lib/bup/cmd/ftp.py

   1
   2 # For now, this completely relies on the assumption that the current
   3 # encoding (LC_CTYPE, etc.) is ASCII compatible, and that it returns
   4 # the exact same bytes from a decode/encode round-trip (or the reverse
   5 # (e.g. ISO-8859-1).
   6
   7 from __future__ import absolute_import, print_function
   8 import os, fnmatch, stat, sys
   9
  10 from bup import _helpers, options, git, shquote, ls, vfs
  11 from bup.compat import argv_bytes, fsdecode
  12 from bup.helpers import chunkyreader, handle_ctrl_c, log
  13 from bup.io import byte_stream, path_msg
  14 from bup.repo import LocalRepo
  15
  16
  17 repo = None
  18
  19 class OptionError(Exception):
  20     pass
  21
  22
  23 def do_ls(repo, args, out):
  24     try:
  25         opt = ls.opts_from_cmdline(args, onabort=OptionError)
  26     except OptionError as e:
  27         log('error: %s' % e)
  28         return
  29     return ls.within_repo(repo, opt, out)
  30
  31
  32 def write_to_file(inf, outf):
  33     for blob in chunkyreader(inf):
  34         outf.write(blob)
  35
  36
  37 def inputiter(f):
  38     if os.isatty(f.fileno()):
  39         while 1:
  40             if hasattr(_helpers, 'readline'):
  41                 try:
  42                     yield _helpers.readline(b'bup> ')
  43                 except EOFError:
  44                     print()  # Clear the line for the terminal's next prompt
  45                     break
  46             else:
  47                 out.write(b'bup> ')
  48                 out.flush()
  49                 read_line = f.readline()
  50                 if not read_line:
  51                     print('')
  52                     break
  53                 yield read_line
  54     else:
  55         for line in f:
  56             yield line
  57
  58
  59 def _completer_get_subs(repo, line):
  60     (qtype, lastword) = shquote.unfinished_word(line)
  61     dir, name = os.path.split(lastword)
  62     dir_path = vfs.resolve(repo, dir or b'/')
  63     _, dir_item = dir_path[-1]
  64     if not dir_item:
  65         subs = tuple()
  66     else:
  67         subs = tuple(dir_path + (entry,)
  68                      for entry in vfs.contents(repo, dir_item)
  69                      if (entry[0] != b'.' and entry[0].startswith(name)))
  70     return qtype, lastword, subs
  71
  72
  73 _attempt_start = None
  74 _attempt_end = None
  75 def attempt_completion(text, start, end):
  76     global _attempt_start, _attempt_end
  77     _attempt_start = start
  78     _attempt_end = end
  79     return None
  80
  81 _last_line = None
  82 _last_res = None
  83 def enter_completion(text, iteration):
  84     global repo
  85     global _attempt_end
  86     global _last_line
  87     global _last_res
  88     try:
  89         line = _helpers.get_line_buffer()[:_attempt_end]
  90         if _last_line != line:
  91             _last_res = _completer_get_subs(repo, line)
  92             _last_line = line
  93         qtype, lastword, subs = _last_res
  94         if iteration < len(subs):
  95             path = subs[iteration]
  96             leaf_name, leaf_item = path[-1]
  97             res = vfs.try_resolve(repo, leaf_name, parent=path[:-1])
  98             leaf_name, leaf_item = res[-1]
  99             fullname = os.path.join(*(name for name, item in res))
 100             if stat.S_ISDIR(vfs.item_mode(leaf_item)):
 101                 ret = shquote.what_to_add(qtype, lastword, fullname + b'/',
 102                                           terminate=False)
 103             else:
 104                 ret = shquote.what_to_add(qtype, lastword, fullname,
 105                                           terminate=True) + b' '
 106             return text + ret
 107     except Exception as e:
 108         log('\n')
 109         try:
 110             import traceback
 111             traceback.print_tb(sys.exc_traceback)
 112         except Exception as e2:
 113             log('Error printing traceback: %s\n' % e2)
 114         log('\nError in completion: %s\n' % e)
 115
 116
 117 optspec = """
 118 bup ftp [commands...]
