This file is indexed.

/etc/bacula/scripts/dvd-handler is in bacula-sd 7.0.5+dfsg-4build1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
#!/usr/bin/python
#
# Check the free space available on a writable DVD
# Should always exit with 0 status, otherwise it indicates a serious error.
# (wrong number of arguments, Python exception...)
#
#  called:  dvd-handler <dvd-device-name> operation args
#
#  operations used by Bacula:
#
#   free  (no arguments)
#	      Scan the device and report the available space. It returns:
#	      Prints on the first output line the free space available in bytes.
#	      If an error occurs, prints a negative number (-errno), followed,
#	      on the second line, by an error message.
#
#   write  op filename
#	       Write a part file to disk.
#	       This operation needs two additional arguments.
#	       The first (op) indicates to
#		   0 -- append
#		   1 -- first write to a blank disk
#		   2 -- blank or truncate a disk
#
#		The second is the filename to write
#
#   operations available but not used by Bacula:
#
#   test      Scan the device and report the information found.
#	       This operation needs no further arguments.
#   prepare   Prepare a DVD+/-RW for being used by Bacula.
#	       Note: This is only useful if you already have some
#	       non-Bacula data on a medium, and you want to use
#	       it with Bacula. Don't run this on blank media, it
#	       is useless.
#
# 
# $Id$
#

import popen2
import os
import os.path
import errno
import sys
import re
import signal
import time
import array

class disk:
# Configurable values:
   
   dvdrwmediainfo = "dvd+rw-mediainfo"
   growcmd = "growisofs"
   dvdrwformat = "dvd+rw-format"
   dd = "/bin/dd"
   margin = 10485760 # 10 mb security margin

   # Comment the following line if you want the tray to be reloaded
   # when writing ends.
   growcmd += " -use-the-force-luke=notray"

# end of configurable values

###############################################################################
#
# This class represents DVD disk informations.
# When instantiated, it needs a device name.
# Status information about the device and the disk loaded is collected only when
# asked for (for example dvd-freespace doesn't need to know the media type, and
# dvd-writepart doesn't not always need to know the free space).
#
# The following methods are implemented:
# __init__	 we need that...
# __repr__	 this seems to be a good idea to have.
#		 Quite minimalistic implementation, though.
# __str__	 For casts to string. Return the current disk information
# is_empty	 Returns TRUE if the disk is empty, blank... this needs more
#		 work, especially concerning non-RW media and blank vs. no
#		 filesystem considerations. Here, we should also look for
#		 other filesystems - probably we don't want to silently
#		 overwrite UDF or ext2 or anything not mentioned in fstab...
#		 (NB: I don't think it is a problem)
# free		 Returns the available free space.
# write 	 Writes one part file to disk, either starting a new file
#		 system on disk, or appending to it.
#		 This method should also prepare a blank disk so that a
#		 certain part of the disk is used to allow detection of a
#		 used disk by all / more disk drives.
# prepare 	 Blank the device
#
###############################################################################
   def __init__(self, devicename):
      self.device = devicename
      self.disktype = "none"
      self.diskmode = "none"
      self.diskstatus = "none"
      self.hardwaredevice = "none"
      self.pid = 0
      self.next_session = -1
      self.capacity = -1

      self.freespace_collected = 0
      self.mediumtype_collected = 0

      self.growcmd += " -quiet"

      if self.is4gbsupported():
	 self.growcmd += " -use-the-force-luke=4gms"

      self.growparams = " -A 'Bacula Data' -input-charset=default -iso-level 3 -pad " + \
			"-p 'dvd-handler / growisofs' -sysid 'BACULADATA' -R"

      return

   def __repr__(self):
      return "disk(" + self.device + ") # This is an instance of class disk"

   def __str__(self):
      if not self.freespace_collected:
	 self.collect_freespace();
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      
      self.me  = "Class disk, initialized with device '" + self.device + "'\n"
      self.me += "type = '" + self.disktype + "' mode='" + self.diskmode + "' status = '" + self.diskstatus + "'\n"
      self.me += " next_session = " + str(self.next_session) + " capacity = " + str(self.capacity) + "\n"
      self.me += "Hardware device is '" + self.hardwaredevice + "'\n"
      self.me += "growcmd = '" + self.growcmd + "'\ngrowparams = '" + self.growparams + "'\n"
      return self.me

