Seek configuration file from default places

docs/config/index.md

@@ -15,7 +15,14 @@ For example, the `DIUN_PROVIDERS_DOCKER` environment variable is enough by itsel
 
 ## Configuration file
 
-You can define a configuration file through the option `--config` with the following content:
+At startup, Diun searches for a file named `diun.yml` (or `diun.yaml`) in:
+
+* `/etc/diun/`
+* `$XDG_CONFIG_HOME/`
+* `$HOME/.config/`
+* `.` _(the working directory)_
+
+You can override this using the [`--config` flag or `CONFIG` env var](../usage/cli.md).
 
 ??? example "diun.yml"
     ```yaml

docs/install/docker.md

@@ -100,7 +100,6 @@ services:
       - "./diun.yml:/diun.yml:ro"
       - "/var/run/docker.sock:/var/run/docker.sock"
     environment:
-      - "CONFIG=/diun.yml"
       - "TZ=Europe/Paris"
       - "LOG_LEVEL=info"
       - "LOG_JSON=false"

docs/usage/basic-example.md

@@ -47,7 +47,6 @@ services:
       - "./diun.yml:/diun.yml:ro"
       - "/var/run/docker.sock:/var/run/docker.sock"
     environment:
-      - "CONFIG=/diun.yml"
       - "TZ=Europe/Paris"
       - "LOG_LEVEL=info"
       - "LOG_JSON=false"

internal/config/config.go

@@ -28,6 +28,10 @@ func Load(cfgfile string) (*Config, error) {
 
 	fileLoader := gonfig.NewFileLoader(gonfig.FileLoaderConfig{
 		Filename: cfgfile,
+		Finder: gonfig.Finder{
+			BasePaths:  []string{"/etc/diun/diun", "$XDG_CONFIG_HOME/diun", "$HOME/.config/diun", "./diun"},
+			Extensions: []string{"yaml", "yml"},
+		},
 	})
 	if found, err := fileLoader.Load(&cfg); err != nil {
 		return nil, errors.Wrap(err, "Failed to decode configuration from file")
@@ -45,7 +49,7 @@ func Load(cfgfile string) (*Config, error) {
 	} else if !found {
 		log.Debug().Msg("No DIUN_* environment variables defined")
 	} else {
-		log.Info().Msgf("Configuration loaded from %d environment variables", len(envLoader.GetVars()))
+		log.Info().Msgf("Configuration loaded from %d environment variable(s)", len(envLoader.GetVars()))
 	}
 
 	validate := validator.New()