投稿者: takatoh

新しく作ろうとしているプロジェクトで使うライブラリがあって、しかも2つのプロジェクトで共通に使うつもりなので、こういう場合は gem にしてしまうのがいい。filestorage っていう一般名詞みたいな名前のライブラリだけど gem search してみたら見つからなかったので、いいや、作ってしまえ。
というわけで、ほんとにシンプルなものだけど gem を作って rubygems.org に登録してみた。以下手順のメモ。

Bundlerでプロジェクトを作る

^o^ > bundle gem filestorage
DL is deprecated, please use Fiddle
      create  filestorage/Gemfile
      create  filestorage/Rakefile
      create  filestorage/LICENSE.txt
      create  filestorage/README.md
      create  filestorage/.gitignore
      create  filestorage/filestorage.gemspec
      create  filestorage/lib/filestorage.rb
      create  filestorage/lib/filestorage/version.rb
Initializing git repo in C:/Users/hiro/Documents/tmp/filestorage
warning: LF will be replaced by CRLF in .gitignore.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in Gemfile.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in LICENSE.txt.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in README.md.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in Rakefile.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in filestorage.gemspec.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in lib/filestorage.rb.
The file will have its original line endings in your working directory.
warning: LF will be replaced by CRLF in lib/filestorage/version.rb.
The file will have its original line endings in your working directory.

これで gem の雛形ができる。git リポジトリもできていて、ファイルがステージされた状態になっている。まずはここでいったん commit。ライブラリの本体（lib/filestorage/local_filestorage.rb）を書いて、filestorage.gemspec を編集してもう一度 commit。GitHub にリポジトリを作って push しておく。
これでひとまずは出来上がり（まあ、バージョン 0.0.1 だからね）。

rubygems.orgからAPI Keyをとってくる

rubygems.org に gem を登録するには、API Key が必要。サインアップしてあったので（いつやったんだっけ？）、プロファイルの編集ページで API Key を見ることができる。これを %HOME%/.gems/credentials ファイルに保存するんだけど、ワンライナーがページに載っているのでそれを真似して保存した。ただし、載っているのは Unix 向けなので、Windows ではそのまま使えるわけじゃない。とはいってもやってることは簡単で、次のようにすればいい。

^o^ > curl -u takatoh https://rubygems.org/api/v1/api_key.yaml > %HOME%/.gem/credentials

gemをつくって登録する

もう一息だ。まずは gem を作る。

^o^ > bundle exec rake build
DL is deprecated, please use Fiddle
DL is deprecated, please use Fiddle
filestorage 0.0.1 built to pkg/filestorage-0.0.1.gem.

これで pkg ディレクトリの中に filestorage-0.0.1.gem ができた。これを rubygems.org に登録する。

^o^ > bundle exec rake release
DL is deprecated, please use Fiddle
DL is deprecated, please use Fiddle
filestorage 0.0.1 built to pkg/filestorage-0.0.1.gem.
Tagged v0.0.1.
Pushed git commits and tags.
Pushed filestorage 0.0.1 to rubygems.org.

これだけで OK。なんか git のタグをうって GitHub に push までしてくれるみたいだな。

そんでもって、これが登録後のページ。おお、ちゃんと登録されてる！

追記

たいしたもんじゃないけど、書いたコードをさらしておく。

# encoding: utf-8

require 'pathname'
require 'fileutils'

module Filestorage

  class LocalFilestorage

    def initialize(base_dir)
      @base_dir = Pathname.new(base_dir)
    end

    def store(path, file)
      fullpath = @base_dir + path
      FileUtils.mkdir_p(fullpath.parent)
      if file.instance_of?(Pathname)
        FileUtils.cp(file, fullpath)
      elsif file.instance_of?(File)
        File.open(fullpath, "wb") do |f|
          f.write(file.read)
        end
      else
        File.open(fullpath, "wb") do |f|
          f.write(file)
        end
      end
      path
    end

    def get(path)
      fullpath = @base_dir + path
      File.open(fullpath, "rb")
    end

  end # of class LocalFilestorage

end # of module LocalFilestorage

なんか、1時間くらい経ってからページをみたら 18 downloads とか書いてある。もう 18 回もダウンロードされたってこと？みんながっかりしただろうな。

さらに追記

参考にしたページを書くのを忘れてた。ここを参考にしました。

　cf. RubyGems.org へ gem を公開する。 – komiyakの通り道

今日は Rails だ。試しに簡単な Web アプリを作ってみるよ。蔵書を管理するアプリにしよう。名前は Librarian だ。
と、意気込んだところだけど、結果から言うをうまくいかなかった。以下その顛末。

