def read_toc(device, fast_toc=False):
"""
Return cdrdao-generated table of contents for 'device'.
"""
# cdrdao MUST be passed a non-existing filename as its last argument
# to write the TOC to; it does not support writing to stdout or
# overwriting an existing file, nor does linux seem to support
# locking a non-existant file. Thus, this race-condition introducing
# hack is carried from morituri to whipper and will be removed when
# cdrdao is fixed.
fd, tocfile = tempfile.mkstemp(suffix=u'.cdrdao.read-toc.whipper')
os.close(fd)
os.unlink(tocfile)
cmd = [CDRDAO, 'read-toc'] + (['--fast-toc'] if fast_toc else []) + [
'--device', device, tocfile]
# PIPE is the closest to >/dev/null we can get
logger.debug("executing %r", cmd)
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
_, stderr = p.communicate()
if p.returncode != 0:
msg = 'cdrdao read-toc failed: return code is non-zero: ' + \
str(p.returncode)
logger.critical(msg)
# Gracefully handle missing disc
if "ERROR: Unit not ready, giving up." in stderr:
raise EjectError(device, "no disc detected")
raise IOError(msg)
toc = TocFile(tocfile)
toc.parse()
os.unlink(tocfile)
return toc
def read_toc(device, fast_toc=False):
"""
Return cdrdao-generated table of contents for 'device'.
"""
# cdrdao MUST be passed a non-existing filename as its last argument
# to write the TOC to; it does not support writing to stdout or
# overwriting an existing file, nor does linux seem to support
# locking a non-existant file. Thus, this race-condition introducing
# hack is carried from morituri to whipper and will be removed when
# cdrdao is fixed.
fd, tocfile = tempfile.mkstemp(suffix=u'.cdrdao.read-toc.whipper')
os.close(fd)
os.unlink(tocfile)
cmd = [CDRDAO, 'read-toc'] + (['--fast-toc'] if fast_toc else
[]) + ['--device', device, tocfile]
# PIPE is the closest to >/dev/null we can get
logger.debug("executing %r", cmd)
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
_, stderr = p.communicate()
if p.returncode != 0:
msg = 'cdrdao read-toc failed: return code is non-zero: ' + \
str(p.returncode)
logger.critical(msg)
# Gracefully handle missing disc
if "ERROR: Unit not ready, giving up." in stderr:
raise EjectError(device, "no disc detected")
raise IOError(msg)
toc = TocFile(tocfile)
toc.parse()
os.unlink(tocfile)
return toc
class ReadTOCTask(task.Task):
"""
Task that reads the TOC of the disc using cdrdao
"""
description = "Reading TOC"
toc = None
def __init__(self, device, fast_toc=False, toc_path=None):
"""
Read the TOC for 'device'.
:param device: block device to read TOC from
:type device: str
:param fast_toc: If to use fast-toc cdrdao mode
:type fast_toc: bool
:param toc_path: Where to save TOC if wanted.
:type toc_path: str
"""
self.device = device
self.fast_toc = fast_toc
self.toc_path = toc_path
self._buffer = "" # accumulate characters
self._parser = ProgressParser()
self.fd, self.tocfile = tempfile.mkstemp(
suffix='.cdrdao.read-toc.whipper.task')
def start(self, runner):
task.Task.start(self, runner)
os.close(self.fd)
os.unlink(self.tocfile)
cmd = ([CDRDAO, 'read-toc'] +
(['--fast-toc'] if self.fast_toc else []) +
['--device', self.device, self.tocfile])
self._popen = asyncsub.Popen(cmd,
bufsize=1024,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
self.schedule(0.01, self._read, runner)
def _read(self, runner):
ret = self._popen.recv_err()
if not ret:
if self._popen.poll() is not None:
self._done()
return
self.schedule(0.01, self._read, runner)
return
self._buffer += ret.decode()
# parse buffer into lines if possible, and parse them
if "\n" in self._buffer:
lines = self._buffer.split('\n')
if lines[-1] != "\n":
# last line didn't end yet
self._buffer = lines[-1]
del lines[-1]
else:
self._buffer = ""
for line in lines:
self._parser.parse(line)
if (self._parser.currentTrack != 0
and self._parser.tracks != 0):
progress = (float('%d' % self._parser.currentTrack) /
float(self._parser.tracks))
if progress < 1.0:
self.setProgress(progress)
# 0 does not give us output before we complete, 1.0 gives us output
# too late
self.schedule(0.01, self._read, runner)
def _poll(self, runner):
if self._popen.poll() is None:
self.schedule(1.0, self._poll, runner)
return
self._done()
def _done(self):
self.setProgress(1.0)
self.toc = TocFile(self.tocfile)
self.toc.parse()
if self.toc_path is not None:
t_comp = os.path.abspath(self.toc_path).split(os.sep)
t_dirn = os.sep.join(t_comp[:-1])
# If the output path doesn't exist, make it recursively
os.makedirs(t_dirn, exist_ok=True)
t_dst = truncate_filename(os.path.join(t_dirn,
t_comp[-1] + '.toc'))
shutil.copy(self.tocfile, os.path.join(t_dirn, t_dst))
os.unlink(self.tocfile)
self.stop()
return