Merge remote-tracking branch 'origin'

Author: Byron

Diff for: AUTHORS

@@ -1 +1,4 @@
 Creator: Sebastian Thiel
+
+Contributors:
+  - Ram Rachum (@cool-RR)

Diff for: gitdb/__init__.py

@@ -18,8 +18,8 @@ def _init_externals():
 
         try:
             __import__(module)
-        except ImportError:
-            raise ImportError("'%s' could not be imported, assure it is located in your PYTHONPATH" % module)
+        except ImportError as e:
+            raise ImportError("'%s' could not be imported, assure it is located in your PYTHONPATH" % module) from e
         # END verify import
     # END handel imports
 

Diff for: gitdb/db/loose.py

@@ -138,12 +138,12 @@ def _map_loose_object(self, sha):
                 # try again without noatime
                 try:
                     return file_contents_ro_filepath(db_path)
-                except OSError:
-                    raise BadObject(sha)
+                except OSError as new_e:
+                    raise BadObject(sha) from new_e
                 # didn't work because of our flag, don't try it again
                 self._fd_open_flags = 0
             else:
-                raise BadObject(sha)
+                raise BadObject(sha) from e
             # END handle error
         # END exception handling
 

Diff for: gitdb/db/mem.py

@@ -74,8 +74,8 @@ def stream(self, sha):
             # rewind stream for the next one to read
             ostream.stream.seek(0)
             return ostream
-        except KeyError:
-            raise BadObject(sha)
+        except KeyError as e:
+            raise BadObject(sha) from e
         # END exception handling
 
     def size(self):

Diff for: gitdb/util.py

@@ -326,8 +326,8 @@ def open(self, write=False, stream=False):
             else:
                 self._fd = fd
             # END handle file descriptor
-        except OSError:
-            raise IOError("Lock at %r could not be obtained" % self._lockfilepath())
+        except OSError as e:
+            raise IOError("Lock at %r could not be obtained" % self._lockfilepath()) from e
         # END handle lock retrieval
 
         # open actual file if required