Adding setup command for rmt-cli to update database and scc configs

Resolution for issue#987 : SUSE#987

MANUAL.md

@@ -22,6 +22,9 @@ You can install and run this wizard like this:
 
 ## USAGE
 
+  * `rmt-cli setup`:
+    This command is responsibile for creating and updating the user configurations for RMT. If the user has defined configurations previously and wishes to update them, it interactively suggests these previously set values for user to review before updating them.
+
   * `rmt-cli sync`:
     RMT comes with a preconfigured systemd timer to automatically get the latest product and repository data from the SUSE Customer Center over night.
     This command triggers the same synchronization instantly.

lib/rmt/cli/main.rb

@@ -14,6 +14,11 @@ def sync
   desc 'products', _('List and modify products')
   subcommand 'products', RMT::CLI::Products
 
+  desc 'setup', _('Configure RMT')
+  def setup
+    RMT::CLI::Setup.start
+  end
+
   desc 'repos', _('List and modify repositories')
   subcommand 'repos', RMT::CLI::Repos
 

lib/rmt/cli/setup.rb

@@ -0,0 +1,128 @@
+class RMT::CLI::Setup < RMT::CLI::Base
+  CONFIG_FILE = '/etc/rmt.conf'.freeze
+  DEVELOPMENT_CONFIG_FILE = './config/rmt.yml'.freeze
+  DB_CONFIG = 'database'.freeze
+  SCC_CONFIG = 'scc'.freeze
+
+  desc 'setup', _('Update user configurations required for RMT setup')
+  def setup
+    puts _('-------- Starting RMT server setup ---------')
+    copy_to_config_file unless File.exist?(CONFIG_FILE)
+    update_config
+    confirm_details_and_save
+  end
+
+  private
+
+  # Copies the development config file to the main config file for RMT
+  def copy_to_config_file
+    puts "\n" + (_('Could not find config at %{config_file}') % { config_file: CONFIG_FILE })
+    puts _('Copying config from %{development_config_file} to %{config_file}') % { development_config_file: DEVELOPMENT_CONFIG_FILE,
+                                                                                   config_file: CONFIG_FILE }
+    begin
+      FileUtils.cp(DEVELOPMENT_CONFIG_FILE, CONFIG_FILE)
+      puts _('Config copied successfully!')
+    rescue StandardError => e
+      puts _('Failed to copy configuration. Error : %{error_message}') % { error_message: e.message }
+      abort _('Aborting.')
+    end
+  end
+
+  # Prompts user to specify new configs or uses previously set config
+  def update_config
+    @config = YAML.load_file(CONFIG_FILE)
+
+    @new_config = {}
+    puts "\n" + _('Please enter the following database configurations: ')
+    @new_config[DB_CONFIG] = {}
+    @new_config[DB_CONFIG]['database'] = input_prompt_generator('database', @config[DB_CONFIG]['database'])
+    @new_config[DB_CONFIG]['username'] = input_prompt_generator('username', @config[DB_CONFIG]['username'])
+    @new_config[DB_CONFIG]['password'] = input_prompt_generator('password', @config[DB_CONFIG]['password'], sensitive_data: true)
+
+    puts "\n\n" + _('Please enter your SCC credentials: ')
+    puts _('NOTE: You can find them in https://scc.suse.com under the Proxies tab.')
+    @new_config[SCC_CONFIG] ||= {}
+    @new_config[SCC_CONFIG]['username'] = input_prompt_generator('username', @config[SCC_CONFIG]['username'])
+    @new_config[SCC_CONFIG]['password'] = input_prompt_generator('password', @config[SCC_CONFIG]['password'], sensitive_data: true)
+  end
+
+  def confirm_details_and_save
+    loop do
+      input = ask("\n\n" + _('Would you like to save the updated configuration? (y/n/exit) : ')).downcase
+
+      case input
+      when 'y'
+        # Merging updated configs with the older config for updation and saving result to CONFIG_FILE
+        @config = @config.deep_merge(@new_config)
+        begin
+          File.write(CONFIG_FILE, @config.to_yaml)
+        rescue StandardError
+          puts _('Failed to save config. Please retry.')
+        end
+        puts _('Successfully updated the configuration!')
+        restart_rmt
+        break
+      when 'n'
+        update_config
+      when 'exit'
+        confirmation = ask(_('You are attempting to exit before saving the configuration. Are you sure? (y/n) : ')).downcase
+        if confirmation == 'y'
+          puts _('Aborted')
+          break
+        elsif confirmation == 'n'
+          next
+        else
+          puts _('Invalid input. Please try again.')
+        end
+      else
+        puts _('Invalid input. Please try again.')
+
+      end
+    end
+
+  end
+
+  # Constructs the prompt message to be displayed to users to fetch config field data
+  # Displays the existing default value to the user, if present
+  # Example => username (Press enter for John ) :
+  def input_prompt_generator(config_field, default_value, sensitive_data: false)
+    prompt = config_field.to_s
+
+    # Show default_value as "*****" for sensitive fields
+    unless default_value.empty?
+      prompt << ' ('
+      prompt << _('Press enter for ')
+      prompt << "#{sensitive_data ? '*****' : default_value} "
+      prompt << ')'
+    end
+    prompt << ' : '
+
+    input = ask(prompt, echo: !sensitive_data)
+    input.empty? ? default_value : input
+  end
+
+  # Restarts the RMT process
+  def restart_rmt
+    loop do
+      puts "\n" + _('RMT must be restarted with the updated configuration.')
+      input = ask(_('Restart RMT automatically? (y/n) : ')).downcase
+      case input
+      when 'y'
+        begin
+          puts _('Restarting RMT server. Please wait.')
+          `systemctl restart rmt-server`
+          puts _('Successfully restarted RMT server.')
+        rescue StandardError => e
+          puts _('Failed to restart RMT server. Error : %{error_message}') % { error_message: e.message }
+        end
+        break
+      when 'n'
+        puts _('Please restart the RMT server manually.')
+        break
+      else
+        puts _('Invalid input. Please try again.')
+      end
+    end
+  end
+
+end