在使用Capistrano的Ruby on Rails服務器上發生Mountpoint錯誤

Question

我正在嘗試使用Capistrano自動部署應用程序。除了s3安裝和卸載配方之外，我幾乎完成了所有任務。

這是我寫的配方，它在某些條件下工作，並且在某些條件下不起作用。但是，如果我手動登錄到服務器並自己執行它們，配方中使用的命令將運行。

desc "Mounting S3 for the first time" 
    task :mounting_s3 do 
     on %w(uat2_sub1 uat2_main), in: :sequence, wait: 5 do |host| 
      as 'cc' do 
       within '/var/www/test_cap/current' do 
        code_folder = "/var/www/test_cap/current" 
        path = "/var/www/test_cap/current/public/system" 
        unmount_path = "/var/www/test_cap/shared/public/system" 

        # check first if public/system exists 
        puts "** Checking if public/system folder exists on #{host}" 
        if test("[ -d #{path} ]") 
         puts "** public/system folder exists.." 
         puts "** Checking if S3 is mounted" 
         result = execute! "mountpoint #{path}" 
         puts "result #{result}" 
         if result.match('is a mountpoint') != nil 
          puts "** S3 is mounted at #{path} on #{host}" 
          puts "** unmounting s3 at #{unmount_path}" 
          execute! "fusermount -u #{unmount_path}" 
          puts "** s3 unmounted at #{unmount_path} on #{host}" 
         elsif result.match('is not a mountpoint') != nil 
          puts "** #{path} is not a mountpoint on #{host}"  
         end 
        else 
         puts "** public/system folder does not exists.." 
         puts "** Mounting S3" 
         execute! "cd #{code_folder} && s3fs cc-system-uat #{path}" 
        end 
       end 
      end 
     end 
    end 

我能夠卸載S3從Capistrano的使用fusermount -u如果我從服務器安裝S3自己。

同樣我可以安裝s3從capistrano如果我有從服務器自己卸載s3。

我運行的所有命令爲cc用戶。我仍然不明白爲什麼我會收到以下錯誤。在日誌中可以看到公共/系統不是一個掛載點，但我無法從這一點前進。因爲我想將掛載點「public/system」的結果存儲在一個變量中，然後執行不同的任務。

** Invoke bundler:map_bins (first_time) 
** Execute bundler:map_bins 
** Invoke deploy:set_rails_env (first_time) 
** Execute deploy:set_rails_env 
** Invoke deploy:set_linked_dirs (first_time) 
** Execute deploy:set_linked_dirs 
** Invoke deploy:set_rails_env 
** Invoke deploy:mounting_s3 (first_time) 
** Execute deploy:mounting_s3 
** Checking if public/system folder exists on uat2_sub1 
** public/system folder exists.. 
** Checking if S3 is mounted 
00:00 deploy:mounting_s3 
     01 mountpoint /var/www/test_cap/current/public/system 
     01 /var/www/test_cap/current/public/system is not a mountpoint 
cap aborted! 
Exception while executing on host uat2_sub1: mountpoint /var/www/test_cap/current/public/system exit status: 1 
mountpoint /var/www/test_cap/current/public/system stdout: /var/www/test_cap/current/public/system is not a mountpoint 
mountpoint /var/www/test_cap/current/public/system stderr: Nothing written 
/home/xyz/.rvm/gems/ruby-2.1.0/gems/sshkit-1.11.4/lib/sshkit/runners/sequential.rb:31:in `rescue in run_backend' 

Answer 1

這個raise_on_non_zero_exit: false選項固定它。如果沒有輸出，實際上會捕獲錯誤。

result = capture "cd #{code_folder} && mountpoint public/system" , raise_on_non_zero_exit: false