capistrano,「Insecure operation」でbundle installできない

Question

###前提・実現したいこと
現在Ruby(Ruby On Rails)でアプリケーションを開発しています。
ローカルからリモートサーバーにcapistranoでrailsアプリケーションをデプロイしたいのですが、capistranoの「bundler」のタスクを実行する際に、下記のログの通り、SSHKit::Runner::ExecuteError: Exception while executing as deploy_user@IP_address: bundle exit status: 1 bundle stdout: /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in expand_path': Insecure operation - expand_path (SecurityError)`でbundle installができない状態です。

###エラーログなど

.長いため省略しています
  INFO [5c9a0279] Running sudo rbenv exec bundle install --path /var/www/myapp/shared/bundle --without development test --deployment --quiet as deploy_user@153.126.179.98
 DEBUG [8c7ee5b1] Command: cd /var/www/myapp/releases/20160821142536 && ( export RBENV_ROOT="/usr/local/rbenv" RBENV_VERSION="2.3.1" ; /usr/local/rbenv/bin/rbenv exec bundle install --path /var/www/myapp/shared/bundle --without development test --deployment --quiet )
 DEBUG [8c7ee5b1]       /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `expand_path': Insecure operation - expand_path (SecurityError)
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `block in which'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `each'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `find'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `which'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:377:in `git_present?'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/source/git/git_proxy.rb:54:in `initialize'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:78:in `new'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:78:in `git_version'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:22:in `report'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:74:in `request_issue_report_for'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:40:in `log_error'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:100:in `rescue in with_friendly_errors'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:98:in `with_friendly_errors'
        from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/exe/bundle:19:in `<top (required)>'
        from /usr/local/rbenv/versions/2.3.1/bin/bundle:23:in `load'
        from /usr/local/rbenv/versions/2.3.1/bin/bundle:23:in `<main>'
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy_user@IP_address: bundle exit status: 1
bundle stdout: /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `expand_path': Insecure operation - expand_path (SecurityError)  
       ↑↓ //上のエラーのパスと同じ （from/~の内容）
bundle stderr: Nothing written

Tasks: TOP => deploy:updated => bundler:install
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as deploy_user@IP_address: bundle exit status: 1
bundle stdout: /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `expand_path': Insecure operation - expand_path (SecurityError)
       ↑↓ //上のエラーのパスと同じ （from/~の内容）
bundle stderr: Nothing written
Admin-Mac:myapp admin$ 

###deploy.rb

set :application, 'myapp'
set :repo_url, '[e-mail]:myapp/myapp.git'
set :puma_threads,    [4, 5]
set :puma_workers,    1
set :rbenv_ruby, '2.3.1'
set :rbenv_path, '/usr/local/rbenv'
set :pty,             true
set :use_sudo,        false
set :stage,           :production
set :deploy_via,      :remote_cache
set :deploy_to,       '/var/www/myapp'
set :puma_bind,       "unix://#{shared_path}/tmp/sockets/puma.sock"
set :puma_state,      "#{shared_path}/tmp/pids/puma.state"
set :puma_pid,        "#{shared_path}/tmp/pids/puma.pid"
set :puma_access_log, "#{release_path}/log/puma.error.log"
set :puma_error_log,  "#{release_path}/log/puma.access.log"
set :puma_preload_app, true
set :puma_worker_timeout, nil
set :puma_init_active_record, true  # Change to false when not using ActiveRecord

## Defaults:
set :scm,           :git
set :branch,        :master
set :format,        :pretty
set :log_level,     :debug
set :keep_releases, 6

## Linked Files & Directories (Default None):
set :linked_files, %w{config/database.yml config/secrets.yml}
set :linked_dirs,  %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

namespace :deploy do

  desc 'Initial Deploy'
  task :initial do
    on roles(:app) do
      before 'deploy:restart', 'puma:start'
      invoke 'deploy'
    end
  end

  before :starting,     :check_revision
  after  :finishing,    :compile_assets
  after  :finishing,    :cleanup
  after  :finishing,    :restart
end

###試してみたこと

[deploy_user@ik1-325-22 ~]$ rbenv version
2.3.1 (set by /usr/local/rbenv/version)

[deploy_user@ik1-325-22 ~]$ bundle version
/usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `expand_path': Insecure operation - expand_path (SecurityError)
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:310:in `block in which'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `each'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `find'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:308:in `which'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler.rb:377:in `git_present?'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/source/git/git_proxy.rb:54:in `initialize'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:78:in `new'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:78:in `git_version'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/env.rb:22:in `report'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:74:in `request_issue_report_for'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:40:in `log_error'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:100:in `rescue in with_friendly_errors'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:98:in `with_friendly_errors'
	from /usr/local/rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.12.5/exe/bundle:19:in `<top (required)>'
	from /usr/local/rbenv/versions/2.3.1/bin/bundle:23:in `load'
	from /usr/local/rbenv/versions/2.3.1/bin/bundle:23:in `<main>'

[deploy_user@ik1-325-22 ~]$ sudo bundle version
Bundler version 1.12.5

以上の内容からsudoをつければいけるのかと思い、deploy.rbにset :rbenv_prefix, "sudo rbenv exec”を追記して実行しましたが、下記のエラー内容...

.
.冒頭のログとほぼ同じため省略しています。
.
 INFO [5c9a0279] Running sudo rbenv exec bundle install --path /var/www/myapp/shared/bundle --without development test --deployment --quiet as deploy_user@IP_address
 DEBUG [5c9a0279] Command: cd /var/www/myapp/releases/20160821145425 && ( export RBENV_ROOT="/usr/local/rbenv" RBENV_VERSION="2.3.1" ; sudo rbenv exec bundle install --path /var/www/myapp/shared/bundle --without development test --deployment --quiet )
 DEBUG [5c9a0279]       An error occurred while installing nio4r (1.2.1), and Bundler cannot continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy_user@IP_address: bundle exit status: 5
bundle stdout: An error occurred while installing nio4r (1.2.1), and Bundler cannot continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.
bundle stderr: Nothing written

Tasks: TOP => deploy:updated => bundler:install
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as deploy_user@IP_address: bundle exit status: 5
bundle stdout: An error occurred while installing nio4r (1.2.1), and Bundler cannot continue.
Make sure that `gem install nio4r -v '1.2.1'` succeeds before bundling.
bundle stderr: Nothing written

###環境
サーバーOS： CentOS6.8
Ruby: 2.3.1
Ruby On Rails: 5.0.0
１つのサーバーにnginx+puma+Railsアプリケーション
リストrbenvを下記のサイトを参考にAnsibleにてシステムワイドにインストールをして実行しています。
http://ria10.hatenablog.com/entry/2015/04/14/132129

かなりはまってしまい自分では解決できそうになかったので投稿させていただきました。どうかよろしくお願いします。

Answer 1

deploy 先のサーバ上で以下のコマンドを実行するとどうなるのでしょうか？

$ cd /var/www/myapp/releases/20160821142536 &&
 ( export RBENV_ROOT="/usr/local/rbenv" RBENV_VERSION="2.3.1" ;
   /usr/local/rbenv/bin/rbenv exec bundle install --path
    /var/www/myapp/shared/bundle --without development test --deployment --quiet )

※ 適当に折り返してます。

$SAFE、なんて指定しないですよね… 何が起こってるんでしょうね？