Fix warnings in running jupyter instance due to undefined environment variables (#1)

* Fix warnings due to undefined environment variables

* Adds auto-commit and file download facility

Author: vharsh

jupyter_notebook_config.py

@@ -7,7 +7,9 @@
 github_user_name = os.getenv("GITHUB_USERNAME")
 user_email = os.getenv("USER_EMAIL")
 user_token = os.getenv("GITHUB_TOKEN")
-branch_name = uuid.uuid4().hex + '-'+ github_user_name
+if github_user_name:
+    global branch_name
+    branch_name = uuid.uuid4().hex + '-' + github_user_name
 
 # Configuration file for jupyter-notebook.
 
@@ -599,9 +601,11 @@ def gitconfig(user_name, user_email, user_token, branch_name):
     out, err, retcode = _system('git remote set-url origin ' + final_url)
     out, err, retcode = _system('git checkout -b ' + branch_name)
 
-gitconfig(user_name, user_email, user_token, branch_name)
 
-c.FileContentsManager.post_save_hook = save
+# Only create a post-save hook if required env vars are set
+if user_name and github_user_name and user_email and user_token:
+    gitconfig(user_name, user_email, user_token, branch_name)
+    c.FileContentsManager.post_save_hook = save
 
 ## 
 #c.FileContentsManager.root_dir = ''
@@ -648,4 +652,4 @@ def gitconfig(user_name, user_email, user_token, branch_name):
 ## Whitelist of allowed kernel names.
 #  
 #  By default, all installed kernels are allowed.
-#c.KernelSpecManager.whitelist = set()
+#c.KernelSpecManager.whitelist = set()

launch.sh

@@ -3,6 +3,8 @@
 echo "Fetching notebooks from" $GIT_REPO
 
 git clone $GIT_REPO /home/notebooks
+cp jupyter_notebook_config.py /home/notebooks/
+cp openebs_utils.py /home/notebooks/
 
 echo "Running Notebook"
-/opt/conda/bin/jupyter notebook --ip='*' --notebook-dir=/home --port=8888 --no-browser
+/opt/conda/bin/jupyter notebook --ip='*' --notebook-dir=/home --port=8888 --no-browser