Step 1.4: Clone-on-write

[ziimakc]

Resolves Step 1.4

Task

Write a simple program which prints out the path to its configuration file. The path should be detected with the following precedence:

1. default path is /etc/app/app.conf;
2. if APP_CONF env var is specified (and not empty) then use it with higher priority than default;
3. if --conf command line argument is specified (error if empty) then use it with the highest priority.

If neither APP_CONF env var nor --conf command line argument is specified, then no allocation should happen for path detection.

Solution

Implement cow path resolution print.