Bundler経由でインストールしたMiddlemanコマンドが効かない

Question

前提・実現したいこと

何が原因か分からないのでタグは的外れかもしれないです。MiddlemanというGemをインストールして、Middlemanの説明書を読んで「bundle exec middleman init」や「sudo bundle exec middleman init」としても実行できません。何が原因と考えられるでしょうか。ご教授願います。

発生している問題・エラーメッセージ

vpsuser@ip-add-re-ss:~$ bundle exec middleman init
bundler: failed to load command: middleman (/home/vpsuser/.rbenv/versions/2.6.3/bin/middleman)
ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:ExecJS>'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `<top (required)>'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/coffee-script-2.4.1/lib/coffee_script.rb:1:in `require'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/coffee-script-2.4.1/lib/coffee_script.rb:1:in `<top (required)>'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/renderers/coffee_script.rb:2:in `require'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/renderers/coffee_script.rb:2:in `<top (required)>'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/core_extensions/rendering.rb:11:in `require'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/core_extensions/rendering.rb:11:in `block in <top (required)>'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/extensions.rb:91:in `load'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/extensions.rb:127:in `block in load_settings'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/extensions.rb:125:in `each'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/extensions.rb:125:in `load_settings'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/extension_manager.rb:12:in `initialize'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/application.rb:263:in `new'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-core-4.3.4/lib/middleman-core/application.rb:263:in `initialize'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-cli-4.3.4/bin/middleman:49:in `new'
  /home/vpsuser/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/middleman-cli-4.3.4/bin/middleman:49:in `<top (required)>'
  /home/vpsuser/.rbenv/versions/2.6.3/bin/middleman:23:in `load'
  /home/vpsuser/.rbenv/versions/2.6.3/bin/middleman:23:in `<top (required)>'

vpsuser@ip-add-re-ss:~$ sudo bundle exec middleman init
Traceback (most recent call last):
	2: from /usr/local/bin/bundle:23:in `<main>'
	1: from /usr/lib/ruby/2.5.0/rubygems.rb:308:in `activate_bin_path'
/usr/lib/ruby/2.5.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException)

該当のソースコード

vpsuser@ip-add-re-ss:~$ cat Gemfile
# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

# gem "rails"
gem 'haml', '~> 5.1', '>= 5.1.1'
gem 'sinatra', '~> 2.0', '>= 2.0.5'
gem 'sinatra-contrib', '~> 2.0', '>= 2.0.5'
gem 'sqlite3', '~> 1.4', '>= 1.4.1'
gem 'nokogiri', '~> 1.10', '>= 1.10.3'
gem 'sequel', '~> 5.22'
gem 'unicorn', '~> 5.5', '>= 5.5.1'
gem 'open_uri_redirections', '~> 0.2.1'
gem 'redcarpet', '~> 3.4'
gem 'middleman', '~> 4.3', '>= 4.3.4'

