show user friendly error if git is not found

Author: sagor999

components/supervisor/cmd/init.go

@@ -38,6 +38,13 @@ var initCmd = &cobra.Command{
 		)
 		signal.Notify(sigInput, os.Interrupt, syscall.SIGTERM)
 
+		// check if git executable exists, supervisor will fail if it doesn't
+		// checking for it here allows to bubble up this error to the user
+		_, err = exec.LookPath("git")
+		if err != nil {
+			log.WithError(err).Fatal("cannot find git executable, make sure it is installed as part of gitpod image")
+		}
+
 		supervisorPath, err := os.Executable()
 		if err != nil {
 			supervisorPath = "/.supervisor/supervisor"

components/supervisor/pkg/supervisor/supervisor.go

@@ -188,6 +188,7 @@ func Run(options ...RunOption) {
 		log.WithError(err).Fatal("cannot ensure Gitpod user exists")
 	}
 	symlinkBinaries(cfg)
+
 	configureGit(cfg, childProcEnvvars)
 
 	tokenService := NewInMemoryTokenService()