Fix some CLI bugs

Author: ldez

docs/content/reference/static-configuration/cli.txt

@@ -1,4 +1,3 @@
-
 --accesslog  (Default: "false")
     Access log settings.
 
@@ -173,6 +172,9 @@
 --hostresolver.resolvdepth  (Default: "5")
     The maximal depth of DNS recursive resolving
 
+--log  (Default: "false")
+    Traefik log settings.
+
 --log.filepath  (Default: "")
     Traefik log file path. Stdout is used when omitted or empty.
 

docs/content/reference/static-configuration/env.md

@@ -165,6 +165,9 @@ resolv.conf used for DNS resolving (Default: ```/etc/resolv.conf```)
 `TRAEFIK_HOSTRESOLVER_RESOLVDEPTH`:  
 The maximal depth of DNS recursive resolving (Default: ```5```)
 
+`TRAEFIK_LOG`:  
+Traefik log settings. (Default: "false")
+
 `TRAEFIK_LOG_FILEPATH`:  
 Traefik log file path. Stdout is used when omitted or empty.
 

pkg/cli/commands.go

@@ -128,5 +128,5 @@ func contains(cmds []*Command, name string) bool {
 }
 
 func isFlag(arg string) bool {
-	return len(arg) > 0 && arg[1] == '-'
+	return len(arg) > 0 && arg[0] == '-'
 }

pkg/config/static/static_config.go

@@ -55,7 +55,7 @@ type Configuration struct {
 	Ping    *ping.Handler  `description:"Enable ping." export:"true" label:"allowEmpty"`
 	// Rest    *rest.Provider `description:"Enable Rest backend with default settings" export:"true"`
 
-	Log       *types.TraefikLog `description:"Traefik log settings." export:"true"`
+	Log       *types.TraefikLog `description:"Traefik log settings." export:"true" label:"allowEmpty"`
 	AccessLog *types.AccessLog  `description:"Access log settings." export:"true" label:"allowEmpty"`
 	Tracing   *Tracing          `description:"OpenTracing configuration." export:"true" label:"allowEmpty"`