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#!/usr/bin/python |
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# |
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|
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# Copyright (C) 2009 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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|
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|
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import imp |
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import optparse |
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import os |
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import sys |
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import re |
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from cStringIO import StringIO |
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|
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from ganeti import constants |
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from ganeti import cli |
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from ganeti import utils |
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|
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# _autoconf shouldn't be imported from anywhere except constants.py, but we're |
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# making an exception here because this script is only used at build time. |
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from ganeti import _autoconf |
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|
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|
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class ShellWriter: |
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"""Helper class to write scripts with indentation. |
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|
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""" |
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INDENT_STR = " " |
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|
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def __init__(self, fh): |
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self._fh = fh |
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self._indent = 0 |
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|
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def IncIndent(self): |
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"""Increase indentation level by 1. |
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|
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""" |
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self._indent += 1 |
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|
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def DecIndent(self): |
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"""Decrease indentation level by 1. |
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|
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""" |
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assert self._indent > 0 |
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self._indent -= 1 |
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|
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def Write(self, txt, *args): |
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"""Write line to output file. |
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|
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""" |
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self._fh.write(self._indent * self.INDENT_STR) |
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|
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if args: |
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self._fh.write(txt % args) |
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else: |
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self._fh.write(txt) |
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|
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self._fh.write("\n") |
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|
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|
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def WritePreamble(sw): |
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"""Writes the script preamble. |
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|
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Helper functions should be written here. |
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|
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""" |
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sw.Write("# This script is automatically generated at build time.") |
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sw.Write("# Do not modify manually.") |
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|
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sw.Write("_ganeti_nodes() {") |
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sw.IncIndent() |
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try: |
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node_list_path = os.path.join(constants.DATA_DIR, "ssconf_node_list") |
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sw.Write("cat %s", utils.ShellQuote(node_list_path)) |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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sw.Write("_ganeti_instances() {") |
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sw.IncIndent() |
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try: |
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instance_list_path = os.path.join(constants.DATA_DIR, |
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"ssconf_instance_list") |
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sw.Write("cat %s", utils.ShellQuote(instance_list_path)) |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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sw.Write("_ganeti_jobs() {") |
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sw.IncIndent() |
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try: |
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# FIXME: this is really going into the internals of the job queue |
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sw.Write("local jlist=$( cd %s && echo job-*; )", |
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utils.ShellQuote(constants.QUEUE_DIR)) |
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sw.Write("echo ${jlist//job-/}") |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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sw.Write("_ganeti_os() {") |
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sw.IncIndent() |
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try: |
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# FIXME: Make querying the master for all OSes cheap |
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for path in constants.OS_SEARCH_PATH: |
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sw.Write("( cd %s && echo *; )", utils.ShellQuote(path)) |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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# Params: <offset> <options with values> <options without values> |
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# Result variable: $first_arg_idx |
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sw.Write("_ganeti_find_first_arg() {") |
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sw.IncIndent() |
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try: |
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sw.Write("local w i") |
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|
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sw.Write("first_arg_idx=") |
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sw.Write("for (( i=$1; i < COMP_CWORD; ++i )); do") |
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sw.IncIndent() |
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try: |
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sw.Write("w=${COMP_WORDS[$i]}") |
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|
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# Skip option value |
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sw.Write("""if [[ -n "$2" && "$w" == @($2) ]]; then let ++i""") |
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|
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# Skip |
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sw.Write("""elif [[ -n "$3" && "$w" == @($3) ]]; then :""") |
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|
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# Ah, we found the first argument |
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sw.Write("else first_arg_idx=$i; break;") |
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sw.Write("fi") |
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finally: |
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sw.DecIndent() |
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sw.Write("done") |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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# Params: <list of options separated by space> |
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# Input variable: $first_arg_idx |
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# Result variables: $arg_idx, $choices |
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sw.Write("_ganeti_list_options() {") |
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sw.IncIndent() |
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try: |
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sw.Write("""if [[ -z "$first_arg_idx" ]]; then""") |
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sw.IncIndent() |
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try: |
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sw.Write("arg_idx=0") |
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# Show options only if the current word starts with a dash |
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sw.Write("""if [[ "$cur" == -* ]]; then""") |
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sw.IncIndent() |
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try: |
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sw.Write("choices=$1") |
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finally: |
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sw.DecIndent() |
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sw.Write("fi") |
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sw.Write("return") |
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finally: |
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sw.DecIndent() |
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sw.Write("fi") |
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|
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# Calculate position of current argument |
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sw.Write("arg_idx=$(( COMP_CWORD - first_arg_idx ))") |
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sw.Write("choices=") |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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|
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def WriteCompReply(sw, args): |
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sw.Write("""COMPREPLY=( $(compgen %s -- "$cur") )""", args) |
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sw.Write("return") |
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|
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|
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class CompletionWriter: |
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"""Command completion writer class. |
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|
