commands/operator-sdk: Add better error message when dep is not installed or not in path

Fix #163

Author: theishshah

commands/operator-sdk/cmd/new.go

@@ -161,6 +161,10 @@ func execCmd(stdout *os.File, cmd string, args ...string) {
 }
 
 func pullDep() {
+	_, err := exec.LookPath(dep)
+	if err != nil {
+		cmdError.ExitWithError(cmdError.ExitError, fmt.Errorf("Looking for dep in $PATH: %v", err))
+	}
 	fmt.Fprintln(os.Stdout, "Run dep ensure ...")
 	execCmd(os.Stdout, dep, ensureCmd, "-v")
 	fmt.Fprintln(os.Stdout, "Run dep ensure done")