* morituri/common/common.py:

Add MissingDependencyException.
	* morituri/program/cdrdao.py:
	* morituri/rip/main.py:
	  Use it to warn about missing cdrdao.

ChangeLog

@@ -1,3 +1,11 @@
+2010-06-19  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* morituri/common/common.py:
+	  Add MissingDependencyException.
+	* morituri/program/cdrdao.py:
+	* morituri/rip/main.py:
+	  Use it to warn about missing cdrdao.
+
 2010-06-18  Thomas Vander Stichele  <thomas at apestaart dot org>
 
 	* morituri/common/task.py:

morituri/common/common.py

@@ -205,3 +205,10 @@ def tagListEquals(tl1, tl2):
     d2 = tagListToDict(tl2)    
 
     return d1 == d2
+
+class MissingDependencyException(Exception):
+    dependency = None
+
+    def __init__(self, *args):
+        self.args = args
+        self.dependency = args[0]

morituri/program/cdrdao.py

@@ -250,10 +250,18 @@ class CDRDAOTask(task.Task):
         task.Task.start(self, runner)
 
         bufsize = 1024
-        self._popen = asyncsub.Popen(["cdrdao", ] + self.options,
-            bufsize=bufsize,
-            stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE, close_fds=True)
+        try:
+            self._popen = asyncsub.Popen(["cdrdao", ] + self.options,
+                bufsize=bufsize,
+                stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE, close_fds=True)
+        except OSError, e:
+            import errno
+            if e.errno == errno.ENOENT:
+                raise common.MissingDependencyException('cdrdao')
+
+            raise
+
         self.debug('Started cdrdao with pid %d and options %r',
             self._popen.pid, self.options)
 

morituri/rip/main.py

@@ -3,7 +3,7 @@
 
 import sys
 
-from morituri.common import log, logcommand
+from morituri.common import log, logcommand, common, task
 from morituri.rip import cd, offset, drive, image
 
 def main(argv):
@@ -18,6 +18,12 @@ def main(argv):
         raise
         # deps.handleImportError(e)
         # ret = -1
+    except task.TaskException, e:
+        if isinstance(e.exception, common.MissingDependencyException):
+            sys.stderr.write('rip: error: missing dependency "%s"\n' %
+                e.exception.dependency)
+            return 255
+        raise
 
     if ret is None:
         return 0