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""" |
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def __init__(self, arg_offset, opts, args): |
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self.arg_offset = arg_offset |
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self.opts = opts |
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self.args = args |
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|
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for opt in opts: |
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opt.all_names = sorted(opt._short_opts + opt._long_opts) |
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|
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def _FindFirstArgument(self, sw): |
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ignore = [] |
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skip_one = [] |
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|
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for opt in self.opts: |
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if opt.takes_value(): |
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# Ignore value |
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for i in opt.all_names: |
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ignore.append("%s=*" % utils.ShellQuote(i)) |
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skip_one.append(utils.ShellQuote(i)) |
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else: |
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ignore.extend([utils.ShellQuote(i) for i in opt.all_names]) |
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|
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ignore = sorted(utils.UniqueSequence(ignore)) |
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skip_one = sorted(utils.UniqueSequence(skip_one)) |
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|
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if ignore or skip_one: |
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# Try to locate first argument |
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sw.Write("_ganeti_find_first_arg %s %s %s", |
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self.arg_offset + 1, |
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utils.ShellQuote("|".join(skip_one)), |
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utils.ShellQuote("|".join(ignore))) |
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else: |
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# When there are no options the first argument is always at position |
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# offset + 1 |
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sw.Write("first_arg_idx=%s", self.arg_offset + 1) |
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|
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def _CompleteOptionValues(self, sw): |
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# Group by values |
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# "values" -> [optname1, optname2, ...] |
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values = {} |
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|
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for opt in self.opts: |
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if not opt.takes_value(): |
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continue |
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|
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# Only static choices implemented so far (e.g. no node list) |
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suggest = getattr(opt, "completion_suggest", None) |
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|
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if not suggest: |
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suggest = opt.choices |
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|
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if suggest: |
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suggest_text = " ".join(sorted(suggest)) |
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else: |
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suggest_text = "" |
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|
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values.setdefault(suggest_text, []).extend(opt.all_names) |
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|
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# Don't write any code if there are no option values |
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if not values: |
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return |
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|
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sw.Write("if [[ $COMP_CWORD -gt %s ]]; then", self.arg_offset + 1) |
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sw.IncIndent() |
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try: |
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sw.Write("""case "$prev" in""") |
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for (choices, names) in values.iteritems(): |
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# TODO: Implement completion for --foo=bar form |
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sw.Write("%s)", "|".join([utils.ShellQuote(i) for i in names])) |
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sw.IncIndent() |
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try: |
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WriteCompReply(sw, "-W %s" % utils.ShellQuote(choices)) |
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finally: |
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sw.DecIndent() |
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sw.Write(";;") |
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sw.Write("""esac""") |
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finally: |
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sw.DecIndent() |
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sw.Write("""fi""") |
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|
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def _CompleteArguments(self, sw): |
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if not (self.opts or self.args): |
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return |
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|
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all_option_names = [] |
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for opt in self.opts: |
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all_option_names.extend(opt.all_names) |
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all_option_names.sort() |
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|
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# List options if no argument has been specified yet |
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sw.Write("_ganeti_list_options %s", |
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utils.ShellQuote(" ".join(all_option_names))) |
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|
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if self.args: |
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last_idx = len(self.args) - 1 |
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last_arg_end = 0 |
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varlen_arg_idx = None |
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wrote_arg = False |
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|
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# Write some debug comments |
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for idx, arg in enumerate(self.args): |
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sw.Write("# %s: %r", idx, arg) |
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|
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sw.Write("compgenargs=") |
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|
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for idx, arg in enumerate(self.args): |
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assert arg.min is not None and arg.min >= 0 |
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assert not (idx < last_idx and arg.max is None) |
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|
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if arg.min != arg.max or arg.max is None: |
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if varlen_arg_idx is not None: |
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raise Exception("Only one argument can have a variable length") |
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varlen_arg_idx = idx |
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|
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compgenargs = [] |
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|
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if isinstance(arg, cli.ArgUnknown): |
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choices = "" |
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elif isinstance(arg, cli.ArgSuggest): |
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choices = utils.ShellQuote(" ".join(arg.choices)) |
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elif isinstance(arg, cli.ArgInstance): |
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choices = "$(_ganeti_instances)" |
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elif isinstance(arg, cli.ArgNode): |
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choices = "$(_ganeti_nodes)" |
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elif isinstance(arg, cli.ArgJobId): |
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choices = "$(_ganeti_jobs)" |
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elif isinstance(arg, cli.ArgFile): |
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choices = "" |
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compgenargs.append("-f") |
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elif isinstance(arg, cli.ArgCommand): |
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choices = "" |
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compgenargs.append("-c") |
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elif isinstance(arg, cli.ArgHost): |
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choices = "" |
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compgenargs.append("-A hostname") |
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else: |
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raise Exception("Unknown argument type %r" % arg) |
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|
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if arg.min == 1 and arg.max == 1: |
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cmpcode = """"$arg_idx" == %d""" % (last_arg_end) |
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elif arg.min == arg.max: |
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cmpcode = (""""$arg_idx" -ge %d && "$arg_idx" -lt %d""" % |
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(last_arg_end, last_arg_end + arg.max)) |
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elif arg.max is None: |
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cmpcode = """"$arg_idx" -ge %d""" % (last_arg_end) |
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else: |
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raise Exception("Unable to generate argument position condition") |
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|
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last_arg_end += arg.min |
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|
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if choices or compgenargs: |