まずは Rails のプロジェクトを作る。

^o^ > rails new Librarian

このコマンドでずら～っとファイル一式が生成される。とりあえずはこれで git のリポジトリを作って最初のコミット。

^o^ > cd Librarian

^o^ > git init
Initialized empty Git repository in C:/Users/hiro/Documents/w/Librarian/.git/

^o^ > git add .
warning: LF will be replaced by CRLF in .gitignore.
The file will have its original line endings in your working directory.
（以下略）

^o^ > git commit -m "First commit."
[master (root-commit) 167a985] First commit.
warning: LF will be replaced by CRLF in .gitignore.
The file will have its original line endings in your working directory.
（以下略）

で、次は scaffold。

^o^ > ruby bin/rails generate scaffold book title volume author
DL is deprecated, please use Fiddle
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:1
82:in `rescue in create_default_data_source': No source of timezone data could b
e found. (TZInfo::DataSourceNotFound)
Please refer to http://tzinfo.github.io/datasourcenotfound for help resolving th
is error.
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:179:in `create_default_data_source'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:40:in `block in get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:39:in `synchronize'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:39:in `get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:629:in `data_source'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:92:in `get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone_proxy.rb:67:in `real_timezone'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone_proxy.rb:30:in `period_for_utc'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:549:in `current_period'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/object/try.rb:45:in `public_send'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/object/try.rb:45:in `try'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:223:in `utc_offset'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `block in []'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `tap'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `[]'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/time/zones.rb:60:in `find_zone!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/railtie.rb:20:in `block in '
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:30:in `instance_exec'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:30:in `run'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:55:in `block in run_initializers'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'

        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in
each_strongly_connected_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connec
ted_component_from'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strong
ly_connected_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:180:in `each'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connec
ted_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:54:in `run_initializers'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:288:in `initialize!'
        from C:/Users/hiro/Documents/w/Librarian/config/environment.rb:5:in `'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:264:in `require'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:264:in `require_environment!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:147:in `require_application_and_environment!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:133:in `generate_or_destroy'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:51:in `generate'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:40:in `run_command!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands.rb:17:in `'
        from bin/rails:4:in `require'
        from bin/rails:4:in `
'

なんかエラーが出た。どうやら timezone のデータが見つからない、といっているらしい。ついでに（親切にも）http://tzinfo.github.io/datasourcenotfound を見ればいいよ、とも。
早速ページにアクセスしてみる。すると、あった、Gemfile にちょっと記述を追加すればいいらしい。

If you are using a 64-bit version of Ruby on Windows, then add :x64_mingw to the list of platforms as follows:

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]

指示通り、Gemfile に :x64_mingw を追記して、buldle install を実行。

^o^ > ruby bin/bundle install
DL is deprecated, please use Fiddle
Using rake 10.3.2
Using i18n 0.6.9
Using json 1.8.1
Using minitest 5.3.5
Using thread_safe 0.3.4
Using tzinfo 1.2.1
Using activesupport 4.1.1
Using builder 3.2.2
Using erubis 2.7.0
Using actionview 4.1.1
Using rack 1.5.2
Using rack-test 0.6.2
Using actionpack 4.1.1
Using mime-types 1.25.1
Using polyglot 0.3.5
Using treetop 1.4.15
Using mail 2.5.4
Using actionmailer 4.1.1
Using activemodel 4.1.1
Using arel 5.0.1.20140414130214
Using activerecord 4.1.1
Using coffee-script-source 1.7.0
Using execjs 2.2.1
Using coffee-script 2.2.0
Using thor 0.19.1
Using railties 4.1.1
Using coffee-rails 4.0.1
Using hike 1.2.3
Using multi_json 1.10.1
Using jbuilder 2.1.1
Using jquery-rails 3.1.1
Using bundler 1.6.3
Using tilt 1.4.1
Using sprockets 2.11.0
Using sprockets-rails 2.1.3
Using rails 4.1.1
Using rdoc 4.1.1
Using sass 3.2.19
Using sass-rails 4.0.3
Using sdoc 0.4.0
Using sqlite3 1.3.9
Using turbolinks 2.2.2
Using uglifier 2.5.1
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed.

