initial commit

.gitignore

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+pkg/*
+*.gem
+.bundle

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in rails_db_dump.gemspec
+gemspec

Rakefile

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+require 'bundler'
+Bundler::GemHelper.install_tasks

lib/rails_db_dump.rb

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+module RailsDbDump
+  # Your code goes here...
+end

lib/rails_db_dump/version.rb

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+module RailsDbDump
+  VERSION = "0.0.1"
+end

rails_db_dump.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "rails_db_dump/version"
+
+Gem::Specification.new do |s|
+  s.name        = "rails_db_dump"
+  s.version     = RailsDbDump::VERSION
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Leonid Shevtsov"]
+  s.email       = ["leonid@shevtsov.me"]
+  s.homepage    = "https://github.com/leonid-shevtsov/rails_db_dump"
+  s.summary     = %q{dump your Rails database with a simple rake task}
+  s.description = %q{rails_db_dump is a wrapper for the native dumper of whatever database engine you're using, taking access parameters from database.yml. Supports mysql, postgresql and sqlite at the moment.}
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+end

tasks/rails_db_dump.rake

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+namespace :db do
+  task :dump do
+    require 'yaml'
+    config = YAML.load_file(File.join(Rails.root,'config','database.yml'))[Rails.env]
+    case config["adapter"]
+    when /^mysql/
+      args = {
+        'host'      => '--host',
+        'port'      => '--port',
+        'socket'    => '--socket',
+        'username'  => '--user',
+        'encoding'  => '--default-character-set',
+        'password'  => '--password'
+      }.map { |opt, arg| "#{arg}=#{config[opt]}" if config[opt] }.compact
+      args << config['database']
+
+      exec('mysqldump', *args)
+
+    when "postgresql"
+      ENV['PGUSER']     = config["username"] if config["username"]
+      ENV['PGHOST']     = config["host"] if config["host"]
+      ENV['PGPORT']     = config["port"].to_s if config["port"]
+      ENV['PGPASSWORD'] = config["password"].to_s if config["password"]
+      exec('pg_dump', config["database"])
+
+    when "sqlite"
+      exec('sqlite', config["database"], '.dump')
+
+    when "sqlite3"
+      exec('sqlite3', config['database'], '.dump')
+
+    else
+      abort "Don't know how to dump #{config['database']}."
+    end
+  end
+end