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# Copyright (C) 2004 Aaron Bentley
# <aaron.bentley@utoronto.ca>
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import sys
import os
import os.path
import pybaz as arch
import pybaz.util
import commands
__docformat__ = "restructuredtext"
__doc__ = "Support for aba-style external command scripts"
class AbaCmds:
"""
This class supports external aba-style subcommands in any programming
language.
"""
abadir = []
def __init__(self):
"""Determine the path to the aba commands"""
self.abadir=os.path.expanduser("~/.fai/aba")
if not os.access(self.abadir, os.X_OK):
self.abadir="/etc/fai/aba"
if not os.access(self.abadir, os.X_OK):
self.abadir=sys.path[0]+"/aba"
if not os.access(self.abadir, os.X_OK):
self.abadir=""
def list_commands(self):
"""
Display a list of short descriptions of available commands
"""
if (self.abadir == ""):
return
for command in self.get_commands():
if commands.suggestions.has_key(command.name) or \
commands.commands.has_key(command.name):
continue
command.command_exec(['desc'])
def get_commands(self):
"""
Return a sorted list of available aba commands.
:rtype: a list of `AbaCommand`
"""
extcommands = []
if self.abadir != "":
for k in os.listdir(self.abadir+"/commands"):
cmd = self.is_command(k)
if cmd:
extcommands.append(cmd)
extcommands.sort()
return extcommands
def is_command(self, command):
"""
Determine whether a given command is available.
:param command: The name of the command to look for
:type command: string
:rtype: `AbaCommand`
"""
if (self.abadir == ""):
return False
cmd = AbaCommand(command, self.abadir)
if cmd.exists():
return cmd
else:
return None
class AbaCommand:
"""
An external, aba-style command script
"""
def __init__(self, name, abadir):
self.name = name
self.path = abadir + "/commands/" + name
self.abadir = abadir
def __str__(self):
return self.name
def __lt__(self, arg):
return self.name < arg.name
def __gt__(self, arg):
return self.name > arg.name
def exists(self):
"""
Determines whether this command really exists.
Using commands that do not exist is frowned upon.
"""
return os.access(self.path, os.X_OK) and os.path.isfile(self.path)
def __call__(self, cmdline):
try:
self.run(cmdline.split())
except Exception, e:
print e
def command_exec(self, args, expected=0):
"""
Invoke a command.
:param args: The arguments to supply to the command
:type args: List of strings
:param expected: Return values to expect
:type expected: tuple of integers
:rtype: integer
"""
if (self.abadir == ""):
return
os.environ['abadir'] = self.abadir
os.environ['abaname'] = 'fai'
arch.util.exec_safe(self.path, args, stderr=sys.stderr,
stdout=sys.stdout, expected=expected)
def run(self, args):
"""
Run the command.
:param args: The arguments to pass to the command
:type args: list of strings
"""
exarg = ['exec']
exarg.extend(args)
self.command_exec(exarg, [0, 1, 2])
def help(self):
"""
Print command help to stdout.
"""
self.command_exec(['exec', '-H'])
# arch-tag: c4325683-03f6-4436-bf8a-04e59195f3c1
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