PLT-6076 Read config file info from enviroment vars (#5873)

* Adding viper libs for config file changes

* Removing the old fsnotify lib

* updating some missing libs

* PLT-6076 Read config file info from enviroment vars

* Changing unit test to use less important props

utils/config_test.go

@@ -4,6 +4,7 @@
 package utils
 
 import (
+	"os"
 	"testing"
 )
 
@@ -12,3 +13,49 @@ func TestConfig(t *testing.T) {
 	LoadConfig("config.json")
 	InitTranslations(Cfg.LocalizationSettings)
 }
+
+func TestConfigFromEnviroVars(t *testing.T) {
+
+	os.Setenv("MM_TEAMSETTINGS_SITENAME", "From Enviroment")
+	os.Setenv("MM_TEAMSETTINGS_CUSTOMBRANDTEXT", "Custom Brand")
+	os.Setenv("MM_SERVICESETTINGS_ENABLECOMMANDS", "false")
+	os.Setenv("MM_SERVICESETTINGS_READTIMEOUT", "400")
+
+	TranslationsPreInit()
+	EnableConfigFromEnviromentVars()
+	LoadConfig("config.json")
+
+	if Cfg.TeamSettings.SiteName != "From Enviroment" {
+		t.Fatal("Couldn't read config from enviroment var")
+	}
+
+	if *Cfg.TeamSettings.CustomBrandText != "Custom Brand" {
+		t.Fatal("Couldn't read config from enviroment var")
+	}
+
+	if *Cfg.ServiceSettings.EnableCommands != false {
+		t.Fatal("Couldn't read config from enviroment var")
+	}
+
+	if *Cfg.ServiceSettings.ReadTimeout != 400 {
+		t.Fatal("Couldn't read config from enviroment var")
+	}
+
+	os.Unsetenv("MM_TEAMSETTINGS_SITENAME")
+	os.Unsetenv("MM_TEAMSETTINGS_CUSTOMBRANDTEXT")
+	os.Unsetenv("MM_SERVICESETTINGS_ENABLECOMMANDS")
+	os.Unsetenv("MM_SERVICESETTINGS_READTIMEOUT")
+
+	Cfg.TeamSettings.SiteName = "Mattermost"
+	*Cfg.ServiceSettings.SiteURL = ""
+	*Cfg.ServiceSettings.EnableCommands = true
+	*Cfg.ServiceSettings.ReadTimeout = 300
+	SaveConfig(CfgFileName, Cfg)
+
+	LoadConfig("config.json")
+
+	if Cfg.TeamSettings.SiteName != "Mattermost" {
+		t.Fatal("should have been reset")
+	}
+
+}