gsh/file_transfer.py

   1 # This program is free software; you can redistribute it and/or modify
   2 # it under the terms of the GNU General Public License as published by
   3 # the Free Software Foundation; either version 2 of the License, or
   4 # (at your option) any later version.
   5 #
   6 # This program is distributed in the hope that it will be useful,
   7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 # GNU Library General Public License for more details.
  10 #
  11 # You should have received a copy of the GNU General Public License
  12 # along with this program; if not, write to the Free Software
  13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  14 #
  15 # See the COPYING file for license information.
  16 #
  17 # Copyright (c) 2007, 2008 Guillaume Chazarain <guichaz@gmail.com>
  18
  19 import base64
  20 import os
  21 import random
  22
  23 from gsh import callbacks
  24 from gsh import pity
  25 from gsh.console import console_output
  26 from gsh import remote_dispatcher
  27 from gsh import dispatchers
  28
  29 CMD_PREFIX = 'python -c "`echo "%s"|tr , \\\\\\n|openssl base64 -d`" '
  30
  31 CMD_SEND = CMD_PREFIX + 'send "%s" "%s" "%s"\n'
  32 CMD_FORWARD = CMD_PREFIX + 'forward "%s" "%s"\n'
  33 CMD_RECEIVE = CMD_PREFIX + 'receive "%s" "%s"\n'
  34
  35 def find_pity_dot_py():
  36     path = pity.__file__
  37     if not path.endswith('.py'):
  38         # Read from the .py source file
  39         dot_py_start = path.find('.py')
  40         if dot_py_start >= 0:
  41             path = path[:dot_py_start+3]
  42
  43     if not os.path.isabs(path):
  44         path = os.getcwd() + '/' + path
  45
  46     return path
  47
  48 # Save the full path, in case we change directory
  49 PITY_PATH = find_pity_dot_py()
  50
  51 def base64version():
  52     python_lines = []
  53     for line in file(PITY_PATH):
  54         hash_pos = line.find(chr(35))
  55         if hash_pos < 0:
  56             line = line[:hash_pos]
  57         line = line.rstrip()
  58         if line:
  59             python_lines.append(line)
  60     python_source = '\n'.join(python_lines)
  61     encoded = base64.encodestring(python_source).rstrip('\n').replace('\n', ',')
  62     return encoded
  63
  64 def file_transfer_cb(dispatcher, host_port):
  65     previous_shell = get_previous_shell(dispatcher)
  66     previous_shell.dispatch_write(pity.STDIN_PREFIX + host_port + '\n')
  67
  68 def get_infos():
  69     """Returns (first, last)"""
  70     first = None
  71     last = None
  72     for i in dispatchers.all_instances():
  73         if i.enabled:
  74             if not first:
  75                 first = i
  76             last = i
  77     return first, last
  78
  79 def get_previous_shell(shell):
  80     shells = [i for i in dispatchers.all_instances() if i.enabled]
  81     current_pos = shells.index(shell)
  82     while True:
  83         current_pos = (current_pos - 1) % len(shells)
  84         prev_shell = shells[current_pos]
  85         if prev_shell.enabled:
  86             return prev_shell
  87
  88 def replicate(shell, path):
  89     nr_peers = len([i for i in dispatchers.all_instances() if i.enabled])
  90     if nr_peers <= 1:
  91         console_output('No other remote shell to replicate files to\n')
  92         return
  93     receiver = get_previous_shell(shell)
  94     pity_py = base64version()
  95     for i in dispatchers.all_instances():
  96         if not i.enabled:
  97             continue
  98         cb = lambda host_port, i=i: file_transfer_cb(i, host_port)
  99         transfer1, transfer2 = callbacks.add('file transfer', cb, False)
 100         if i == shell:
 101             i.dispatch_command(CMD_SEND % (pity_py, path, transfer1, transfer2))
 102         elif i != receiver:
 103             i.dispatch_command(CMD_FORWARD % (pity_py, transfer1, transfer2))
 104         else:
 105             i.dispatch_command(CMD_RECEIVE % (pity_py, transfer1, transfer2))
 106         i.change_state(remote_dispatcher.STATE_RUNNING)
 107
 108 class local_uploader(remote_dispatcher.remote_dispatcher):
 109     def __init__(self, path_to_upload):
 110         remote_dispatcher.remote_dispatcher.__init__(self, '.')
 111         self.path_to_upload = path_to_upload
 112         self.upload_started = False
 113
 114     def launch_ssh(self, name):
 115         os.execl('/bin/sh', 'sh')
 116
 117     def change_state(self, state):
 118         remote_dispatcher.remote_dispatcher.change_state(self, state)
 119         if state != remote_dispatcher.STATE_IDLE:
 120             return
 121
 122         if not self.upload_started:
 123             replicate(self, self.path_to_upload)
 124             self.upload_started = True
 125         else:
 126             self.disconnect()
 127             self.close()
 128
 129 def upload(local_path):
 130     local_shell = local_uploader(local_path)
 131