Merge pull request #754 from ThomasWaldmann/0.xx-maint

fix silently ignoring I/O errors

borg/_chunker.c

@@ -152,6 +152,7 @@ chunker_fill(Chunker *c)
         }
         else {
             // some error happened
+            PyErr_SetFromErrno(PyExc_OSError);
             return 0;
         }
         length = c->bytes_read - offset;

docs/changes.rst

@@ -24,6 +24,7 @@ Compatibility / maintenance notes:
 
 Bug fixes:
 
+- silently skips disk I/O errors, includes truncated files into archive, #748
 - seeking to an invalid position is an IOError in python 3.2, #621
 - Cache: fix exception handling in __init__, release lock, #610