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if wrote_arg: |
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condcmd = "elif" |
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else: |
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condcmd = "if" |
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|
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sw.Write("""%s [[ %s ]]; then""", condcmd, cmpcode) |
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sw.IncIndent() |
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try: |
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if choices: |
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sw.Write("""choices="$choices "%s""", choices) |
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if compgenargs: |
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sw.Write("compgenargs=%s", utils.ShellQuote(" ".join(compgenargs))) |
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finally: |
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sw.DecIndent() |
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|
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wrote_arg = True |
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|
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if wrote_arg: |
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sw.Write("fi") |
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|
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if self.args: |
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WriteCompReply(sw, """-W "$choices" $compgenargs""") |
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else: |
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# $compgenargs exists only if there are arguments |
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WriteCompReply(sw, '-W "$choices"') |
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|
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def WriteTo(self, sw): |
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self._FindFirstArgument(sw) |
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self._CompleteOptionValues(sw) |
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self._CompleteArguments(sw) |
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|
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|
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def WriteCompletion(sw, scriptname, funcname, |
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commands=None, |
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opts=None, args=None): |
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"""Writes the completion code for one command. |
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|
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@type sw: ShellWriter |
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@param sw: Script writer |
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@type scriptname: string |
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@param scriptname: Name of command line program |
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@type funcname: string |
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@param funcname: Shell function name |
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@type commands: list |
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@param commands: List of all subcommands in this program |
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|
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""" |
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sw.Write("%s() {", funcname) |
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sw.IncIndent() |
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try: |
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sw.Write('local cur="$2" prev="$3"') |
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sw.Write("local i first_arg_idx choices compgenargs arg_idx") |
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|
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sw.Write("COMPREPLY=()") |
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|
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if opts is not None and args is not None: |
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assert not commands |
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CompletionWriter(0, opts, args).WriteTo(sw) |
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|
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else: |
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sw.Write("""if [[ "$COMP_CWORD" == 1 ]]; then""") |
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sw.IncIndent() |
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try: |
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# Complete the command name |
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WriteCompReply(sw, |
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("-W %s" % |
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utils.ShellQuote(" ".join(sorted(commands.keys()))))) |
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finally: |
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sw.DecIndent() |
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sw.Write("fi") |
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|
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# We're doing options and arguments to commands |
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sw.Write("""case "${COMP_WORDS[1]}" in""") |
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for cmd, (_, argdef, optdef, _, _) in commands.iteritems(): |
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if not (argdef or optdef): |
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continue |
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|
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# TODO: Group by arguments and options |
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sw.Write("%s)", utils.ShellQuote(cmd)) |
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sw.IncIndent() |
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try: |
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CompletionWriter(1, optdef, argdef).WriteTo(sw) |
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finally: |
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sw.DecIndent() |
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|
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sw.Write(";;") |
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sw.Write("esac") |
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finally: |
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sw.DecIndent() |
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sw.Write("}") |
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|
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sw.Write("complete -F %s -o filenames %s", |
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utils.ShellQuote(funcname), |
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utils.ShellQuote(scriptname)) |
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|
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|
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def GetFunctionName(name): |
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return "_" + re.sub(r"[^a-z0-9]+", "_", name.lower()) |
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|
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|
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def LoadModule(filename): |
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"""Loads an external module by filename. |
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|
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""" |
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(name, ext) = os.path.splitext(filename) |
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|
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fh = open(filename, "U") |
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try: |
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return imp.load_module(name, fh, filename, (ext, "U", imp.PY_SOURCE)) |
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finally: |
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fh.close() |
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|
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|
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def GetCommands(filename, module): |
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"""Returns the commands defined in a module. |
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|
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Aliases are also added as commands. |
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|
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""" |
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try: |
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commands = getattr(module, "commands") |
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except AttributeError, err: |
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raise Exception("Script %s doesn't have 'commands' attribute" % |
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filename) |
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|
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# Use aliases |
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aliases = getattr(module, "aliases", {}) |
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if aliases: |
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commands = commands.copy() |
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for name, target in aliases.iteritems(): |
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commands[name] = commands[target] |
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|
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return commands |
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|
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|
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def main(): |
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buf = StringIO() |
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sw = ShellWriter(buf) |
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|
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WritePreamble(sw) |
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|
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# gnt-* scripts |
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for scriptname in _autoconf.GNT_SCRIPTS: |
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filename = "scripts/%s" % scriptname |
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|
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WriteCompletion(sw, scriptname, |
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GetFunctionName(scriptname), |
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commands=GetCommands(filename, LoadModule(filename))) |
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|
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# Burnin script |
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burnin = LoadModule("tools/burnin") |
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WriteCompletion(sw, "%s/burnin" % constants.TOOLSDIR, "_ganeti_burnin", |
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opts=burnin.OPTIONS, args=burnin.ARGUMENTS) |
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|
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print buf.getvalue() |
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|
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|
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if __name__ == "__main__": |
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main() |