Add a way to disable update checker making an http request

README.md

@@ -33,6 +33,15 @@ http_proxy=http://<proxy host>:<proxy port>
 https_proxy=https://<proxy host>:<proxy port>
 ```
 
+## Disable update checking
+
+By default the CLI is making an HTTP request to learn if a newer version is available.
+To disable this feature, define the environment variable:
+
+```
+DISABLE_UPDATE_CHECKER=true
+```
+
 ## Command help
 
 ```

config/config.go

@@ -16,19 +16,20 @@ import (
 )
 
 type Config struct {
-	ScalingoApiUrl     string
-	apiHost            string
-	TokenGenerator     scalingo.TokenGenerator
-	ApiVersion         string
-	DisableInteractive bool
-	SshHost            string
-	UnsecureSsl        bool
-	RollbarToken       string
-	ConfigDir          string
-	AuthFile           string
-	LogFile            string
-	logFile            *os.File
-	Logger             *log.Logger
+	ScalingoApiUrl       string
+	apiHost              string
+	TokenGenerator       scalingo.TokenGenerator
+	ApiVersion           string
+	DisableInteractive   bool
+	DisableUpdateChecker bool
+	SshHost              string
+	UnsecureSsl          bool
+	RollbarToken         string
+	ConfigDir            string
+	AuthFile             string
+	LogFile              string
+	logFile              *os.File
+	Logger               *log.Logger
 }
 
 var (

update/check.go

@@ -15,11 +15,16 @@ import (
 var (
 	lastVersionURL = "https://cli-dl.scalingo.io/version"
 	lastVersion    = ""
+	cancelUpdate   = make(chan struct{})
 	gotLastVersion = make(chan struct{})
 	gotAnError     = false
 )
 
 func init() {
+	if config.C.DisableUpdateChecker {
+		close(cancelUpdate)
+		return
+	}
 	go func() {
 		var err error
 		lastVersion, err = getLastVersion()
@@ -39,7 +44,11 @@ func Check() error {
 		return nil
 	}
 
-	<-gotLastVersion
+	select {
+	case <-cancelUpdate:
+		return nil
+	case <-gotLastVersion:
+	}
 
 	if gotAnError {
 		return errgo.New("Update checker: connection error")