Merge pull request #337 from yuvipanda/better-output

Provide much better error messages

tljh/installer.py

@@ -22,6 +22,7 @@ from tljh import (
     systemd,
     traefik,
     user,
+    utils
 )
 from .config import (
     CONFIG_DIR,
@@ -35,7 +36,6 @@ from .yaml import yaml
 
 HERE = os.path.abspath(os.path.dirname(__file__))
 
-
 logger = logging.getLogger("tljh")
 
 def ensure_node():
@@ -172,7 +172,7 @@ def ensure_jupyterlab_extensions():
         '@jupyterlab/hub-extension',
         '@jupyter-widgets/jupyterlab-manager'
     ]
-    subprocess.check_output([
+    utils.run_subprocess([
         os.path.join(USER_ENV_PREFIX, 'bin/jupyter'),
         'labextension',
         'install'