--config flag doesn't work

[RazerM]

Oathkeeper ignores the --config parameter:

$ cat ~/.oathkeeper-api.yml
DATABASE_URL: postgres://.../oathkeeper
...
$ oathkeeper serve --config ~/.oathkeeper-api.yml api
FATA[0000] Unable to initialize database connectivity    error="No database URL provided"

It seems this is because viper.SetConfigName unsets configFile:

oathkeeper/cmd/root.go

Lines 74 to 78 in 3c0c862

	if cfgFile != "" { // enable ability to specify config file via flag
	viper.SetConfigFile(cfgFile)
	}
	viper.SetConfigName(".oathkeeper") // name of config file (without extension)

[aeneasr]

The intended way is to actually load this from env vars as those are usually not compromised if the filesystem is compromised, and are easier to use in PaaS (Kubernetes, Heroku, ECS) as well as in Docker. It is confusing though that --config exists.

[RazerM]

I'm aware of that, --config is still broken though.

[aeneasr]

Do you intend on using --config? I think we'll just remove the option.

[RazerM]

No, I was just getting it started for some testing on my local machine. Removal would be fine with me.