   ## Check if we want to allow growisofs to cross the 4gb boundary
   def is4gbsupported(self):
      processi = popen2.Popen4("uname -s -r")
      status = processi.wait()
      if not os.WIFEXITED(status):
	 return 1
      if os.WEXITSTATUS(status) != 0:
	 return 1
      strres = processi.fromchild.readline()[0:-1]
      version = re.search(r"Linux (\d+)\.(\d+)\.(\d+)", strres)
      if not version: # Non-Linux: allow
	 return 1
      
      if (int(version.group(1)) > 2) or (int(version.group(2)) > 6) or ((int(version.group(1)) == 2) and (int(version.group(2)) == 6) and (int(version.group(3)) >= 8)):
	 return 1
      else:
	 return 0

   def collect_freespace(self): # Collects current free space
      self.cmd = self.growcmd + " -F " + self.device
      processi = popen2.Popen4(self.cmd)
      status = processi.wait()
      if not os.WIFEXITED(status):
	 raise DVDError(0, "growisofs process did not exit correctly.")
      result = processi.fromchild.read()
      if os.WEXITSTATUS(status) != 0:
	 if (os.WEXITSTATUS(status) & 0x7F) == errno.ENOSPC:
	    # Kludge to force dvd-handler to return a free space of 0
	    self.next_session = 1
	    self.capacity = 1
	    self.freespace_collected = 1
	    return
	 else:
	    raise DVDError(os.WEXITSTATUS(status), "growisofs returned with an error " + result + ". Please check your are using a patched version of dvd+rw-tools.")
      next_sess = re.search(r"\snext_session=(\d+)\s", result, re.MULTILINE)
      capa = re.search(r"\scapacity=(\d+)\s", result, re.MULTILINE)
   
      if next_sess and capa:
	 self.next_session = long(next_sess.group(1))
	 self.capacity = long(capa.group(1))
	 
	 # testing cheat (emulate 4GB boundary at 100MB)
	 #if self.next_session > 100000000:
	 #   self.capacity = self.next_session
      else:
	 raise DVDError(0, "Cannot get next_session and capacity from growisofs.\nReturned: " + result)
      
      self.freespace_collected = 1
      return
   
   def collect_mediumtype(self): # Collects current medium type
      self.lasterror = ""
      cmd = self.dvdrwmediainfo + " " + self.device
      processi = popen2.Popen4(cmd)
      status = processi.wait()
      if not os.WIFEXITED(status):
	 raise DVDError(0, self.dvdrwmediainfo + " process did not exit correctly.")
      if os.WEXITSTATUS(status) != 0:
	 raise DVDError(0, "Cannot get media info from " + self.dvdrwmediainfo)
	 return
      result = processi.fromchild.read()
      
      hardware = re.search(r"INQUIRY:\s+(.*)\n", result, re.MULTILINE)
      mediatype = re.search(r"\sMounted Media:\s+([0-9A-F]{2})h, (\S*)\s", result, re.MULTILINE)
      mediamode = re.search(r"\sMounted Media:\s+[0-9A-F]{2}h, \S* (.*)\n", result, re.MULTILINE)
      status = re.search(r"\sDisc status:\s+(.*)\n", result, re.MULTILINE)
      
      if hardware:
	 self.hardwaredevice = hardware.group(1)
      
      if mediatype:
	 self.disktype = mediatype.group(2)
      else:
	 raise DVDError(0, "Media type not found in " + self.dvdrwmediainfo + " output")
      
      if self.disktype == "DVD-RW":
	 if mediamode:
	    self.diskmode = mediamode.group(1)
	 else:
	    raise DVDError(0, "Media mode not found for DVD-RW in " + self.dvdrwmediainfo + " output")
      
      if status:
	 self.diskstatus = status.group(1)
      else:
	 raise DVDError(0, "Disc status not found in " + self.dvdrwmediainfo + " output")

      
      self.mediumtype_collected = 1
      return

   def is_empty(self):
      if not self.freespace_collected:
	 self.collect_freespace();
      
      return 0 == self.next_session

   def is_RW(self):
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      return "DVD-RW" == self.disktype or "DVD+RW" == self.disktype or "DVD-RAM" == self.disktype

   def is_plus_RW(self):
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      return "DVD+RW" == self.disktype

   def is_minus_RW(self):
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      return "DVD-RW" == self.disktype
      
   def is_restricted_overwrite(self):
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      return self.diskmode == "Restricted Overwrite"

   def is_blank(self):
      if not self.mediumtype_collected:
	 self.collect_mediumtype();
      
      return self.diskstatus == "blank"

   def free(self):
      if not self.freespace_collected:
	 self.collect_freespace();
      
