fix(cmd): throw GitCommandNotFoundError ...

... if it is not found. Previously, especially on windows, this wasn't
explicit.

Fixes #248, affects #126

1 files changed, 6 insertions, 0 deletions

diff --git a/git/exc.py b/git/exc.py
index 7ee6726e..f5b52374 100644
--- a/git/exc.py
+++ b/git/exc.py
@@ -18,6 +18,12 @@ class NoSuchPathError(OSError):
     """ Thrown if a path could not be access by the system. """
 
 
+class GitCommandNotFound(Exception):
+    """Thrown if we cannot find the `git` executable in the PATH or at the path given by
+    the GIT_PYTHON_GIT_EXECUTABLE environment variable"""
+    pass
+
+
 class GitCommandError(Exception):
     """ Thrown if execution of the git command fails with non-zero status code. """