Is app/defaults/services.yml distributed?

[openbrian]

Is it correct to assume app/default/services is distributed? In other words if Amp is packaged, would it be distributed to every installation of Amp? I ask because a simple config command would not put ram_disk_type in my .amp repo, but Application.php assumes it's available.

[totten]

Correct -- app/default/services.yml is the read-only version distributed with the app. When a user performs configuration (with amp config via service config.repository) the local preferences are written out to ~/.amp/services.yml (which overrides any defaults from the distributed copy).

(In Application.php, the variable $appDir might be poorly named -- it really points to ~/.amp. When services/parameters are consumed at runtime, they are actually loaded via $configDirectories -- which is a search-path that includes both ~/.amp and app/default.)