Added support for templates to file provider

configuration/configuration.go

@@ -239,8 +239,8 @@ func (gc *GlobalConfiguration) SetEffectiveConfiguration(configFile string) {
 	}
 
 	// Try to fallback to traefik config file in case the file provider is enabled
-	// but has no file name configured.
-	if gc.File != nil && len(gc.File.Filename) == 0 {
+	// but has no file name configured and is not in a directory mode.
+	if gc.File != nil && len(gc.File.Filename) == 0 && len(gc.File.Directory) == 0 {
 		if len(configFile) > 0 {
 			gc.File.Filename = configFile
 		} else {

configuration/configuration_test.go

@@ -77,6 +77,11 @@ func TestSetEffectiveConfigurationFileProviderFilename(t *testing.T) {
 			fileProvider:             &file.Provider{BaseProvider: provider.BaseProvider{Filename: "other.toml"}},
 			wantFileProviderFilename: "other.toml",
 		},
+		{
+			desc:                     "directory for file provider given",
+			fileProvider:             &file.Provider{Directory: "/"},
+			wantFileProviderFilename: "",
+		},
 	}
 
 	for _, test := range tests {