formats.py

   1 if __name__ == '__main__':
   2         import findrox; findrox.version(1, 99, 11)
   3 import os, sys
   4 from support import shell_escape, Tmp
   5 import rox
   6 from rox.processes import PipeThroughCommand
   7
   8 current_command = None
   9
  10 def pipe_through_command(command, src, dst):
  11         global current_command
  12         assert not current_command
  13         try:
  14                 src.seek(0)
  15         except:
  16                 pass
  17         current_command = PipeThroughCommand(command, src, dst)
  18         try:
  19                 current_command.wait()
  20         finally:
  21                 current_command = None
  22
  23 operations = []
  24 class Operation:
  25         add_extension = False
  26
  27         def __init__(self, extension):
  28                 operations.append(self)
  29                 self.extension = extension
  30
  31         def can_handle(self, data):
  32                 return isinstance(data, FileData)
  33
  34         def save_to_stream(self, data, stream):
  35                 pipe_through_command(self.command, data.source, stream)
  36
  37 class Compress(Operation):
  38         "Compress a stream into another stream."
  39         add_extension = True
  40
  41         def __init__(self, extension, command, type):
  42                 Operation.__init__(self, extension)
  43                 self.command = command
  44                 self.type = type
  45
  46         def __str__(self):
  47                 return _('Compress as .%s') % self.extension
  48
  49 class Decompress(Operation):
  50         "Decompress a stream into another stream."
  51         type = 'text/plain'
  52
  53         def __init__(self, extension, command):
  54                 Operation.__init__(self, extension)
  55                 self.command = command
  56
  57         def __str__(self):
  58                 return _('Decompress .%s') % self.extension
  59
  60 class Extract(Operation):
  61         "Extract an archive to a directory."
  62         type = 'inode/directory'
  63
  64         def __init__(self, extension, command):
  65                 "If command has a %s then the source path is inserted, else uses stdin."
  66                 Operation.__init__(self, extension)
  67                 self.command = command
  68
  69         def __str__(self):
  70                 return _('Extract from a .%s') % self.extension
  71
  72         def save_to_stream(self, data, stream):
  73                 raise Exception(_('This operation creates a directory, so you have '
  74                                 'to drag to a filer window on the local machine'))
  75
  76         def save_to_file(self, data, path):
  77                 if os.path.exists(path):
  78                         if not os.path.isdir(path):
  79                                 raise Exception(_("'%s' already exists and is not a directory!") %
  80                                                 path)
  81                 if not os.path.exists(path):
  82                         os.mkdir(path)
  83                 os.chdir(path)
  84                 command = self.command
  85                 source = data.source
  86                 if command.find("'%s'") != -1:
  87                         command = command % shell_escape(source.name)
  88                         source = None
  89                 try:
  90                         pipe_through_command(command, source, None)
  91                 finally:
  92                         try:
  93                                 os.rmdir(path)  # Will only succeed if it's empty
  94                         except:
  95                                 pass
  96                         if os.path.exists(path):
  97                                 self.pull_up(path)
  98
  99         def pull_up(self, path):
 100                 # If we created only a single subdirectory, move it up.
 101                 dirs = os.listdir(path)
 102                 if len(dirs) != 1:
 103                         return
 104                 dir = dirs[0]
 105                 unneeded_path = os.path.join(path, dir)
 106                 if not os.path.isdir(unneeded_path):
 107                         return
 108                 import random
 109                 tmp_path = os.path.join(path, 'tmp-' + `random.randint(0, 100000)`)
 110                 os.rename(unneeded_path, tmp_path)
 111                 for file in os.listdir(tmp_path):
 112                         os.rename(os.path.join(tmp_path, file), os.path.join(path, file))
 113                 os.rmdir(tmp_path)
 114
 115 class Archive(Operation):
 116         "Create an archive from a directory."
 117         add_extension = True
 118
 119         def __init__(self, extension, command, type):
 120                 assert command.find("'%s'") != -1
 121
 122                 Operation.__init__(self, extension)
 123                 self.command = command
 124                 self.type = type
 125
 126         def __str__(self):
 127                 return _('Create .%s archive') % self.extension
 128
 129         def can_handle(self, data):
 130                 return isinstance(data, DirData)
 131
 132         def save_to_stream(self, data, stream):
 133                 os.chdir(os.path.dirname(data.path))
 134                 command = self.command % shell_escape(os.path.basename(data.path))
 135                 pipe_through_command(command, None, stream)
 136
 137 tgz = Extract('tgz',    "gunzip -c - | tar xf -")
 138 tbz = Extract('tar.bz2', "bunzip2 -c - | tar xf -")
 139 tarz = Extract('tar.Z', "uncompress -c - | tar xf -")
 140 rar = Extract('rar',    "rar x '%s'")
 141 ace = Extract('ace',   "unace x '%s'")
 142 tar = Extract('tar',    "tar xf -")
 143 rpm = Extract('rpm',    "rpm2cpio - | cpio -id --quiet")
 144 cpio = Extract('cpio',  "cpio -id --quiet")
 145 deb = Extract('deb', "ar x '%s'")
 146 zip = Extract('zip', "unzip -q '%s'")
 147 jar = Extract('jar', "unzip -q '%s'")
 148
 149 make_tgz = Archive('tgz', "tar cf - '%s' | gzip", 'application/x-compressed-tar')
 150 Archive('tar.gz',  "tar cf - '%s' | gzip", 'application/x-compressed-tar')
 151 Archive('tar.bz2', "tar cf - '%s' | bzip2", 'application/x-bzip-compressed-tar')
 152 Archive('zip',     "zip -qr - '%s'", 'application/zip'),
 153 Archive('jar',     "zip -qr - '%s'", 'application/x-jar')
 154 Archive('tar',     "tar cf - '%s'", 'application/x-tar')
 155
 156 # Note: these go afterwards so that .tar.gz matches before .gz
 157 make_gz = Compress('gz', "gzip -c -", 'application/x-gzip')
 158 Compress('bz2', "bzip2 -c -", 'application/x-bzip')
 159 Compress('uue', "uuencode /dev/stdout", 'application/x-uuencoded')
 160
 161 gz = Decompress('gz',   "gunzip -c -")
 162 bz2 = Decompress('bz2',  "bunzip2 -ck -")
 163 uue = Decompress('uue',  "uudecode -o /dev/stdout")
 164 z   = Decompress('Z',   "uncompress -c -")
 165
 166
 167 # Can bzip2 read bzip files?
