[Rails4] 解決mina deploy後，圖片會清空問題

每次重新部署，public裡面的圖片好像會清空，怎辦？

將public/uploads加入:shared_paths的清單內：

set :shared_paths, ['config/database.yml', 'log', 'config/config.yml', 'config/secrets.yml', 'public/uploads']

再將以下程式碼加入到:environment

queue! %[mkdir -p "#{deploy_to}/shared/public/uploads"]
queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/public/uploads"]

但如果要手動清空 /public的資料

task :clean do
  queue! %[cd "#{deploy_to}/shared/public/uploads"]
  queue 'rm -rf *'
end

然後下指令 mina clean就可以手動清空。

以下是完整版本：

require 'mina/bundler'
require 'mina/rails'
require 'mina/git'
require 'mina/rbenv'  # for rbenv support. (http://rbenv.org)

set :domain, 'information.coolsea.net'
set :deploy_to, '/home/apps/my_project/information'
set :repository, 'git@github.com:coolsea/information.git'
set :branch, 'master'

# Manually create these paths in shared/ (eg: shared/config/database.yml) in your server.
# They will be linked in the 'deploy:link_shared_paths' step.
set :shared_paths, ['config/database.yml', 'log', 'config/config.yml', 'config/secrets.yml', 'public/uploads']

# Optional settings:
   set :user, 'apps'    # Username in the server to SSH to.

task :environment do
  # If you're using rbenv, use this to load the rbenv environment.
  # Be sure to commit your .rbenv-version to your repository.
    invoke :'rbenv:load'

  # For those using RVM, use this to load an RVM version@gemset.
  # invoke :'rvm:use[ruby-1.9.3-p125@default]'
end

##########################################################################
#
# Create new host tasks
# Tasks below are related to deploying a new version of the application
#
##########################################################################

# Function extracted from http://blog.nicolai86.eu/posts/2013-05-06/syncing-database-content-down-with-mina
# allowing to read the content of the database.yml file
RYAML = <<-BASH
function ryaml {
  ruby -ryaml -e 'puts ARGV[1..-1].inject(YAML.load(File.read(ARGV[0]))) {|acc, key| acc[key] }' "$@"
};
BASH




# Put any custom mkdir's in here for when `mina setup` is ran.
# For Rails apps, we'll make some of the shared paths that are shared between
# all releases.
task :setup => :environment do
  queue! %[mkdir -p "#{deploy_to}/shared/log"]
  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/log"]

  queue! %[mkdir -p "#{deploy_to}/shared/config"]
  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/config"]

  queue! %[mkdir -p "#{deploy_to}/shared/public/uploads"]
  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/public/uploads"]

  queue! %[touch "#{deploy_to}/shared/config/database.yml"]
  queue  %[echo "-----> Be sure to edit 'shared/config/database.yml'."]
  invoke :'setup:db:database_yml'
end



# Populate file database.yml with the appropriate rails_env
# Database name and user name are based on convention
# Password is defined by the user during setup
desc "Populate database.yml"
task :'setup:db:database_yml' => :environment do
  puts "Enter a name for the new database"
  db_name = STDIN.gets.chomp
  puts "Enter a user for the new database"
  db_username = STDIN.gets.chomp
  puts "Enter a password for the new database"
  db_pass = STDIN.gets.chomp
  # Virtual Host configuration file
  database_yml = <<-DATABASE.dedent
    #{rails_env}:
      adapter: mysql2
      encoding: utf8
      database: #{db_name}
      username: #{db_username}
      password: #{db_pass}
      host: localhost
      timeout: 5000
  DATABASE
  queue! %{
    echo "-----> Populating database.yml"
    echo "#{database_yml}" > #{deploy_to!}/shared/config/database.yml
    echo "-----> Done"
  }
  invoke :'setup:db'

end

# Create the new database based on information from database.yml
# In this application DB, user is given full access to the new DB
desc "Create new database"
task :'setup:db' => :environment do
  queue! %{
    echo "-----> Import RYAML function"
    #{RYAML}
    echo "-----> Read database.yml"
    USERNAME=$(ryaml #{deploy_to!}/#{shared_path!}/config/database.yml #{rails_env} username)
    PASSWORD=$(ryaml #{deploy_to!}/#{shared_path!}/config/database.yml #{rails_env} password)
    DATABASE=$(ryaml #{deploy_to!}/#{shared_path!}/config/database.yml #{rails_env} database)
    echo "-----> Create SQL query"
    Q1="CREATE DATABASE IF NOT EXISTS $DATABASE;"
    Q2="GRANT USAGE ON *.* TO $USERNAME@localhost IDENTIFIED BY '$PASSWORD';"
    Q3="GRANT ALL PRIVILEGES ON $DATABASE.* TO $USERNAME@localhost;"
    Q4="FLUSH PRIVILEGES;"
    SQL="${Q1}${Q2}${Q3}${Q4}"
    echo "-----> Execute SQL query to create DB and user"
    echo "-----> Enter MySQL root password on prompt below"
    #{echo_cmd %[mysql -uroot -p -e "$SQL"]}
    echo "-----> Done"
  }
end

desc "Deploys the current version to the server."
task :deploy => :environment do
  deploy do
    # Put things that will set up an empty directory into a fully set-up
    # instance of your project.
    invoke :'git:clone'
    invoke :'deploy:link_shared_paths'
    invoke :'bundle:install'
    invoke :'rails:db_migrate'
    invoke :'rails:assets_precompile'
  end
end


task :restart do
  queue 'sudo service nginx restart'
end

task :clean do
  queue! %[cd "#{deploy_to}/shared/public/uploads"]
  queue 'rm -rf *'
end

#########################################################################
#
# Libraries
#
##########################################################################

#
# See https://github.com/cespare/ruby-dedent/blob/master/lib/dedent.rb
#
class String
  def dedent
    lines = split "\n"
    return self if lines.empty?
    indents = lines.map do |line|
      line =~ /\S/ ? (line.start_with?(" ") ? line.match(/^ +/).offset(0)[1] : 0) : nil
    end
    min_indent = indents.compact.min
    return self if min_indent.zero?
    lines.map { |line| line =~ /\S/ ? line.gsub(/^ {#{min_indent}}/, "") : line }.join "\n"
  end
end