 119 """
 120
 121 def main(argv):
 122     o = options.Options(optspec)
 123     opt, flags, extra = o.parse_bytes(argv[1:])
 124
 125     git.check_repo_or_die()
 126
 127     global repo
 128
 129     sys.stdout.flush()
 130     out = byte_stream(sys.stdout)
 131     stdin = byte_stream(sys.stdin)
 132     repo = LocalRepo()
 133     pwd = vfs.resolve(repo, b'/')
 134     rv = 0
 135
 136     if extra:
 137         lines = (argv_bytes(arg) for arg in extra)
 138     else:
 139         if hasattr(_helpers, 'readline'):
 140             _helpers.set_completer_word_break_characters(b' \t\n\r/')
 141             _helpers.set_attempted_completion_function(attempt_completion)
 142             _helpers.set_completion_entry_function(enter_completion)
 143             if sys.platform.startswith('darwin'):
 144                 # MacOS uses a slightly incompatible clone of libreadline
 145                 _helpers.parse_and_bind(b'bind ^I rl_complete')
 146             _helpers.parse_and_bind(b'tab: complete')
 147         lines = inputiter(stdin)
 148
 149     for line in lines:
 150         if not line.strip():
 151             continue
 152         words = [word for (wordstart,word) in shquote.quotesplit(line)]
 153         cmd = words[0].lower()
 154         #log('execute: %r %r\n' % (cmd, parm))
 155         try:
 156             if cmd == b'ls':
 157                 # FIXME: respect pwd (perhaps via ls accepting resolve path/parent)
 158                 do_ls(repo, words[1:], out)
 159                 out.flush()
 160             elif cmd == b'cd':
 161                 np = pwd
 162                 for parm in words[1:]:
 163                     res = vfs.resolve(repo, parm, parent=np)
 164                     _, leaf_item = res[-1]
 165                     if not leaf_item:
 166                         raise Exception('%s does not exist'
 167                                         % path_msg(b'/'.join(name for name, item
 168                                                              in res)))
 169                     if not stat.S_ISDIR(vfs.item_mode(leaf_item)):
 170                         raise Exception('%s is not a directory' % path_msg(parm))
 171                     np = res
 172                 pwd = np
 173             elif cmd == b'pwd':
 174                 if len(pwd) == 1:
 175                     out.write(b'/')
 176                 out.write(b'/'.join(name for name, item in pwd) + b'\n')
 177                 out.flush()
 178             elif cmd == b'cat':
 179                 for parm in words[1:]:
 180                     res = vfs.resolve(repo, parm, parent=pwd)
 181                     _, leaf_item = res[-1]
 182                     if not leaf_item:
 183                         raise Exception('%s does not exist' %
 184                                         path_msg(b'/'.join(name for name, item
 185                                                            in res)))
 186                     with vfs.fopen(repo, leaf_item) as srcfile:
 187                         write_to_file(srcfile, out)
 188                 out.flush()
 189             elif cmd == b'get':
 190                 if len(words) not in [2,3]:
 191                     rv = 1
 192                     raise Exception('Usage: get <filename> [localname]')
 193                 rname = words[1]
 194                 (dir,base) = os.path.split(rname)
 195                 lname = len(words) > 2 and words[2] or base
 196                 res = vfs.resolve(repo, rname, parent=pwd)
 197                 _, leaf_item = res[-1]
 198                 if not leaf_item:
 199                     raise Exception('%s does not exist' %
 200                                     path_msg(b'/'.join(name for name, item in res)))
 201                 with vfs.fopen(repo, leaf_item) as srcfile:
 202                     with open(lname, 'wb') as destfile:
 203                         log('Saving %s\n' % path_msg(lname))
 204                         write_to_file(srcfile, destfile)
 205             elif cmd == b'mget':
 206                 for parm in words[1:]:
 207                     dir, base = os.path.split(parm)
 208
 209                     res = vfs.resolve(repo, dir, parent=pwd)
 210                     _, dir_item = res[-1]
 211                     if not dir_item:
 212                         raise Exception('%s does not exist' % path_msg(dir))
 213                     for name, item in vfs.contents(repo, dir_item):
 214                         if name == b'.':
 215                             continue
 216                         if fnmatch.fnmatch(name, base):
 217                             if stat.S_ISLNK(vfs.item_mode(item)):
 218                                 deref = vfs.resolve(repo, name, parent=res)
 219                                 deref_name, deref_item = deref[-1]
 220                                 if not deref_item:
 221                                     raise Exception('%s does not exist' %
 222                                                     path_msg('/'.join(name for name, item
 223                                                                       in deref)))
 224                                 item = deref_item
 225                             with vfs.fopen(repo, item) as srcfile:
 226                                 with open(name, 'wb') as destfile:
 227                                     log('Saving %s\n' % path_msg(name))
 228                                     write_to_file(srcfile, destfile)
 229             elif cmd == b'help' or cmd == b'?':
 230                 out.write(b'Commands: ls cd pwd cat get mget help quit\n')
 231                 out.flush()
 232             elif cmd in (b'quit', b'exit', b'bye'):
 233                 break
 234             else:
 235                 rv = 1
 236                 raise Exception('no such command %r' % cmd)
 237         except Exception as e:
 238             rv = 1
 239             log('error: %s\n' % e)
 240             raise
 241
 242     sys.exit(rv)