 168
 169 aliases = {
 170         'tar.gz': 'tgz',
 171         'tar.bz': 'tar.bz2',
 172         'tbz': 'tar.bz2',
 173         'bz': 'bz2'
 174 }
 175
 176 known_extensions = {}
 177 for x in operations:
 178         try:
 179                 known_extensions[x.extension] = None
 180         except AttributeError:
 181                 pass
 182
 183 class FileData:
 184         "A file on the local filesystem."
 185         mode = None
 186         def __init__(self, path):
 187                 self.path = path
 188
 189                 if path == '-':
 190                         source = sys.stdin
 191                 else:
 192                         try:
 193                                 source = file(path)
 194                                 self.mode = os.stat(path).st_mode
 195                         except:
 196                                 rox.report_exception()
 197                                 sys.exit(1)
 198
 199                 self.path = path
 200                 start = source.read(300)
 201                 try:
 202                         if source is sys.stdin:
 203                                 raise Exception("Always copy stdin!")
 204                         source.seek(0)
 205                         self.source = source
 206                 except:
 207                         # Input is not a regular, local, seekable file, so copy it
 208                         # to a local temp file.
 209                         import shutil
 210                         tmp = Tmp()
 211                         tmp.write(start)
 212                         tmp.flush()
 213                         shutil.copyfileobj(source, tmp)
 214                         tmp.seek(0)
 215                         tmp.flush()
 216                         self.source = tmp
 217                 self.default = self.guess_format(start)
 218
 219                 if path == '-':
 220                         name = 'Data'
 221                 else:
 222                         name = path
 223                         for ext in known_extensions:
 224                                 if path.endswith('.' + ext):
 225                                         new = path[:-len(ext)-1]
 226                                         if len(new) < len(name):
 227                                                 name = new
 228                 if self.default.add_extension:
 229                         name += '.' + self.default.extension
 230
 231                 if name == path:
 232                         # Default name is same as input. Change it somehow...
 233                         if '.' in os.path.basename(name):
 234                                 name = name[:name.rindex('.')]
 235                         else:
 236                                 name += '.unpacked'
 237
 238                 self.default_name = name
 239
 240         def guess_format(self, data):
 241                 "Return a good default Operation, judging by the first 300 bytes or so."
 242                 l = len(data)
 243                 def string(offset, match):
 244                         return data[offset:offset + len(match)] == match
 245                 def short(offset, match):
 246                         if l > offset + 1:
 247                                 a = data[offset]
 248                                 b = data[offset + 1]
 249                                 return ((a == match & 0xff) and (b == (match >> 8))) or \
 250                                         (b == match & 0xff) and (a == (match >> 8))
 251                         return 0
 252
 253                 # Archives
 254                 if string(257, 'ustar\0') or string(257, 'ustar\040\040\0'):
 255                         return tar
 256                 if short(0, 070707) or short(0, 0143561) or string(0, '070707') or \
 257                    string(0, '070701') or string(0, '070702'):
 258                         return cpio
 259                 if string(0, '!<arch>') or string(0, '\\<ar>') or string(0, '<ar>'):
 260                         if string(7, '\ndebian'):
 261                                 return deb
 262                 if string(0, 'Rar!'): return rar
 263                 if string(7, '**ACE**'): return ace
 264                 if string(0, 'PK\003\004'): return zip
 265                 if string(0, 'PK00'): return zip
 266                 if string(0, '\xed\xab\xee\xdb'): return rpm
 267
 268                 # Compressed streams
 269                 if string(0, '\037\213'):
 270                         if self.path.endswith('.tar.gz') or self.path.endswith('.tgz'):
 271                                 return tgz
 272                         return gz
 273                 if string(0, 'BZh') or string(0, 'BZ'):
 274                         if self.path.endswith('.tar.bz') or self.path.endswith('.tar.bz2') or \
 275                            self.path.endswith('.tbz') or self.path.endswith('.tbz2'):
 276                                 return tbz
 277                         return bz2
 278                 if string(0, 'begin '):
 279                         return uue
 280                 if string(0, '\037\235'):
 281                         if self.path.endswith('.tar.Z'):
 282                             return tarz
 283                         return z
 284
 285                 return make_gz
 286
 287 class DirData:
 288         mode = None
 289         def __init__(self, path):
 290                 self.path = path
 291                 self.default = make_tgz
 292                 self.default_name = path + '.' + self.default.extension