migrate writes marker file in read only directory

[robertlugg]

I have defined JUPYTER_CONFIG_DIR which points to a directory which is read only. When migration.py tries to "touch" a marker file, it fails. This makes placing your config file in a read-only location not possible (such as inside a container).

Please refer to this line:

jupyter_core/jupyter_core/migrate.py

Line 247 in b129001

with open(os.path.join(env['jupyter_config'], 'migrated'), 'w') as f:

My suggestion is to instead just silently fail if not possible to write.

[jasongrout]

My suggestion is to instead just silently fail if not possible to write.

That makes sense to me. Can you submit a PR?

Is this the only issue you are seeing with a read only config directory?