だけどなんだかちゃんとインストールされたような気配がない。試しにもう一度 scaffold をやってみる。

^o^ > ruby bin/rails generate scaffold book title volume author
DL is deprecated, please use Fiddle
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:1
82:in `rescue in create_default_data_source': No source of timezone data could b
e found. (TZInfo::DataSourceNotFound)
Please refer to http://tzinfo.github.io/datasourcenotfound for help resolving th
is error.
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:179:in `create_default_data_source'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:40:in `block in get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:39:in `synchronize'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/dat
a_source.rb:39:in `get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:629:in `data_source'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:92:in `get'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone_proxy.rb:67:in `real_timezone'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone_proxy.rb:30:in `period_for_utc'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/tim
ezone.rb:549:in `current_period'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/object/try.rb:45:in `public_send'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/object/try.rb:45:in `try'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:223:in `utc_offset'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `block in []'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `tap'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/values/time_zone.rb:396:in `[]'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/core_ext/time/zones.rb:60:in `find_zone!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/activesupport-4.1.1/lib/act
ive_support/railtie.rb:20:in `block in '
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:30:in `instance_exec'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:30:in `run'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:55:in `block in run_initializers'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'

        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in
each_strongly_connected_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connec
ted_component_from'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strong
ly_connected_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:180:in `each'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connec
ted_component'
        from C:/Ruby200-x64/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/in
itializable.rb:54:in `run_initializers'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:288:in `initialize!'
        from C:/Users/hiro/Documents/w/Librarian/config/environment.rb:5:in `'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:264:in `require'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/ap
plication.rb:264:in `require_environment!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:147:in `require_application_and_environment!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:133:in `generate_or_destroy'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:51:in `generate'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands/commands_tasks.rb:40:in `run_command!'
        from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.1/lib/rails/co
mmands.rb:17:in `'
        from bin/rails:4:in `require'
        from bin/rails:4:in `
'

やっぱり同じじゃないか。
仕方がないから、tzinfo-data っていう gem を直接インストールする。

^o^ > gem install tzinfo-data
Fetching: tzinfo-data-1.2014.5.gem (100%)
Successfully installed tzinfo-data-1.2014.5
Parsing documentation for tzinfo-data-1.2014.5
Installing ri documentation for tzinfo-data-1.2014.5
Done installing documentation for tzinfo-data after 3 seconds
1 gem installed

よし、インストールできた。これで大丈夫だろう。

^o^ > ruby bin/rails generate scaffold book title volume author
DL is deprecated, please use Fiddle
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/tzinfo-1.2.1/lib/tzinfo/data_source.rb:1
82:in `rescue in create_default_data_source': No source of timezone data could b
e found. (TZInfo::DataSourceNotFound)
Please refer to http://tzinfo.github.io/datasourcenotfound for help resolving th
is error.
（以下略）

だめだ～！ちゃんと tzinfo-data はインストールできてるのに何で見つからないんだ。

もしかして Ruby 2.0.0 と Rails 4.1.1 って相性が悪いのか？

追記(2014/07/01)

昨日ダメだった Rails だけど、今日会社の PC （Windows7 32bit、Ruby 2.0.0 32bit）でこっそりやってみたらあっさりとうまくいってしまった。64bit版がダメだってこと？

こないだ Heroku を使ってみて成功したので、今度は Rails でやってみようかと、「HerokuではじめるRailsプログラミング入門」という本を読んだ。
「Herokuではじめる」とは書いてあるけど、Heroku についてはほんのちょっとしか書いてなくて、基本的に Ruby on Rails の入門書。それも Rails3 準拠のようで、最新の Rails を使うにはもうちょっと足りない、という感じ。
とはいえ、Rails は何年も前（たしかバージョンが 2.0.2 だったかな）に使ったきりほとんど忘れていたので、どんな感じかを思い出すのにはちょうどよかった。
もう少し Rails4 の本を読んで、この2年ほど動いていない Rails アプリを作り直そう。