cdrdao no-disc ejection & --eject (#93)

* cdrdao: eject empty disc while reading toc

- introduce EjectError
- move {eject,load,unmount}_device to program.utils

* remove duplicated eject

* remove unnecessary ejection

* add --eject option

morituri/common/common.py

@@ -39,6 +39,19 @@ WORDS_PER_FRAME = SAMPLES_PER_FRAME * 2
 BYTES_PER_FRAME = SAMPLES_PER_FRAME * 4
 
 
+class EjectError(SystemError):
+    """
+    Possibly ejects the drive in command.main.
+    """
+    def __init__(self, device, *args):
+        """
+        args is a tuple used by BaseException.__str__
+        device is the device path to eject
+        """
+        self.args = args
+        self.device = device
+
+
 def msfToFrames(msf):
     """
     Converts a string value in MM:SS:FF to frames.

morituri/common/program.py

@@ -90,32 +90,6 @@ class Program:
             logger.info('Changing to working directory %s' % workingDirectory)
             os.chdir(workingDirectory)
 
-    def loadDevice(self, device):
-        """
-        Load the given device.
-        """
-        os.system('eject -t %s' % device)
-
-    def ejectDevice(self, device):
-        """
-        Eject the given device.
-        """
-        os.system('eject %s' % device)
-
-    def unmountDevice(self, device):
-        """
-        Unmount the given device if it is mounted, as happens with automounted
-        data tracks.
-
-        If the given device is a symlink, the target will be checked.
-        """
-        device = os.path.realpath(device)
-        logger.debug('possibly unmount real path %r' % device)
-        proc = open('/proc/mounts').read()
-        if device in proc:
-            print 'Device %s is mounted, unmounting' % device
-            os.system('umount %s' % device)
-
     def getFastToc(self, runner, toc_pickle, device):
         """
         Retrieve the normal TOC table from a toc pickle or the drive.