Add configure command

cmd/reva/configure.go

@@ -0,0 +1,47 @@
+// Copyright 2018-2020 CERN
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+)
+
+var configureCommand = func() *command {
+	cmd := newCommand("configure")
+	cmd.Description = func() string { return "configure the reva client" }
+	cmd.Action = func(w ...io.Writer) error {
+		reader := bufio.NewReader(os.Stdin)
+		fmt.Print("host: ")
+		text, err := read(reader)
+		if err != nil {
+			return err
+		}
+
+		c := &config{Host: text}
+		if err := writeConfig(c); err != nil {
+			return err
+		}
+		fmt.Println("config saved at ", getConfigFile())
+		return nil
+	}
+	return cmd
+}

cmd/reva/executor.go

@@ -45,6 +45,17 @@ func (e *Executor) Execute(s string) {
 
 	args := strings.Split(s, " ")
 
+	// Verify that the configuration is set, either in memory or in a file.
+	if conf.Host == "" {
+		c, err := readConfig()
+		if err != nil && args[0] != "configure" {
+			fmt.Println("reva is not configured, please run the configure command")
+			return
+		} else if args[0] != "configure" {
+			conf = c
+		}
+	}
+
 	action := args[0]
 	for _, v := range commands {
 		if v.Name == action {

cmd/reva/main.go

@@ -39,6 +39,7 @@ var (
 
 	commands = []*command{
 		versionCommand(),
+		configureCommand(),
 		loginCommand(),
 		whoamiCommand(),
 		importCommand(),
@@ -82,14 +83,7 @@ func init() {
 
 func main() {
 
-	if host == "" {
-		c, err := readConfig()
-		if err != nil {
-			fmt.Println("reva is not configured, please pass the \"-host\" flag")
-			os.Exit(1)
-		}
-		conf = c
-	} else {
+	if host != "" {
 		conf = &config{host}
 		if err := writeConfig(conf); err != nil {
 			fmt.Println("error writing to config file")