$ cat Gemfile.lock 
GEM
  remote: https://rubygems.org/
  specs:
    activesupport (5.0.7.2)
      concurrent-ruby (~> 1.0, >= 1.0.2)
      i18n (>= 0.7, < 2)
      minitest (~> 5.1)
      tzinfo (~> 1.1)
    addressable (2.6.0)
      public_suffix (>= 2.0.2, < 4.0)
    backports (3.15.0)
    coffee-script (2.4.1)
      coffee-script-source
      execjs
    coffee-script-source (1.12.2)
    concurrent-ruby (1.1.5)
    contracts (0.13.0)
    dotenv (2.7.4)
    erubis (2.7.0)
    execjs (2.7.0)
    fast_blank (1.0.0)
    fastimage (2.1.5)
    ffi (1.11.1)
    haml (5.1.1)
      temple (>= 0.8.0)
      tilt
    hamster (3.0.0)
      concurrent-ruby (~> 1.0)
    hashie (3.6.0)
    i18n (0.9.5)
      concurrent-ruby (~> 1.0)
    kgio (2.11.2)
    kramdown (1.17.0)
    listen (3.0.8)
      rb-fsevent (~> 0.9, >= 0.9.4)
      rb-inotify (~> 0.9, >= 0.9.7)
    memoist (0.16.0)
    middleman (4.3.4)
      coffee-script (~> 2.2)
      haml (>= 4.0.5)
      kramdown (~> 1.2)
      middleman-cli (= 4.3.4)
      middleman-core (= 4.3.4)
    middleman-cli (4.3.4)
      thor (>= 0.17.0, < 2.0)
    middleman-core (4.3.4)
      activesupport (>= 4.2, < 5.1)
      addressable (~> 2.3)
      backports (~> 3.6)
      bundler
      contracts (~> 0.13.0)
      dotenv
      erubis
      execjs (~> 2.0)
      fast_blank
      fastimage (~> 2.0)
      hamster (~> 3.0)
      hashie (~> 3.4)
      i18n (~> 0.9.0)
      listen (~> 3.0.0)
      memoist (~> 0.14)
      padrino-helpers (~> 0.13.0)
      parallel
      rack (>= 1.4.5, < 3)
      sassc (~> 2.0)
      servolux
      tilt (~> 2.0.9)
      uglifier (~> 3.0)
    mini_portile2 (2.4.0)
    minitest (5.11.3)
    multi_json (1.13.1)
    mustermann (1.0.3)
    nokogiri (1.10.3)
      mini_portile2 (~> 2.4.0)
    open_uri_redirections (0.2.1)
    padrino-helpers (0.13.3.4)
      i18n (~> 0.6, >= 0.6.7)
      padrino-support (= 0.13.3.4)
      tilt (>= 1.4.1, < 3)
    padrino-support (0.13.3.4)
      activesupport (>= 3.1)
    parallel (1.17.0)
    public_suffix (3.1.1)
    rack (2.0.7)
    rack-protection (2.0.5)
      rack
    raindrops (0.19.0)
    rake (12.3.3)
    rb-fsevent (0.10.3)
    rb-inotify (0.10.0)
      ffi (~> 1.0)
    redcarpet (3.5.0)
    sassc (2.0.1)
      ffi (~> 1.9)
      rake
    sequel (5.22.0)
    servolux (0.13.0)
    sinatra (2.0.5)
      mustermann (~> 1.0)
      rack (~> 2.0)
      rack-protection (= 2.0.5)
      tilt (~> 2.0)
    sinatra-contrib (2.0.5)
      backports (>= 2.8.2)
      multi_json
      mustermann (~> 1.0)
      rack-protection (= 2.0.5)
      sinatra (= 2.0.5)
      tilt (>= 1.3, < 3)
    sqlite3 (1.4.1)
    temple (0.8.1)
    thor (0.20.3)
    thread_safe (0.3.6)
    tilt (2.0.9)
    tzinfo (1.2.5)
      thread_safe (~> 0.1)
    uglifier (3.2.0)
      execjs (>= 0.3.0, < 3)
    unicorn (5.5.1)
      kgio (~> 2.6)
      raindrops (~> 0.7)

PLATFORMS
  ruby

DEPENDENCIES
  haml (~> 5.1, >= 5.1.1)
  middleman (~> 4.3, >= 4.3.4)
  nokogiri (~> 1.10, >= 1.10.3)
  open_uri_redirections (~> 0.2.1)
  redcarpet (~> 3.4)
  sequel (~> 5.22)
  sinatra (~> 2.0, >= 2.0.5)
  sinatra-contrib (~> 2.0, >= 2.0.5)
  sqlite3 (~> 1.4, >= 1.4.1)
  unicorn (~> 5.5, >= 5.5.1)

BUNDLED WITH
   1.17.2

補足情報（FW/ツールのバージョンなど）

$ bundle -v
Bundler version 1.17.2
$ rbenv -v
rbenv 1.1.2-2-g4e92322
$ rbenv versions
  system
* 2.6.3 (set by /home/vpsuser/.rbenv/version)

Answer 1

ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.

とのことなので、GemfileになんらかのJavascript Runtimeを追加するなり(例: gem 'duktape')
node.jsをインストールするなり
ご自由にどうぞ

個人的にはnode.jsをインストールするのが無難だと思っております。

• セキュリティ面等での問題が発生した事が調べやすい
• アップデートする場合も普通にnodeをアップデートするだけなので問題になりにくい

Comments

[decatail]

大変ありがとうございました。公式サイトにも検索しても解決法が見当たらなかったので助かりました。