elif line == '?': |
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for entry in choices: |
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f.write(" %s - %s\n" % (entry[0], entry[2])) |
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f.write("\n")
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continue
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finally:
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f.close() |
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return answer
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def SubmitOpCode(op): |
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"""Function to submit an opcode.
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This is just a simple wrapper over the construction of the processor
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instance. It should be extended to better handle feedback and
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interaction functions.
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"""
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proc = mcpu.Processor() |
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return proc.ExecOpCode(op, logger.ToStdout)
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def GenericMain(commands): |
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"""Generic main function for all the gnt-* commands.
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Argument: a dictionary with a special structure, see the design doc
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for command line handling.
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"""
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# save the program name and the entire command line for later logging
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if sys.argv:
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binary = os.path.basename(sys.argv[0]) or sys.argv[0] |
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if len(sys.argv) >= 2: |
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binary += " " + sys.argv[1] |
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old_cmdline = " ".join(sys.argv[2:]) |
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else:
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old_cmdline = ""
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else:
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binary = "<unknown program>"
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old_cmdline = ""
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func, options, args = _ParseArgs(sys.argv, commands) |
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if func is None: # parse error |
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return 1 |
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logger.SetupLogging(debug=options.debug, program=binary) |
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try:
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utils.Lock('cmd', max_retries=options.lock_retries, debug=options.debug)
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except errors.LockError, err:
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logger.ToStderr(str(err))
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return 1 |
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if old_cmdline:
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logger.Info("run with arguments '%s'" % old_cmdline)
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else:
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logger.Info("run with no arguments")
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try:
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try:
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result = func(options, args) |
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except errors.ConfigurationError, err:
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logger.Error("Corrupt configuration file: %s" % err)
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logger.ToStderr("Aborting.")
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result = 2
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except errors.HooksAbort, err:
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logger.ToStderr("Failure: hooks execution failed:")
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for node, script, out in err.args[0]: |
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if out:
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logger.ToStderr(" node: %s, script: %s, output: %s" %
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(node, script, out)) |
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else:
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logger.ToStderr(" node: %s, script: %s (no output)" %
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(node, script)) |
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result = 1
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except errors.HooksFailure, err:
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logger.ToStderr("Failure: hooks general failure: %s" % str(err)) |
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result = 1
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except errors.ResolverError, err:
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this_host = utils.HostInfo.SysName() |
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if err.args[0] == this_host: |
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msg = "Failure: can't resolve my own hostname ('%s')"
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else:
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msg = "Failure: can't resolve hostname '%s'"
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logger.ToStderr(msg % err.args[0])
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result = 1
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except errors.OpPrereqError, err:
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logger.ToStderr("Failure: prerequisites not met for this"
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" operation:\n%s" % str(err)) |
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result = 1
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except errors.OpExecError, err:
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logger.ToStderr("Failure: command execution error:\n%s" % str(err)) |
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result = 1
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finally:
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utils.Unlock('cmd')
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utils.LockCleanup() |
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return result
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def GenerateTable(headers, fields, separator, data, |
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numfields=None, unitfields=None): |
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"""Prints a table with headers and different fields.
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Args:
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headers: Dict of header titles or None if no headers should be shown
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fields: List of fields to show
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separator: String used to separate fields or None for spaces
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data: Data to be printed
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numfields: List of fields to be aligned to right
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unitfields: List of fields to be formatted as units
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"""
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if numfields is None: |
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numfields = [] |
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if unitfields is None: |
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unitfields = [] |
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format_fields = [] |
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for field in fields: |
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if separator is not None: |
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format_fields.append("%s")
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elif field in numfields: |
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format_fields.append("%*s")
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else:
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format_fields.append("%-*s")
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if separator is None: |
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mlens = [0 for name in fields] |
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format = ' '.join(format_fields)
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else:
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format = separator.replace("%", "%%").join(format_fields) |
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for row in data: |
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for idx, val in enumerate(row): |
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if fields[idx] in unitfields: |
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try:
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val = int(val)
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except ValueError: |
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pass
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else:
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val = row[idx] = utils.FormatUnit(val) |
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if separator is None: |
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mlens[idx] = max(mlens[idx], len(val)) |
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result = [] |
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if headers:
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args = [] |
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for idx, name in enumerate(fields): |
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hdr = headers[name] |
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if separator is None: |
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mlens[idx] = max(mlens[idx], len(hdr)) |
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args.append(mlens[idx]) |
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args.append(hdr) |
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result.append(format % tuple(args))
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for line in data: |
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args = [] |
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for idx in xrange(len(fields)): |
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if separator is None: |
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args.append(mlens[idx]) |
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args.append(line[idx]) |
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result.append(format % tuple(args))
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return result
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