Add a clear warning when the user is not runing koyeb login in a terminal

Author: bchatelard

go.mod

@@ -25,6 +25,7 @@ require (
 
 require (
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
+	github.com/andrew-d/go-termutil v0.0.0-20150726205930-009166a695a2 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d // indirect
 	github.com/chzyer/readline v1.5.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect

go.sum

@@ -44,6 +44,8 @@ github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tN
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
+github.com/andrew-d/go-termutil v0.0.0-20150726205930-009166a695a2 h1:axBiC50cNZOs7ygH5BgQp4N+aYrZ2DNpWZ1KG3VOSOM=
+github.com/andrew-d/go-termutil v0.0.0-20150726205930-009166a695a2/go.mod h1:jnzFpU88PccN/tPPhCpnNU8mZphvKxYM9lLNkd8e+os=
 github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d h1:Byv0BzEl3/e6D5CLfI0j/7hiIEtvGVFPCZ7Ei2oq8iQ=
 github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=

pkg/koyeb/login.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 
+	termutil "github.com/andrew-d/go-termutil"
 	"github.com/manifoldco/promptui"
 	homedir "github.com/mitchellh/go-homedir"
 	log "github.com/sirupsen/logrus"
@@ -26,6 +27,10 @@ func Login(cmd *cobra.Command, args []string) error {
 	}
 	viper.SetConfigFile(configPath)
 
+	if !termutil.Isatty(os.Stdin.Fd()) {
+		log.Fatalf("Unable to read from stdin, please launch the command in interactive mode")
+	}
+
 	writeFileMessage := fmt.Sprintf("Do you want to create a new configuration file in (%s)", configPath)
 	if _, err := os.Stat(configPath); !errors.Is(err, os.ErrNotExist) {
 		writeFileMessage = fmt.Sprintf("Do you want to update configuration file (%s)", configPath)