starting failed because of missing /var/lib/ergw

[grundrauschen]

I am trying to run erGW in a configuration as gtp-c-node in a Docker container.
The release was built with rebar3 and then copied.
During bootup the following error message appeared: 18:48:14.552 [error] Failed to read /var/lib/ergw/ergw.state with no such file or directory.
After creation of /var/lib/ergw/ the error did not come up again.
It would be great if the software could be patched, so that it creates the folder during bootup if it is missing.

(the build recipe can be found at https://github.com/travelping/ergw-gtp-c-node-docker and the built docker image at https://hub.docker.com/r/grundrausch3n/ergw-gtp-c-node/)

[RoadRunnr]

creating directories (especially a directory in /var/lib) is not the task of an application. It has do be done by some external management entity (human administrator, packing system, deployment instrumentation, ....).

The reason is that the application can not:

1. know what permission and ownership that directory should have
2. might not even have the permission to create a directory in that place (in this case it would require write permission to /var/lib, there are many reason why a erGW instance might not have that, e.g. selinux, apparmor, ....)
3. it is not common for Unix application to create directories automatically outside of an directory hierarchy that has been assigned to them (by policy). Creating sub-directories inside of /var/lib/ergw/ would be ok.

So, to summarize, it's not the applications to create that directory. Make sure your installation or packaging process does create that directory.