Add error code for unexpected errors in conversion

dangerzone/conversion/doc_to_pixels.py

@@ -373,9 +373,9 @@ async def main() -> int:
         error_code = 0  # Success!
     except errors.ConversionException as e:  # Expected Errors
         error_code = e.error_code
-    except (RuntimeError, TimeoutError, ValueError) as e:  # Unexpected Errors
+    except Exception as e:
         converter.update_progress(str(e), error=True)
-        error_code = 1
+        error_code = errors.UnexpectedConversionError.error_code
     if not running_on_qubes():
         # Write debug information (containers version)
         with open("/tmp/dangerzone/captured_output.txt", "wb") as container_log:

dangerzone/conversion/doc_to_pixels_qubes_wrapper.py

@@ -72,9 +72,12 @@ async def main() -> None:
         converter = DocumentToPixels()
         await converter.convert()
     except errors.ConversionException as e:
+        await write_bytes(str(e).encode(), file=sys.stderr)
         sys.exit(e.error_code)
-    except (RuntimeError, TimeoutError, ValueError) as e:
-        sys.exit(1)
+    except Exception as e:
+        await write_bytes(str(e).encode(), file=sys.stderr)
+        error_code = errors.UnexpectedConversionError.error_code
+        sys.exit(error_code)
 
     num_pages = len(list(out_dir.glob("*.rgb")))
     await write_int(num_pages)

dangerzone/conversion/errors.py

@@ -3,6 +3,7 @@ from typing import List, Optional, Type
 # XXX: errors start at 128 for conversion-related issues
 ERROR_SHIFT = 128
 
+
 class ConversionException(Exception):
     error_message = "Unspecified error"
     error_code = ERROR_SHIFT
@@ -67,6 +68,11 @@ class PDFtoPPMInvalidDepth(PDFtoPPMException):
     error_message = "Error converting PDF to Pixels (Invalid PPM depth)"
 
 
+class UnexpectedConversionError(PDFtoPPMException):
+    error_code = ERROR_SHIFT + 100
+    error_message = "Some unxpected error occured while converting the document"
+
+
 def exception_from_error_code(error_code: int) -> Optional[ConversionException]:
     """returns the conversion exception corresponding to the error code"""
     for cls in ConversionException.get_subclasses():