      fr = self.capacity-self.next_session-self.margin
      if fr < 0:
	 return 0
      else:
	 return fr

   def term_handler(self, signum, frame):
      print 'dvd-handler: Signal term_handler called with signal', signum
      if self.pid != 0:
	 print "dvd-handler: Sending SIGTERM to pid", self.pid
	 os.kill(self.pid, signal.SIGTERM)
	 time.sleep(10)
	 print "dvd-handler: Sending SIGKILL to pid", self.pid
	 os.kill(self.pid, signal.SIGKILL)
	 sys.exit(1)

   def write(self, newvol, partfile):
      # Blank DVD+RW when there is no data on it
      if newvol and self.is_plus_RW() and self.is_blank():
	 print "DVD+RW looks brand-new, blank it to fix some DVD-writers bugs."
	 self.blank()
	 print "Done, now writing the part file."
      
      if newvol and self.is_minus_RW() and (not self.is_restricted_overwrite()):
	 print "DVD-RW is in " + self.diskmode + " mode, reformating it to Restricted Overwrite"
	 self.reformat_minus_RW()
	 print "Done, now writing the part file."
      
      cmd = self.growcmd + self.growparams
      if newvol:
	 # Ignore any existing iso9660 filesystem - used for truncate
	 if newvol == 2:
	     cmd += " -use-the-force-luke=tty"
	 cmd += " -Z "
      else:
	 cmd += " -M "
      cmd += self.device + " " + str(partfile)
      print "Running " + cmd
      oldsig = signal.signal(signal.SIGTERM, self.term_handler)
      proc = popen2.Popen4(cmd)
      self.pid = proc.pid
      status = proc.poll()
      while status == -1:
	 line = proc.fromchild.readline()
	 while len(line) > 0:
	    print line,
	    line = proc.fromchild.readline()
	 time.sleep(1)
	 status = proc.poll()
      self.pid = 0
      print
      signal.signal(signal.SIGTERM, oldsig)
      if not os.WIFEXITED(status):
	 raise DVDError(0, cmd + " process did not exit correctly, signal/status " + str(status))
      if os.WEXITSTATUS(status) != 0:
	 raise DVDError(os.WEXITSTATUS(status), cmd + " exited with status " + str(os.WEXITSTATUS(status)) + ", signal/status " + str(status))

   def prepare(self):
      if not self.is_RW():
	 raise DVDError(0, "I won't prepare a non-rewritable medium")
      
      # Blank DVD+RW when there is no data on it
      if self.is_plus_RW() and self.is_blank():
	 print "DVD+RW looks brand-new, blank it to fix some DVD-writers bugs."
	 self.blank()
	 return # It has been completely blanked: Medium is ready to be used by Bacula
      
      if self.is_minus_RW() and (not self.is_restricted_overwrite()):
	 print "DVD-RW is in " + self.diskmode + " mode, reformating it to Restricted Overwrite"
	 self.reformat_minus_RW()
	 return # Reformated: Medium is ready to be used by Bacula
      
      # TODO: Check if /dev/fd/0 and /dev/zero exists, otherwise, run self.blank()
      if not os.path.exists("/dev/fd/0") or not os.path.exists("/dev/zero"):
	 print "/dev/fd/0 or /dev/zero doesn't exist, blank the medium completely."
	 self.blank()
	 return
      
      cmd = self.dd + " if=/dev/zero bs=1024 count=512 | " + self.growcmd + " -Z " + self.device + "=/dev/fd/0"
      print "Running " + cmd
      oldsig = signal.signal(signal.SIGTERM, self.term_handler)
      proc = popen2.Popen4(cmd)
      self.pid = proc.pid
      status = proc.poll() 
      while status == -1:
	 line = proc.fromchild.readline()
	 while len(line) > 0:
	    print line,
	    line = proc.fromchild.readline()
	 time.sleep(1)
	 status = proc.poll()
      self.pid = 0
      print
      signal.signal(signal.SIGTERM, oldsig)
      if os.WEXITSTATUS(status) != 0:
	 raise DVDError(os.WEXITSTATUS(status), cmd + " exited with status " + str(os.WEXITSTATUS(status)) + ", signal/status " + str(status))

