Merge remote-tracking branch 'origin'

5 files changed, 12 insertions, 9 deletions

diff --git a/AUTHORS b/AUTHORS
index 490baad..6c7e9b9 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1 +1,4 @@
 Creator: Sebastian Thiel
+
+Contributors:
+  - Ram Rachum (@cool-RR)
diff --git a/gitdb/__init__.py b/gitdb/__init__.py
index 813fe5a..2e127ca 100644
--- a/gitdb/__init__.py
+++ b/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 --git a/gitdb/db/loose.py b/gitdb/db/loose.py
index 7bf92da..a63a2ef 100644
--- a/gitdb/db/loose.py
+++ b/gitdb/db/loose.py
@@ -138,12 +138,12 @@ class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
                 # 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 --git a/gitdb/db/mem.py b/gitdb/db/mem.py
index 8711334..5b242e4 100644
--- a/gitdb/db/mem.py
+++ b/gitdb/db/mem.py
@@ -74,8 +74,8 @@ class MemoryDB(ObjectDBR, ObjectDBW):
             # 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 --git a/gitdb/util.py b/gitdb/util.py
index d680f97..c4cafec 100644
--- a/gitdb/util.py
+++ b/gitdb/util.py
@@ -326,8 +326,8 @@ class LockedFD(object):
             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