   def blank(self):
      cmd = self.growcmd + " -Z " + self.device + "=/dev/zero"
      print "Running " + cmd
      oldsig = signal.signal(signal.SIGTERM, self.term_handler)
      proc = popen2.Popen4(cmd)
      self.pid = proc.pid
      status = proc.poll()
      while status == -1:
	 line = proc.fromchild.readline()
	 while len(line) > 0:
	    print line,
	    line = proc.fromchild.readline()
	 time.sleep(1)
	 status = proc.poll()
      self.pid = 0
      print
      signal.signal(signal.SIGTERM, oldsig)
      if os.WEXITSTATUS(status) != 0:
	 raise DVDError(os.WEXITSTATUS(status), cmd + " exited with status " + str(os.WEXITSTATUS(status)) + ", signal/status " + str(status))

   def reformat_minus_RW(self):
      cmd = self.dvdrwformat + " -force " + self.device
      print "Running " + cmd
      oldsig = signal.signal(signal.SIGTERM, self.term_handler)
      proc = popen2.Popen4(cmd)
      self.pid = proc.pid
      status = proc.poll()
      while status == -1:
	 line = proc.fromchild.readline()
	 while len(line) > 0:
	    print line,
	    line = proc.fromchild.readline()
	 time.sleep(1)
	 status = proc.poll()
      self.pid = 0
      print
      signal.signal(signal.SIGTERM, oldsig)
      if os.WEXITSTATUS(status) != 0:
	 raise DVDError(os.WEXITSTATUS(status), cmd + " exited with status " + str(os.WEXITSTATUS(status)) + ", signal/status " + str(status))

# class disk ends here.

class DVDError(Exception):
   def __init__(self, errno, value):
      self.errno = errno
      self.value = value
      if self.value[-1] == '\n':
	 self.value = self.value[0:-1]
   def __str__(self):
      return str(self.value) + " || errno = " + str(self.errno) + " (" + os.strerror(self.errno & 0x7F) + ")"

def usage():
   print "Wrong number of arguments."
   print """
Usage:

dvd-handler DEVICE test
dvd-handler DEVICE free
dvd-handler DEVICE write APPEND FILE
dvd-handler DEVICE prepare

where DEVICE is a device name like /dev/sr0 or /dev/dvd.

Operations:
test	  Scan the device and report the information found.
	   This operation needs no further arguments.
free	  Scan the device and report the available space.
write	  Write a part file to disk.
	   This operation needs two additional arguments.
	   The first indicates to append (0), restart the
	   disk (1) or restart existing disk (2). The second
	   is the file to write.
prepare   Prepare a DVD+/-RW for being used by Bacula.
	   Note: This is only useful if you already have some
	   non-Bacula data on a medium, and you want to use
	   it with Bacula. Don't run this on blank media, it
	   is useless.
"""
   sys.exit(1)

if len(sys.argv) < 3:
   usage()

dvd = disk(sys.argv[1])

if "free" == sys.argv[2]:
   if len(sys.argv) == 3:
      try:
	 free = dvd.free()
      except DVDError, e:
	 if e.errno != 0:
	    print -e.errno
	 else:
	    print errno.EPIPE
	 print str(e)
      else:
	 print free
	 print "No Error reported."
   else:
      print "Wrong number of arguments for free operation. Wanted 3 got", len(sys.argv)
      usage()
elif "prepare" == sys.argv[2]:
   if len(sys.argv) == 3:
      try:
	 dvd.prepare()
      except DVDError, e:
	 print "Error while preparing medium: ", str(e)
	 if e.errno != 0:
	    sys.exit(e.errno & 0x7F)
	 else:
	    sys.exit(errno.EPIPE)
      else:
	 print "Medium prepared successfully."
   else:
      print "Wrong number of arguments for prepare operation. Wanted 3 got", len(sys.argv)
      usage()
elif "test" == sys.argv[2]:
   try:
      print str(dvd)
      print "Blank disk: " + str(dvd.is_blank()) + " ReWritable disk: " + str(dvd.is_RW())
      print "Free space: " + str(dvd.free())
   except DVDError, e:
      print "Error while getting informations: ", str(e)
elif "write" == sys.argv[2]:
   if len(sys.argv) == 5:
      try:
	 dvd.write(long(sys.argv[3]), sys.argv[4])
      except DVDError, e:
	 print "Error while writing part file: ", str(e)
	 if e.errno != 0:
	    sys.exit(e.errno & 0x7F)
	 else:
	    sys.exit(errno.EPIPE)
      else:
	 print "Part file " + sys.argv[4] + " successfully written to disk."
   else:
      print "Wrong number of arguments for write operation. Wanted 5 got", len(sys.argv)
      usage()
      sys.exit(1)
else:
   print "No operation - use test, free, prepare or write."
   print "THIS MIGHT BE A CASE OF DEBUGGING BACULA OR AN ERROR!"
sys.exit(0)